Patent Publication Number: US-9419497-B2

Title: Double-rotor motor

Description:
TECHNICAL FIELD 
     The present invention relates to a double rotor type motor, in which a heat dissipation unit is provided in a rotor, to thus enhance heat dissipation performance of a stator, and a Hall sensor assembly mounting structure is improved, to thus reduce manufacturing costs and enable mass production. 
     BACKGROUND ART 
     In general, motors are applied to washing machines, water pumps for vehicles, and the like, and provide power by their rotational motions. Typically, a washing machine receives power of a drive motor located on the bottom of a basket and rotates. The power of the drive motor is transferred to a rotating axis of a load, in which the output shaft of the drive motor is indirectly connected to the rotating axis through a belt, or the output shaft of the drive motor is directly connected to the rotating axis. In recent years, in order to reduce noise, breakdown, and energy waste, and to improve the overall strength of a rotor, and further to promote improvement of a washing function, motors employing a direct connecting mode of a double rotor structure have been in the spotlight. 
       FIG. 1  is a cross-sectional view of a conventional motor structure for a full-automatic washing machine. The conventional motor rotationally drives a basket and an inner tub of the full-automatic washing machine, and includes: a stator  10  having a large number of cores  11  wound with a coil  12 ; inner and outer rotors  20   a  and  20   b  that are interconnected by a rotor support  23  and that are rotated by a magnetic circuit that is formed when electric power is applied to the coil  12  of the stator  10 , in which inner and outer permanent magnets  22   a  and  22   b  are mounted in inner and outer back yokes  21   a  and  21   b ; and a rotating axis that is combined at the central portion of a support frame  24  that is extended and formed on the inner circumference of the rotor support  23 . 
     In addition, a holder  31  having connectors for connection to a control board (not shown), that is, a driver of the motor is provided at one side of the stator  10 . Here, connectors for connection of the holder  31  include a power feeding connector for applying power to the stator  10 , and a position signal transmitting connector that is connected to a Hall sensor substrate  33  provided with Hall sensors  34 , thus transmitting position signals of the rotors  20   a  and  20   b . The connectors for connection of the holder  31  are connected to the outside through lead wires  32 . 
     Meanwhile, if the control board of the motor receives the position signals of the rotors  20   a  and  20   b  detected by the Hall sensors  34 , the control board discriminates the rotational speeds of the rotors  20   a  and  20   b , compares the rotational speeds of the rotors  20   a  and  20   b  with predetermined target speeds, and controls the rotors  20   a  and  20   b  to rotate at the target speeds with a three-phase (that is, U-phase, V-phase, and W-phase) timing signal, depending on the comparison results. Specifically, the control board of the motor transfers pulse waveform generated by combination of the Hall sensors  34  to a drive unit, and selectively switches a switching transistor corresponding to each phase, to thus control a power which is supplied to each phase coil of the stator  10  from a power supply to thereby make the motor driven. Here, the stator  10  is configured to have nine coils  12 , in which three coils are assigned to each of the U-phase, V-phase, and W-phase and connected in series, to then make three-phase coils connected to have a Y-connection structure. In this case, when the position signals of the rotors  20   a  and  20   b  are sequentially detected by the three Hall sensors  34 , the control board of the motor sequentially applies the power to the two-phase coils  12  among the three-phase coils  12  at a certain angle, to thus make the switching transistor driven. In other words, a three-phase motor has three-phase end points that are connected to each other, and repeats three processes of making the current flow in one direction, the current flow in the other direction, and then the current turned off, from the standpoint of one phase. 
     In particular, the Hall sensors  34  are composed of a lead type, respectively. These lead type Hall sensors  34  are connected on the Hall sensor substrate  33  in which one end of the long lead is inserted into the Hall sensor substrate  33  and then manually soldered. In this case, the Hall sensor substrate  33  on which the Hall sensors  34  are mounted requires peripheral components, such as resistors, capacitors, around integrated circuit (IC) chips that generate the position detection signals of the rotors  20   a  and  20   b , and has essentially a need to perform a surface mount work. However, the conventional Hall sensor mounting structure requires that the Hall sensors  34  should be protruded in a direction perpendicular to the Hall sensor substrate  33  and arranged at the side surface of the inner rotor or outer rotor, in order to detect the rotational positions of the rotors  20   a  and  20   b , since the Hall sensor substrate  33  is disposed in a horizontal direction at one side surface of the stator  10  along the circumferential direction of the motor. Therefore, according to the conventional art, long lead type Hall sensors  34  are mounted on the Hall sensor substrate  33 , and one end of the long lead is manually soldered since it is not nearly possible to perform a surface mounting work. As a result, since the Hall sensors  34  may be seceded from the Hall sensor substrate  33  due to the bad soldering, and thus the poor contact may occur, there is a limit to have good reliability between the Hall sensors  34  and the Hall sensor substrate  33 . 
     In addition, the Hall sensor substrate  33  is coupled at a state where the Hall sensors  34  have been inserted into Hall sensor insertion holes provided on the stator  10 . The conventional Hall sensor mounting and assembling structures go through a manual insertion and assembly process of directly inserting Hall sensors on a Hall sensor substrate or requiring a separate soldering process. As a result, such a manual insertion and assembly process may cause a motor production cost to rise, and make mass production difficult. Thus, the Hall sensor substrate  33  needs to be made into a structure of being coupled to the stator  10  to facilitate mass production. 
     In addition, the holder  32  is manufactured into a structure of integrating power feeding connectors with position signal transmission connectors and thus when any one connector is out of order, all connectors need to be replaced to thereby cause unnecessary costs. 
     In addition, the conventional rotor has a structure that the back yokes  21   a  and  21   b  are inserted into the rotor support  23  that accommodates the stator and then the permanent magnets  22   a  and  22   b  are fixedly coupled on the back yokes  21   a  and  21   b . In this case, the stator  10  always emits heat from the coils wound on the stator  10  when power is applied to the coils for rotation of the rotor, and accordingly a heat dissipation structure is required to ensure stability of a motor-driven environment. In particular, in the case of a double-rotor type motor, the inner rotor  20   b  and the outer rotor  20   a  are provided, to thus emit heat of hotter temperature than one rotor type motor when power is applied to the coils  12 . As a result, needs on the heat dissipation structure in the double-rotor type motor are even greater than those of the mono-rotor type motor. 
     Conventionally, in order to implement such as a heat dissipation structure, height of the stacked stator core  11  is heightened, or capacities of the permanent magnets  22   a  and  22   b  in the rotor are enlarged, to thereby increase the torque of the motor, and to thus minimize the load of the stator coils  12  to suppress the amount of heat generated. 
     However, the conventional motor has no heat dissipation structure of dissipating heat generated from the stator coils, to thus degrade performance of the motor and shorten the life span of the motor. 
     SUMMARY OF THE INVENTION 
     To solve the above problems or defects, it is an object of the present invention to provide a double-rotor type motor in which a heat dissipation unit that can forcibly ventilate outer air into a stator during rotation of a rotor is provided in a rotor support, to thereby enhance heat dissipation efficiency. 
     It is another object of the present invention to provide a double-rotor type motor in which a heat dissipation unit is integrally formed on a rotor support, with no need to have a separate heat dissipation unit for dissipating heat generated from a stator, to thereby reduce a manufacturing cost. 
     It is still another object of the present invention to provide a double-rotor type motor in which Hall sensors are surface-mounted on a Hall sensor substrate together with other parts to be mounted on the Hall sensor substrate, and a Hall sensor assembly is provided in a stator support in which the Hall sensor assembly couples the Hall sensors in a vertical direction parallel to an axial direction so that the Hall sensor substrate faces an inner or outer rotor, to thereby reduce a manufacturing cost, improve productivity, and achieve mass production. 
     The objects of the present invention are not limited to the above-described objects, and other objects and advantages of the present invention can be appreciated by the following description and will be understood more clearly by embodiment of the present invention. In addition, it will be appreciated that the objects and advantages of the present invention will be easily realized by means shown in the appended patent claims, and combinations thereof. 
     To accomplish the above and other objects of the present invention, according to an aspect of the present invention, there is provided a double-rotor type motor comprising: a stator; a double-rotor that is positioned at a certain gap on an outer surface and an inner surface of the stator; a rotor support on which the double-rotor is integrally formed and a plurality of air passages are radially penetratively formed; and a heat dissipation unit that is integrally formed with the rotor support and that forcibly ventilates outer air into the air passages during rotation of the rotor, to thereby dissipate heat generated from the stator. 
     Preferably but not necessarily, the heat dissipation unit comprises: outer blades that are formed on an outer surface of the rotor support and that ventilate outer air into the air passages during rotation of the rotor; and inner blades that are formed on an inner surface of the rotor support and that ventilate air introduced via the air passages to the stator. 
     Preferably but not necessarily, the outer blades are protrudingly formed vertically on outer surfaces of support ribs that partition the air passages, and that are radially arranged. 
     Preferably but not necessarily, guide protrusions are respectively formed at one side of each outer blade in order to guide the air ventilated by the outer blades to the air passages. 
     Preferably but not necessarily, the guide protrusions are extended in the circumferential direction from both sides of each outer blade and have the same height as that of each outer blade. 
     Preferably but not necessarily, the inner blades are protrudingly formed vertically on inner surfaces of support ribs that partition the air passages. 
     According to another aspect of the present invention, there is provided a double-rotor type motor comprising: a stator; a double-rotor that is positioned at a certain gap on an outer surface and an inner surface of the stator; a rotor support on which the double-rotor is integrally formed and a plurality of air passages are radially penetratively formed; a heat dissipation unit that is integrally formed with the rotor support and that forcibly ventilates outer air into the air passages during rotation of the rotor, to thereby dissipate heat generated from the stator; and a Hall sensor assembly that is mounted on a stator support supporting the stator, wherein the Hall sensor assembly comprises: Hall sensors that are placed facing permanent magnets of the double-rotor; a Hall sensor substrate on which the Hall sensors are surface-mounted; and a Hall sensor holder into which the Hall sensor substrate are inserted and that is mounted on the stator, and wherein an assembly mounting unit on which the Hall sensor assembly is mounted is formed on the stator support so that the Hall sensor substrate is disposed in a vertical direction parallel to an axial direction. 
     Preferably but not necessarily, the Hall sensor assembly comprises pin type terminals for connection to outer terminals. 
     Preferably but not necessarily, the Hall sensor holder comprises: a vertical accommodator for accommodating the Hall sensor assembly; and a horizontal coupler that is coupled to the stator support, and wherein the coupler is bent a number of times and formed on and coupled to the assembly mounting unit to increase surface contact. 
     Preferably but not necessarily, the accommodator of the Hall sensor holder is formed to a contact point in place of a core of the stator. 
     Preferably but not necessarily, the Hall sensors are surface-mount device (SMD) components that are surface-mounted on the Hall sensor substrate, together with other components provided on the Hall sensor substrate. 
     Preferably but not necessarily, the Hall sensor assembly is disposed separately from a power supply that applies power to coils of the stator. 
     Preferably but not necessarily, an assembly frame is mounted on the stator support, the Hall sensor assembly is mounted on an upper surface of the assembly frame, and the power supply is mounted on a lower surface of the assembly frame. 
     Preferably but not necessarily, the Hall sensor assembly is mounted at the same point in place as that of the power supply on the circumference of the stator support, and is separately dismantled from the power supply. 
     Preferably but not necessarily, the Hall sensor holder is formed in a structure of being inserted in correspondence to a groove formed on an inner circumferential surface of the stator support. 
     As described above, a double-rotor type motor according to the present invention can improve a heat dissipation performance of a stator, in which inner and outer blades are radially formed on a rotor support, to thus forcibly ventilate outer air to the stator. 
     In addition, in a double-rotor type motor according to the present invention, a heat dissipation unit is integrally formed on a rotor support, with no need to have a separate heat dissipation unit for dissipating heat generated from a stator, to thereby reduce a manufacturing cost. 
     In addition, in a double-rotor type motor according to the present invention, inner blades, outer blades and guide protrusions are formed on a rotor support, to thus support a frame structure and to thereby improve overall strength. 
     Also, in a double-rotor type motor according to the present invention, Hall sensors are surface-mounted on a Hall sensor substrate together with other parts to be mounted on the Hall sensor substrate, and a Hall sensor assembly is used in which the Hall sensor substrate is coupled in a vertical direction parallel to an axial direction so that the Hall sensor substrate faces an inner or outer rotor, to thus make it unnecessary to perform a separate assembly process for the Hall sensors, and to thereby improve productivity, and achieve mass production. 
     In addition, according to the present invention, a Hall sensor assembly is separately mounted from a power supply, to thus prevent unnecessary costs from occurring, by replacing the Hall sensor assembly or the power supply that is out of order, without replacing both of the Hall sensor assembly and the power supply. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a cross-sectional view of a motor according to the prior art. 
         FIG. 2  is a cross-sectional view of a motor in accordance with an embodiment of the present invention. 
         FIG. 3  is a top view of a rotor according to an embodiment of the present invention. 
         FIG. 4  is a bottom view of a rotor according to an embodiment of the present invention. 
         FIG. 5  is a cross-sectional view of a rotor according to an embodiment of the present invention. 
         FIG. 6  is a perspective view of a stator having a Hall sensor assembly mounting structure in accordance with another embodiment of the present invention. 
         FIG. 7  is a bottom view of a stator having a Hall sensor assembly mounting structure in accordance with another embodiment of the present invention. 
         FIG. 8  is a top view of a Hall sensor assembly in accordance with another embodiment of the present invention. 
         FIG. 9  is a cross-sectional view of a stator having a Hall sensor assembly mounting structure in accordance with another embodiment of the present invention. 
         FIG. 10  is a top view of a stator having a Hall sensor assembly mounting structure in accordance with another embodiment of the present invention. 
         FIG. 11  is a side view of a stator having a Hall sensor assembly mounting structure in accordance with another embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Aforementioned objects, features and advantages will become clearer through a detailed description which is described below in detail with reference to the accompanying drawings. Accordingly, one of ordinary skill in the art can easily carry out technical spirit of the present invention. In the description of the present invention, if it is determined that a detailed description of commonly-used technologies or structures related to the invention may unnecessarily or unintentionally obscure the subject matter of the invention, the detailed description will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying  FIGS. 2 to 11 . 
       FIG. 2  is a cross-sectional view of a motor in accordance with an embodiment of the present invention. 
     As shown in  FIG. 2 , a motor according to an embodiment of the present invention includes a stator  110  having a large number of cores  111  and coils  112  wound on outer circumferential surfaces of the cores  112 , a double-rotor  120  that is positioned at a certain gap on an outer surface and an inner surface of the stator  110 ; a rotor support  130  on which the double-rotor  120  is integrally formed and to which a rotating axis is fixed. 
     The double-rotor  120  includes an outer rotor  120   a  that is positioned at a certain gap on an outer surface of the stator  110 , and an inner rotor  120   b  that is positioned at a certain gap on an inner surface of the stator  110 . 
     The outer rotor  120   a  includes an outer back yoke  121   a  mounted at the outside of the rotor support  130  and an outer permanent magnet  122   a  mounted on the inner surface of the outer back yoke  121   a.    
     The inner rotor  120   b  includes an inner back yoke  121   b  mounted on the inside of the rotor support  130  and an inner permanent magnet  122   b  mounted on the outer surface of the inner back yoke  121   b.    
     A support frame  300  is fixed at the center of the rotor support  130 , and a rotating axis is fixed to the support frame  300 . 
       FIG. 3  is a top view of a rotor according to an embodiment of the present invention.  FIG. 4  is a bottom view of a rotor according to an embodiment of the present invention.  FIG. 5  is a cross-sectional view of a rotor according to an embodiment of the present invention. 
     The rotor support  130  is formed to have a donut-shaped stator accommodating groove  134  for accommodating the stator  110 , in which a plurality of air passages  128  are radially formed so that outer air is introduced into the inside of the rotor support  130  through the top of a stator accommodation groove  134  on the drawings. 
     Here, the air passages  128  that are formed on the rotor support  130  play a role of air paths through which outer air are introduced into the stator as well as reducing weight of the rotors, to thereby enable a lightweight design. 
     A heat dissipation unit is formed in the rotor support  130  and forcibly inhales air via the air passages  128  during rotation of the double-rotor  120 , to thereby dissipate heat generated from the stator  110 . 
     The heat dissipation unit includes: outer blades  132  that are formed on an outer surface of the rotor support  130  and that forcibly ventilate air into the air passages  128  during rotation of the rotor; and inner blades  131  that are formed on an inner surface of the rotor support  130  and that forcibly ventilate air introduced via the air passages  128  to the stator  110 . 
     The outer blades  132  are protruded vertically at a predetermined height from support ribs  126  that are respectively formed between the air passages  128 , and are radially arranged in a circumferential direction of the rotor support  130 . 
     Guide protrusions  133  are respectively formed at one side of each outer blade  132  in order to guide the air ventilated by the outer blades  132  to the air passages  128 . 
     The guide protrusions  133  are respectively formed with a predetermined length in the circumferential direction from both sides of each outer blade  132  and have the same height as that of each outer blade  132 . 
     The guide protrusions  133  are respectively formed at both corner portions of each air passage  128  and guide the air ventilated by the outer blades  132  to the air passages  128 . 
     The inner blades  131  are protruded vertically at a predetermined height from the inner surfaces of the support ribs  126  that are respectively formed between the air passages  128 , and are radially arranged in a circumferential direction of the rotor support  130 . 
     The guide protrusions  133  are formed relatively adjacent to the outer rotor  120   a  in comparison with the inner rotor  120   b , to thereby induce a large centripetal force and to thus increase an effect of making a wind caused by the inner blades  131  and the outer blades  132  blow to the stator  110 . In addition, these inner blades  131 , outer blades  132 , and the guide protrusions  133  are formed on the rotor support  130  support a frame structure, to thereby increase the overall intensity. 
     The rotor support  130  opens the bottom of the stator accommodating groove  134  on the drawings and accommodates the stator  110 . In this case, the rotor support  130  is formed to have the inner rotor  120   b  and the outer rotor  120   a  on the inner and outer side surfaces of the stator accommodating groove  134 . Here, the stator  110  is combined with the upper end of the stator accommodating groove  134  while keeping a space to a degree. 
     Accordingly, the guide protrusions  133  are provided to enlarge a contact area the wind generated by the inner blades  131  and the outer blades  132  with respect to the stator  110  during rotation, to thereby maximize a heat dissipation structure. 
     The stator  110  is supported by a stator support  114  so as to face the outer and inner rotors  120   a  and  120   b  while maintaining a predetermined interval. In this case, the outer rotor  120   a  and the inner rotor  120   b  is formed to have a double-rotor structure in which the outer and inner rotors  120   a  and  120   b  are positioned at the inner and outer portions with respect to one stator  110 . 
     A Hall sensor assembly  140  for sensing position of the outer rotor  120   a  is coupled at the outside of the stator support  114 . In this case, when the stator support  114  is integrally molded with the stator  110  consisting of a number of split-cores by using an injection molding resin, an assembly mounting portion  132   a  is provided at the outside of the stator support  114 , as a structure of mounting a Hall sensor assembly  140  for arranging a Hall sensor substrate  142 , in a vertical direction, that is, in the direction of the rotating axis. 
     Specifically, the Hall sensor assembly  140  includes a Hall sensor  141 , a Hall sensor substrate  142 , a terminal block  143 , a Hall sensor holder  144 , and a screw or a bolt  145 . 
     In the case of a three-phase driving system, at least two Hall sensors  141 , or typically three Hall sensors are surface-mounted on the Hall sensor substrate  142 , together with other components. In other words, the Hall sensors  141  are manufactured as surface mount device (SMD) components. In this case, the Hall sensor substrate  142  is inserted into and fixed to the Hall sensor holder  144 , and the Hall sensor holder  144  is coupled on the stator support  114  in the vertical direction. As a result, the Hall sensor  141  is placed opposite to the outer rotor  120   a . This means that there is no need to separately adjust orientation of the Hall sensors  141  to detect a magnetic force of the outer rotor  120   a.    
     In addition, this means that SMD components may be used as the Hall sensors  141  together with other parts (for example, resistors, capacitors, etc.) mounted on the Hall sensor substrate  142  and surface-mounted by a surface mount work, simultaneously with other parts, to thereby reduce a manufacturing cost and remove a separate manual insertion and assembly process, and to thus improve reliability and mass-production. Here, the Hall sensors  141  interact with the stator  110  and thus detects a magnetic flux of the rotating the outer rotor  120   a.    
     In addition, a terminal block  143  is inserted into and coupled on the Hall sensor substrate  142 . In this case, the terminal block  143  is soldered on the back of the Hall sensor substrate  142  and is electrically and physically combined with the Hall sensor substrate  142 . Here, the terminal block  143  is formed of pin type terminals, and may be easily connected with and disconnected from a driver by using cables between the driver and the terminal block  143 . In this case, the terminal block  143  may be formed of female connectors for connection with a control device such as the driver. 
     The Hall sensor holder  144  has a shape of achieving a surface contact along the surface of the assembly mounting portion  132   a , and is formed into a frame having a vertical accommodator  144   a  that is formed in a vertical direction in order to fix the Hall sensor substrate  142  to avoid the Hall sensor substrate  142  from moving laterally at a state where the Hall sensor substrate  142  is inserted and housed in the Hall sensor assembly  140 , and a horizontal coupler  144   b  that is formed in a horizontal direction in order to be connected with the assembly mounting portion  132   a  by a screw or bolt  145 . 
     Specifically, when the accommodator  144   a  of the Hall sensor holder  144  is combined with the assembly mounting portion  132   a , the surface of the accommodator  144   a  opposite to the outer rotor  120   a  is placed in a straight line on the stacked surface of the cores  111 , without protruding to the outside. Next, the coupler  144   b  of the Hall sensor holder  144  is formed to have bent portions so as to heighten a surface contact area with respect to the stator support  114  and fixed to the stator support  114  without movement due to vibration of the motor, and to then be surface-mounted on the assembly mounting portion  132   a  and coupled with the assembly mounting portion  132   a  by a screw or bolt  145 . 
     Here, the assembly mounting portion  132   a  is formed to a point in place where the accommodator  144   a  of the Hall sensor holder  144  is made to contact the cores  111  of the stator  110 , in order to dispose the Hall sensors  141  of the Hall sensor assembly  140  closely to the outer rotor  120   a . In other words, width of the winding portion of the coils  112  in the stator  110  is reduced for formation of the assembly mounting portion  132   a . This enables the Hall sensors  141  of the Hall sensor assembly  140  to better detect the magnetic force formed by outer permanent magnet  122   a  of the outer rotor  120   a.    
     In addition, the assembly mounting portion  132   a  has been formed at the outside of the stator support  114  in order to make the Hall sensors  141  of the Hall sensor assembly  140  face the outer rotor  120   a , but in contrast the assembly mounting portion  132   a  may be formed at the inside of the stator support  114 . 
     Meanwhile, the Hall sensor assembly  140  is separately disposed from a power supply  150  for applying power to the coils  112  of the stator  110 . Thus, in the case that any one of the Hall sensor assembly  140  and the power supply  150  is out of order, there is a need to replace only the troubled one since the Hall sensor assembly  140  and the power supply  150  have not been integrated, to accordingly prevent an unnecessary cost from being incurred. 
     As described above, the Hall sensors  141  are surface-mounted on the Hall sensor substrate  142  together with other parts to be mounted on the Hall sensor substrate  142 , and the Hall sensor substrate  142  is vertically combined so as to straightly face the outer rotor  120   a , in the Hall sensor assembly  140 . Accordingly, since there is no need to undergo a separate process of assembling the Hall sensors  141  by considering directions of inserting the Hall sensors  141 , additional costs required in the assembly process of the Hall sensors  141  are prevented from being incurred, and an easy structure for the mass production of the Hall sensor assembly  140  is provided. 
     In addition, the Hall sensor assembly  140  is separately disposed from the power supply  150 , to thus prevent unnecessary costs from occurring, by replacing the Hall sensor assembly or the power supply that is out of order, without replacing both of the Hall sensor assembly and the power supply. 
       FIG. 6  is a perspective view of a stator having a Hall sensor assembly mounting structure in accordance with another embodiment of the present invention.  FIG. 7  is a bottom view of a stator in accordance with another embodiment of the present invention.  FIG. 8  is a top view of a Hall sensor assembly in accordance with another embodiment of the present invention.  FIG. 9  is a cross-sectional view of a stator in accordance with another embodiment of the present invention.  FIG. 10  is a top view of a stator in accordance with another embodiment of the present invention.  FIG. 11  is a side view of a stator in accordance with another embodiment of the present invention. 
     Referring to  FIGS. 6 to 11 , a Hall sensor assembly mounting structure according to another embodiment of the present invention is configured to have a Hall sensor assembly  240  for sensing position of an inner rotor coupled at the inside of a stator support  232 , when a rotor portion is formed of a double-rotor type. 
     The Hall sensor assembly  240  includes Hall sensors  241 , a Hall sensor substrate  242 , a terminal block  243 , a Hall sensor holder  244 , and a screw or bolt  245 . Since the structure of the Hall sensor assembly  240  is the same as that of the Hall sensor assembly  140  described in the above embodiment, the detailed description thereof will be omitted. 
     In addition, when the stator support  232  is integrally molded with a stator  210  by using an injection molding resin, an assembly mounting portion  232   a  is provided on the inner circumferential surface of the stator support  232 , as a structure of mounting the Hall sensor assembly  240  for arranging the Hall sensor substrate  242 , in a vertical direction, that is, in a lengthy direction of the rotating axis. Here, a first assembly opening A through which the Hall sensor assembly  240  may be inserted into the assembly mounting portion  232   a  is formed in the stator support  232 , and a second assembly opening B through which a clutch for clutching and releasing a rotating axis may be inserted is formed on the opposite side of the first assembly opening A. 
     Meanwhile, the Hall sensor assembly  240  is installed at the same point in place as that of the power supply  250  on the circumference of the stator support  232 , but is implemented to have a dual structure that the Hall sensor assembly  240  may be separated from the power supply  250  through an assembly frame  260 . In other words, the assembly frame  260  functions as a protective cover of the power supply  250  when the power supply  250  is placed at the bottom of the assembly frame  260 , and covers power supply  250 . A frame for connection of the Hall sensor assembly  240  by screws or bolts is provided on the upper surface of the assembly frame  260 . 
     In addition, a groove for coupling the Hall sensor assembly  240  is formed on the inner circumferential surface of the stator support  232 , and thus the Hall sensor holder  244  of the Hall sensor assembly  240  is formed to have a structure of being inserted in correspondence to the recessed groove formed on the inner circumferential surface of the stator support  232 . As an example, a convex structure groove is molded on the inner circumferential surface of the stator support  232 , and thus the Hall sensor holder  244  of the Hall sensor assembly  240  is formed into a concave structure groove. 
     As described above, the Hall sensors  241  are surface-mounted on the Hall sensor substrate  242  together with other parts to be mounted on the Hall sensor substrate  242 , and the Hall sensor substrate  242  is vertically combined so as to straightly face the inner rotor, in the Hall sensor assembly  240  according to another embodiment of the present invention. Accordingly, since there is no need to undergo a separate manual insertion and assembly process of assembling the Hall sensors  241  by considering directions of inserting the Hall sensors  241 , additional costs required in the manual insertion and assembly process of the Hall sensors  141  are prevented from being incurred, and an easy structure for the mass production of the Hall sensor assembly  240  is provided. 
     In addition, the Hall sensor assembly  120  is separately disposed from the power supply  250 , to thus prevent unnecessary costs from occurring, by repairing or replacing the Hall sensor assembly or the power supply that is out of order, without replacing both of the Hall sensor assembly and the power supply. 
     As described above, the present invention has been described with respect to particularly preferred embodiments. However, the present invention is not limited to the above embodiments, and it is possible for one who has an ordinary skill in the art to make various modifications and variations, without departing off the spirit of the present invention. Thus, the protective scope of the present invention is not defined within the detailed description thereof but is defined by the claims to be described later and the technical spirit of the present invention. 
     The motor configured as described above according to the present invention can be used in a variety of fields that require rotating power such as washing machines, water pumps for vehicles, and drive apparatuses. In addition, because the motor of the present invention is a double-rotor type motor, the rotational torque of the motor can be increased even if an identical power is applied to the motor, to thus improve efficiency of the motor.