Patent Publication Number: US-9887656-B2

Title: Information processing device, information storage device, and control device of rotary electric machine

Description:
TECHNICAL FIELD 
     The present invention relates to an information processing device that calculates a current command value of a rotary electric machine, an information storage device that stores a current command value of a rotary electric machine, and a control device that controls a current of a rotary electric machine. 
     BACKGROUND ART 
     A control device of a rotary electric machine according to the below-described Patent Document 1 comprises a first rotor in which a winding is provided and which is mechanically connected to an engine, a second rotor in which a permanent magnet which is electromagnetically coupled with the winding of the first rotor is provided and which is mechanically connected to a drive shaft, a stator in which a winding which is electromagnetically coupled to the permanent magnet of the second rotor is provided, a slip ring which is electrically connected to the winding of the first rotor, a brush which electrically contacts the slip ring, a first inverter which applies a control to allow transmission and reception of electric power between a battery and the winding of the stator, and a second inverter which applies a control to allow transmission and reception of electric power between the battery and the winding of the first rotor through the slip ring and the brush. In Patent Document 1, because a motive power from the engine transmitted to the first rotor is transmitted to the second rotor by the electromagnetic coupling of the winding of the first rotor and the permanent magnet of the second rotor, the drive shaft can be driven by the motive power of the engine. During this process, the current in the winding of the first rotor may be controlled by a switching control of the second inverter, to control a torque acting between the first rotor and the second rotor. In addition, the drive shaft can also be driven by generating a motive power in the second rotor using electric power supplied through the first inverter to the winding of the stator by the electromagnetic coupling between the winding of the stator and the permanent magnet of the second rotor. In this process, the current in the winding of the stator may be controlled by a switching control of the first inverter, to control a torque acting between the stator and the second rotor. 
     RELATED ART REFERENCES 
     Patent Documents 
     [Patent Document 1] JP 2000-50585 A 
     [Patent Document 2] JP 2011-205741 A 
     [Patent Document 3] JP 2009-33917 A 
     [Patent Document 4] JP 2009-73472 A 
     [Patent Document 5] JP 2009-274536 A 
     SUMMARY OF INVENTION 
     Technical Problem 
     In Patent Document 1, the current in the winding of the first rotor is controlled based on a torque command value between the first rotor and the second rotor, and a copper loss of the winding of the first rotor changes according to the current in the winding of the first rotor. Similarly, the current in the winding of the stator is controlled based on a torque command value between the stator and the second rotor, and a copper loss of the winding of the stator changes according to the current in the winding of the stator. Because of this, depending on the torque command value between the first rotor and the second rotor and the torque command value between the stator and the second rotor, a total copper loss of the winding of the first rotor and the winding of the stator may be increased. 
     Moreover, when currents are simultaneously applied to the winding of the first rotor and the winding of the stator, a magnetic interference phenomenon occurs where the current in the winding of the first rotor affects the torque between the stator and the second rotor and the current in the winding of the stator affects the torque between the first rotor and the second rotor. Because the mutual torques change due to the magnetic interference, the current command value for applying an accurate control according to the torque command values cannot be determined. Even if the torque is controlled according to the torque command value, the total copper loss of the winding of the first rotor and the winding of the stator may not be the minimum. 
     One advantage of the present invention is that, in a rotary electric machine in which torque can act between a first rotor and a second rotor and between a stator and a second rotor, a current command value for reducing the loss due to the copper loss is calculated while controlling the torques according to the torque command values even under magnetic interference. Another advantage of the present invention is that, in the above-described rotary electric machine, the loss due to the copper loss is reduced while controlling the torques according to the torque command values even under magnetic interference. 
     Solution to Problem 
     In order to achieve at least a part of the advantages described above, an information processing device, an information storage device, and a control device of a rotary electric machine according to the present invention employ the following configurations. 
     According to one aspect of the present invention, there is provided an information processing device that calculates a current command value based on a torque command value of a rotary electric machine, wherein the rotary electric machine comprises a first rotor in which a rotor winding is provided, a stator in which a stator winding is provided, and a second rotor that opposes the first rotor and the stator and that is rotatable relative to the first rotor, a torque acts between the first rotor and the second rotor according to a magnetic flux due to a current in the rotor winding acting on the second rotor, and a torque acts between the stator and the second rotor according to a magnetic flux due to a current in the stator winding acting on the second rotor, a linkage magnetic flux of the stator winding can be adjusted by the current in the rotor winding and a linkage magnetic flux of the rotor winding can be adjusted by the current in the stator winding, the information processing device comprises a current command value calculating unit that calculates a current command value for the rotor winding and a current command value for the stator winding with respect to a torque command value between the first rotor and the second rotor and a torque command value between the stator and the second rotor, based on an evaluation function representing a total copper loss of the rotor winding and the stator winding and using a first magnetic interference model and a second magnetic interference model, the first magnetic interference model represents a relationship of the linkage magnetic flux of the rotor winding with respect to the current in the rotor winding and the current in the stator winding, and the second magnetic interference model represents a relationship of the linkage magnetic flux of the stator winding with respect to the current in the rotor winding and the current in the stator winding. 
     According to another aspect of the present invention, preferably, the first magnetic interference model and the second magnetic interference model include model equations related to a magnetomotive force, in which the current in the rotor winding and the current in the stator winding are combined with a setting ratio. 
     According to another aspect of the present invention, preferably, the setting ratio is 1:C, where C is a coefficient representing a degree of magnetic interference. 
     According to another aspect of the present invention, preferably, the first magnetic interference model and the second magnetic interference model further include model equations representing a degree of change of the linkage magnetic flux by magnetic saturation. 
     According to another aspect of the present invention, preferably, the first magnetic interference model and the second magnetic interference model have a model related to a d-axis linkage magnetic flux and a model related to a q-axis linkage magnetic flux. 
     According to another aspect of the present invention, preferably, the current command value calculating unit calculates the current command value for the rotor winding and the current command value for the stator winding based on the evaluation function and a constraint condition including a condition that a voltage of the rotor winding is less than or equal to a first limit value and a voltage of the stator winding is less than or equal to a second limit value, and using the first magnetic interference model and the second magnetic interference model. 
     According to another aspect of the present invention, preferably, electric power can be converted between an electricity storage device and the stator winding by a first electric power conversion device, electric power can be converted between the electricity storage device and the rotor winding by a second electric power conversion device, and the first limit value and the second limit value are set to values smaller than a voltage of the electricity storage device. 
     According to another aspect of the present invention, preferably, the current command value calculating unit calculates the current command value for the rotor winding and the current command value for the stator winding based on the evaluation function and a constraint condition including a condition that the current in the rotor winding is less than or equal to a third limit value and the current in the stator winding is less than or equal to a fourth limit value, and using the first magnetic interference model and the second magnetic interference model. 
     According to another aspect of the present invention, preferably, electric power can be converted between an electricity storage device and the stator winding by a first electric power conversion device, electric power can be converted between the electricity storage device and the rotor winding by a second electric power conversion device, the third limit value is set to a value smaller than a capacity of the second electric power conversion device, and the fourth limit value is set to a value smaller than a capacity of the first electric power conversion device. 
     According to another aspect of the present invention, preferably, the current command value calculating unit calculates the current command value for the rotor winding and the current command value for the stator winding such that the evaluation function is approximately minimum. 
     According to another aspect of the present invention, there is provided an information storage device that stores the current command value for the rotor winding and the current command value for the stator winding calculated by the information processing device according to the present invention in correspondence to the torque command value between the first rotor and the second rotor and the torque command value between the stator and the second rotor. 
     According to another aspect of the present invention, there is provided a control device of a rotary electric machine, that controls the current in the rotor winding and the current in the stator winding based on the current command value for the rotor winding and the current command value for the stator winding calculated by the information processing device according to the present invention. 
     Advantageous Effects of Invention 
     According to various aspects of the present invention, by calculating a current command value for a rotor winding and a current command value for a stator winding using a first magnetic interference model representing a relationship of a linkage magnetic flux of the rotor winding with respect to a current in the rotor winding and a current in the stator winding and a second magnetic interference model representing a relationship of a linkage magnetic flux of the stator winding with respect to the current in the rotor winding and the current in the stator winding and based on an evaluation function representing a total copper loss of the rotor winding and the stator winding, it is possible to calculate a current command value that reduces the loss due to the copper loss while controlling the torque between the first rotor and the second rotor and the torque between the stator and the second rotor according to the torque command values. Furthermore, by controlling the current in the rotor winding and the current in the stator winding based on the calculated current command values, it is possible to reduce the loss due to the copper loss of the rotary electric machine while controlling the torques according to the torque command values. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a diagram schematically showing a structure of a hybrid drive device having a control device of a rotary electric machine according to a preferred embodiment of the present invention. 
         FIG. 2  is a diagram showing an example structure of a rotary electric machine. 
         FIG. 3  is a diagram showing an example structure of a rotary electric machine. 
         FIG. 4  is a diagram showing an example structure of a rotary electric machine. 
         FIG. 5  is a diagram showing a flow of a d-axis magnetic flux when a d-axis current flows in a rotor winding. 
         FIG. 6  is a diagram showing a flow of a q-axis magnetic flux when a q-axis current flows in a rotor winding. 
         FIG. 7  is a diagram showing a flow of a d-axis magnetic flux when a d-axis current flows in a stator winding. 
         FIG. 8  is a diagram showing a flow of a q-axis magnetic flux when a q-axis current flows in a stator winding. 
         FIG. 9  is a diagram showing an example relationship of currents I in  and I out  for torques of T in =0 and T out =90 Nm. 
         FIG. 10  is a functional block diagram showing an example structure of an electronic control unit and an information processing device. 
         FIG. 11  is a flowchart showing an example process executed by an information processing device. 
         FIG. 12  is a diagram showing an example relationship of an evaluation function f with respect to a current I in  in a rotor winding. 
         FIG. 13  is a functional block diagram showing another example structure of an electronic control unit. 
         FIG. 14  is a diagram showing another example structure of a rotary electric machine. 
         FIG. 15  is a diagram showing another example structure of a rotary electric machine. 
         FIG. 16  is a diagram showing another example structure of a rotary electric machine. 
         FIG. 17  is a diagram showing another example structure of a rotary electric machine. 
         FIG. 18  is a diagram showing another example structure of a rotary electric machine. 
         FIG. 19  is a diagram showing another example structure of a rotary electric machine. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     A preferred embodiment of the present invention (hereinafter referred to as “embodiment”) will now be described with reference to the drawings. 
       FIGS. 1-4  are diagrams schematically showing a structure of a hybrid drive system having a control device of a rotary electric machine according to a preferred embodiment of the present invention.  FIG. 1  schematically shows an overall structure, and  FIGS. 2-4  schematically show the structure of a rotary electric machine  10 . The hybrid drive system of the present embodiment comprises an engine (internal combustion engine)  36  provided as a prime mover that can generate motive power (mechanical motive power), a transmission (mechanical transmission)  44  that can change a gear ratio provided between the engine  36  and a drive shaft  37  (a wheel  38 ), and the rotary electric machine  10  provided between the engine  36  and the transmission  44 , which can generate a motive power (mechanical motive power) and that can generate electric power. The hybrid drive system of the present embodiment can be used, for example, as a motive power output system for driving a vehicle. 
     The rotary electric machine  10  comprises a stator  16  fixed on a stator case (not shown), a first rotor  28  that can rotate relative to the stator  16 , and a second rotor  18  that opposes the stator  16  and the first rotor  28  with predetermined gaps therebetween in a radial direction orthogonal to a rotational axis of the rotor, and that can rotate relative to the stator  16  and the first rotor  28 . In the example configuration shown in  FIGS. 1-4 , the stator  16  is placed at a position on a radially outer side in relation to the first rotor  28  with a space from the first rotor  28 , and the second rotor  18  is placed at a position in the radial direction between the stator  16  and the first rotor  28 . In other words, the first rotor  28  is placed to oppose the second rotor  18  at a position radially inward with respect to the second rotor  18 , and the stator  16  is placed to oppose the second rotor  18  at a position radially outward in relation to the second rotor  18 . The first rotor  28  is mechanically connected to the engine  36 , so that the motive power from the engine  36  is transmitted to the first rotor  28 . Similarly, the second rotor  18  is mechanically connected to the drive shaft  37  through the transmission  44  so that the motive power from the second rotor  18  is gear-changed at the transmission  44  and transmitted to the drive shaft  37  (wheel  38 ). In the following description, the first rotor  28  is described as an input-side rotor, and the second rotor  18  is described as an output-side rotor. 
     The stator  16  includes a stator core  51  and stator windings  20  of a plurality of phases (for example, 3 phases), provided on the stator core  51  along a circumferential direction of the stator core  51 . In the stator core  51 , a plurality of teeth  51   a  protruding toward the inside in the radial direction (toward the output-side rotor  18 ) are placed along the circumferential direction of the stator with a space therebetween, and the stator winding  20  is wound around the teeth  51   a  to form the magnetic pole. An AC (alternating current) current of a plurality of phases (for example, 3 phases) flows in the stator windings  20  of the plurality of phases, so that the stator winding  20  generates a rotational magnetic field that rotates in the circumferential direction of the stator. In the example configuration of  FIGS. 3 and 4 , one magnetic pole is formed for six teeth  51   a  around which the stator windings  20  of three phases are wound. 
     The input-side rotor  28  includes a rotor core  52  and rotor windings  30  of a plurality of phases (for example, 3 phases), provided on the rotor core  52  along a circumferential direction of the rotor core  52 . In the rotor core  52 , a plurality of teeth  52   a  protruding toward the outside in the radial direction (toward the output-side rotor  18 ) are placed along the circumferential direction of the rotor with a space therebetween, and the rotor windings  30  are wound around the teeth  52   a  to form a magnetic pole. An AC current of a plurality of phases (for example, 3 phases) flows in the rotor windings  30  of the plurality of phases, so that the rotor winding  30  can generate a rotational magnetic field that rotates in the circumferential direction of the rotor. In the example configuration of  FIGS. 3 and 4 , one magnetic pole is formed for three teeth  52   a  around which the rotor windings  30  of three phases are wound. 
     The output-side rotor  18  includes a plurality ( 16  in the example configuration of  FIGS. 3 and 4 ) of permanent magnets  33  placed with a space therebetween (with an equal space) along the circumferential direction of the rotor, and a plurality (the same number as the permanent magnets  33 ;  16  in the example configuration of  FIGS. 3 and 4 ) of soft magnetic members  53  each of which is placed between permanent magnets  33  that are adjacent to each other in the circumferential direction of the rotor. Each of the plurality of soft magnetic members  53  placed in a divided manner with equal space in the circumferential direction of the rotor comprises an inner circumferential surface (first surface)  61  which opposes the input-side rotor  28  (teeth  52   a ) with a predetermined gap therebetween, an outer circumferential surface (second surface)  62  which opposes the stator  16  (teeth  51   a ) with a predetermined gap therebetween, a side surface (third surface)  63  which faces (contacts) a magnetic pole surface of one of adjacent permanent magnets  33 , and a side surface (fourth surface)  64  which faces (contacts) a magnetic pole surface of the other of the adjacent permanent magnets  33 , and a magnetic flux passes between the inner circumferential surface  61  and the outer circumferential surface  62 . In the example configuration of  FIGS. 3 and 4 , the magnetic pole surface of each permanent magnet  33  is placed inclined with respect to the radial direction, and the side surfaces  63  and  64  of each soft magnetic member  53  are also formed inclined with respect to the radial direction. In addition, in the example configuration of  FIGS. 3 and 4 , in each soft magnetic member  53 , a width of the inner circumferential surface  61  along the circumferential direction of the rotor is equal to the space between teeth  52   a  that are three teeth away from each other in the circumferential direction of the rotor, and a width of the outer circumferential surface  62  along the circumferential direction of the rotor is equal to the space between teeth  51   a  that are six teeth away from each other in the circumferential direction of the rotor. In the following description, when the plurality of permanent magnets need to be distinguished, the permanent magnets will be described with reference numerals  33 - 1 ,  33 - 2 , and  33 - 3 . Similarly, in the following description, when the plurality of soft magnetic members  53  need to be distinguished, the soft magnetic members will be described with reference numerals  53 - 1  and  53 - 2 , and the inner circumferential surfaces  61 , the outer circumferential surfaces  62 , and side surfaces  63  and  64  of the soft magnetic members  53  will also be referred with reference numerals of  61 - 1 ,  61 - 2 ,  62 - 1 ,  62 - 2 ,  63 - 1 ,  63 - 2 ,  64 - 1 , and  64 - 2  as necessary. 
     In each soft magnetic member  53 , the magnetic pole surface of the permanent magnet  33  faced by the side surface  63  and the magnetic pole surface of the permanent magnet  33  faced by the side surface  64  have the same polarity, and the same poles of the permanent magnets  33  adjacent in the circumferential direction of the rotor are connected via the soft magnetic member  53 . For example, in the soft magnetic member  53 - 1 , the magnetic pole surface of the permanent magnet  33 - 1  contacted by the side surface  63 - 1  is an N pole surface, and the magnetic pole surface of the permanent magnet  33 - 2  contacted by the side surface  64 - 1  is an N pole surface. On the other hand, in the soft magnetic member  53 - 2  adjacent to the soft magnetic member  53 - 1  in the circumferential direction of the rotor with the permanent magnet  33 - 2  therebetween, the magnetic pole surface of the permanent magnet  33 - 2  faced by the side surface  63 - 2  is an S pole surface, and the magnetic pole surface of the permanent magnet  33 - 3  contacted by the side surface  64 - 2  is an S pole surface. Because of this, in the soft magnetic members  53  adjacent in the circumferential direction of the rotor (for example, the soft magnetic members  53 - 1  and  53 - 2 ), the magnetic pole surfaces of the permanent magnets  33  faced by the side surfaces  63  and  64  are of opposite polarities from each other, and the soft magnetic member  53  in which the side surfaces  63  and  64  contact the N pole surfaces of the permanent magnets  33  and the soft magnetic member  53  in which the side surfaces  63  and  64  contact the S pole surfaces of the permanent magnets  33  are alternately placed along the circumferential direction of the rotor. In addition, between the soft magnetic members  53  adjacent in the circumferential direction of the rotor (for example, the soft magnetic members  53 - 1  and  53 - 2 ), in addition to the permanent magnets  33 , a gap  54  for increasing the magnetic resistance is provided. Alternatively, a non-magnetic material may be provided in place of the gap  54 . Alternatively, the soft magnetic members  53  adjacent in the circumferential direction of the rotor (for example, soft magnetic members  53 - 1  and  53 - 2 ) may be connected to each other by a bridge. 
       FIG. 4  shows a flow of a field magnetic flux by the permanent magnets  33 . As shown in  FIG. 4  by the arrows, in the soft magnetic member  53 - 1 , the field magnetic flux by the permanent magnet  33 - 1  flows from the side surface  63 - 1  to the inner circumferential surface  61 - 1  and the outer circumferential surface  62 - 1 , and a field magnetic flux by the permanent magnet  33 - 2  flows from the side surface  64 - 1  to the inner circumferential surface  61 - 1  and the outer circumferential surface  62 - 1 . In relation to the input-side rotor  28 , the inner circumferential surface  61 - 1  of the soft magnetic member  53 - 1  functions as the N pole surface, and a field magnetic flux acts from the inner circumferential surface  61 - 1  of the soft magnetic member  53 - 1  to the input-side rotor  28  (teeth  52   a ). In relation to the stator  16 , the outer circumferential surface  62 - 1  of the soft magnetic member  53 - 1  functions as the N pole surface, and a field magnetic flux acts from the outer circumferential surface  62 - 1  of the soft magnetic member  53 - 1  to the stator  16  (teeth  51   a ). On the other hand, in the soft magnetic member  53 - 2 , a field magnetic flux by the permanent magnet  33 - 2  flows from the inner circumferential surface  61 - 2  and the outer circumferential surface  62 - 2  to the side surface  63 - 2 , and a field magnetic flux by the permanent magnet  33 - 3  flows from the inner circumferential surface  61 - 2  and the outer circumferential surface  62 - 2  to the side surface  63 - 3 . In relation to the input-side rotor  28 , the inner circumferential surface  61 - 2  of the soft magnetic member  53 - 2  functions as the S pole surface, and a field magnetic flux acts from the input-side rotor  28  (teeth  52   a ) to the inner circumferential surface  61 - 2  of the soft magnetic member  53 - 2 . In relation to the stator  16 , the outer circumferential surface  62 - 2  of the soft magnetic member  53 - 2  functions as the S pole surface, and a field magnetic flux acts from the stator  16  (teeth  51   a ) to the outer circumferential surface  62 - 2  of the soft magnetic member  53 - 2 . In this manner, the inner circumferential surface  61  and the outer circumferential surface  62  of the same soft magnetic member  53  function as the magnetic pole surfaces of the same polarity. In the circumferential direction of the rotor, the inner circumferential surface  61  functioning as the N pole surface and the inner circumferential surface  61  functioning as the S pole surface are alternately placed, and the outer circumferential surface  62  functioning as the N pole surface and the outer circumferential surface  62  functioning as the S pole surface are alternately placed. In the inside of each soft magnetic member  53 , in order to facilitate passing of the magnetic flux between the inner circumferential surface  61  and the outer circumferential surface  62 , between the side surfaces  63  and  64  and the inner circumferential surface  61 , and between the side surfaces  63  and  64  and the outer circumferential surface  62 , the gap and the non-magnetic material are preferably not provided, and a portion of high magnetic resistance is preferably not provided. 
     An electricity storage device  42  which can be charged and discharged and which is provided as a DC (direct current) power supply can be formed by, for example, a secondary battery, and stores electric energy. An inverter  40  provided as the first electric power conversion device for converting electric power between the electricity storage device  42  and the stator winding  20  can be realized by a known structure having a switching element and a diode (rectifying element) connected inversely parallel with respect to the switching element, and can convert DC electric power from the electricity storage device  42  into AC power (for example, 3-phase AC power) by a switching operation of the switching element and supply the converted power to each phase of the stator winding  20 . In addition, the inverter  40  can also convert the electric power in a direction to convert the AC current flowing in each phase of the stator winding  20  into DC current and to recover the electric energy into the electricity storage device  42 . As described, the inverter  40  can convert the electric power in both directions between the electricity storage device  42  and the stator winding  20 . 
     A slip ring  95  is mechanically connected to the input-side rotor  28 , and is electrically connected to each phase of the rotor winding  30 . A brush  96  having its rotation fixed is pressed against the slip ring  95  and electrically contacts the slip ring  95 . The slip ring  95  rotates along with the input-side rotor  28  while sliding with respect to the brush  96  (while maintaining electrical contact with the brush  96 ). The brush  96  is electrically connected to an inverter  41 . The inverter  41  provided as a second electric power conversion device that converts electric power between at least one of the electricity storage device  42  and the inverter  40  and the rotor winding  30  can be realized by a known structure having a switching element and a diode (rectifying element) connected inversely parallel with respect to the switching element, and can convert DC electric power from the electricity storage device  42  into AC power (for example, 3-phase AC power) by a switching operation of the switching element and supply the converted power to each phase of the rotor winding  30  through the brush  96  and the slip ring  95 . In addition, the inverter  41  can also convert the electric power in a direction to convert the AC current flowing in each phase of the rotor winding  30  into DC current. In this process, the AC electric power of the rotor winding  30  is taken out by the slip ring  95  and the brush  96 , and the taken-out AC electric power is converted into DC power by the inverter  41 . The electric power converted to DC by the inverter  41  may be converted into AC power by the inverter  40  and supplied to each phase of the stator winding  20 . In other words, the inverter  40  can convert at least one of the DC electric power from the inverter  41  and the DC electric power from the electricity storage device  42  into AC power, and supply the converted power to each phase of the stator winding  20 . In addition, the electric power converted into DC by the inverter  41  can be recovered into the electricity storage device  42 . As described, the inverter  41  can convert electric power in both directions between one of the electricity storage device  42  and the inverter  40  and the rotor winding  30 . 
     An electronic control unit  50  is formed as a microprocessor with a CPU as a core, and comprises a ROM that stores a processing program, a RAM that temporarily stores data, and an input/output port. The electronic control unit  50  controls the electric power conversion at the inverter  40  by controlling the switching operation of the switching element of the inverter  40 , to control the AC current flowing in each phase of the stator winding  20 . The electronic control unit  50  also controls the electric power conversion at the inverter  41  by controlling the switching operation of the switching element of the inverter  41 , to control the AC current flowing in each phase of the rotor winding  30 . Further, the electronic control unit  50  controls an operation state of the engine  36 , and a gear ratio of the transmission  44 . 
     With the switching operation of the inverter  40 , an AC current of 3 phases flows in the stator winding  20  of 3 phases, the stator winding  20  generates a rotational magnetic flux that rotates in the circumferential direction of the stator, and a magnetic flux due to the current in the stator winding  20  acts on the output-side rotor  18 . In response, by an electromagnetic interaction (attraction and repulsion) between the rotational magnetic flux generated by the AC current in the stator winding  20  and the field magnetic flux generated by the permanent magnet  33  flowing between the outer circumferential surface  62  and the 2D side surfaces  63  and  64  of the soft magnetic member  53 , a torque T out  can be caused to act between the stator  16  and the output-side rotor  18 , and the output-side rotor  18  can be rotationally driven. In other words, the electric power supplied from the electricity storage device  42  to the stator winding  20  through the inverter  40  can be converted into the motive power (mechanical motive power) of the output-side rotor  18 , and the stator  16  and the output-side rotor  18  can function as a synchronous motor (PM motor unit). Moreover, the motive power of the output-side rotor  18  can be converted into the electric power of the stator winding  20 , and the electric power can be recovered into the electricity storage device  42  through the inverter  40 . The electronic control unit  50  can control the torque (PM motor torque) T out  acting between the stator  16  and the output-side rotor  18 , by controlling, for example, at least one of an amplitude and a phase angle of the AC current flowing in the stator winding  20  by the switching operation of the inverter  40 . 
     When the input-side rotor  28  rotates relative to the output-side rotor  18  and a rotation difference is caused between the input-side rotor  28  and the output-side rotor  18 , an induced electromotive force is generated in the rotor winding  30 , an induced current (AC current) flows in the rotor winding  30  due to the induced electromotive force, a rotational magnetic field is generated, and a magnetic flux due to the current in the rotor winding  30  acts on the output-side rotor  18 . In response, by an electromagnetic interaction between the rotational magnetic field generated by the induced current in the rotor winding  30  and the field magnetic flux by the permanent magnet  33  flowing between the inner circumferential surface  61  and the side surfaces  63  and  64  of the soft magnetic member  53 , a torque T in  can be caused to act between the input-side rotor  28  and the output-side rotor  18 , and the output-side rotor  18  can be rotationally driven. Because of this, the motive power (mechanical motive power) can be transmitted between the input-side rotor  28  and the output-side rotor  18 , and the input-side rotor  28  and the output-side rotor  18  can function as an induction electromagnetic coupling unit. 
     When the torque (electromagnetic coupling torque) T in  is to be generated between the input-side rotor  28  and the output-side rotor  18  by the induced current in the rotor winding  30 , the electronic control unit  50  applies the switching operation of the inverter  41  to allow flow of the induced current in the rotor winding  30 . In this process, the electronic control unit  50  can control the electromagnetic coupling torque T in  acting between the input-side rotor  28  and the output-side rotor  18  by controlling the AC current flowing in the rotor winding  30  by the switching operation of the inverter  41 . On the other hand, when the electronic control unit  50  stops the switching operation by maintaining the switching element of the inverter  41  at the OFF state, the induced current does not flow in the rotor winding  30 , and the torque T in  does not act between the input-side rotor  28  and the output-side rotor  18 . 
     When the engine  36  is generating the motive power, the motive power of the engine  36  is transmitted to the input-side rotor  28 , and the input-side rotor  28  is rotationally driven in the engine rotation direction. When a rotational speed of the input-side rotor  28  becomes higher than a rotational speed of the output-side rotor  18 , the induced electromotive force is generated in the rotor winding  30 . The electronic control unit  50  applies the switching operation of the inverter  41  to allow the flow of the induced current in the rotor winding  30 . In response to the magnetic flux due to the current in the rotor winding  30  acting on the output-side rotor  18 , the electromagnetic coupling torque T in  in the engine rotation direction acts from the input-side rotor  28  to the output-side rotor  18 , and the output-side rotor  18  is rotationally driven in the engine rotation direction. In this manner, the motive power from the engine  36  transmitted to the input-side rotor  28  is transmitted to the output-side rotor  18  by the electromagnetic coupling between the rotor winding  30  of the input-side rotor  28  and the permanent magnet  33  of the output-side rotor  18 . The motive power transmitted to the output-side rotor  18  is gear-changed by the transmission  44  and is transmitted to the drive shaft  37  (wheel  38 ), and is used for forward rotation driving of a load such as a forward travel driving of the vehicle. Therefore, the wheel  38  can be rotationally driven in the forward rotation direction using the motive power of the engine  36 , and the vehicle can be driven in the forward traveling direction. In addition, because the rotational difference between the input-side rotor  28  and the output-side rotor  18  can be tolerated, even when the rotation of the wheel  38  is stopped, the engine  36  does not stall. Because of this, the rotary electric machine  10  can be caused to function as a travel starting device, obviating the need for separate provision of a travel starting device such as a frictional clutch and a torque converter. 
     Moreover, the AC electric power generated in the rotor winding  30  is taken out through the slip ring  95  and the brush  96 . The taken-out AC electric power is converted into DC power by the inverter  41 . With the switching operation of the inverter  40 , the DC electric power from the inverter  41  is converted into AC power by the inverter  40  and supplied to the stator winding  20 , so that an AC current flows in the stator winding  20 , and a rotational magnetic flux is formed in the stator  16 . In response to the magnetic flux due to the current in the stator winding  20  acting on the output-side rotor  18 , the torque T out  in the engine rotation direction can be caused to act from the stator  16  to the output-side rotor  18 . With such a configuration, a torque amplification function for amplifying the torque in the engine rotation direction of the output-side rotor  18  can be realized. In addition, the DC electric power from the inverter  41  can be recovered into the electricity storage device  42 . 
     Further, by controlling the switching operation of the inverter  40  to supply electric power from the electricity storage device  42  to the stator winding  20 , it is possible to rotationally drive the wheel  38  in the forward rotation direction using the motive power of the engine  36 , and to assist the rotational driving in the forward rotation direction of the wheel  38  by the motive power of the output-side rotor  18  generated using the supplied electric power to the stator winding  20 . In addition, during a deceleration operation of the load, the electronic control unit  50  can control the switching operation of the inverter  40  to recover the electric power from the stator winding  20  to the electricity storage device  42 , so that the motive power of the load can be converted into the electric power of the stator winding  20  by the electromagnetic coupling between the stator winding  20  and the permanent magnet  33 , and the electric power can be recovered into the electricity storage device  42 . 
     When EV (Electric Vehicle) travel is to be executed in which the load is driven (the wheel  38  is rotationally driven) without using the motive power of the engine  36 , but using the motive power of the rotary electric machine  10 , the electronic control unit  50  controls the switching operation of the inverter  40  to control the driving of the load. For example, the electronic control unit  50  controls the switching operation of the inverter  40  to convert the DC electric power from the electricity storage device  42  into AC power and supply the converted power to the stator winding  20 . With such a configuration, the supplied electric power to the stator winding  20  is converted into the motive power of the output-side rotor  18  by the electromagnetic coupling between the stator winding  20  and the permanent magnet  33 , and the drive shaft  37  (wheel  38 ) is rotationally driven. In this manner, even when the engine  36  is not generating the motive power, the wheel  38  can be rotationally driven by supplying electric power to the stator winding  20 . 
     Here, in the stator  16  and the output-side rotor  18 , the direction in which the magnetomotive force by the permanent magnet  33  acts on the stator  16 ; more specifically, a direction of the magnetic flux of the magnet passing through a center position of the outer circumferential surface  62  of the soft magnetic member  53  in the circumferential direction of the rotor, is set as a d-axis (magnetic flux axis), and a position deviated from the d-axis by 90° in the electric angle (position at an end of the outer circumferential surface  62  in the circumferential direction of the rotor) is set as a q-axis (torque axis). In the outer circumferential surface  62  of the soft magnetic member  53 , a current in the stator winding  20  for maximizing the d-axis magnetic flux passing through the center position in the circumferential direction of the rotor (minimizing the q-axis magnetic flux passing through the position of the end in the circumferential direction of the rotor) is set as a d-axis current, and a current in the stator winding  20  for maximizing the q-axis magnetic flux passing through the position of the end in the circumferential direction of the rotor (minimizing the d-axis magnetic flux passing through the center position in the circumferential direction of the rotor) is set as a q-axis current. Similarly, in the input-side rotor  28  and the output-side rotor  18 , a direction in which the magnetomotive force by the permanent magnet  33  acts on the input-side rotor  28 ; more specifically, a direction of the magnetic flux of the magnet passing through a center position of the inner circumferential surface  61  of the soft magnetic member  53  in the circumferential direction of the rotor, is set as the d-axis, and a position deviated from the d-axis by 90° in the electric angle (position of the end of the inner circumferential surface  61  in the circumferential direction of the rotor) is set as the q-axis. In the inner circumferential surface  61  of the soft magnetic member  53 , a current in the rotor winding  30  for maximizing a d-axis magnetic flux passing through a center position in the circumferential direction of the rotor (minimizing a q-axis magnetic flux passing through the position of the end in the circumferential direction of the rotor) is set as the d-axis current, and a current in the rotor winding  30  for maximizing the q-axis magnetic flux passing through the position of the end in the circumferential direction of the rotor (minimizing the d-axis magnetic flux passing through the center position in the circumferential direction of the rotor) is set as the q-axis current. 
       FIG. 5  shows a flow of the d-axis magnetic flux in the case where the d-axis current flows in the rotor winding  30 . As shown by the arrows in  FIG. 5 , the d-axis magnetic flux due to the d-axis current in the rotor winding  30  acts from the input-side rotor  28  (teeth  52   a ) to the inner circumferential surface  61 - 1  of the soft magnetic member  53 - 1 , flows in the soft magnetic member  53 - 1  from the inner circumferential surface  61 - 1  to the outer circumferential surface  62 - 1 , and acts on the stator  16  (teeth  51   a ) and is linked to the stator winding  20 . The d-axis magnetic flux flowing in the stator  16  acts from the teeth  51   a  to the outer circumferential surface  62 - 2  of the soft magnetic member  53 - 2 , flows in the soft magnetic member  53 - 2  from the outer circumferential surface  62 - 2  to the inner circumferential surface  61 - 2 , and returns to the input-side rotor  28  (teeth  52   a ). As shown by the arrows in  FIGS. 4 and 5 , the d-axis magnetic flux due to the d-axis current in the rotor winding  30  acts in the opposite direction from the field magnetic flux by the permanent magnet  33  for the input-side rotor  28 , and acts in the same direction as the field magnetic flux by the permanent magnet  33  for the stator  16 . Because of this, by generating the d-axis magnetic flux by the d-axis current in the rotor winding  30  to weaken the field magnetic flux acting from the permanent magnet  33  to the input-side rotor  28 , it is possible to strengthen the field magnetic flux acting from the permanent magnet  33  to the stator  16 . In addition, by generating the d-axis magnetic flux by the d-axis current in the rotor winding  30  to strengthen the field magnetic flux acting from the permanent magnet  33  to the input-side rotor  28 , it is possible to weaken the field magnetic flux acting from the permanent magnet  33  to the stator  16 . In this manner, the d-axis magnetic flux due to the d-axis current in the rotor winding  30  affects the linkage magnetic flux to the stator winding  20  by flowing between the inner circumferential surface  61  and the outer circumferential surface  62  of the soft magnetic member  53  and acting on the stator  16 . 
     Meanwhile,  FIG. 6  shows a flow of the q-axis magnetic flux in the case where the q-axis current flows in the rotor winding  30 . As shown in  FIG. 6 , the q-axis magnetic flux due to the q-axis current in the rotor winding  30  acts from the input-side rotor  28  (teeth  52   a ) to the inner circumferential surface  61 - 1  of the soft magnetic member  53 - 1 , and flows in the soft magnetic member  53 - 1 . Compared to the d-axis magnetic flux, the amount of the q-axis magnetic flux acting from the outer circumferential surface  62 - 2  of the soft magnetic member  53 - 1  to the stator  16  (teeth  51   a ) is lower, and a large part of the q-axis magnetic flux flowing in the soft magnetic member  53 - 1  returns from the inner circumferential surface  61 - 1  of the soft magnetic member  53 - 1  to the input-side rotor  28  (teeth  52   a ). The flow of the q-axis magnetic flux in the soft magnetic member  53 - 2  is similar to that in the soft magnetic member  53 - 1 . Therefore, compared to the d-axis magnetic flux, the influence of the q-axis magnetic flux due to the q-axis current in the rotor winding  30  on the linkage magnetic flux to the stator winding  20  is lower. 
       FIG. 7  shows a flow of the d-axis magnetic flux in the case where the d-axis current flows in the stator winding  20 . As shown by the arrows in  FIG. 7 , the d-axis magnetic flux due to the d-axis current in the stator winding  20  acts from the stator  16  (teeth  51   a ) to the outer circumferential surface  62 - 1  of the soft magnetic member  53 - 1 , flows in the soft magnetic member  53 - 1  from the outer circumferential surface  62 - 1  to the inner circumferential surface  61 - 1 , and acts on the input-side rotor  28  (teeth  52   a ) and is linked to the rotor winding  30 . The d-axis magnetic flux flowing in the input-side rotor  28  acts from the teeth  52   a  to the inner circumferential surface  61 - 2  of the soft magnetic member  53 - 2 , flows in the soft magnetic member  53 - 2  from the inner circumferential surface  61 - 2  to the outer circumferential surface  62 - 2 , and returns to the stator  16  (teeth  51   a ). As shown by the arrows in  FIGS. 4 and 7 , the d-axis magnetic flux due to the d-axis current in the stator winding  20  acts in an opposite direction from the field magnetic flux by the permanent magnet  33  for the stator  16 , and acts in the same direction as the field magnetic flux by the permanent magnet  33  for the input-side rotor  28 . Because of this, by generating the d-axis magnetic flux by the d-axis current in the stator winding  20  to weaken the field magnetic flux acting from the permanent magnet  33  to the stator  16 , it is possible to strengthen the field magnetic flux acting from the permanent magnet  33  to the input-side rotor  28 . Similarly, by generating the d-axis magnetic flux by the d-axis current in the stator winding  20  to strengthen the field magnetic flux acting from the permanent magnet  33  to the stator  16 , it is possible to weaken the field magnetic flux acting from the permanent magnet  33  to the input-side rotor  28 . In this manner, the d-axis magnetic flux due to the d-axis current in the stator winding  20  affects the linkage magnetic flux to the rotor winding  30  by flowing between the outer circumferential surface  62  and the inner circumferential surface  61  of the soft magnetic member  53  and acting on the input-side rotor  28 . 
     On the other hand,  FIG. 8  shows a flow of the q-axis magnetic flux in the case where the q-axis current flows in the stator winding  20 . As shown in  FIG. 8 , the q-axis magnetic flux by the q-axis current in the stator winding  20  acts from the stator  16  (teeth  51   a ) to the outer circumferential surface  62 - 1  of the soft magnetic member  53 - 1 , and flows in the soft magnetic member  53 - 1 . Compared to the d-axis magnetic flux, the amount of the q-axis magnetic flux acting from the inner circumferential surface  61 - 1  of the soft magnetic member  53 - 1  to the input-side rotor  28  (teeth  52   a ) is lower, and a large part of the q-axis magnetic flux flowing in the soft magnetic member  53 - 1  returns from the outer circumferential surface  62 - 1  of the soft magnetic member  53 - 1  to the stator  16  (teeth  51   a ). The flow of the q-axis magnetic flux in the soft magnetic member  53 - 2  is similar to that in the soft magnetic member  53 - 1 . Therefore, compared to the d-axis magnetic flux, the influence of the q-axis magnetic flux due to the q-axis current in the stator winding  20  on the linkage magnetic flux to the rotor winding  30  is lower. 
     Thus, when the AC current is applied to the rotor winding  30  and the stator winding  20 , the d-axis magnetic flux component due to the d-axis current component in the rotor winding  30  can weaken the field magnetic flux by the permanent magnet  33  acting on the input-side rotor  28 , and strengthen the field magnetic flux by the permanent magnet  33  acting on the stator  16 . In other words, the d-axis magnetic flux component due to the d-axis current component in the rotor winding  30  can be set as a weakening field magnetic flux for the rotor winding  30  itself, and also as a strengthening field magnetic flux for the stator winding  20 . The strengthening field magnetic flux interacts with the q-axis current component in the stator winding  20 , so that an additional torque separate from a magnet torque and a reluctance torque is generated between the stator  16  and the output-side rotor  18 , and a torque amplification effect can be obtained. In this process, unlike the strengthening field control of the related art, because the weakening field for the rotor winding  30  itself is used, it is possible to amplify the torque T out  between the stator  16  and the output-side rotor  18  while inhibiting a counter electromotive force in the rotor winding  30 . 
     Similarly, when the AC current is applied to the rotor winding  30  and the stator winding  20 , the d-axis magnetic flux component due to the d-axis current component in the stator winding  20  can weaken the field magnetic flux by the permanent magnet  33  acting on the stator  16 , and strengthen the field magnetic flux by the permanent magnet  33  acting on the input-side rotor  28 . In other words, the d-axis magnetic flux component due to the d-axis current component in the stator winding  20  can be set as a weakening field magnetic flux for the stator winding  20  itself, and also as a strengthening field magnetic flux for the rotor winding  30 . The strengthening field magnetic flux interacts with the q-axis current component in the rotor winding  30  so that an additional torque is also generated between the input-side rotor  28  and the output-side rotor  18 , and a torque amplification effect can be obtained. In this process, unlike the strengthening field control of the related art, because the weakening field for the stator winding  20  itself is used, the torque T in  between the input-side rotor  28  and the output-side rotor  18  can be amplified while inhibiting the counter electromotive force in the stator winding  20 . Therefore, a multiplier effect can be obtained in which the torque T in  between the input-side rotor  28  and the output-side rotor  18  and the torque T out  between the stator  16  and the output-side rotor  18  strengthen each other, while inhibiting the counter electromotive forces in the rotor winding  30  and the stator winding  20 . As a result, the amount of permanent magnets  33  can be reduced. 
     In addition, when an AC current is applied to the rotor winding  30  and the stator winding  20 , the d-axis magnetic flux component due to the d-axis current component in the rotor winding  30  can strengthen the field magnetic flux by the permanent magnet  33  acting on the input-side rotor  28 , and weaken the field magnetic flux by the permanent magnet  33  acting on the stator  16 . With this configuration, it is possible to amplify the torque T in  between the input-side rotor  28  and the output-side rotor  18  while inhibiting the counter electromotive force in the stator winding  20 . Similarly, the d-axis magnetic flux component due to the d-axis current component in the stator winding  20  can strengthen the field magnetic flux by the permanent magnet  33  acting on the stator  16 , and weaken the field magnetic flux by the permanent magnet  33  acting on the input-side rotor  28 . With such a configuration, the torque T out  between the stator  16  and the output-side rotor  18  can be amplified while inhibiting the counter electromotive force in the rotor winding  30 . 
     In this manner, in the rotary electric machine  10 , because the magnetic flux due to the current in the rotor winding  30  and the magnetic flux due to the current in the stator winding  20  magnetically interferes with each other, the linkage magnetic flux to the stator winding  20  can be adjusted by the current in the rotor winding  30  and the linkage magnetic flux to the rotor winding  30  can be adjusted by the current in the stator winding  20 . When the magnetic interference between the magnetic flux due to the current in the rotor winding  30  and the magnetic flux due to the current in the stator winding  20  is to be used, there are infinite combinations of a current I in  in the rotor winding  30  and a current I out  in the stator winding  20  for setting the torque T in  between the input-side rotor  28  and the output-side rotor  18  and the torque T out  between the stator  16  and the output-side rotor  18  to requested values. For example,  FIG. 9  shows a relationship for the combinations of I in  and I out  for generating T in =0 and T out =90 Nm. In  FIG. 9 , a current advance angle β in  of the rotor winding  30  is β in =90°, a current advance angle β out  of the stator winding  20  is β out =30°, and, the I in  on the horizontal axis and the I out  on the vertical axis are normalized by dividing these values by I out  which generates T out =90° at I in =0 (that is, a current value that does not use the magnetic interference). As shown in  FIG. 9 , there are infinite combinations of I in  and I out  for generating T in =0 and T out =90 Nm using the magnetic interference. 
       FIG. 10  shows an example functional block diagram of the electronic control unit  50  that controls the current I in  in the rotor winding  30  and the current I out  in the stator winding  20  of the rotary electric machine  10 . A coupling torque command value calculating unit  135  calculates a command value T in   _   ref  of the electromagnetic coupling torque acting between the input-side rotor  28  and the output-side rotor  18  based on, for example, a degree of opening of acceleration A (requested driving torque of the wheel  38 ) and a vehicle velocity V (rotational speed of the wheel  38 ). An MG torque command value calculating unit  155  calculates a command value T out   _   ref  of an MG torque acting between the stator  16  and the output-side rotor  18  based on, for example, the degree of opening of acceleration A (requested driving torque of the wheel  38 ) and the electromagnetic coupling torque command value T in   _   ref  calculated by the coupling torque command value calculating unit  135 . 
     A current command value setting unit  136  sets a d-axis current command value I in   _   d   _   ref  and a q-axis current command value I in   _   q   _   ref  of the rotor winding  30  and a d-axis current command value I out   _   d   _   ref  and a q-axis current command value I out   _   q   _   ref  of the stator winding  20  based on the electromagnetic coupling torque command value T in   _   ref  calculated by the coupling torque command value calculating unit  135  and the MG torque command value T out   _   ref  calculated by the MG torque command value calculating unit  155 . A torque-current characteristic storage unit  137  is formed as an information storage device, and stores a torque-current characteristic representing a relationship of a combination of the current command values (I in   _   d   _   ref , I in   _   q   _   ref , T out   _   ref , and I out   _   q   _   ref ) with respect to a combination of the torque command values (T in   _   ref  and T out   _   ref ). The current command value setting unit  136  reads the torque-current characteristic stored in the torque-current characteristic storage unit  137 , and sets, in the read torque-current characteristic, a combination of the current command values (I in   _   d   _   ref , I in   _   q   _   ref , I out   _   d   _   ref , and I out   _   q   _   ref ) corresponding to a combination of the torque command values (T in   _   ref  and T out   _   ref ). 
     A rotor winding current controller  140  controls the switching operation of the inverter  41  (electric power conversion at the inverter  41 ) so that a d-axis current I in   _   d  and a q-axis current I in   _   q  in the rotor winding  30  respectively match the d-axis current command value I in   _   d   _   ref  and the q-axis current command value I in   _   q   _   ref  which are set by the current command value setting unit  136 . A stator winding current controller  160  controls the switching operation of the inverter  40  (electric power conversion at the inverter  40 ) so that a d-axis current I out   _   d  and a q-axis current I out   _   q  in the stator winding  20  respectively match the d-axis current command value I out   _   d   _   ref  and the q-axis current command value I out   _   q   _   ref  which are set by the current command value setting unit  136 . With this configuration, a control is applied such that the electromagnetic coupling torque T in  between the input-side rotor  28  and the output-side rotor  18  matches the torque command value T in   _   ref  and such that the MG torque T out  between the stator  16  and the output-side rotor  18  matches the torque command value T out   _   ref . 
     Next, an information processing device  70  for calculating the combination of the current command values (I in   _   d   _   ref , I in   _   q   _   ref , I out   _   d   _   ref , and I out   _   q   _   ref ) based on the combination of the torque command values (T in   _   ref  and T out   _   ref ) of the rotary electric machine  10  will be described. The information processing device  70  may be formed as a microprocessor with a CPU as a core, and comprises a ROM that stores a processing program, a RAM that temporarily stores data, and an input/output port. 
       FIG. 10  shows an example functional block diagram of the information processing device  70 . A model storage unit  172  stores a model equation (physical equation) for calculating a linkage magnetic flux Φ in  of the rotor winding  30  and a linkage magnetic flux Φ out  of the stator winding  20 . As described above, in the rotary electric machine  10 , because the magnetic flux due to the current I in  the rotor winding  30  and the magnetic flux due to the current I out  in the stator winding  20  magnetically interfere with each other, the linkage magnetic flux Φ in  of the rotor winding  30  changes not only by the current I in  the rotor winding  30 , but also by the current I out  in the stator winding  20 , and is a function of the current I in  in the rotor winding  30  and the current I out  in the stator winding  20 . Similarly, the linkage magnetic flux Φ out  of the stator winding  20  is also a function of the current I in  in the rotor winding  30  and the current I out  in the stator winding  20 . Thus, the model storage unit  172  stores a magnetic interference model (first magnetic interference model) representing a relationship of the linkage magnetic flux Φ in  of the rotor winding  30  with respect to the current I in  in the rotor winding  30  and the current I out  in the stator winding  20 , and a magnetic interference model (second magnetic interference model) representing a relationship of the linkage magnetic flux Φ out  of the stator winding  20  with respect to the current I in  in the rotor winding  30  and the current I out  in the stator winding  20 . A current command value calculating unit  174  reads the first and second magnetic interference models stored in the model storage unit  172 , and calculates the current command values I in   _   d   _   ref  and I in   _   q   _   ref  of the rotor winding  30  and the current command values I out   _   d   _   ref  and I out   _   q   _   ref  of the stator winding  20  with respect to the given torque command values T in   _   ref  and T out   _   ref , based on an evaluation function f representing a total copper loss of the rotor winding  30  and the stator winding  20  and using the first and second magnetic interference models. 
     In the rotary electric machine  10 , the electromagnetic coupling torque T in  between the input-side rotor  28  and the output-side rotor  18  is represented by the following Equation (1), the MG torque T out  between the stator  16  and the output-side rotor  18  is represented by the following Equation (2), a voltage V in  of the rotor winding  30  is represented by the following Equation (3), a voltage V out  of the stator winding  20  is represented by the following Equation (4), the current I in  in the rotor winding  30  is represented by the following Equation (5), and the current I out  in the stator winding  20  is represented by the following Equation (6). The evaluation function f representing the total copper loss of the rotor winding  30  and the stator winding  20  is represented by the following Equation (7). In Equations (1)˜(7), I in   _   d  represents the d-axis current in the rotor winding  30 , I in   _   q  represents the q-axis current in the rotor winding  30 , I out   _   d  represents the d-axis current in the stator winding  20 , I out   _   q  represents the q-axis current in the stator winding  20 , Φ in   _   d  represents the d-axis linkage magnetic flux of the rotor winding  30 , Φ in   _   q  represents the q-axis linkage magnetic flux of the rotor winding  30 , Φ out   _   d  represents the d-axis linkage magnetic flux of the stator winding  20 , Φ out   _   q  represents the q-axis linkage magnetic flux of the stator winding  20 , R in  represents a phase resistance of the rotor winding  30 , R out  represents a phase resistance of the stator winding  20 , P in  represents a number of poles of an induction electromagnetic coupling unit by the input-side rotor  28  and the output-side rotor  18 , P out  represents a number of poles of a PM motor unit by the stator  16  and the output-side rotor  18 , ω in  represents a rotational angular speed of the input-side rotor  28 , and ω out  represents a rotational angular speed of the output-side rotor  18 . 
     
       
         
           
             
                 
             
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                                   ⁢ 
                                   d 
                                 
                               
                             
                             + 
                             
                               
                                 ( 
                                 
                                   
                                     ω 
                                     in 
                                   
                                   - 
                                   
                                     ω 
                                     out 
                                   
                                 
                                 ) 
                               
                               ⁢ 
                               
                                 Φ 
                                 
                                   in 
                                   ⁢ 
                                   _ 
                                   ⁢ 
                                   d 
                                 
                               
                             
                           
                           ) 
                         
                         2 
                       
                       + 
                       
                         
                           ( 
                           
                             
                               
                                 R 
                                 
                                   i 
                                   ⁢ 
                                   n 
                                 
                               
                               ⁢ 
                               
                                 I 
                                 
                                   in 
                                   ⁢ 
                                   _ 
                                   ⁢ 
                                   q 
                                 
                               
                             
                             + 
                             
                               
                                 ( 
                                 
                                   
                                     ω 
                                     in 
                                   
                                   - 
                                   
                                     ω 
                                     out 
                                   
                                 
                                 ) 
                               
                               ⁢ 
                               
                                 Φ 
                                 
                                   in 
                                   ⁢ 
                                   _ 
                                   ⁢ 
                                   q 
                                 
                               
                             
                           
                           ) 
                         
                         2 
                       
                     
                   
                 
               
               
                 
                   ( 
                   3 
                   ) 
                 
               
             
             
               
                 
                   
                       
                   
                   ⁢ 
                   
                     
                       V 
                       out 
                     
                     = 
                     
                       
                         
                           
                             ( 
                             
                               
                                 
                                   R 
                                   out 
                                 
                                 ⁢ 
                                 
                                   I 
                                   
                                     out 
                                     ⁢ 
                                     _ 
                                     ⁢ 
                                     d 
                                   
                                 
                               
                               + 
                               
                                 
                                   ω 
                                   out 
                                 
                                 ⁢ 
                                 
                                   Φ 
                                   
                                     out 
                                     ⁢ 
                                     _ 
                                     ⁢ 
                                     d 
                                   
                                 
                               
                             
                             ) 
                           
                           2 
                         
                         + 
                         
                           
                             ( 
                             
                               
                                 
                                   R 
                                   out 
                                 
                                 ⁢ 
                                 
                                   I 
                                   
                                     out 
                                     ⁢ 
                                     _ 
                                     ⁢ 
                                     q 
                                   
                                 
                               
                               + 
                               
                                 
                                   ω 
                                   out 
                                 
                                 ⁢ 
                                 
                                   Φ 
                                   
                                     out 
                                     ⁢ 
                                     _ 
                                     ⁢ 
                                     q 
                                   
                                 
                               
                             
                             ) 
                           
                           2 
                         
                       
                     
                   
                 
               
               
                 
                   ( 
                   4 
                   ) 
                 
               
             
             
               
                 
                   
                       
                   
                   ⁢ 
                   
                     
                       I 
                       in 
                     
                     = 
                     
                       
                         
                           I 
                           
                             in 
                             ⁢ 
                             _ 
                             ⁢ 
                             d 
                           
                           2 
                         
                         + 
                         
                           I 
                           
                             in 
                             ⁢ 
                             _ 
                             ⁢ 
                             q 
                           
                           2 
                         
                       
                     
                   
                 
               
               
                 
                   ( 
                   5 
                   ) 
                 
               
             
             
               
                 
                   
                       
                   
                   ⁢ 
                   
                     
                       I 
                       out 
                     
                     = 
                     
                       
                         
                           I 
                           
                             out 
                             ⁢ 
                             _ 
                             ⁢ 
                             d 
                           
                           2 
                         
                         + 
                         
                           I 
                           
                             out 
                             ⁢ 
                             _ 
                             ⁢ 
                             q 
                           
                           2 
                         
                       
                     
                   
                 
               
               
                 
                   ( 
                   6 
                   ) 
                 
               
             
             
               
                 
                   
                       
                   
                   ⁢ 
                   
                     f 
                     = 
                     
                       
                         
                           R 
                           in 
                         
                         · 
                         
                           ( 
                           
                             
                               I 
                               
                                 in 
                                 ⁢ 
                                 _ 
                                 ⁢ 
                                 d 
                               
                               2 
                             
                             + 
                             
                               I 
                               
                                 in 
                                 ⁢ 
                                 _ 
                                 ⁢ 
                                 q 
                               
                               2 
                             
                           
                           ) 
                         
                       
                       + 
                       
                         
                           R 
                           out 
                         
                         · 
                         
                           ( 
                           
                             
                               I 
                               
                                 out 
                                 ⁢ 
                                 _ 
                                 ⁢ 
                                 d 
                               
                               2 
                             
                             + 
                             
                               I 
                               
                                 out 
                                 ⁢ 
                                 _ 
                                 ⁢ 
                                 q 
                               
                               2 
                             
                           
                           ) 
                         
                       
                     
                   
                 
               
               
                 
                   ( 
                   7 
                   ) 
                 
               
             
           
         
       
     
     In the first magnetic interference model, the d-axis linkage magnetic flux Φ in   _   d  of the rotor winding  30  (model related to the d-axis linkage magnetic flux) can be represented by the following Equation (8) which is a function of I in   _   d , I in   _   q , I out   _   d , and T out   _   q . 
     
       
         
           
             
                 
             
             ⁢ 
             
               [ 
               
                 Equation 
                 ⁢ 
                 
                   
                       
                   
                   ⁢ 
                   
                       
                   
                 
                 ⁢ 
                 2 
               
               ] 
             
           
         
       
       
         
           
             
               
                 
                   
                     
                       Φ 
                       
                         in 
                         ⁢ 
                         _ 
                         ⁢ 
                         d 
                       
                     
                     ⁡ 
                     
                       ( 
                       
                         
                           I 
                           
                             in 
                             ⁢ 
                             _ 
                             ⁢ 
                             d 
                           
                         
                         , 
                         
                           I 
                           
                             in 
                             ⁢ 
                             _ 
                             ⁢ 
                             q 
                           
                         
                         , 
                         
                           I 
                           
                             out 
                             ⁢ 
                             _ 
                             ⁢ 
                             d 
                           
                         
                         , 
                         
                           I 
                           
                             out 
                             ⁢ 
                             _ 
                             ⁢ 
                             q 
                           
                         
                       
                       ) 
                     
                   
                   = 
                   
                     
                       
                         ( 
                         
                           
                             L 
                             d 
                           
                           + 
                           
                             
                               L 
                               dd 
                             
                             * 
                             
                                
                               
                                 I 
                                 
                                   out 
                                   ⁢ 
                                   _ 
                                   ⁢ 
                                   d 
                                 
                               
                                
                             
                           
                         
                         ) 
                       
                       * 
                       
                         ( 
                         
                           
                             I 
                             
                               in 
                               ⁢ 
                               _ 
                               ⁢ 
                               d 
                             
                           
                           - 
                           
                             
                               C 
                               
                                 d 
                                 ⁢ 
                                 
                                     
                                 
                                 ⁢ 
                                 2 
                               
                             
                             * 
                             
                               I 
                               
                                 out 
                                 ⁢ 
                                 _ 
                                 ⁢ 
                                 d 
                               
                             
                           
                           - 
                           
                             f 
                             
                               
                                 m 
                                 ′ 
                               
                               ⁢ 
                               2 
                             
                           
                         
                         ) 
                       
                     
                     
                       
                         
                           
                             1 
                             + 
                             
                               
                                 ( 
                                 
                                   
                                     M 
                                     dd 
                                   
                                   + 
                                   
                                     
                                       M 
                                       ddd 
                                     
                                     * 
                                     
                                        
                                       
                                         I 
                                         
                                           out 
                                           ⁢ 
                                           _ 
                                           ⁢ 
                                           d 
                                         
                                       
                                        
                                     
                                   
                                 
                                 ) 
                               
                               * 
                               
                                 
                                    
                                   
                                     
                                       I 
                                       
                                         in 
                                         ⁢ 
                                         _ 
                                         ⁢ 
                                         d 
                                       
                                     
                                     - 
                                     
                                       
                                         C 
                                         
                                           d 
                                           ⁢ 
                                           
                                               
                                           
                                           ⁢ 
                                           1 
                                         
                                       
                                       * 
                                       
                                         I 
                                         
                                           out 
                                           ⁢ 
                                           _ 
                                           ⁢ 
                                           d 
                                         
                                       
                                     
                                     - 
                                     
                                       f 
                                       
                                         
                                           m 
                                           ′ 
                                         
                                         ⁢ 
                                         1 
                                       
                                     
                                   
                                    
                                 
                                 kdd 
                               
                             
                             + 
                           
                         
                       
                       
                         
                           
                             
                               ( 
                               
                                 
                                   M 
                                   dq 
                                 
                                 + 
                                 
                                   
                                     M 
                                     dqd 
                                   
                                   * 
                                   
                                      
                                     
                                       I 
                                       
                                         out 
                                         ⁢ 
                                         _ 
                                         ⁢ 
                                         d 
                                       
                                     
                                      
                                   
                                 
                               
                               ) 
                             
                             * 
                             
                               
                                  
                                 
                                   
                                     I 
                                     
                                       in 
                                       ⁢ 
                                       _ 
                                       ⁢ 
                                       q 
                                     
                                   
                                   + 
                                   
                                     
                                       C 
                                       
                                         q 
                                         ⁢ 
                                         
                                             
                                         
                                         ⁢ 
                                         1 
                                       
                                     
                                     * 
                                     
                                       I 
                                       
                                         out 
                                         ⁢ 
                                         _ 
                                         ⁢ 
                                         q 
                                       
                                     
                                   
                                 
                                  
                               
                               kdq 
                             
                           
                         
                       
                     
                   
                 
               
               
                 
                   ( 
                   8 
                   ) 
                 
               
             
           
         
       
     
     In the numerator on the right side of Equation (8), C d2  represents a coefficient representing a degree of the magnetic interference of the d-axis, and f m′2  represents a d-axis magnetomotive force by the magnetomotive force of the permanent magnet  33 . The term (I in   _   d −C d2 *I out   _   d −f m′2 ) is a model equation related to the d-axis magnetomotive force in which I in   _   d  and I out   _   d  are combined with a setting ratio of 1:C d2 , and represents a total sum of magnetomotive forces of the d-axis acting on the input-side rotor  28 , taking into consideration the magnetic interference between the magnetomotive force due to I in   _   d  and the magnetomotive force due to I out   _   d . The term L d  represents the d-axis inductance I in   _   d =I out   _   d =0) of the induction electromagnetic coupling unit, L dd  represents a change rate of the d-axis inductance of the induction electromagnetic coupling unit due to I out   _   d , and (L d +L dd *|I out   _   d |) represents the d-axis inductance of the induction electromagnetic coupling unit at no load (I in   _   d =0). Therefore, the numerator on the right side of Equation (8) corresponds to a product of the total sum of the magnetomotive forces of the d-axis and the d-axis inductance of the induction electromagnetic coupling unit at no load, and represents the d-axis linkage magnetic flux of the rotor winding  30  in consideration of the magnetic interference between the magnetic flux due to I in   _   d  and the magnetic flux due to I out   _   d  in the case where magnetic saturation does not occur in the d-axis magnetic circuit. 
     Meanwhile, in the denominator on the right side of Equation (8), C d1  is a coefficient representing a degree of magnetic interference of the d-axis, f m′1  is the d-axis magnetomotive force by the magnetomotive force of the permanent magnet  33 , kdd is a constant unique to the induction electromagnetic coupling unit, and |I in   _   d −C d1 *I out   _   d −f m′1 | represents a magnitude of a total sum of the magnetomotive forces of the d-axis. The term M dd  represents a saturation coefficient of the d-axis magnetic circuit, M ddd  represents a change rate of the saturation coefficient of the d-axis magnetic circuit by I out   _   d , and (M dd +M ddd *|I out   _   d |) corresponds to a coefficient representing the degree of magnetic saturation of the d-axis by I out   _   d . Therefore, the term (M dd +M add *|I out   _   d |)*|I in   _   d −C d1 *|I out   _   d −f m′1 | kdd  is a model equation representing a degree of change of the d-axis linkage magnetic flux by the magnetic saturation caused by the d-axis magnetomotive force, and corresponds to a degree of magnetic saturation of the d-axis by the d-axis magnetomotive force. In addition, C q1  is a coefficient representing a degree of the magnetic interference of the q-axis, kdq is a constant unique to the induction electromagnetic coupling unit, and |I in   _   q +C q1 *I out   _   q | represents a magnitude of a total sum of the magnetomotive forces of the q-axis taking into consideration the magnetic interference between the magnetomotive force due to I in   _   q  and the magnetomotive force due to I out   _   q . The term M dq  represents a saturation coefficient of the q-axis magnetic circuit, M dqd  represents a change rate of the saturation coefficient of the q-axis magnetic circuit by I out   _   d , and (M dq +M dqd *|I out   _   d |) corresponds to a coefficient representing a degree of magnetic saturation of the q-axis. Therefore, (M dq +M dqd *|I out   _   d |)*|I in   _   q +C q1 *I out   _   q | kdq  is a model equation representing a degree of change of the d-axis linkage magnetic flux by the magnetic saturation caused by the q-axis magnetomotive force, and corresponds to the degree of the magnetic saturation of the d-axis by the q-axis magnetomotive force. The denominator on the right side of Equation (8) is a model equation representing a degree of change of the d-axis linkage magnetic flux by the magnetic saturation, and corresponds to the degree of the magnetic saturation of the d-axis by the d-axis and q-axis magnetomotive forces. As a result, Equation (8) represents the d-axis linkage magnetic flux of the rotor winding  30  taking into consideration the magnetic interference between the magnetic flux due to I in   _   d  and the magnetic flux due to I out   _   d  in a case where the magnetic saturation occurs in the d-axis magnetic circuit. 
     The term f m′1  in the denominator on the right side of Equation (8) can be represented by the following Equation (9) which is a function of the q-axis currents I in   _   q  and I out   _   q , because the d-axis magnetomotive force changes by the magnetic saturation of the d-axis magnetic circuit by the magnetic flux due to the q-axis current. Similarly, f m′2  in the numerator on the right side of Equation (8) can be represented by the following Equation (10), which is a function of the q-axis currents I in   _   q  and I out   _   q . In Equations (9) and (10), C 11 , C 12 , C 13 , C 21 , C 22 , and C 23  are coefficients representing the degree of magnetic interference, and f m′1  and f m′2  are exponential functions of (I in   _   q +C q1 *I out   _   q ) representing the total sum of the magnetomotive forces of the q-axis.
 
[Equation 3]
 
 f   m′1   =C   11   +C   12 *exp{−( I   in   _   q   +C   q1   *I   out   _   q ) 2   /C   13 }  (9)
 
 f   m′2   =C   21   +C   22 *exp{−( I   in   _   q   +C   q1   *I   out   _   q ) 2   /C   23 }  (10)
 
     In addition, in the first magnetic interference model, the q-axis linkage magnetic flux Φ in   _   q  of the rotor winding  30  (model related to the q-axis linkage magnetic flux) can be represented by the following Equation (11), which is a function of I in   _   d , I in   _   q , I out   _   d , and I out   _   q . 
     
       
         
           
             
                 
             
             ⁢ 
             
               [ 
               
                 Equation 
                 ⁢ 
                 
                     
                 
                 ⁢ 
                 4 
               
               ] 
             
           
         
       
       
         
           
             
               
                 
                   
                     
                       Φ 
                       
                         in 
                         ⁢ 
                         _ 
                         ⁢ 
                         q 
                       
                     
                     ⁡ 
                     
                       ( 
                       
                         
                           I 
                           
                             in 
                             ⁢ 
                             _ 
                             ⁢ 
                             d 
                           
                         
                         , 
                         
                           I 
                           
                             in 
                             ⁢ 
                             _ 
                             ⁢ 
                             q 
                           
                         
                         , 
                         
                           I 
                           
                             out 
                             ⁢ 
                             _ 
                             ⁢ 
                             d 
                           
                         
                         , 
                         
                           I 
                           
                             out 
                             ⁢ 
                             _ 
                             ⁢ 
                             q 
                           
                         
                       
                       ) 
                     
                   
                   = 
                   
                     
                       
                         ( 
                         
                           
                             L 
                             q 
                           
                           + 
                           
                             
                               L 
                               qq 
                             
                             * 
                             
                                
                               
                                 I 
                                 
                                   out 
                                   ⁢ 
                                   _ 
                                   ⁢ 
                                   q 
                                 
                               
                                
                             
                           
                         
                         ) 
                       
                       * 
                       
                         ( 
                         
                           
                             I 
                             
                               in 
                               ⁢ 
                               _ 
                               ⁢ 
                               q 
                             
                           
                           - 
                           
                             
                               I 
                               
                                 out 
                                 ⁢ 
                                 _ 
                                 ⁢ 
                                 q 
                               
                             
                             * 
                             
                               f 
                               
                                 
                                   m 
                                   ′ 
                                 
                                 ⁢ 
                                 3 
                               
                             
                           
                         
                         ) 
                       
                     
                     
                       
                         
                           
                             1 
                             + 
                             
                               
                                 ( 
                                 
                                   
                                     M 
                                     qd 
                                   
                                   + 
                                   
                                     
                                       M 
                                       qdq 
                                     
                                     * 
                                     
                                        
                                       
                                         I 
                                         
                                           out 
                                           ⁢ 
                                           _ 
                                           ⁢ 
                                           q 
                                         
                                       
                                        
                                     
                                   
                                 
                                 ) 
                               
                               * 
                               
                                 
                                    
                                   
                                     
                                       I 
                                       
                                         in 
                                         ⁢ 
                                         _ 
                                         ⁢ 
                                         d 
                                       
                                     
                                     + 
                                     
                                       
                                         C 
                                         
                                           d 
                                           ⁢ 
                                           
                                               
                                           
                                           ⁢ 
                                           3 
                                         
                                       
                                       * 
                                       
                                         I 
                                         
                                           out 
                                           ⁢ 
                                           _ 
                                           ⁢ 
                                           d 
                                         
                                       
                                     
                                     - 
                                     
                                       f 
                                       0 
                                     
                                   
                                    
                                 
                                 kqd 
                               
                             
                             + 
                           
                         
                       
                       
                         
                           
                             
                               ( 
                               
                                 
                                   M 
                                   qq 
                                 
                                 + 
                                 
                                   
                                     M 
                                     qqq 
                                   
                                   * 
                                   
                                      
                                     
                                       I 
                                       
                                         out 
                                         ⁢ 
                                         _ 
                                         ⁢ 
                                         q 
                                       
                                     
                                      
                                   
                                 
                               
                               ) 
                             
                             * 
                             
                               
                                  
                                 
                                   
                                     I 
                                     
                                       in 
                                       ⁢ 
                                       _ 
                                       ⁢ 
                                       q 
                                     
                                   
                                   + 
                                   
                                     
                                       ( 
                                       
                                         
                                           C 
                                           
                                             q 
                                             ⁢ 
                                             
                                                 
                                             
                                             ⁢ 
                                             30 
                                           
                                         
                                         + 
                                         
                                           
                                             C 
                                             
                                               q 
                                               ⁢ 
                                               
                                                   
                                               
                                               ⁢ 
                                               3 
                                             
                                           
                                           * 
                                           
                                              
                                             
                                               I 
                                               
                                                 out 
                                                 ⁢ 
                                                 _ 
                                                 ⁢ 
                                                 q 
                                               
                                             
                                              
                                           
                                         
                                       
                                       ) 
                                     
                                     * 
                                     
                                       I 
                                       
                                         out 
                                         ⁢ 
                                         _ 
                                         ⁢ 
                                         q 
                                       
                                     
                                   
                                 
                                  
                               
                               kqq 
                             
                           
                         
                       
                     
                   
                 
               
               
                 
                   ( 
                   11 
                   ) 
                 
               
             
           
         
       
     
     In the numerator on the right side of Equation (11), f m′3  represents a degree of magnetic interference of the magnetomotive force due to I out   _   q  on the magnetomotive force due to I in   _   q , and represents an influence by the magnetomotive force of the permanent magnet  33 . The term (I in   _   q −I out   _   q *f m′3 ) is a model equation related to the q-axis magnetomotive force in which I in   _   q  and I out   _   q  are combined with a setting ratio of 1:f m′3 , and represents a total sum of the magnetomotive forces of the q-axis acting on the input-side rotor  28  taking into consideration the magnetic interference between the magnetomotive force due to I in   _   q  and the magnetomotive force due to I out   _   q . The term L q  represents a q-axis inductance (I in   _   q =I out   _   q =0) of the induction electromagnetic coupling unit, L qq  represents a change rate of the q-axis inductance of the induction electromagnetic coupling unit by I out   _   q , and (L q +L qq *|I out   _   q |) represents the q-axis inductance of the induction electromagnetic coupling unit at no load (I in   _   q =0). Therefore, the numerator of the right side of Equation (11) corresponds to a product of the total sum of the magnetomotive forces of the q-axis and the q-axis inductance of the induction electromagnetic coupling unit at no load, and represents the q-axis linkage magnetic flux of the rotor winding  30  taking into consideration the magnetic interference between the magnetic flux due to I in   _   q  and the magnetic flux due to I out   _   q  in a case where the magnetic saturation does not occur in the q-axis magnetic circuit. 
     On the other hand, in the denominator on the right side of Equation (11), C d3  is a coefficient representing a degree of magnetic interference of the d-axis, f 0  represents the d-axis magnetomotive force by the magnetomotive force of the permanent magnet  33 , kqd is a constant unique to the induction electromagnetic coupling unit, and |I in   _   d +C d3 *I out   _   d −f 0 | represents a magnitude of the total sum of the magnetomotive forces of the d-axis. The term M qd  represents the saturation coefficient of the d-axis magnetic circuit, M qdq  represents a change rate of the saturation coefficient of the d-axis magnetic circuit by I out   _   q , and (M qd +M qdq *|I out   _   q |) corresponds to a coefficient representing the degree of the magnetic saturation of the d-axis by I out   _   q . Therefore, (M qd +M qdq *|I out   _   q |)*|I in   _   d +C d3 *I out   _   d −f 0 | kqd  is a model equation representing the degree of change of the q-axis linkage magnetic flux by the magnetic saturation caused by the d-axis magnetomotive force, and corresponds to the degree of magnetic saturation of the q-axis by the d-axis magnetomotive force. In addition, C q3  and C q30  are coefficients representing the degree of magnetic interference of the q-axis, kqq is a constant unique to the induction electromagnetic coupling unit, and |I in   _   q +(C q30 +C q3 *|I out   _   q )*|I out   _   q | represents a magnitude of the total sum of the magnetomotive forces of the d-axis. The term M qq  represents the saturation coefficient of the q-axis magnetic circuit, M qqq  represents a change rate of the saturation coefficient of the q-axis magnetic circuit by I out   _   q , and (M qq +M qqq *|I out   _   q |) corresponds to a coefficient representing the degree of magnetic saturation of the q-axis by I out   _   q . Therefore, (M qq +M qqq *|I out   _   q |)*|I in   _   q +(C q30 +C q3 *|I out   _   q |)*I out   _   q | kqq  is a model equation representing a degree of change of the q-axis linkage magnetic flux by the magnetic saturation caused by the q-axis magnetomotive force, and corresponds to the degree of magnetic saturation of the q-axis by the q-axis magnetomotive force. The denominator on the right side of Equation (11) is a model equation representing a degree of change of the q-axis linkage magnetic flux by the magnetic saturation, and corresponds to the degree of magnetic saturation of the q-axis by the d-axis and q-axis magnetomotive forces. As a result, Equation (11) represents the q-axis linkage magnetic flux of the rotor winding  30  taking into consideration the magnetic interference between the magnetic flux of I in   _   q  and the magnetic flux by I out   _   q  in a case where the magnetic saturation occurs in the q-axis magnetic circuit. 
     The term f 0  in the denominator on the right side of Equation (11) can be represented by the following Equation (12) which is a function of the q-axis currents I in   _   q  and I out   _   q , because the d-axis magnetomotive force changes by the magnetic saturation of the d-axis magnetic circuit by the magnetic flux caused by the q-axis current. In Equation (12), C o10 , C o1 , C o20 , C o2 , C o30 , C o3 , C q40 , and C q4  are coefficients representing the degree of magnetic interference. Similarly, f m′3  in the numerator on the right side of Equation (11) can be represented by the following Equation (13) which is a function of the d-axis currents I in   _   d  and I out   _   d , because the q-axis magnetomotive force changes by the magnetic saturation of the q-axis magnetic circuit by the magnetic flux caused by the d-axis current. In Equation (13), C 31 , C 32 , C 33 , C 34 , and C d4  are coefficients representing the degree of the magnetic interference.
 
[Equation 5]
 
 f   0 =( C   o10   +C   o1   *|I   out   _   q |)+( C   o20   +C   o2   |I   out   _   q |)*exp{−( I   in   _   q +( C   q40   +C   q4   *|I   out   _   q |)* I   out   _   q ) 2 /( C   o30   +C   o3   *|I   out   _   q |)}  (12)
 
 f   m′3   =C   31   +C   32 *exp{−( I   in   _   d   +C   d4   *I   out   _   d   +C   34 ) 2   /C   33 }  (13)
 
     Similarly, in the second magnetic interference model, the d-axis linkage magnetic flux Φ out   _   d  of the stator winding  20  (model related to the d-axis linkage magnetic flux) can be represented by the following Equation (14), which is a function of I in   _   d , I in   _   q , I out   _   d , and I out   _   q . 
     
       
         
           
             
                 
             
             ⁢ 
             
               [ 
               
                 Equation 
                 ⁢ 
                 
                     
                 
                 ⁢ 
                 6 
               
               ] 
             
           
         
       
       
         
           
             
               
                 
                   
                     
                       Φ 
                       
                         in 
                         ⁢ 
                         _ 
                         ⁢ 
                         d 
                       
                     
                     ⁡ 
                     
                       ( 
                       
                         
                           I 
                           
                             in 
                             ⁢ 
                             _ 
                             ⁢ 
                             d 
                           
                         
                         , 
                         
                           I 
                           
                             in 
                             ⁢ 
                             _ 
                             ⁢ 
                             q 
                           
                         
                         , 
                         
                           I 
                           
                             out 
                             ⁢ 
                             _ 
                             ⁢ 
                             d 
                           
                         
                         , 
                         
                           I 
                           
                             out 
                             ⁢ 
                             _ 
                             ⁢ 
                             q 
                           
                         
                       
                       ) 
                     
                   
                   = 
                   
                     
                       
                         ( 
                         
                           
                             L 
                             d 
                           
                           + 
                           
                             
                               L 
                               dd 
                             
                             * 
                             
                                
                               
                                 I 
                                 
                                   in 
                                   ⁢ 
                                   _ 
                                   ⁢ 
                                   d 
                                 
                               
                                
                             
                           
                         
                         ) 
                       
                       * 
                       
                         ( 
                         
                           
                             I 
                             
                               out 
                               ⁢ 
                               _ 
                               ⁢ 
                               d 
                             
                           
                           - 
                           
                             
                               C 
                               
                                 d 
                                 ⁢ 
                                 
                                     
                                 
                                 ⁢ 
                                 2 
                               
                             
                             * 
                             
                               I 
                               
                                 in 
                                 ⁢ 
                                 _ 
                                 ⁢ 
                                 d 
                               
                             
                           
                           - 
                           
                             f 
                             
                               
                                 m 
                                 ′ 
                               
                               ⁢ 
                               2 
                             
                           
                         
                         ) 
                       
                     
                     
                       
                         
                           
                             1 
                             + 
                             
                               
                                 ( 
                                 
                                   
                                     M 
                                     dd 
                                   
                                   + 
                                   
                                     
                                       M 
                                       ddd 
                                     
                                     * 
                                     
                                        
                                       
                                         I 
                                         
                                           in 
                                           ⁢ 
                                           _ 
                                           ⁢ 
                                           d 
                                         
                                       
                                        
                                     
                                   
                                 
                                 ) 
                               
                               * 
                               
                                 
                                    
                                   
                                     
                                       I 
                                       
                                         out 
                                         ⁢ 
                                         _ 
                                         ⁢ 
                                         d 
                                       
                                     
                                     - 
                                     
                                       
                                         C 
                                         
                                           d 
                                           ⁢ 
                                           
                                               
                                           
                                           ⁢ 
                                           1 
                                         
                                       
                                       * 
                                       
                                         I 
                                         
                                           in 
                                           ⁢ 
                                           _ 
                                           ⁢ 
                                           d 
                                         
                                       
                                     
                                     - 
                                     
                                       f 
                                       
                                         
                                           m 
                                           ′ 
                                         
                                         ⁢ 
                                         1 
                                       
                                     
                                   
                                    
                                 
                                 kdd 
                               
                             
                             + 
                           
                         
                       
                       
                         
                           
                             
                               ( 
                               
                                 
                                   M 
                                   dq 
                                 
                                 + 
                                 
                                   
                                     M 
                                     dqd 
                                   
                                   * 
                                   
                                      
                                     
                                       I 
                                       
                                         in 
                                         ⁢ 
                                         _ 
                                         ⁢ 
                                         d 
                                       
                                     
                                      
                                   
                                 
                               
                               ) 
                             
                             * 
                             
                               
                                  
                                 
                                   
                                     I 
                                     
                                       out 
                                       ⁢ 
                                       _ 
                                       ⁢ 
                                       q 
                                     
                                   
                                   + 
                                   
                                     
                                       C 
                                       
                                         q 
                                         ⁢ 
                                         
                                             
                                         
                                         ⁢ 
                                         1 
                                       
                                     
                                     * 
                                     
                                       I 
                                       
                                         in 
                                         ⁢ 
                                         _ 
                                         ⁢ 
                                         q 
                                       
                                     
                                   
                                 
                                  
                               
                               kdq 
                             
                           
                         
                       
                     
                   
                 
               
               
                 
                   ( 
                   14 
                   ) 
                 
               
             
           
         
       
     
     In the numerator on the right side of Equation (14), (I out   _   d −C d2 *I in   _   d −f m′2 ) is a model equation related to the d-axis magnetomotive force in which I out   _   d  and I in   _   d  are combined with a setting ratio of 1:C d2 , and represents a total sum of the magnetomotive forces of the d-axis acting on the stator  16 , taking into consideration the magnetic interference between the magnetomotive force by I out   _   d  and the magnetomotive force by I in   _   d . The term L d  represents a d-axis inductance (I out   _   d =I in   _   d =0) of the PM motor unit, L dd  represents a change rate of the d-axis inductance of the PM motor unit by I in   _   d , and (L d +L dd *|I in   _   d |) represents the d-axis inductance of the PM motor unit at no load (I out   _   d =0). Therefore, the numerator on the right side of Equation (14) represents the d-axis linkage magnetic flux of the stator winding  20  taking into consideration the magnetic interference between the magnetic flux due to I out   _   d  and the magnetic flux due to I in   _   d  in a case where magnetic saturation does not occur in the d-axis magnetic circuit. 
     On the other hand, in the denominator on the right side of Equation (14), kdd is a constant unique to the PM motor unit, and I out   _   d −C d1 *I in   _   d −f m′1 | represents a magnitude of the total sum of the magnetomotive force of the d-axis. The term M dd  represents a saturation coefficient of the d-axis magnetic circuit, M ddd  represents a change rate of the saturation coefficient of the d-axis magnetic circuit by I in   _   d , and (M dd +M ddd *|I in   _   d |) corresponds to a coefficient representing a degree of magnetic saturation of the d-axis by I in   _   d . Therefore, (M dd +M ddd *|I in   _   d |)*|I out   _   d −C d1 *|I in   _   d f m′1 | kdd  is a model equation representing the degree of change of the d-axis linkage magnetic flux by the magnetic saturation caused by the d-axis magnetomotive force, and corresponds to the degree of magnetic saturation of the d-axis by the d-axis magnetomotive force. In addition, kdq is a constant unique to the PM motor unit, and |I out   _   q +C q1 *I in   _   q | represents the magnitude of the total sum of the magnetomotive forces of the q-axis taking into consideration the magnetic interference between the magnetomotive force due to I out   _   q  and the magnetomotive force due to I in   _   q . The term M dq  represents a saturation coefficient of the q-axis magnetic circuit, M dqd  represents a change rate of the saturation coefficient of the q-axis magnetic circuit by I in   _   d , and (M dq +M dqd *|I in   _   d |) corresponds to a coefficient representing the degree of magnetic saturation of the q-axis by I in   _   d . Therefore, (M dq +M dqd *|I in   _   d |)*|I out   _   q +C q1 *I in   _   q | kdq  is a model equation representing the degree of change of the d-axis linkage magnetic flux by the magnetic saturation caused by the q-axis magnetomotive force, and corresponds to the degree of magnetic saturation of the d-axis by the q-axis magnetomotive force. The denominator on the right side of Equation (14) is a model equation representing a degree of change of the d-axis linkage magnetic flux by the magnetic saturation, and corresponds to the degree of magnetic saturation of the d-axis by the d-axis and q-axis magnetomotive forces. As a result, Equation (14) represents the d-axis linkage magnetic flux of the stator winding  20  taking into consideration the magnetic interference between the magnetic flux due to I out   _   d  and the magnetic flux due to I in   _   d  in a case where the magnetic saturation occurs in the d-axis magnetic circuit. 
     The term f m′1  in the denominator on the right side of Equation (14) can be represented by the following Equation (15), which is a function of the q-axis currents I in   _   q  and I out   _   q , because the d-axis magnetomotive force changes by the magnetic saturation of the d-axis magnetic circuit by the magnetic flux caused by the q-axis current. Similarly, f m′2  in the numerator on the right side of Equation (14) can also be represented by the following Equation (16), which is a function of the q-axis currents I in   _   q  and I out   _   q . In Equations (15) and (16), f m′1  and f m′2  are functions of (I out   _   q +C q1 *I in   _   q ) which represents the total sum of the magnetomotive force of the q-axis.
 
[Equation 7]
 
 f   m′1   =C   11   +C   12 *exp{−( I   out   _   q   +C   q1   *I   in   _   q ) 2   /C   13 }  (15)
 
 f   m′2   =C   21   +C   22 *exp{−( I   out   _   q   +C   q1   *I   in   _   q ) 2   /C   23 }  (16)
 
     Similarly, in the second magnetic interference model, the q-axis linkage magnetic flux Φ out   _   q  of the stator winding  20  (model related to the q-axis linkage magnetic flux) can be represented by the following Equation (17), which is a function of I in   _   d , I in   _   q , I out   _   d , and I out   _   q . 
     
       
         
           
             
                 
             
             ⁢ 
             
               [ 
               
                 Equation 
                 ⁢ 
                 
                     
                 
                 ⁢ 
                 8 
               
               ] 
             
           
         
       
       
         
           
             
               
                 
                   
                     
                       Φ 
                       
                         in 
                         ⁢ 
                         _ 
                         ⁢ 
                         q 
                       
                     
                     ⁡ 
                     
                       ( 
                       
                         
                           I 
                           
                             in 
                             ⁢ 
                             _ 
                             ⁢ 
                             d 
                           
                         
                         , 
                         
                           I 
                           
                             in 
                             ⁢ 
                             _ 
                             ⁢ 
                             q 
                           
                         
                         , 
                         
                           I 
                           
                             out 
                             ⁢ 
                             _ 
                             ⁢ 
                             d 
                           
                         
                         , 
                         
                           I 
                           
                             out 
                             ⁢ 
                             _ 
                             ⁢ 
                             q 
                           
                         
                       
                       ) 
                     
                   
                   = 
                   
                     
                       
                         ( 
                         
                           
                             L 
                             q 
                           
                           + 
                           
                             
                               L 
                               qq 
                             
                             * 
                             
                                
                               
                                 I 
                                 
                                   in 
                                   ⁢ 
                                   _ 
                                   ⁢ 
                                   q 
                                 
                               
                                
                             
                           
                         
                         ) 
                       
                       * 
                       
                         ( 
                         
                           
                             I 
                             
                               out 
                               ⁢ 
                               _ 
                               ⁢ 
                               q 
                             
                           
                           - 
                           
                             
                               I 
                               
                                 in 
                                 ⁢ 
                                 _ 
                                 ⁢ 
                                 q 
                               
                             
                             * 
                             
                               f 
                               
                                 
                                   m 
                                   ′ 
                                 
                                 ⁢ 
                                 3 
                               
                             
                           
                         
                         ) 
                       
                     
                     
                       
                         
                           
                             1 
                             + 
                             
                               
                                 ( 
                                 
                                   
                                     M 
                                     qd 
                                   
                                   + 
                                   
                                     
                                       M 
                                       qdq 
                                     
                                     * 
                                     
                                        
                                       
                                         I 
                                         
                                           in 
                                           ⁢ 
                                           _ 
                                           ⁢ 
                                           q 
                                         
                                       
                                        
                                     
                                   
                                 
                                 ) 
                               
                               * 
                               
                                 
                                    
                                   
                                     
                                       I 
                                       
                                         out 
                                         ⁢ 
                                         _ 
                                         ⁢ 
                                         d 
                                       
                                     
                                     + 
                                     
                                       
                                         C 
                                         
                                           d 
                                           ⁢ 
                                           
                                               
                                           
                                           ⁢ 
                                           3 
                                         
                                       
                                       * 
                                       
                                         I 
                                         
                                           in 
                                           ⁢ 
                                           _ 
                                           ⁢ 
                                           d 
                                         
                                       
                                     
                                     - 
                                     
                                       f 
                                       0 
                                     
                                   
                                    
                                 
                                 kqd 
                               
                             
                             + 
                           
                         
                       
                       
                         
                           
                             
                               ( 
                               
                                 
                                   M 
                                   qq 
                                 
                                 + 
                                 
                                   
                                     M 
                                     qqq 
                                   
                                   * 
                                   
                                      
                                     
                                       I 
                                       
                                         in 
                                         ⁢ 
                                         _ 
                                         ⁢ 
                                         q 
                                       
                                     
                                      
                                   
                                 
                               
                               ) 
                             
                             * 
                             
                               
                                  
                                 
                                   
                                     I 
                                     
                                       out 
                                       ⁢ 
                                       _ 
                                       ⁢ 
                                       q 
                                     
                                   
                                   + 
                                   
                                     
                                       ( 
                                       
                                         
                                           C 
                                           
                                             q 
                                             ⁢ 
                                             
                                                 
                                             
                                             ⁢ 
                                             30 
                                           
                                         
                                         + 
                                         
                                           
                                             C 
                                             
                                               q 
                                               ⁢ 
                                               
                                                   
                                               
                                               ⁢ 
                                               3 
                                             
                                           
                                           * 
                                           
                                              
                                             
                                               I 
                                               
                                                 in 
                                                 ⁢ 
                                                 _ 
                                                 ⁢ 
                                                 q 
                                               
                                             
                                              
                                           
                                         
                                       
                                       ) 
                                     
                                     * 
                                     
                                       I 
                                       
                                         in 
                                         ⁢ 
                                         _ 
                                         ⁢ 
                                         q 
                                       
                                     
                                   
                                 
                                  
                               
                               kqq 
                             
                           
                         
                       
                     
                   
                 
               
               
                 
                   ( 
                   17 
                   ) 
                 
               
             
           
         
       
     
     In the numerator on the right side in Equation (17), f m′3  represents the degree of magnetic interference of the magnetomotive force due to I in   _   q  on the magnetomotive force due to I out   _   q , and represents the influence by the magnetomotive force of the permanent magnet  33 . The term (I out   _   q −I in   _   q *f m′3 ) is a model equation related to the q-axis magnetomotive force in which I out   _   q  and I in   _   q  are combined with a setting ratio of 1:f m′3 , and represents the total sum of the magnetomotive forces of the q-axis acting on the stator  16 , taking into consideration the magnetic interference between the magnetomotive force due to I out   _   q  and the magnetomotive force due to I in   _   q . The term L q  represents the q-axis inductance (I out   _   q =I in   _   q =0) of the PM motor unit, L qq  represents a change rate of the q-axis inductance of the PM motor unit by I in   _   q , and (L q +L qq *|I in   _   q |) represents the q-axis inductance of the PM motor unit at no load (I out   _   q =0). Therefore, the numerator on the right side of Equation (17) represents the q-axis linkage magnetic flux of the stator winding  20  taking into consideration the magnetic interference between the magnetic flux due to I out   _   q  and the magnetic flux due to I in   _   q  in a case where the magnetic saturation does not occur in the q-axis magnetic circuit. 
     Meanwhile, in the denominator of the right side of Equation (17), kqd is a constant unique to the PM motor unit, and |I out   _   d +C d3 *I in   _   d −f 0 | represents a magnitude of a total sum of the magnetomotive forces of the d-axis. The term M qd  represents a saturation coefficient of the d-axis magnetic circuit, M qdq  represents a change rate of the saturation coefficient of the d-axis magnetic circuit by I in   _   q , and (M qd +M qdq *|I in   _   q |) corresponds to a coefficient representing the degree of magnetic saturation of the d-axis by I in   _   q . Therefore, (M qd +M qdq *|I in   _   q |)*|I out   _   d +C d3 *I in   _   d −f 0 | kqd  is a model equation representing the degree of change of the q-axis linkage magnetic flux by the magnetic saturation caused by the d-axis magnetomotive force, and corresponds to the degree of magnetic saturation of the q-axis by the d-axis magnetomotive force. In addition, kqq is a constant unique to the PM motor unit, and |I out   _   q +(C q30 +C q3 *|I in   _   q |)*I in   _   q | represents a magnitude of the total sum of the magnetomotive forces of the d-axis. The term M qq  represents a saturation coefficient of the q-axis magnetic circuit, M qqq  represents a change rate of the saturation coefficient of the q-axis magnetic circuit by I in   _   q , and (M qq +M qqq *|I in   _   q |) corresponds to a coefficient representing the degree of magnetic saturation of the q-axis by I in   _   q . Therefore, (M qq +M qqq *|I in   _   q |)*|I out   _   q +(C q30 +C q3 *|I in   _   q |)*I in   _   q | kqq  is a model equation representing a degree of change of the q-axis linkage magnetic flux by the magnetic saturation caused by the q-axis magnetomotive force, and corresponds to the degree of the magnetic saturation of the q-axis by the q-axis magnetomotive force. The denominator on the right side of Equation (17) is a model equation representing a degree of change of the q-axis linkage magnetic flux by the magnetic saturation, and corresponds to the degree of magnetic saturation of the q-axis by the d-axis and q-axis magnetomotive forces. As a result, Equation (17) represents the q-axis linkage magnetic flux of the stator winding  20  taking into consideration the magnetic interference between the magnetic flux due to I out   _   q  and the magnetic flux due to I in   _   q  in a case where the magnetic saturation occurs in the q-axis magnetic circuit. 
     The term f 0  in the denominator on the right side of Equation (17) can be represented by the following Equation (18), which is a function of the q-axis currents I in   _   q  and I out   _   q , because the d-axis magnetomotive force changes by the magnetic saturation of the d-axis magnetic circuit by the magnetic flux caused by the q-axis current. Similarly, f m′3  in the numerator on the right side of Equation (17) can be represented by the following Equation (19), which is a function of the d-axis currents I in   _   d  and I out   _   d , because the q-axis magnetomotive force changes by the magnetic saturation of the q-axis magnetic circuit by the magnetic flux caused by the d-axis current.
 
[Equation 9]
 
 f   0 =( C   o10   +C   o1   *|I   in   _   q |)+( C   o20   +C   o2   *|I   in   _   q |)*exp{−( I   out   _   q +( C   q40   +C   q4   *|I   in   _   q |) 2 /( C   o30   +C   o3   *|I   in   _   q |)}  (18)
 
 f   m′3   =C   31   +C   32 *exp{−( I   out   _   d   +C   d4   *I   in   _   d   +C   34 ) 2   /C   33 }  (19)
 
       FIG. 11  is a flowchart showing an example process executed by the information processing device  70 . In step S 101 , a combination of torque command values (T in   _   ref  and T out   _   ref ) is set. In step S 102 , as a constraint condition, a condition is set by the current command value calculating unit  174  that the torque T m  is equal to the torque command value T in   _   ref  (T in =T in   _   ref ) and the torque T out  is equal to the torque command value T out   _   ref  (T out =T out   _   ref ) is obtained by substituting Φ in   _   d  of Equation (8) and Φ in   _   q  of Equation (11) (first magnetic interference model) into Equation (1), T out  is obtained by substituting Φ out   _   d  of Equation (14) and Φ out   _   q  of Equation (17) (second magnetic interference model) into Equation (2), and T in  and T out  are functions of I=(I in   _   d , I in   _   q , I out   _   d , I out   _   q ). 
     In step S 103 , the current command value calculating unit  174  calculates a combination of the currents (I in   _   d , I in   _   q , I out   _   d , and I out   _   q ) that minimizes the evaluation function f representing the total copper loss of the rotor winding  30  and the stator winding  20 , within the range of the constraint condition which is set in step S 102 . The evaluation function f is represented by Equation (7) which is a function of I=(I in   _   d , I in   _   q , I out   _   d , I out   _   q ), and a process to calculate the value of the evaluation function f is repeated while changing the values of I in   _   d , I in   _   q , I out   _   d , and I out   _   q  within the range satisfying the constraint condition, to search for a combination of the currents (I in   _   d , I in   _   q , I out   _   d , and I out   _   q ) that minimizes the evaluation function f. As an algorithm for searching the current that minimizes the evaluation function f in this process, a known technique may be employed, and thus, the algorithm will not be described in detail. For example,  FIG. 12  shows the relationship of the evaluation function f with respect to the current I in  in the rotor winding  30  under the constraint condition of T in =T in   _   ref =0 and T out =T out   _   ref =90 Nm. In  FIG. 12  also, with regard to I in  on the horizontal axis, the value is normalized by dividing by I out  (current value which does not use the magnetic interference) that generates T out =90 Nm at I in =0. As shown in  FIG. 12 , with the use of the magnetic interference, there is a value of I in  where the evaluation function f becomes smaller compared to the case of I in =0 which does not use the magnetic interference, and, in the example configuration of  FIG. 12 , the evaluation function f is minimized with I in =0.34. In step S 104 , the combination of the currents (I in   _   d , I in   _   q , I out   _   d , and I out   _   q ) calculated in step S 103  is determined by the current command value calculating unit  174  as a combination of the current command values (I in   _   d   _   ref , I in   _   q   _   ref , I out   _   d   _   ref , and I out   _   q   _   ref ). 
     As the current command values I in   _   d   _   ref , I in   _   q   _   ref , I out   _   d   _   ref , and I out   _   q   _   ref  determined by the current command value calculating unit  174 , it is not necessary to set the currents I in   _   d , I in   _   q , I out   _   d , and I out   _   q  that minimize the evaluation function f. For example, values which are slightly larger (or slightly smaller) than the currents I in   _   d , I in   _   q , I out   _   d , and I out   _   q  which result in the minimum evaluation function f may be set as the current command values I in   _   d   _   ref , I in   _   q   _   ref , I out   _   d   _   ref , and I out   _   q   _   ref . 
     The combination of the current command values (I in   _   d   _   ref , I in   _   q   _   ref , I out   _   d   _   ref , and I out   _   q   _   ref ) calculated by the information processing device  70  (current command value calculating unit  174 ) is stored in correspondence to the combination of the torque command values (T in   _   ref  and T out   _   ref ) as the torque-current characteristic in the torque-current characteristic storage unit  137  of the electronic control unit  50 . In other words, the torque-current characteristic that minimizes (or approximately minimizes) the evaluation function f is stored in the torque-current characteristic storage unit  137 . In the rotor winding current controller  140  and the stator winding current controller  160  of the electronic control unit  50 , the current I in  in the rotor winding  30  and the current I out  in the stator winding  20  are respectively controlled based on the relationship of the current command values I in   _   q   _   ref  and I in   _   q   _   ref  for the rotor winding  30  and the current command values I out   _   d   _   ref  and I out   _   q   _   ref  for the stator winding  20  with respect to the torque command values T in   _   ref  and T out   _   ref , calculated by the information processing device  70  (current command value calculating unit  174 ). With this configuration, the torques T in  and T out  follow the torque command values T in   _   ref  and T out   _   ref , respectively, and the current I in  in the rotor winding  30  and the current I out  in the stator winding  20  are controlled so that the total copper loss of the rotor winding  30  and the stator winding  20  is minimum (or approximately minimum). 
     As described, in the rotary electric machine  10 , when the magnetic interference between the magnetic flux due to the current I in  in the rotor winding  30  and the magnetic flux due to the current I out  in the stator winding  20  is used, there are infinite combinations of the currents (I in  and I out ) for matching the torques T in  and T out  with the torque command values T in   _   ref  and T out   _   ref , respectively. In this regard, in the present embodiment, from the infinite combinations, a combination of the current command values (I in   _   d   _   ref , I in   _   q   _   ref , I out   _   d   _   ref ; and I out   _   q   _   ref ) that minimizes (or approximately minimizes) the total copper loss of the rotor winding  30  and the stator winding  20  can be selected using the first and second magnetic interference models. By controlling the current I in  in the rotor winding  30  and the current I out  in the stator winding  20  based on the current command values I in   _   ref , I out   _   d   _   ref , and I out   _   q   _   ref , it is possible to improve a power factor of the rotary electric machine  10  compared to the case where the magnetic interference is not used, and the loss by the copper loss of the rotary electric machine  10  can be reduced. 
     In the present embodiment, the electronic control unit  50  may also function as the information processing device  70 , and the process in the flowchart of  FIG. 11  may be executed by the electronic control unit  50 . In a functional block diagram of  FIG. 13 , the current command value setting unit  136  also functions as the current command value calculating unit  174 , and calculates the combination of the current command values (I in   _   d   _   ref , I in   _   q   _   ref , I out   _   d   _   ref , and I out   _   q   _   ref ) that minimizes (or approximately minimizes) the evaluation function f using the first and second magnetic interference models stored in the model storage unit  172 . In the rotor winding current controller  140  and the stator winding current controller  160 , the current I in  in the rotor winding  30  and the current I out  in the stator winding  20  are respectively controlled based on the current command values I in   _   d   _   ref  and I in   _   q   _   ref  for the rotor winding  30  and the current command values T out   _   d   _   ref  and I out   _   q   _   ref  for the stator winding  20  calculated by the current command value setting unit  136 . In this case, the torque-current characteristic storage unit  137  may be omitted. 
     As the constraint condition which is set in step S 102  in the flowchart of  FIG. 11 , in addition to the conditions of T in =T in   _   ref  and T out =T out   _   ref , other conditions may be added such as that the voltage V in  of the rotor winding  30  is less than or equal to a limit value (first limit value) V in   _   limit  (V in ≦V in   _   limit ) and that the voltage V out  of the stator winding  20  is less than or equal to a limit value (second limit value) V out   _   limit  (V out ≦V out   _   limit ). The voltage V in  can be obtained by substituting Φ in   _   d  of Equation (8) and Φ in   _   q  of Equation (11) (first magnetic interference model) into Equation (3), and is a function of I=(I in   _   d , I in   _   q , I out   _   d , I out   _   q ) and ω in  and ω out . The voltage V out  can be obtained by substituting Φ out   _   d  in Equation (14) and Φ out   _   q  in Equation (17) (second magnetic interference model) into Equation (2), and is a function of I and ω out . For ω in  and ω out , values detected by a rotational angular speed sensor are used, and the limit values V in   _   limit  and V out   _   limit  are set to values, for example, lower than the voltage of the electricity storage device  42 . By adding the constraint conditions of V in ≦V in   _   limit  and V out ≦V out   _   limit , it is possible to reduce the loss by the copper loss of the rotary electric machine  10  while inhibiting the counter electromotive force of the rotor winding  30  and the counter electromotive force of the stator winding  20 . 
     Alternatively, as the constraint condition, conditions may be added that the current I in  in the rotor winding  30  is less than or equal to a limit value (third limit value) I in   _   limit ≦I in   _   limit ) and that the current I out  in the stator winding  20  is less than or equal to a limit value (fourth limit value) I out   _   limit  (I out ≦I out   _   limit ). The current I in  is represented by Equation (5), which is a function of I in   _   d  and I in   _   q , and the current I out  is represented by Equation (6) which is a function of I out   _   d  and I out   _   q . The limit value I in   _   limit  is set, for example, to a value less than a capacity of the inverter  41 , and the limit value I out   _   limit  is set, for example, to a value less than a capacity of the inverter  40 . By adding the constraint conditions of I in ≦I in   _   limit  and I out ≦I out   _   limit , it is possible to reduce the loss by the copper loss of the rotary electric machine  10  while inhibiting the current I in  in the rotor winding  30  and the current I out  in the stator winding  20 . 
     Alternatively, as the constraint conditions, conditions may be added that V in ≦V in   _   limit  and I in ≦I in   _   limit . With such a configuration, the loss by the copper loss of the rotary electric machine  10  can be reduced while inhibiting the counter electromotive force of the rotor winding  30  and the current I in . Alternatively, as the constraint conditions, the conditions of V out ≦V out   _   limit  and I out ≦I out   _   limit  may be added. With such a configuration, the loss by the copper loss of the rotary electric machine  10  can be reduced while inhibiting the counter electromotive force of the stator winding  20  and the current I out . 
     Alternatively, in the evaluation function f of Equation (7) representing the total copper loss of the rotor winding  30  and the stator winding  20 , the phase resistance R out  of the rotor winding  30  and the phase resistance R out  of the stator winding  20  may be changed according to a temperature τ in  of the rotor winding  30  and the temperature T out  of the stator winding  20 , respectively. In this case, as shown in  FIG. 13 , a rotor winding temperature sensor  81  which detects the temperature τ out  of the rotor winding  30  and a stator winding temperature sensor  82  which detects the temperature τ out  of the stator winding  20  are provided in the rotary electric machine  10 . In the current command value setting unit  136 , the phase resistance R in  of the rotor winding  30  is set based on the temperature τ in  of the rotor winding  30  detected by the rotor winding temperature sensor  81 , and the phase resistance R out  of the stator winding  20  is set based on the temperature τ out  of the stator winding  20  detected by the stator winding temperature sensor  82 . The value of the evaluation function f is calculated using the phase resistances R in  and R out  which are set based on the temperatures τ in  and τ out . According to such an example structure, the copper loss of the rotary electric machine  10  which changes according to the temperature τ in  of the rotor winding  30  and the temperature τ out  of the stator winding  20  can be more precisely minimized. 
     The first and second magnetic interference models are not limited to those described above, and various modifications and simplifications are possible. For example, the denominator on the right side of Equation (8) may be simplified by setting kdd=1 and kdq=1, and, the denominator on the right side of Equation (11) may be simplified by setting kqd=1 and kqq=1. Similarly, the denominator on the right side of Equation (14) may be simplified by setting kdd=1 and kdq=1, and the denominator on the right side of Equation (17) may be simplified by setting kqd=1 and kqq=1. 
     Moreover, in Equations (9), (10), (12), and (13), the part of the exponential function may be approximated by a polynomial equation. Alternatively, each of f m′1 , f m′2 , and f 0  may be simplified to a constant assuming that the d-axis magnetomotive force by the magnetomotive force of the permanent magnet  33  is a constant, and f m′3  may be simplified to a constant assuming that the degree of the magnetic interference of the magnetomotive force due to I out   _   q  on the magnetomotive force due to I in   _   q  is constant. 
     In addition, assuming that, from  FIGS. 5-8 , the degree of magnetic interference at the q-axis between the magnetomotive force due to I in   _   q  and the magnetomotive force due to I out   _   q  is sufficiently small compared to the degree of magnetic interference at the d-axis between the magnetomotive force due to I in   _   d  and the magnetomotive force due to I out   _   d , it is possible to simplify the denominator on the right side of Equation (8) by setting C q1 =0, simplify the denominator on the right side of Equation (11) by setting C q3 =C q30 =0, and simplify the numerator on the right side of Equation (11) by setting f m′3 =0. Similarly, the denominator on the right side of Equation (14) may be simplified by setting C q1 =0, the denominator on the right side of Equation (17) may be simplified by setting C q3 =C q30 =0, and the numerator on the right side of Equation (17) may be simplified by setting f m′3 =0. 
     Moreover, the numerator of the right side of Equation (8) may be simplified by setting L dd =0 assuming that the d-axis inductance of the induction electromagnetic coupling unit is constant, and the numerator on the right side of Equation (11) may be simplified by setting L qq =0 assuming that the q-axis inductance of the induction electromagnetic coupling unit is a constant. Similarly, the numerator on the right side of Equation (14) may be simplified by setting L dd =0 assuming that the d-axis inductance of the PM motor unit is a constant, and the numerator on the right side of Equation (17) may be simplified by setting L qq =0 assuming that the q-axis inductance of the PM motor unit is a constant. 
     Furthermore, the denominator on the right side of Equation (8) may be simplified by setting M ddd =0 assuming that the saturation coefficient of the d-axis magnetic circuit is a constant, and by setting M dqd =0 assuming that the saturation coefficient of the q-axis magnetic circuit is a constant. The denominator on the right side of Equation (11) may be simplified by setting M qdq =0 assuming that the saturation coefficient of the d-axis magnetic circuit is a constant, and by setting M cm =0 assuming that the saturation coefficient of the q-axis magnetic circuit is a constant. Similarly, the denominator on the right side of Equation (14) may be simplified by setting M ddd =0 assuming that the saturation coefficient of the d-axis magnetic circuit is a constant, and by setting M dqd =0 assuming that the saturation coefficient of the q-axis magnetic circuit is a constant. The denominator on the right side of Equation (17) may be simplified by setting M qdq =0 assuming that the saturation coefficient of the d-axis magnetic circuit is a constant, and by setting M qqq =0 assuming that the saturation coefficient of the q-axis magnetic circuit is a constant. 
     Further, the denominator on the right side of Equation (8) may be simplified by setting M dq =M dqd =0 assuming that the influence of the q-axis magnetomotive force on the magnetic saturation of the d-axis is sufficiently small compared to the d-axis magnetomotive force, and the denominator on the right side of Equation (11) may be simplified by setting M qd =M qdq =0 assuming that the influence of the d-axis magnetomotive force on the magnetic saturation of the q-axis is sufficiently small compared to the q-axis magnetomotive force. Similarly, the denominator on the right side of Equation (14) may be simplified by setting M dq =M dqd =0 assuming that the influence of the q-axis magnetomotive force on the magnetic saturation of the d-axis is sufficiently small compared to the d-axis magnetomotive force, and the denominator on the right side of Equation (17) may be simplified by setting M qd =M qdq =0 assuming that the influence of the d-axis mangetomotive force on the magnetic saturation of the q-axis is sufficiently small compared to the q-axis magnetomotive force. 
     Further, the denominator on the right side of Equation (8) may be simplified to 1 by setting (M dd =M ddd =M dq =M dqd =0) by not taking into consideration the magnetic saturation of the d-axis, and the denominator on the right side of Equation (11) may be simplified to 1 by setting (M qd =M qdq =M qq =M qqq =0) by not taking into consideration the magnetic saturation of the q-axis. Similarly, the denominator on the right side of Equation (14) may be simplified to 1 by not taking into consideration the magnetic saturation of the d-axis, and the denominator on the right side of Equation (17) may be simplified to 1 by not taking into consideration the magnetic saturation of the q-axis. 
     The first and second magnetic interference models are not limited to the equation models described above, and may be, for example, in the form of a map of each linkage magnetic flux for each current which can be obtained by magnetic field analysis or a rational function model in which the denominator and the numerator are represented with polynomial equations of an arbitrary order with respect to each current. 
     Furthermore, the rotary electric machine  10  is not particularly limited to the structure described above or a magnet placement structure such as the structure of FIG. 6 of Patent Document 3, so long as the linkage magnetic flux of the stator winding  20  can be adjusted by the current in the rotor winding  30  and the linkage magnetic flux of the rotor winding  30  can be adjusted by the current in the stator winding  20 . For example, with regard to the permanent magnet  33  placed between soft magnetic members  53  adjacent in the circumferential direction of the rotor, as shown in  FIG. 14 , a placement may be employed in which an inclination angle of the magnetic pole surface with respect to the radial direction is 90°.  FIG. 14  also shows the flow of the field magnetic flux by the permanent magnet  33 , similar to  FIG. 4 . Alternatively, the magnetic pole surfaces of the permanent magnets  33  may be placed along the radial direction. 
     Alternatively, as shown in  FIGS. 15-18 , for example, a configuration may be employed in which an axial type rotary electric machine  10  is provided in which the output-side rotor  18  opposes the input-side rotor  28  and the stator  16  in the rotor rotational axis direction.  FIG. 15  shows an example structure of the axial type rotary electric machine  10 ,  FIG. 16  shows an example structure of the stator  16 ,  FIG. 17  shows an example structure of the input-side rotor  28 , and  FIG. 18  shows an example structure of the output-side rotor  18 . Each of the plurality of soft magnetic members  53  placed in a divided manner in the circumferential direction of the rotor with an equal space therebetween comprises a lower surface (first surface)  61  which opposes the input-side rotor  28  (teeth  52   a ) with a predetermined gap therebetween, an upper surface (second surface)  62  which opposes the stator  16  (teeth  51   a ) with a predetermined gap therebetween, a side surface (third surface)  63  which faces (contacts) a magnetic pole surface of one permanent magnet  33  of adjacent permanent magnets  33 , and a side surface (fourth surface)  64  which faces (contacts) the magnetic pole surface of the other permanent magnet  33  of the adjacent permanent magnets  33 . In the example configuration of  FIG. 18 , the magnetic pole surface of each permanent magnet  33  is placed along the radial direction. 
     In addition, in the output-side rotor  18 , for example, as shown in  FIG. 19 , a non-magnetic member  35  may be provided in place of the permanent magnet  33 . In the example configuration of  FIG. 19 , the plurality of soft magnetic members  53  are placed in a divided manner in the circumferential direction of the rotor with a space therebetween (with equal space). A plurality (same number as that of the soft magnetic members  53 ) of non-magnetic members  35  are placed in the circumferential direction of the rotor with a space therebetween (with equal space), and each non-magnetic member  35  is placed between soft magnetic members  53  adjacent in the circumferential direction of the rotor. Each of the soft magnetic members  53  placed between the non-magnetic members  35  adjacent in the circumferential direction of the rotor comprises an inner circumferential surface (first surface)  61  which opposes the input-side rotor  28  (teeth  52   a ) with a predetermined gap therebetween, an outer circumferential surface (second surface)  62  which opposes the stator  16  (teeth  51   a ) with a predetermined gap therebetween, a side surface (third surface)  63  which faces (contacts) one non-magnetic member  35  of the adjacent non-magnetic members  35 , and a side surface (fourth surface)  64  which faces (contacts) the other non-magnetic member  35  of the adjacent non-magnetic members, and a magnetic flux passes between the inner circumferential surface  61  and the outer circumferential surface  62 . In place of the non-magnetic member  35 , it is also possible to provide a gap. Alternatively, the soft magnetic members  53  adjacent in the circumferential direction of the rotor may be connected to each other by a bridge. 
     As shown in  FIG. 19 , the d-axis magnetic flux due to the d-axis current in the rotor winding  30  flows between the inner circumferential surface  61  and the outer circumferential surface  62  of the soft magnetic member  53 , and acts on the stator  16 , to affect the linkage magnetic flux to the stator winding  20 . Because of this, the d-axis magnetic flux due to the d-axis current in the rotor winding  30  acts, for the stator  16 , similar to the field magnetic flux when the permanent magnet  33  is provided in the position of the non-magnetic member  35 . Therefore, the linkage magnetic flux of the stator winding  20  can be adjusted by the current in the rotor winding  30 . Similarly, the d-axis magnetic flux due to the d-axis current in the stator winding  20  flows between the outer circumferential surface  62  and the inner circumferential surface  61  of the soft magnetic member  53  and acts on the input-side rotor  28 , to affect the linkage magnetic flux to the rotor winding  30 . Because of this, the d-axis magnetic flux due to the d-axis current in the stator winding  20  acts, for the input-side rotor  28 , similarly as the field magnetic flux when the permanent magnet  33  is provided at the position of the non-magnetic member  35 . Therefore, the linkage magnetic flux of the rotor winding  30  can be adjusted by the current in the stator winding  20 . 
     For the first and second magnetic interference models when the non-magnetic member  35  or the gap is provided in place of the permanent magnet  33 , it is possible to consider a configuration where f m′1 =f m′2 =f 0 =0 in the above description. 
     A preferred embodiment of the present invention has been described. The present invention, however, is not limited to the embodiment in any ways, and various modifications are possible within the scope and spirit of the present invention. 
     EXPLANATION OF REFERENCE NUMERALS 
       10  ROTARY ELECTRIC MACHINE;  16  STATOR;  18  OUTPUT-SIDE ROTOR (SECOND ROTOR);  20  STATOR WINDING;  28  INPUT-SIDE ROTOR (FIRST ROTOR);  30  ROTOR WINDING;  33  PERMANENT MAGNET;  35  NON-MAGNETIC MEMBER;  36  ENGINE;  37  DRIVE SHAFT;  38  WHEEL;  40 ,  41  INVERTER;  42  ELECTRICITY STORAGE DEVICE;  44  TRANSMISSION;  50  ELECTRONIC CONTROL UNIT;  51  STATOR CORE;  52  ROTOR CORE;  53  SOFT MAGNETIC MEMBER;  54  GAP;  61  INNER CIRCUMFERENTIAL SURFACE (FIRST SURFACE);  62  OUTER CIRCUMFERENTIAL SURFACE (SECOND SURFACE);  63 ,  64  SIDE SURFACE (THIRD SURFACE, FOURTH SURFACE);  70  INFORMATION PROCESSING DEVICE;  81  ROTOR WINDING TEMPERATURE SENSOR;  82  STATOR WINDING TEMPERATURE SENSOR;  95  SLIP RING;  96  BRUSH;  135  COUPLING TORQUE COMMAND VALUE CALCULATING UNIT;  136  CURRENT COMMAND VALUE SETTING UNIT;  137  TORQUE-CURRENT CHARACTERISTIC STORAGE UNIT;  140  ROTOR WINDING CURRENT CONTROLLER;  155  MG TORQUE COMMAND VALUE CALCULATING UNIT;  160  STATOR WINDING CURRENT CONTROLLER;  172  MODEL STORAGE UNIT;  174  CURRENT COMMAND VALUE CALCULATING UNIT.