JP5159658B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine such as a vehicle alternator, and more particularly to a diode support structure in the rectifier.

  In a conventional rectifier in a vehicle alternator, a positive side and a negative side cooling plate having surfaces formed of arc-shaped planes with different inner diameters are positioned on the same plane perpendicular to the rotation axis, The plurality of positive side diodes are soldered to the surface of the positive side cooling plate and arranged circumferentially, and the plurality of negative side diodes are soldered to the surface of the negative side cooling plate. (See, for example, Patent Document 1).

JP-A-8-182279

  In a conventional rectifier in an automotive alternator, positive and negative diodes are attached to the surfaces of the positive and negative cooling plates by solder bonding. Therefore, at the time of soldering, it is necessary to raise both the positive electrode side and negative electrode side diodes and the positive electrode side and negative electrode side cooling plates to a temperature suitable for solder bonding, which increases the work time for mounting the positive electrode side and negative electrode side diodes. There was a problem.

  The present invention has been made in order to solve such problems. A rotating electric machine equipped with a rectifier that can devise a support structure for a diode heat sink and reduce the work time for mounting the diode to the heat sink. The purpose is to obtain.

The rotating electrical machine according to the present invention includes a case, a rotor fixed to the rotating shaft pivotally supported by the case, and a rotor disposed in the case, and supported by the case so as to cover an outer periphery of the rotor. A stator having a stator coil wound around a stator core, and a rectifier electrically connected to the stator coil and rectifying an alternating current generated in the stator coil into a direct current. I have. The rectifier includes a plurality of diodes and a heat sink that supports the plurality of diodes, and each of the plurality of diodes includes a metal base and a rectifying element bonded on the metal base. And an insulating resin portion formed on the metal base so as to embed the rectifying element, and each of the metal bases is disposed between support walls erected so as to face the heat sink, and the support Only both side portions of the metal base sandwiched between the walls are fixed by caulking by plastic deformation of the support wall, and the bottom portion thereof is supported in close contact with the heat sink and the movement is restricted.

  According to the present invention, since the metal base is plastically deformed on the support walls on both sides, the bottom thereof is brought into close contact with the heat sink, and the movement is restricted, it is supported without soldering the metal base to the heat sink. The diode can be supported by the heat sink. Therefore, it is not necessary to raise the metal base and the heat sink to a temperature suitable for solder joining, and the time for mounting the diode can be shortened.

1 is a longitudinal sectional view showing an automotive alternator according to Embodiment 1 of the present invention. It is a perspective view which shows the rectifier mounted in the alternating current generator for vehicles which concerns on Embodiment 1 of this invention. It is sectional drawing explaining the structure of the positive electrode side diode applied to the rectifier mounted in the alternating current generator for vehicles which concerns on Embodiment 1 of this invention. It is sectional drawing explaining the structure of the negative electrode side diode applied to the rectifier mounted in the alternating current generator for vehicles which concerns on Embodiment 1 of this invention. It is a figure explaining the attachment method of the diode in the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 1 of this invention. It is an electric circuit diagram in the vehicle alternator according to Embodiment 1 of the present invention. It is a perspective view which shows the positive electrode side diode applied to the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 2 of this invention. It is a perspective view which shows the attachment state of the positive electrode side diode in the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 2 of this invention. It is a perspective view which shows the positive electrode side diode applied to the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 3 of this invention. It is a perspective view which shows the attachment state of the positive electrode side diode in the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 3 of this invention. It is a perspective view which shows the positive electrode side diode applied to the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 4 of this invention. It is a perspective view which shows the attachment state of the positive electrode side diode in the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 4 of this invention. It is XIII-XIII arrow sectional drawing of FIG. It is a perspective view which shows the positive electrode side diode applied to the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 5 of this invention. It is a perspective view which shows the attachment state of the positive electrode side diode in the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 5 of this invention. It is a longitudinal cross-sectional view which shows the alternating current generator for vehicles which concerns on Embodiment 6 of this invention. It is a perspective view which shows the rectifier mounted in the vehicle alternating current generator which concerns on Embodiment 6 of this invention.

  Hereinafter, preferred embodiments of a rotating electrical machine of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
1 is a longitudinal sectional view showing an automotive alternator according to Embodiment 1 of the present invention, and FIG. 2 is a perspective view showing a rectifier mounted on the automotive alternator according to Embodiment 1 of the present invention. FIG. 3 is a cross-sectional view for explaining the configuration of the positive-side diode applied to the rectifier mounted on the vehicle alternator according to Embodiment 1 of the present invention, and FIG. 4 shows the configuration of Embodiment 1 of the present invention. Sectional drawing explaining the structure of the negative electrode side diode applied to the rectifier mounted in the alternating current generator for vehicles which concerns, FIG. 5 is the rectifier mounted in the alternating current generator for vehicles which concerns on Embodiment 1 of this invention. FIG. 6 is an electric circuit diagram of the automotive alternator according to Embodiment 1 of the present invention. In FIG. 2, the circuit board 35 is omitted.

  1 and 2, an automotive alternator 100 supports a case 1 composed of a substantially bowl-shaped aluminum front bracket 2 and a rear bracket 3 and a rotating shaft 19 supported by the case 1 via a bearing 4. The rotor 16 rotatably disposed in the case 1, the pulley 5 fixed to the end of the rotating shaft 19 extending to the front side of the case 1, and both ends of the rotor 16 in the axial direction A fan 6 fixed to the surface, a fixed air gap 10 with respect to the rotor 16, a stator 13 surrounding the outer periphery of the rotor 16 and fixed to the case 1, and a rear of the rotating shaft 19 A pair of slip rings 7 that are fixed to the side and supply current to the rotor 16, a pair of brushes 8 that slide on the surface of each slip ring 7, a brush holder 9 that houses these brushes 8, and a stator 13 electrically connected A voltage regulator that adjusts the magnitude of the AC voltage generated in the stator 13 by being attached to the rectifier 20 that converts AC generated in the stator 13 into DC and the heat sink 12 fitted to the brush holder 9 11.

  The stator 13 has a cylindrical stator core 14 and a stator coil 15 wound around the stator core 14, and an alternating current is generated by a change in magnetic flux from a field coil 17, which will be described later, as the rotor rotates. It is equipped with.

  The rotor 16 includes a field coil 17 that generates a magnetic flux when an excitation current is passed, a pole core 18 that is provided so as to cover the field coil 17, and a magnetic pole is formed by the magnetic flux, and an axial center position of the pole core 18. And a rotating shaft 19 penetrating the shaft. The fan 6 is fixed to both end surfaces in the axial direction of the pole core 18 by welding or the like.

  The rectifier 20 includes a positive diode 21, a negative diode 22, a first heat sink 23 that supports the positive diode 21, a second heat sink that supports the negative diode 22, a positive and negative diode 21, 22 and a circuit board 35 that electrically connects the stator coil 15 to each other.

  As shown in FIG. 3, the positive-side diode 21 includes a rectifying element 21a configured by pn-junction of an N-type semiconductor and a P-type semiconductor, and a surface of the rectifying element 21a opposite to the P-type semiconductor of the N-type semiconductor. A rectangular flat metal base 21b solder-bonded to an insulating resin portion 21c formed by molding the rectifying element 21a and the metal base 21b into a substantially rectangular parallelepiped, and one end connected to the P-type semiconductor of the rectifying element 21a. And a lead terminal 21 d that extends from the insulating resin portion 21 c and is connected to the circuit board 35 at the other end. Here, as for the metal base 21b, both sides protrude from the insulating resin part 21c, and the bottom face is exposed.

  As shown in FIG. 4, the negative-side diode 22 includes a rectifying element 22 a configured by pn-junction of an N-type semiconductor and a P-type semiconductor, and a surface of the rectifying element 22 a opposite to the N-type semiconductor of the P-type semiconductor. A rectangular flat metal base 22b solder-bonded to an insulating resin portion 22c formed by molding the rectifying element 22a and the metal base 22b into a substantially rectangular parallelepiped, and one end connected to the N-type semiconductor of the rectifying element 22a. And a lead terminal 22 d that extends from the insulating resin portion 22 c and is connected to the circuit board 35 at the other end. Here, as for the metal base 22b, both side parts protrude from the insulating resin part 22c, and the bottom face is exposed. In addition, it is preferable to use copper as a material for the metal bases 21b and 22b from the viewpoint of electrical conduction and heat conduction.

  The first heat sink 23 is radially formed at a predetermined pitch in the circumferential direction from the first heat sink base 24 formed on an arc-shaped belt-shaped flat plate having a predetermined thickness and a predetermined radial width, and the back surface of the first heat sink base 24. And a plurality of radiating fins 25 extending in the axial direction, respectively, and tongue pieces extending radially outward from three circumferential ends and the center of the surface of the first heat sink base 24. 26, for example, by die casting using an aluminum alloy. Each tongue piece 26 is provided with a through hole 27 for attachment. Further, three positive diodes 21 are mounted on the surface between the tongue pieces 26 of the first heat sink base 24 at a predetermined interval in the circumferential direction.

  The second heat sink 29 has a second heat sink base 30 formed in an arc belt-like flat plate having a predetermined thickness and a predetermined radial width, and is manufactured by die casting using an aluminum alloy, for example. Then, through holes 31 for attachment are formed at three locations at both ends and the center in the circumferential direction of the first heat sink base 30. Further, three negative electrode side diodes 22 are mounted on the surface between the through holes 31 of the second heat sink base 30 at a predetermined interval in the circumferential direction.

  The inner diameter of the second heat sink base 30 is made larger than the outer diameter of the first heat sink base 24. The first and second heat sinks 23 and 29 are arranged on the outer diameter side of the first heat sink base 24 so that the surfaces of the first and second heat sink bases 24 and 30 are located on the same plane. Assembled and assembled. At this time, the tongue piece 26 extends on the surface of the second heat sink base 30, and the hole center of the through hole 27 coincides with the hole center of the through hole 31 formed in the second heat sink base 30. Further, the negative-side diodes 22 are respectively positioned outward in the radial direction of the positive-side diode 21. Although not shown, an insulating bush is interposed between the tongue piece portion 26 and the second heat sink base 30 to ensure electrical insulation between the first and second heat sinks 23 and 29. .

  As described above, the first and second heat sinks 23 and 29 on which the positive and negative diodes 21 and 22 are mounted have the brush holders with the surfaces of the first and second heat sink bases 24 and 30 facing the rotor 16. 9 surrounds the slip ring 7 and is disposed in the rear bracket 3 coaxially with the rotary shaft 19. At this time, both surfaces of the first and second heat sink bases 24 and 30 are located on the same plane orthogonal to the axis of the rotation shaft 19. Further, a circuit board 35 is disposed on the rotor 16 side of the first and second heat sinks 23 and 29. Although not shown in the drawing, the mounting bolt includes a through hole formed in the circuit board 35, a through hole 27 formed in the tongue piece portion 26, and a through hole 31 formed in the second heat sink base 30. And is fastened to the rear bracket 3. As a result, the second heat sink base 30 is electrically connected to the rear bracket 3 and is armed. The lead terminals 21 d and 22 d of the positive and negative diodes 21 and 22 that are opposed to each other in the radial direction are connected to the lead wires 36 of the respective phases of the stator coil 15 via the circuit board 35.

  As shown in FIG. 6, the positive side and negative side diodes 21 and 22 include two sets of diodes formed by three diode pairs in which a positive side diode 21 and a negative side diode 22 are connected in series by a circuit board 35. The bridges 20A and 20B are connected to form a bridge. The stator coil 15 has a three-phase AC winding 15A made by Y-connecting three windings 15a, 15b, and 15c, and a three-phase made by Y-connecting three windings 15d, 15e, and 15f. An AC winding 15B is configured, and output ends of the windings 15a, 15b, 15c, 15d, 15e, and 15f are connected to a connection point between the positive diode 21 and the negative diode 22 of each diode pair. The three-phase AC voltage output from each output end of the three-phase AC winding 15A is full-wave rectified and output by the diode bridge 20A, and is output from each output end of the three-phase AC winding 15B. The voltage is full-wave rectified by the diode bridge 20B and output.

Here, the support structure of the positive and negative diodes 21 and 22 will be described with reference to FIG.
First, the pair of support walls 37 are erected in parallel at intervals slightly larger than the width of the metal base 21 b at each mounting position of the positive-side diode 21 on the surface of the first heat sink base 24. Moreover, the standing height of the support wall 37 from the surface of the first heat sink base 24 is higher than the thickness of the metal base 21b. These support walls 37 are simultaneously formed when the first heat sink 23 is manufactured by die casting.

  Then, as shown in FIG. 5A, the positive diode 21 is placed on the surface of the first heat sink base 24 so that the metal base 21 b is positioned between the paired support walls 37. Next, while pressing the metal base 21 b against the surface of the first heat sink base 24, the protruding portion from the metal base 21 b of the pair of support walls 37 is pressed toward the metal base 21 b. Therefore, as shown in FIG. 5B, the paired support walls 37 are plastic so as to fall down to the metal base 21b side and bend at the ridge lines on both sides of the metal base 21b protruding from the insulating resin portion 21c. Deform. In this way, the metal base 21 b is supported by the first heat sink base 24 while being moved against the surface of the first heat sink base 24 by being caulked with the pair of support walls 37. The

Further, a pair of support walls 38 are erected in parallel at intervals slightly larger than the width of the metal base 22 b at each mounting position of the negative electrode 22 on the surface of the second heat sink base 30. Moreover, the standing height of the support wall 38 from the surface of the second heat sink base 30 is higher than the thickness of the metal base 22b. These support walls 38 are simultaneously formed when the second heat sink 29 is manufactured by die casting.
Similarly, the negative-side diode 22 is placed on the surface of the second heat sink base 30 so that the metal base 22b is positioned between the paired support walls 38, and the paired support walls 38 are caulked. As a result, the movement is restricted and supported by the second heat sink base 30 while maintaining the state of being pressed against the surface of the second heat sink base 30.

As described above, according to the first embodiment, the positive-side and negative-side diodes 21 and 22 squeeze the support walls 37 and 38 that are erected on the first and second heat sink bases 24 and 30, respectively. The first and second heat sink bases 24 and 30 are attached. Therefore, it is not necessary to raise the metal bases 21b and 22b and the first and second heat sink bases 24 and 30 to a temperature suitable for solder bonding, and the time for attaching the positive and negative diodes 21 and 22 can be shortened.
Further, since the support walls 37 and 38 are integrally formed with the first and second heat sinks 23 and 29 by die casting, the support walls 37 and 38 can be easily manufactured, and the support walls 37 and 38 are mechanically formed. Strength can be secured.

  The pair of support walls 37 and 38 are plastically deformed so as to be bent from both sides of the metal bases 21b and 22b at the ridge lines on both sides of the metal bases 21b and 22b, thereby fixing the metal bases 21b and 22b. At this time, the force that bends the support walls 37 and 38 along the ridgelines on both sides of the metal bases 21 b and 22 b acts to press the metal bases 21 b and 22 b against the first and second heat sink bases 24 and 30. Therefore, the bottom surfaces of the metal bases 21 b and 22 b are in close contact with the surfaces of the first and second heat sink bases 24 and 30. Further, since the support walls 37 and 38 are plastically deformed and the bent state is maintained, the force for pressing the metal bases 21b and 22b against the first and second heat sink bases 24 and 30 is maintained for a long time. Therefore, the metal bases 21b and 22b are prevented from coming off and moving, and the metal bases 21b and 22b are kept in close contact with the first and second heat sink bases 24 and 30. Therefore, the positive side and negative side diodes 21 and 22 are prevented from falling off for a long time, and good thermal and electrical connection between the metal bases 21b and 22b and the first and second heat sink bases 24 and 30 is achieved. Connection status is ensured in the long term.

Embodiment 2. FIG.
FIG. 7 is a perspective view showing a positive side diode applied to a rectifier mounted on an automotive alternator according to Embodiment 2 of the present invention, and FIG. 8 is an automotive alternating current according to Embodiment 2 of the present invention. It is a perspective view which shows the attachment state of the positive electrode side diode in the rectifier mounted in a generator.

In FIG. 7, the concave groove 39 has a constant groove width and a constant groove depth over the entire region in the thickness direction of the metal base 21b at the center in the longitudinal direction of both side surfaces opposite to the width direction of the metal base 21b. It is recessed.
Other configurations are the same as those in the first embodiment.

  In order to attach the positive-side diode 21A configured as described above to the first heat sink base 24, first, the metal base 21b is placed on the surface of the first heat sink base 24 so as to be positioned between the pair of support walls 37. To do. Next, while pressing the metal base 21 b against the surface of the first heat sink base 24, the protruding portion from the metal base 21 b of the pair of support walls 37 is pressed toward the metal base 21 b. Therefore, as shown in FIG. 8, the pair of support walls 37 falls to the metal base 21 b side, bends at the ridge lines on both sides of the metal base 21 b, and plastically deforms along the groove shape of the concave groove 39. . As a result, the positive-side diode 21A is supported by the first heat sink base 24 in a state where the metal base 21b is pressed against the surface of the first heat sink base 24 and the movement is restricted.

  According to the second embodiment, the pair of support walls 37 are plastically deformed so as to be bent at the ridge lines on both sides of the metal base 21b and along the groove shape of the concave groove 39. This increases the fixing force of the metal base 21b. Thus, the positive side diode 21A is prevented from falling off for a long time, and a good thermal and electrical connection between the metal base 21b and the first heat sink base 24 is ensured for a long time.

Embodiment 3 FIG.
FIG. 9 is a perspective view showing a positive-side diode applied to a rectifier mounted on an automotive alternator according to Embodiment 3 of the present invention, and FIG. 10 shows an automotive AC according to Embodiment 3 of the present invention. It is a perspective view which shows the attachment state of the positive electrode side diode in the rectifier mounted in a generator.

In FIG. 9, the groove 39 has a constant groove width over the entire region in the thickness direction of the metal base 21 b at the three ends of the longitudinal direction on both side surfaces opposite to the width direction of the metal base 21 b and the central portion. It is recessed at a certain groove depth.
Other configurations are the same as those in the second embodiment.

  In order to attach the positive-side diode 21B configured as described above to the first heat sink base 24, first, the metal base 21b is placed on the surface of the first heat sink base 24 so as to be positioned between the pair of support walls 37. To do. Next, while pressing the metal base 21 b against the surface of the first heat sink base 24, the protruding portion from the metal base 21 b of the pair of support walls 37 is pressed toward the metal base 21 b. Therefore, as shown in FIG. 10, the pair of support walls 37 falls to the metal base 21 b side, bends at the ridge lines on both sides of the metal base 21 b, and is plastically deformed so as to follow the groove shape of each concave groove 39. To do. As a result, the positive-side diode 21B is supported by the first heat sink base 24 in a state where the metal base 21b is pressed against the surface of the first heat sink base 24 and the movement is restricted.

  According to the third embodiment, the pair of support walls 37 are plastically deformed so as to be bent at the ridgelines on both sides of the metal base 21b and along the groove shapes of the three concave grooves 39. The fixing force of the metal base 21b by the wall 37 is further increased. Therefore, the positive diode 21B is prevented from falling off for a long time, and a good thermal and electrical connection between the metal base 21b and the first heat sink base 24 is ensured for a long time.

Embodiment 4 FIG.
FIG. 11 is a perspective view showing a positive-side diode applied to a rectifying device mounted on an automotive alternator according to Embodiment 4 of the present invention, and FIG. 12 is an automotive alternating current according to Embodiment 4 of the present invention. FIG. 13 is a cross-sectional view taken along the line XIII-XIII in FIG. 12. FIG.

In FIG. 11, the groove 40 has a constant groove width and a groove depth that is insulative across the entire thickness direction of the metal base 21b at the center in the longitudinal direction of both side surfaces facing the width direction of the metal base 21b. It is recessed so that it may become deep gradually toward the resin part 21c side.
Other configurations are the same as those in the first embodiment.

  In order to attach the positive-side diode 21C thus configured to the first heat sink base 24, first, the metal base 21b is placed on the surface of the first heat sink base 24 so as to be positioned between the pair of support walls 37. To do. Next, while pressing the metal base 21 b against the surface of the first heat sink base 24, the protruding portion from the metal base 21 b of the pair of support walls 37 is pressed toward the metal base 21 b. Therefore, as shown in FIG. 12, the paired support walls 37 fall to the metal base 21b side, bend at the ridge lines on both sides of the metal base 21b, and plastically deform along the groove shape of the concave groove 40. . As a result, the positive-side diode 21 </ b> C is supported by the first heat sink base 24 in a state where the metal base 21 b is pressed against the surface of the first heat sink base 24 and the movement is restricted.

  According to the fourth embodiment, the pair of support walls 37 are plastically deformed so as to be bent at the ridge lines on both sides of the metal base 21b and along the groove shape of the concave groove 40. This increases the fixing force of the metal base 21b. Furthermore, since the groove depth of the concave groove 40 is gradually increased toward the insulating resin portion 21c, the force that plastically deforms the support wall 37 along the groove shape of the concave groove 40 causes the metal base 21b to 1 acts to press against the heat sink base 24. Since the support wall 37 is plastically deformed, the force for pressing the metal base 21b against the first heat sink base 24 is maintained for a long time. Therefore, the positive side diode 21A is reliably prevented from falling off, and a good thermal and electrical connection between the metal base 21b and the first heat sink base 24 is ensured for a long time.

Embodiment 5 FIG.
FIG. 14 is a perspective view showing a positive-side diode applied to a rectifier mounted on an automotive alternator according to Embodiment 5 of the present invention, and FIG. 15 is a vehicle alternating current according to Embodiment 5 of the present invention. It is a perspective view which shows the attachment state of the positive electrode side diode in the rectifier mounted in a generator.

In FIG. 14, the concave groove 40 has a constant groove width over the entire region in the thickness direction of the metal base 21b at the three ends of the longitudinal direction on both side surfaces opposite to the width direction of the metal base 21b and the central portion. The grooves are recessed so that the groove depth gradually becomes deeper toward the insulating resin portion 21c side.
Other configurations are the same as those in the fourth embodiment.

  In order to attach the positive-side diode 21D configured as described above to the first heat sink base 24, first, the metal base 21b is placed on the surface of the first heat sink base 24 so as to be positioned between the pair of support walls 37. To do. Next, while pressing the metal base 21 b against the surface of the first heat sink base 24, the protruding portion from the metal base 21 b of the pair of support walls 37 is pressed toward the metal base 21 b. Therefore, as shown in FIG. 15, the pair of support walls 37 fall to the metal base 21 b side, bend at the ridge lines on both sides of the metal base 21 b, and plastically deform so as to follow the groove shape of the concave groove 40. . As a result, the positive-side diode 21D is supported by the first heat sink base 24 in a state where the metal base 21b is pressed against the surface of the first heat sink base 24 and the movement is restricted.

  According to the fifth embodiment, the pair of support walls 37 are plastically deformed so as to be bent at the ridgelines on both sides of the metal base 21b and along the groove shape of the three concave grooves 40. The fixing force of the metal base 21b by the wall 37 is further increased. Therefore, the positive diode 21B is more reliably prevented from falling off, and a good thermal and electrical connection between the metal base 21b and the first heat sink base 24 is ensured for a long period.

  In the fourth and fifth embodiments, the protruding height of the support wall is higher than the thickness of the metal base. However, since the groove is recessed so that the groove depth gradually becomes deeper toward the insulating resin portion side, the portion of the support wall plastically deformed along the groove shape of the groove has the first metal base. While pressing against the heat sink base, the movement of the metal base is restricted. Therefore, the protruding height of the support wall may be lower than the thickness of the metal base.

In addition, in Embodiments 2 to 5, the negative side diode is not described. Similarly, a concave groove is formed in the metal base of the negative side diode, and the support wall is plastically deformed to form the second heat sink base. It is supported.
Moreover, in the said Embodiments 2-5, although the ditch | groove shall be provided in the both sides | surfaces of a metal base, the ditch | groove should just be provided in the at least one side of a metal base.

Embodiment 6 FIG.
FIG. 16 is a longitudinal sectional view showing a vehicle alternator according to Embodiment 6 of the present invention, and FIG. 17 is a perspective view of a rectifier mounted on the vehicle alternator according to Embodiment 6 of the present invention. It is.

  16 and 17, the rectifier 50 includes a first heat sink 51 on which six positive diodes 21 are mounted, a second heat sink 29 on which six negative diodes 22 are mounted, a circuit board 35, and the like. Is composed of. The vehicle alternator 101 according to the sixth embodiment is the same as the vehicle alternator 100 according to the first embodiment except that the rectifier 50 is mounted instead of the rectifier 20. It is configured.

  The first heat sink 51 includes a first heat sink base 52 having a predetermined axial length and a predetermined thickness, and a cross section perpendicular to the axial direction formed into a circular arc-shaped cylinder. A plurality of radiating fins 53 erected radially from the inner peripheral surface at an equiangular pitch in the circumferential direction and extending in the axial direction, respectively, both ends in the circumferential direction of one axial end portion of the first heat sink base 52, and And a tongue piece portion 54 extending radially outward from each of the three central portions, and is manufactured by die casting using an aluminum alloy, for example.

  The outer diameter of the first heat sink base 52 is smaller than the inner diameter of the second heat sink base 30. In addition, on the outer peripheral surface of the first heat sink base 52, three attachment surfaces 55 made of a plane orthogonal to the radial direction are formed apart from each other in the circumferential direction between the tongue pieces 54. Further, a pair of support walls 56 are erected on each mounting surface 55 in parallel with a distance slightly larger than the width of the metal base 21b. Furthermore, although not shown, each tongue piece 54 is provided with a through-hole for attachment. The positive-side diode 21 is attached to each attachment surface 55 of the first heat sink base 52 by caulking the paired support walls 56.

  Here, in order to attach the positive-side diode 21 to the first heat sink base 52, the metal base 21 b is placed on the attachment surface 55 of the first heat sink base 52 so that the metal base 21 b is positioned between the pair of support walls 56. While pressing the base 21 b against the mounting surface 55, the protruding portion from the metal base 21 b of the pair of support walls 56 is pressed toward the metal base 21 b. Therefore, the paired support walls 56 fall into the metal base 21b side and are plastically deformed so as to be bent at the ridge lines on both sides of the metal base 21b. Accordingly, the positive diode 21 is supported by the first heat sink base 52 while the metal base 21 b is pressed against the mounting surface 55 of the first heat sink base 52 and the movement is restricted.

  Then, the first heat sink 51 faces the one end in the axial direction of the first heat sink base 52 toward the rotor 16, the second heat sink 29 faces the surface of the second heat sink base 30 toward the rotor 16, and the brush holder 9. At the same time, the slip ring 7 is enclosed, and is disposed in the rear bracket 3 coaxially with the rotary shaft 19. Further, a circuit board 35 is disposed on the rotor 16 side of the first and second heat sinks 51 and 29. Although not shown, the mounting bolt is inserted into the circuit board 35, the tongue piece 54, and the through hole formed in the second heat sink base 30 and fastened to the rear bracket 3. As a result, the second heat sink base 30 is electrically connected to the rear bracket 3 and is armed. Then, the lead terminals 21d and 22d of the positive side and negative side diodes 21 and 22 are connected to the lead wires 36 of the respective phases of the stator coil 15 through the circuit board 35, and the circuit shown in FIG. 6 is configured. The

  Also in the sixth embodiment, the positive and negative side diodes 21 and 22 caulk the support walls 56 and 38 provided upright on the first and second heat sink bases 52 and 30, respectively. Since it is attached to the heat sink bases 52 and 30, the same effect as the first embodiment can be obtained.

In each of the above embodiments, the vehicle alternator has been described. However, the present invention is not limited to the vehicle alternator, and is applied to rotating electric machines such as a vehicle motor and a vehicle generator motor. Produces the same effect.
In each of the above embodiments, the rectifying device is disposed in the rear bracket. However, the rectifying device is attached to the outer end surface of the rear bracket and is disposed outside the rear bracket in the axial direction. May be. In this case, it is preferable to attach the rear cover to the rear bracket so as to cover the rectifier.

In each of the above embodiments, the positive diode is mounted on the first heat sink. However, the negative diode may be mounted on the first heat sink. In this case, the second heat sink on which the positive-side diode is mounted is attached in an electrically insulated state while ensuring a thermal contact state with the rear bracket.
In each of the above embodiments, the first and second heat sinks are arranged coaxially with the rotation axis. However, the first and second heat sinks are not necessarily arranged coaxially with the rotation axis. Instead, it only has to be arranged so as to surround the rotating shaft in cooperation with the brush holder.

  In each of the above embodiments, the positive electrode side and the negative electrode side diode are described as being formed in a substantially rectangular parallelepiped, but the shape of the positive electrode side and the negative electrode side diode is not limited to a substantially rectangular parallelepiped, For example, the insulating resin portions of the positive electrode side and the negative electrode side diode may be columnar, and the metal base may be a disk having a larger diameter than the insulating resin portion. In this case, the metal base may be fixed by caulking the support wall from both radial sides of the metal base.

  In each of the above embodiments, the three-phase AC winding is described as being Y-connected. However, even if the three-phase AC winding is Δ-connected, the same effect can be obtained. In each of the above embodiments, six positive side and negative side diodes are mounted on each of the first and second heat sinks. However, the positive electrode mounted on each of the first and second heat sinks. The number of side and negative side diodes is not limited to six. For example, when the stator coil is composed of a set of three-phase AC windings and the output of the three-phase AC windings is full-wave rectified by a diode bridge, the positive electrodes mounted on the first and second heat sinks, respectively. The number of side and negative side diodes is three. Also, when the stator coil is composed of a set of three-phase AC windings, and in addition to the three output terminals of the three-phase AC windings, the output of the neutral point Y-connected is full-wave rectified with a diode bridge. The number of positive side and negative side diodes mounted on each of the first and second heat sinks is four.

  DESCRIPTION OF SYMBOLS 1 Case, 13 Stator, 14 Stator core, 15 Stator coil, 16 Rotor, 19 Rotating shaft, 20 Rectifier, 21, 21A, 21B, 21C, 21D Positive side diode, 21a Rectifier, 21b Metal base, 21c Insulating resin part, 22 Negative side diode, 22a Rectifying element, 22b Metal base, 22c Insulating resin part, 23, 51 First heat sink, 24, 52 First heat sink base, 29 Second heat sink, 30 Second heat sink base 37, 38 Support wall, 39, 40 Concave groove.

Claims (4)

A case, a rotor fixed to a rotation shaft supported by the case and disposed in the case, and a stator coil supported by the case so as to cover the outer periphery of the rotor. A stator wound around a stator core, and a rectifier that is electrically connected to the stator coil and rectifies alternating current generated in the stator coil into direct current,
The rectifier includes a plurality of diodes and a heat sink that supports the plurality of diodes,
Each of the plurality of diodes includes a metal base, a rectifying element bonded on the metal base, and an insulating resin portion formed on the metal base so as to embed the rectifying element. The base is disposed between the support walls standing upright so as to face the heat sink, and only the both sides of the metal base sandwiched between the support walls are caulked and fixed by plastic deformation of the support wall, and the bottom portion is A rotating electrical machine characterized by being supported in close contact with the heat sink and restricted in movement.   2. The rotating electrical machine according to claim 1, wherein the support wall is formed by die casting and integrated with the heat sink.   3. The rotation according to claim 1, wherein a concave groove is provided in a side portion of the metal base, and a part of the support wall is plastically deformed along a groove shape of the concave groove. Electric.   The concave groove is provided in the side portion of the metal base so that the groove depth gradually increases in a direction away from the bottom portion of the metal base over the entire region in the thickness direction. 3. The rotating electrical machine according to 3.

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