Abstract:
An object of the present invention is to provide a rotary electric machine for vehicle which can improve workability and efficiently secure an attachment space at low cost. In a rotary electric machine according to the present invention, a terminal  34  is attached on the outside of a rear bracket  21  so as to be overlapped and fitted to a voltage adjustment device  22  in an axial direction. Fitting portions  22   j  and  22   k  made of conductors are provided on the voltage adjustment device  22 . Portions  34   m  and  34   p  to be fitted, which are made of conductors, are provided on the terminal  34 . The voltage adjustment device  22  and the terminal  34  are integrally fixed to the rear bracket  21 , with the fitting portions being fitted into the portions to be fitted.

Description:
TECHNICAL FIELD 
       [0001]    The present invention relates to a rotary electric machine for vehicle such as an AC electric generator for vehicle provided in an automobile, a bus, a truck, or the like. 
       BACKGROUND ART 
       [0002]    In a conventional AC electric generator for vehicle, a control circuit portion such as a voltage adjustment device or a rectification device, and a terminal block are each fixed individually so as to be radially adjacent to each other on the outside of a side surface of a rear bracket. The control circuit portion such as a voltage adjustment device, and the terminal block are electrically connected to each other by a connection terminal (for example, Patent Document 1). 
         [0003]    As another conventional example, a terminal block is shown which accommodates a voltage adjustment device and in which the voltage adjustment device, a connection terminal for an external apparatus, and a terminal connecting the voltage adjustment device and an electric generator component are insert-molded (for example, Patent Document 2). 
       CITATION LIST 
     Patent Document 
       [0004]    Patent Document 1: Japanese Laid-Open Patent Publication No. 63-107443 
         [0005]    Patent Document 2: Japanese Laid-Open Patent Publication No. 6-178518 
       SUMMARY OF THE INVENTION 
     Problems to be Solved by the Invention 
       [0006]    The conventional AC electric generator for vehicle according to Patent Document 1 has the following problems. That is, since the voltage adjustment device and the terminal block are located so as to radially oppose to each other on the outside of the side surface of the rear bracket, the attachment area increases, and also, since each is fixed individually to the rear bracket, workability is poor. In addition, since electric connection between the voltage adjustment device and the terminal block is made via each terminal, the number of components increases and assembly work is troublesome. 
         [0007]    The conventional AC electric generator for vehicle according to Patent Document 2 has the following problems. That is, since the voltage adjustment device and the connection terminal for the external apparatus are integrally formed by a resin, when the shape, the attachment direction, or the like of the connection terminal for the external apparatus is to be changed, it is necessary to manufacture again the whole unit including the voltage adjustment device, and also, in the case of exchange due to failure of the voltage adjustment device, components including the connection terminal for the external apparatus are to be exchanged, resulting in cost increase. 
         [0008]    The present invention has been made to solve the above problems, and an object of the present invention is to obtain a rotary electric machine for vehicle having excellent workability and high versatility with low cost. 
       Solution to the Problems 
       [0009]    A rotary electric machine for vehicle according to the present invention includes: a rotary shaft; a magnetic pole iron core fixed to the rotary shaft and having a magnetic pole; a field coil attached at an inner circumferential portion of the magnetic pole iron core; a bowl-like front bracket supported via a front bearing on the rotary shaft; a stator iron core provided so as to oppose to the magnetic pole iron core via a minute clearance; a stator coil wound on the stator iron core; a bowl-like rear bracket supported via a rear bearing on the rotary shaft, and fixing the stator iron core, together with the front bracket; a voltage adjustment device attached on the outside of the rear bracket, for controlling applied current in the field coil; and a terminal attached on the outside of the rear bracket so as to be overlapped and fitted to the voltage adjustment device in an axial direction. A fitting portion made of a conductor is provided on a surface of the voltage adjustment device, that opposes to the terminal. A portion to be fitted, which is made of a conductor, is provided on a surface of the terminal, that opposes to the voltage adjustment device. The voltage adjustment device and the terminal are integrally fixed on the outside of the rear bracket, with the fitting portion being fitted into the portion to be fitted. 
       Effect of the Invention 
       [0010]    According to the present invention, since the voltage adjustment device and the terminal can be attached to the rear bracket so as to be overlapped and fitted in the axial direction, the attachment area for these in the radial direction can be decreased, and therefore the attachment area for other components such as the rectification device can be increased. 
         [0011]    In addition, since each of the voltage adjustment device and the terminal can be independently detached from the rear bracket, each of the voltage adjustment device and the terminal can be exchanged as a single component, and therefore the cost decreases. 
         [0012]    Further, since the shape and the attachment direction of the connection terminal of the terminal or the like can be adjusted in accordance with the specifications relevant to the vehicle, the versatility increases and this contributes to further decrease in the cost. 
         [0013]    Still further, since the fitting portion made of a conductor, of the voltage adjustment device is fitted into the portion to be fitted of the terminal, which is made of a conductor, so that the voltage adjustment device and the terminal can be integrally attached, positioning for both components is facilitated and assembly work is improved. 
         [0014]    In addition, since the voltage adjustment device and the terminal are attached on the outside of the rear bracket so as to be overlapped and fitted in the axial direction, it becomes possible to integrally fix them to the rear bracket from the axial direction by the same fastening screw, and therefore assembly work is not troublesome at all. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0015]      FIG. 1  is a vertical sectional view showing a brushless AC electric generator for vehicle according to embodiment 1 of the present invention. 
           [0016]      FIG. 2  is an enlarged sectional view showing a major part in  FIG. 1 . 
           [0017]      FIG. 3  is a front view of a front bracket of the brushless AC electric generator for vehicle shown in  FIG. 1  as seen from inside. 
           [0018]      FIG. 4  is a front view of a rear bracket of the brushless AC electric generator for vehicle shown in  FIG. 1  as seen from outside. 
           [0019]      FIG. 5  is a front view of the rear bracket of the brushless AC electric generator for vehicle shown in  FIG. 1  as seen from inside. 
           [0020]      FIG. 6  is a sectional view along G-G line in  FIG. 5 . 
           [0021]      FIG. 7  is a front view showing a voltage adjustment device of the brushless AC electric generator for vehicle shown in  FIG. 1 . 
           [0022]      FIG. 8  is a right side view of the voltage adjustment device shown in  FIG. 7 . 
           [0023]      FIG. 9  is a left side view of the voltage adjustment device shown in  FIG. 7 . 
           [0024]      FIG. 10  is a back view of the voltage adjustment device shown in  FIG. 7 . 
           [0025]      FIG. 11  is a sectional view along A-A line in  FIG. 8 . 
           [0026]      FIG. 12  is a front view showing a terminal of the brushless AC electric generator for vehicle shown in  FIG. 1 . 
           [0027]      FIG. 13  is a right side view of the terminal shown in  FIG. 12 . 
           [0028]      FIG. 14  is a left side view of the terminal shown in  FIG. 12 . 
           [0029]      FIG. 15  is a back view of the terminal shown in  FIG. 12 . 
           [0030]      FIG. 16  is a sectional view along E-E line in  FIG. 15 . 
           [0031]      FIG. 17  is a transparent front view of a conductor terminal of the terminal shown in  FIG. 12 . 
           [0032]      FIG. 18  is a front view of the voltage adjustment device and the terminal that are overlapped and fitted, of the brushless AC electric generator for vehicle shown in  FIG. 1 . 
           [0033]      FIG. 19  is a right side view partially including a sectional view, of the voltage adjustment device and the terminal that are overlapped and fitted, shown in  FIG. 18 . 
           [0034]      FIG. 20  is a left side view of the voltage adjustment device and the terminal that are overlapped and fitted, shown in  FIG. 18 . 
           [0035]      FIG. 21  is a back view of the voltage adjustment device and the terminal that are overlapped and fitted, shown in  FIG. 18 . 
           [0036]      FIG. 22  is a sectional view along A-A line shown in  FIG. 18 . 
           [0037]      FIG. 23  is a front view of the brushless AC electric generator for vehicle shown in  FIG. 1  in the state where a cover is detached, as seen from a rear side. 
           [0038]      FIG. 24  is a front view of the brushless AC electric generator for vehicle shown in  FIG. 1  in the state where the cover is attached, as seen from the rear side. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
     Embodiment 1 
       [0039]      FIG. 1  is a vertical sectional view showing a brushless AC electric generator for vehicle according to embodiment 1 of the present invention;  FIG. 2  is an enlarged sectional view showing a major part in  FIG. 1 ;  FIG. 3  is a plan view of a front bracket in  FIG. 1 ;  FIGS. 4 and 5  are front views of a rear bracket;  FIG. 6  is a sectional view along G-G line in  FIG. 5 ;  FIGS. 7 to 11  are views showing a voltage adjustment device;  FIGS. 12 to 17  are views showing a terminal;  FIGS. 18 to 22  are views showing a structure in which the voltage adjustment device and the terminal are overlapped and fitted;  FIG. 23  is a front view in the state where a cover is detached, as seen from a rear side; and  FIG. 24  is a front view in the state where the cover is attached, as seen from the rear side. 
         [0040]    In  FIGS. 1 to 6 , a rotor  2  is provided around a rotary shaft  17 , and further, the rotor  2  has a magnetic pole iron core  3  which transmits a magnetic flux. The magnetic pole iron core  3  is composed of a first magnetic pole iron core  4  and a second magnetic pole iron core  8 . A first boss portion  5  of a rotary body, which composes the first magnetic pole iron core  4 , has a through hole for inserting the rotary shaft  17 , at a central axis position. In addition, a fixed yoke portion  6  which is fixed to a bowl-like front bracket  20  and has a ring shape is provided being spaced radially outward from the first boss portion  5  by a minute clearance. A field coil  13  is fixed to an axial end of the yoke portion  6  via a plate  31  and a bobbin  32 . Further, a first nail-like magnetic pole portion  7  is provided being spaced radially outward from the yoke portion  6  by a minute clearance. The first nail-like magnetic pole portion  7  is fixed to a second nail-like magnetic pole  11  via a ring  12  made of a non-magnetic material, and is provided so as to be engaged with the second nail-like magnetic pole  11 . It is noted that the rotary shaft  17  is pressed into the through hole provided at the central axis of the first magnetic pole iron core  4 , and thus attached so as not be relatively rotatable. On the other hand, a second boss portion  9  composing a second magnetic pole iron core  8  has a through hole for inserting the rotary shaft  17 , at the central axis position, as in the first magnetic pole iron core  4 . A ring-shaped yoke portion  10  of a rotary body extends radially outward from one end of the second boss portion  9 , and further, the second nail-like magnetic pole portion  11  extends toward the other axial end from the outer circumference of the yoke portion  10 . 
         [0041]    It is noted that the rotary shaft  17  is pressed into the through hole provided at the central axis of the second magnetic pole iron core  8 , and thus attached so as not to be relatively rotatable, and in the state where an axial-end surface of the second boss portion  9  abuts the other axial-end surface of the first boss portion  5 , they are attached so as not to be relatively rotatable. 
         [0042]    Further, a stator  14  has a stator iron core  15  wound with a stator coil  16 , and is provided so as to surround the outer circumference of the rotor  2 . The front bracket  20 , together with a rear bracket  21 , holds the stator iron core  15  so as to sandwich shoulder portions at both axial ends of the stator iron core  15  by using a through bolt  23 . The front bracket  20  rotatably supports one end side of the rotary shaft  17  via a front bearing  18 , and the rear bracket  21  rotatably supports the other end side of the rotary shaft  17  via a rear bearing  19 . Thus, the rotor  2  is rotatably provided within the front bracket  20  and the rear bracket  21 . On the rotary shaft  17 , a cooling fan  33  is fixed outside the front bracket  20 . Further, a pulley  24  is fixed to one end of the rotary shaft  17  extending outward from the front bracket  20 , and is driven by an engine (not shown). 
         [0043]    On the outside of the rear bracket  21 , a voltage adjustment device  22  is attached for controlling applied current of the field coil  13 . A terminal  34  is attached integrally with the voltage adjustment device  22  so as to be overlapped and fitted in the axial direction. In addition, as shown in  FIG. 23 , on the outside of the rear bracket  21 , a rectification device  30  is attached so as to surround the voltage adjustment device  22  and the terminal  34 . Further, as shown in  FIG. 24 , a resin cover  29  is fixed to the rear bracket  21  so as to surround the voltage adjustment device  22 , the terminal  34 , and the rectification device  30 . A plurality of intake holes  29   a  for introducing cooling air are provided in the resin cover  29 . A lead-out lead wire  25  for connecting the voltage adjustment device  22  and the field coil  13  is provided at inner circumferential portions of both brackets  20  and  21 . One end of the lead-out lead wire  25  is connected to the field coil  13 , and the other end is connected to the voltage adjustment device  22  via the terminal  34 . The lead-out lead wire  25  has a first insulation tube  28  formed by an impregnation resin, on the outer circumference thereof across almost the whole length. An accommodation groove  20   a  which is a tetragonal depressed portion is provided on a side-surface inner wall of the front bracket  20 . In addition, an accommodation groove  20   b  which is a depressed portion having an ark-like sectional shape is formed on an inner wall on the stator iron core  15  attachment side of the front bracket  20 . Further, a mold body  26  for protecting the lead-out lead wire  25  in an insulating manner is provided so as to be fitted into each of the accommodation grooves  20   a  and  20   b . A portion of the mold body  26 , that is fitted into the accommodation groove  20   a , is formed in a tetragonal shape, and a portion fitted into the accommodation groove  20   b  is formed in a cylindrical shape. Each portion is accommodated to be positioned within the grooves  20   a  and  20   b.    
         [0044]    One end of the mold body  26  is attached to the yoke portion  6 , and the other end is attached by being sandwiched between end surfaces of the front bracket  20  and the rear bracket  21 . 
         [0045]    The cooling fan  33  which is a centrifugal fan of external fan type and is fixed to the rotary shaft  17 , is provided between the outside of the front bracket  20  and the pulley  24 . The front bracket  20  and the rear bracket  21  respectively have a plurality of vent holes  20   c  and a plurality of vent holes  21   c . By rotation of the cooling fan  33 , cooling air enters from the intake hole  29   a  of the cover  29  to pass through the vent hole  21   c  of the rear bracket  21 , pass between the nail-like magnetic pole portions  7  and  11  and on the inner circumferential surface of the stator coil  16 , and then pass through the vent hole  20   c  of the front bracket  20  to flow outward in the radial direction. 
         [0046]    In addition, a through hole  21   a  for inserting and holding the lead-out lead wire  25  is formed at an inner circumferential portion of the rear bracket  21 . The through hole  21   a  has a circular sectional shape and has a greater inner diameter than the lead wire diameter so that the lead-out lead wire  25  can be inserted. In addition, at most part of an attachment portion of the lead-out lead wire  25  on the accommodation grooves  20   a  and  20   b  and the through hole  21   a , a second tube  27  made of a silicon tube is provided on the outer circumference of the first tube  28 . Further, the field coil  13  side of the lead-out lead wire  25  is connected to the field coil  13  through a through hole provided at an inner circumferential portion of the yoke portion  6 . 
         [0047]    Next, the voltage adjustment device  22  will be described in detail. 
         [0048]      FIGS. 7 to 11  are views showing the configuration of the voltage adjustment device  22  of the present embodiment 1. 
         [0049]    In  FIGS. 7 to 11 ,  22   a  is a heat sink made of aluminum or the like, and a plurality of fins  22   b  are formed integrally therewith.  22   c  is a semiconductor chip attached on the heat sink  22   a , and is sealed in by a resin  22   d .  22   e  is a case for accommodating the semiconductor chip  22   c  and the resin  22   d , and is formed integrally with the heat sink  22   a .  22   f  is a B terminal,  22   g  is an earth terminal, and  22   h  is a P terminal, and they are connected to an output for one phase of the stator coil  16 .  22   i  is an F terminal, and is connected to the field coil  13 .  22   j  is an S terminal, and is a voltage detection terminal.  22   k  is an L terminal, and is connected to a display lamp circuit. The connection terminals of the S terminal  22   j  and the L terminal  22   k  protrude in the axial direction so as to form fitting portions. 
         [0050]    Next, the terminal will be described in detail. 
         [0051]      FIGS. 12 to 17  are views showing the configuration of the terminal  34  of the present embodiment 1. 
         [0052]    In  FIGS. 12 to 17 ,  34   a  is a resin molded portion, and is molded by resin integrally with a P terminal portion  34   b , an S terminal portion  34   c , an L terminal portion  34   d , and an F terminal portion  34   e.    
         [0053]      34   f  is a P terminal bolt connected to the P terminal portion  34   b  and protruding in the axial direction.  34   g  is an S terminal bolt connected to the S terminal portion  34   c  and protruding in the axial direction.  34   h  is an L terminal bolt connected to the L terminal portion  34   d  and protruding in the axial direction.  34   i  is a terminal portion that is one end of the F terminal portion  34   e .  34   j  is a ring terminal that is the other end of the P terminal portion  34   b .  34   k  is a terminal that is the other end of the S terminal portion  34   c , and has a through hole  34   m  as a portion to be fitted.  34   n  is a terminal that is the other end of the L terminal portion  34   d , and has a through hole  34   p  as a portion to be fitted.  34   q  is a ring terminal that is the other end of the F terminal portion  34   d .  34   r  is a cylindrical protrusion into which the other end of the lead-out lead wire  25  is inserted, and is fitted into the through hole  21   a  of the rear bracket  21 .  34   s  is an attachment portion.  34   t  is an arm portion for attachment to the rear bracket  21 . 
         [0054]    The voltage adjustment device  22  and the terminal  34  are attached integrally in the axial direction, to the outside of the rear bracket  21  by fastening screws  35 ,  36 ,  37 ,  38 , and  39 . 
         [0055]      FIGS. 18 to 22  are views showing a structure in which the voltage adjustment device  22  and the terminal  34  are integrally overlapped and fitted. 
         [0056]    In  FIGS. 18 to 22 , first, the voltage adjustment device  22  is temporarily fixed at a predetermined attachment seat on the outside of the rear bracket  21 . In this state, the S terminal  22   j  and the L terminal  22   k  protrude in the axial direction. Thereafter, the terminal  34  is placed on the voltage adjustment device  22  from the axial direction. 
         [0057]    At this time, fitting position adjustment is performed so that the S terminal  22   j  and the L terminal  22   k  of the voltage adjustment device  22  will be inserted into the through hole  34   m  and the through hole  34   p  of the terminal, and then the terminal  34  is overlapped and fitted to the voltage adjustment device  22 . Thus, the P terminal  22   h  and the terminal  34   j , the earth terminal  22   g  and the attachment portion  34   s , and the F terminal  22   i  and the terminal  34   q  of both members are fitted to each other. Thereafter, as shown in  FIG. 23 , the P terminal, the F terminal, and the earth terminal are fixed to the rear bracket  21  by the fastening screw  35 , the fastening screw  36 , and the fastening screw  37 , respectively, at the same time. In addition, the voltage adjustment device  22  and the terminal  34  are fixed to the rear bracket  21  by the fastening screw  38  and the fastening screw  39 , respectively. 
         [0058]    Thereafter, the resin cover  29  for surrounding the voltage adjustment device  22 , the terminal  34 , and the rectification device  30  is attached to the rear bracket  21 . The P terminal bolt  34   f , the S terminal bolt  34   g , and the L terminal bolt  34   h  of the terminal  34  protrude outward from the cover  29 . 
         [0059]    These terminal bolts  34   f ,  34   g , and  34   h  are each connected to an external terminal of an external apparatus (not shown) via a lead wire or the like. 
         [0060]    In the brushless AC electric generator for vehicle thus configured, current is supplied from a battery (not shown) to the field coil  13 , whereby a magnetic flux Φ is generated around the field coil  13 . The magnetic flux Φ flows through the following route. That is, the magnetic flux Φ is transmitted from the yoke portion  6  through the minute clearance retained on the radial inside to the first boss portion  5 , and then passes through the second boss portion  9  whose end surface abuts to the first boss portion  5 , the yoke portion  10 , and then the second nail-like magnetic pole portion  11 . Then, the magnetic flux Φ crosses the stator  14  located on the radial outside of the rotor  2 , passes through the first nail-like magnetic pole portion  7  and the minute clearance on the radial inside thereof, and finally returns to the yoke portion  6 . Therefore, the second nail-like magnetic pole portion  11  is magnetized to N pole and the first nail-like magnetic pole portion  7  is magnetized to S pole. 
         [0061]    On the other hand, by the pulley  24  being driven by an engine, the rotary shaft  17  directly connected to the pulley  24  rotates, whereby the rotor  2  rotates. By the rotation, a magnetic field generated by the field coil  13  also rotates, and the magnetic flux Φ forming the rotating magnetic field is provided to the stator iron core  15  through the above-described route, whereby AC electromotive force occurs in the power stator coil  16 . AC current generated in the stator coil  16  by the AC electromotive force is rectified into DC by the rectification device  30 , and the battery (not shown) is charged. At this time, since the field coil  13  is attached to the yoke portion  6  fixed on the front bracket  20 , the field coil  13  does not rotate, but the first boss portion  5  and the first nail-like magnetic pole portion  7  of the first magnetic pole iron core  4 , and the second magnetic pole iron core  8  integrally formed by the second boss portion  9 , the yoke portion  10 , and the second nail-like magnetic pole portion  11 , rotate. 
         [0062]    In the present embodiment 1, the lead-out lead wire  25  is inserted into the mold body  26 , whereby the lead-out lead wire  25  can be fixed and held, and also, is electrically and mechanically protected from the rotor  2 . In addition, by the accommodation grooves  20   a  and  20   b  and the through hole  21   a  provided on the brackets  20  and  21 , the mold body  26  can be attached to the brackets  20  and  21 . Therefore, the mold body  26  does not drop off even when vibration occurs, and can be sufficiently protected from water or dust. Also, since positioning thereof is easy, the lead-out lead wire  25  can be reliably and easily fixed on the brackets  20  and  21 . 
         [0063]    In addition, a flange portion of the mold body  26  is fixed by being sandwiched between both brackets  20  and  21 , whereby the mold body  26  can be further reliably fixed and held. Further, work for fixing the lead-out lead wire  25  by an adhesive agent or the like is removed, whereby workability is improved. 
         [0064]    In a fixing method using an adhesive agent or the like, the adhesion might be released during the work, so that the rotor  2  and the lead wire  25  might contact with each other. However, the fixing method of the present invention can also solve such a problem. 
         [0065]    Further, since the lead-out lead wire  25  is inserted into the mold body  26  and the double layer tubes  27  and  28 , exposure thereof is decreased, so that the influence of water, dust, or the like can be further reduced. 
         [0066]    In addition, in order to connect the lead-out lead wire  25  to the voltage adjustment device  22  attached on the outside of the rear bracket  21 , the lead-out lead wire  25  is inserted into the through hole  21   a  of the rear bracket  21 . Therefore, the connection to the voltage adjustment device  22  can be made using the lead-out lead wire  25  having an extremely short dimension, and also, the lead-out lead wire  25  can be protected and reliably guided. 
         [0067]    Further, the cylindrical protrusion  34   r  into which the lead wire  25  for connecting the field coil  13  and the voltage adjustment device  22  is inserted is provided at an axial end of the terminal  34  opposite to the external connection terminal bolts  34   f ,  34   g , and  34   h , and the protrusion  34   r  is fitted into the through hole  21   a  of the rear bracket  21 . Therefore, positioning of the terminal  34  with respect to the rear bracket  21  can be made, so that assembly is facilitated. In addition, since the lead-out lead wire  25  of the field coil  13  is surrounded and protected by the through hole  21   a  of the rear bracket  21  and the protrusion  34   r  of the terminal  34 , entry of water, dust, and the like can be suppressed. 
         [0068]    In addition, since the voltage adjustment device  22  and the terminal  34  are formed as independent bodies, each can be exchanged individually even in such cases where each has failed or deteriorated. In addition, in the terminal  34 , placement of the external connection terminal bolts differs depending on the specifications of each vehicle, but even such a case can be easily coped with by preparing various kinds of terminals  34 . In addition, when the voltage adjustment device  22  and the terminal  34  are overlapped and fitted, the S terminal  22   j  and the L terminal  22   k  protruding on the voltage adjustment device  22  are inserted into the through holes  34   m  and  34   p  for the terminals of the terminal  34 , thereby enabling fitting and positioning. Therefore, assembly is facilitated. In addition, the P terminal  22   h  and the terminal  34   j , the earth terminal  22   g  and the attachment portion  34   s , and the F terminal  22   i  and the terminal  34   q  of the voltage adjustment device  22  and the terminal  34  are respectively fixed by common fastening screws  35 ,  37 , and  36  from the axial direction. Therefore, the number of components is decreased and assembly workability is facilitated. Further, since the voltage adjustment device  22  and the terminal  34  are placed on the rear bracket  21  so as to be overlapped and fitted in the axial direction, the attachment area in each of the circumferential direction and the radial direction can be decreased. Therefore, the heat sink attachment area on the rectification device  30  which is adjacently placed can be increased, whereby cooling performance can be improved and output can be improved. In addition, since the P terminal bolt  34   f , the S terminal bolt  34   g , the L terminal bolt  34   h , and the fastening screws for fastening the terminals are guided in the axial direction, the attachment area in each of the circumferential direction and the radial direction of the terminal  34  itself can be further reduced. 
         [0069]    Although the above description has shown an application to the brushless AC electric generator for vehicle as an example, application to an AC electric generator for vehicle with brush is also possible. 
         [0070]    In addition, although all of the above examples are application to an AC electric generator, application to an electric motor generator having both functions of electric motor and electric generator is also possible. 
         [0071]    Further, although the above description has shown a nail-like magnetic pole as the rotary magnetic pole as an example, the rotary magnetic pole is not limited thereto.