JP2010166764A - Dynamo-electric machine - Google Patents

Abstract

An object of the present invention is to attach a rectifying element to a heat radiating plate without using a solder bonding or press-fitting fixing method so that the rectifying element or the rectifying element does not come off due to a temperature rise of the radiating plate. A rotating electrical machine having a rectifying device that does not cause deformation of the rectifying element and the heat radiating plate or internal destruction of the rectifying element is obtained.
A positive-side rectifier 21 is attached to a positive-side heat radiating plate 27 by mounting a positive-side radiating plate 30 so as to close both openings of a positive-side element insertion hole 29 formed in the positive-side radiating plate 27. The positive electrode side lead terminal 25 is extended from the notch 32 in which the positive electrode side holding plate 30 is formed, and the positive electrode side rectifying element 22 is accommodated in the positive electrode side element insertion hole 29 in a loosely fitted state. The base 23 is configured to be adhered and fixed to the positive-side heat radiating plate 27 and the positive-side holding plate 30 with a conductive adhesive 49.
[Selection] Figure 6

Description

  The present invention relates to a rotating electrical machine such as an AC generator for a vehicle, and more particularly to a mounting structure for a rectifying element of the rectifier.

The vehicle alternator is mounted on a vehicle, driven by power from an engine to generate electric power, and the alternating current power is rectified into direct current by a rectifier. The battery is charged by the output of the vehicular AC generator, and various electrical components are driven.
Since the rectifying device is configured by soldering the rectifying element to the heat radiating plate, when the temperature of the rectifying element or the heat radiating plate is equal to or higher than the melting point of the solder, the solder is melted and the rectifying element is detached.

  In view of such a situation, the metal base of the rectifying element is press-fitted into a through hole formed in the heat radiating plate, and mechanical fixing and electrical connection between the rectifying element and the heat radiating plate are performed without using solder. A secured rectifier has been proposed (see, for example, Patent Document 1).

JP-A-10-242671

  In the rectifying device described in Patent Document 1, since solder is not used for connection between the rectifying element and the heat radiating plate, there is no problem that the rectifying element is detached even when the temperature of the rectifying element or the heat radiating plate increases. However, since the metal base of the rectifying element is press-fitted into the through-hole of the heat sink, the stress at the time of press-fitting causes deformation of the rectifier and the heat sink, or internal destruction of the rectifier, thereby reducing the yield of the rectifier. There was a problem that.

  The present invention has been made to solve such a problem, and the temperature of the rectifying element and the heat radiating plate can be adjusted by attaching the rectifying element to the heat radiating plate without using a soldering or press-fitting fixing method. It is an object of the present invention to provide a rotating electrical machine including a rectifying device in which a rectifying element does not come off due to a rise, and there is no deformation of a rectifying element or a heat radiating plate at the time of attachment, or an internal destruction of the rectifying element.

  A rotating electrical machine according to the present invention includes a stator in which a stator coil is mounted on a cylindrical stator core, and is rotatably disposed on the inner peripheral side of the stator core, and a field coil is mounted on a pole core. And a rectifier that rectifies the AC output of the stator coil. The rectifier includes at least a positive electrode side opening portion of the metal plate-shaped positive electrode side heat dissipation plate having a plurality of positive electrode side element insertion holes and a plurality of positive electrode side element insertion holes. A metal positive-side holding plate fixed to the positive-side heat dissipating plate so as to close the positive-side heat-dissipating plate, a positive-side metal base, and an anode electrically connected to the positive-side metal base. A positive-side unidirectional conducting element mounted on one side of the side metal base, a positive-side mold resin portion embedding the positive-side unidirectional conducting element, and a cathode of the positive-side unidirectional conducting element and electrically connected to the cathode A positive-side lead terminal extending from the positive-side mold resin portion, and loosely fitted in each of the plurality of positive-side element insertion holes closed by the positive-side holding plate; and the positive-side lead terminal Pull out from the positive side opening A positive-side rectifier comprising: a positive-side rectifying element housed; a positive-side conductive adhesive that bonds and fixes the positive-side metal base to the positive-side heat dissipation plate and the positive-side holding plate; and a plurality of negative-sides The negative electrode-side heat sink made of metal with the element insertion hole drilled therein and the negative electrode side so as to close both openings of the plurality of negative electrode-side element insertion holes with at least a negative electrode side opening. A metal negative electrode side holding plate fixed to a heat sink, a negative electrode side metal base, and a negative electrode side metal base that is mounted on one surface of the negative electrode side metal base with a cathode electrically connected to the negative electrode side metal base. A directional conducting element, a negative mold resin portion that embeds the negative unidirectional conductive element, and a negative lead that is electrically connected to the anode of the negative unidirectional conductive element and extends from the negative mold resin portion With negative terminal A negative-side rectifying element that is loosely fitted in each of the plurality of negative-side element insertion holes closed by a holding plate and is housed by drawing out the negative-side lead terminal from the negative-side opening; and the negative electrode And a negative electrode side rectifier comprising a negative electrode side conductive adhesive for adhering and fixing the side metal base to the negative electrode side heat radiating plate and the negative electrode side holding plate.

  According to the present invention, the positive-side and negative-side rectifying elements are housed in the positive-side and negative-side element insertion holes closed by the positive-side and negative-side holding plates, and the positive-side and negative-side metal bases are The positive electrode side and the negative electrode side conductive adhesive are bonded and fixed to the positive electrode side, the negative electrode side heat dissipation plate, and the positive electrode side and negative electrode side holding plate. Therefore, when mounting the positive electrode side and negative electrode side rectifying elements on the positive electrode side and negative electrode side heat radiating plates, no stress is applied to the positive electrode side and negative electrode side rectifying elements and the positive electrode side and negative electrode side heat radiating plates. There is no deformation of the element, positive electrode side and negative electrode side heat sink, or internal breakdown of the positive electrode side and negative electrode side rectifying element. Moreover, since the positive electrode side and negative electrode side element insertion holes are closed by the positive electrode side and negative electrode side holding plates, the positive electrode side and negative electrode side rectifying elements are prevented from coming off. Furthermore, since the soldering of the positive electrode side and the negative electrode side rectifying element to the positive electrode side and the negative electrode side heat sink is not required, there is no problem of the positive electrode side and the negative electrode side rectifying element coming off due to melting of the solder.

1 is a cross-sectional view showing an automotive alternator according to Embodiment 1 of the present invention. It is a perspective view which shows the rectifier in the alternating current generator for vehicles which concerns on Embodiment 1 of this invention. It is the perspective view which looked at the positive electrode side rectifier of the rectifier in the alternating current generator for vehicles concerning Embodiment 1 of this invention from the back surface side. It is the perspective view which looked at the positive electrode side rectifier of the rectifier in the alternating current generator for vehicles concerning Embodiment 1 of this invention from the front side. It is a disassembled perspective view which shows the positive electrode side rectifier of the rectifier in the alternating current generator for vehicles which concerns on Embodiment 1 of this invention. It is VI-VI arrow sectional drawing of FIG. It is sectional drawing along the radial direction of the negative electrode side rectifier of the rectifier in the alternating current generator for vehicles concerning Embodiment 1 of this invention. 1 is an electric circuit diagram of an automotive alternator according to Embodiment 1 of the present invention. It is sectional drawing along the circumferential direction of the positive electrode side rectifier of the rectifier in the alternating current generator for vehicles concerning Embodiment 2 of this invention. It is the perspective view which looked at the positive electrode side rectifier of the rectifier in the alternating current generator for vehicles concerning Embodiment 3 of this invention from the back surface side. It is sectional drawing along the radial direction of the positive electrode side rectifier of the rectifier in the alternating current generator for vehicles concerning Embodiment 4 of this invention. It is sectional drawing along the circumferential direction of the positive electrode side rectifier of the rectifier in the alternating current generator for vehicles concerning Embodiment 5 of this invention. It is sectional drawing along the circumferential direction of the positive electrode side rectifier of the rectifier in the alternating current generator for vehicles concerning Embodiment 6 of this invention. It is principal part sectional drawing which shows the vehicle alternator which concerns on Embodiment 7 of this invention.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing an automotive alternator according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing a rectifier in the automotive alternator according to Embodiment 1 of the present invention, and FIG. FIG. 4 is a perspective view of a positive side rectifier of a rectifier in a vehicle alternator according to Embodiment 1 of the present invention as viewed from the back side, and FIG. 4 is a rectifier in the vehicle alternator according to Embodiment 1 of the present invention. FIG. 5 is an exploded perspective view showing the positive rectifier of the rectifier in the automotive alternator according to Embodiment 1 of the present invention, and FIG. -VI sectional view, FIG. 7 is a sectional view along the radial direction of the negative side rectifier of the rectifier in the automotive alternator according to Embodiment 1 of the present invention, and FIG. 8 is Embodiment 1 of the present invention. It is an electric circuit diagram of the AC generator for vehicles concerning.

  In FIG. 1, an AC generator 1 for a vehicle includes a case 4 made of a substantially bowl-shaped aluminum front bracket 2 and a rear bracket 3, and a shaft 7 supported by a case 4 via a bearing 5. 4 is fixed to both end faces in the axial direction of the rotor 6, the rotor 6 disposed rotatably in the rotor 4, the pulley 13 fixed to the end of the shaft 7 extending to the front side of the case 4, and the rotor 6. The fan 14 has a fixed air gap with respect to the rotor 6, surrounds the outer periphery of the rotor 6, is fixed to the case 4, and is fixed to the rear side of the shaft 7. A pair of slip rings 15 for supplying a current to 6, a pair of brushes 16 disposed in the case 4 so as to slide on each slip ring 15, a brush holder 17 for housing the pair of brushes 16, and a brush Remove the holder 17 A voltage regulator 19 that is bonded and fixed to the attached heat sink 18 and adjusts the magnitude of the AC voltage generated in the stator 10, and is electrically connected to the stator 10, and the AC generated in the stator 10 is converted to DC. And a rectifier 20 for rectifying.

The rotor 6 includes a field coil 8 that generates a magnetic flux when an excitation current is passed, a pole core 9 that is provided so as to cover the field coil 8, and a magnetic pole is formed by the magnetic flux, and an axial center position of the pole core 9. And a shaft 7 penetrating therethrough.
The stator 10 is a cylindrical stator core 11, a stator coil 12 wound around the stator core 11, and alternating current is generated by a change in magnetic flux from the field coil 8 as the rotor 6 rotates. It has.

Next, the configuration of the rectifier 20 will be described with reference to FIGS.
As shown in FIG. 2, the rectifier 20 includes a positive rectifier 21 and a negative rectifier 35.

  As shown in FIGS. 2 to 6, the positive rectifier 21 includes a positive rectifier 22, a positive radiating plate 27 that supports the positive rectifier 22 in an electrically and thermally connected state, The positive-side holding plate 30 is configured to prevent the positive-side rectifying element 22 supported by the side radiator plate 27 from coming off.

  The positive electrode side rectifying element 22 includes a copper positive electrode side metal base 23 made in a disk shape, and a semiconductor pellet 24 as a positive electrode side one-way conducting element disposed with the cathode side bonded to the surface of the positive electrode side metal base 23. And a positive lead terminal 25 connected to the anode side of the semiconductor pellet 24. The positive-side rectifying element 22 is formed into a cylindrical body by embedding a semiconductor pellet 24 disposed on the surface of the positive-side metal base 23 by the positive-side resin mold portion 26, and the positive-side lead terminal 25 is a positive-side metal. It extends from the end surface opposite to the base 23.

  The positive-side heat radiating plate 27 is formed by molding an aluminum material into an arc-shaped flat plate. And the attachment hole 28 is pierced in each of the circumferential direction both ends and center of the positive electrode side heat sink 27. As shown in FIG. Further, three positive electrode side element insertion holes 29 each having a circular hole shape are provided in the circumferential direction between the mounting holes 28 adjacent to each other in the circumferential direction of the positive electrode side radiator plate 27 so as to be spaced apart from each other in the circumferential direction. . Here, the positive-side heat radiating plate 27 is made to have a thickness slightly thicker than the thickness of the positive-side rectifying element 22. The positive electrode side element insertion hole 29 has an inner diameter slightly larger than the outer diameter of the positive electrode side rectifying element 22. Furthermore, the drilling position of the positive electrode side element insertion hole 29 is shifted from the center position in the radial direction of the positive electrode heat dissipation plate 27 to the inner diameter side.

  The positive electrode side holding plate 30 is made of an aluminum material and formed into an arc shape having a U-shaped cross section having an outer diameter side as an opening. Here, in the positive electrode side holding plate 30, the bottom of the U-shaped groove 31 has the same radius of curvature as the inner peripheral surface of the positive side radiator plate 27, and the width of the U-shaped groove 31 is as follows. The width of the side heat radiating plate 27 is substantially equal to the plate thickness. The positive electrode side holding plate 30 is formed to have a circumferential length and a radial length covering the three positive electrode side element insertion holes 29 formed between the mounting holes 28 adjacent to each other in the circumferential direction of the positive electrode heat dissipation plate 27. Has been. Further, a notch 32 as a positive electrode side opening through which the positive electrode side lead terminal 25 of the positive electrode side rectifying element 22 is inserted in a non-contact state is formed on one side of the positive electrode side holding plate 30 having a U-shaped cross section.

  In order to assemble the positive-side rectifier 21 configured as described above, first, the positive-side rectifying element 22 in which the conductive adhesive 49 is applied to the outer peripheral surfaces of the positive-side metal base 23 and the positive-side resin mold portion 26 is used. The element is inserted into each of the element insertion holes 29. Next, the conductive adhesive 49 is applied to the back surface of the positive electrode side metal base 23, and the positive electrode side holding plate 30 is attached to the positive electrode side heat radiating plate 27 from the inner diameter side. At this time, the positive lead terminal 25 of the positive rectifier 22 is extended from the notch 32 in a non-contact state. Next, the positive electrode side holding plate 30 is spot welded to the positive electrode side heat radiating plate 27 at a position away from the positive electrode side rectifying element 22, and the positive electrode side holding plate 30 and the positive electrode side heat radiating plate 27 are integrated. The positive electrode side rectifier 21 is assembled by curing.

  In the positive electrode side rectifier 21 assembled in this manner, the positive electrode side rectifying element 22 is accommodated in a loosely fitted state in the positive electrode side element insertion hole 29 whose both openings are closed by the positive electrode side holding plate 30, and a conductive adhesive. 49 is adhered and fixed to the positive-side heat radiating plate 27 and the positive-side holding plate 30. Here, as the conductive adhesive 49, for example, a silver filler added to an epoxy thermosetting resin is used, and electrical conductivity and thermal conductivity are imparted. Therefore, the positive side rectifying element 22 is supported by the positive side heat radiating plate 27 and the positive side holding plate 30 with the conductive adhesive 49 interposed therebetween, and the positive side metal base 23 is supported by the positive side radiating plate 27 and the positive side holding plate. 30 is electrically and thermally connected.

  2 and 7, the negative electrode side rectifier 35 includes a negative electrode side rectifying element 36, a negative electrode side heat radiating plate 40 that supports the negative electrode side rectifying element 36 in an electrically and thermally connected state, And a negative electrode side holding plate 44 that prevents the negative electrode side rectifying element 36 supported by the negative electrode side heat radiating plate 40 from coming off.

  The negative electrode side rectifying element 36 includes a copper negative electrode side metal base 37 made in a disk shape, and a semiconductor pellet as a negative electrode side one-way conducting element disposed with the anode side bonded to the surface of the negative electrode side metal base 37. 24 and a negative electrode side lead terminal 38 connected to the cathode side of the semiconductor pellet 24. The negative electrode side rectifying element 36 is formed into a cylindrical body by embedding the semiconductor pellet 24 disposed on the surface of the negative electrode side metal base 37 by the negative electrode side resin mold part 39, and the negative electrode side lead terminal 38 is made of the negative electrode side metal. It extends from the end surface opposite to the base 37. Here, the negative side unidirectional conducting element is different in only the conducting direction from the positive side unidirectional conducting element, and the same semiconductor pellet 24 as the positive side unidirectional conducting element is used.

  The negative-side heat radiating plate 40 is formed by molding an aluminum material into an arc-shaped flat plate. And the attachment hole 41 is pierced in each of the circumferential direction both ends and center of the negative electrode side heat sink 40. As shown in FIG. Further, three negative electrode side element insertion holes 42 each having a circular hole shape are provided in the circumferential direction of the negative electrode side heat radiating plate 40 so as to be spaced apart from each other in the circumferential direction by three. . Furthermore, a notch 43 for inserting the positive lead terminal 25 of the positive rectifying element 22 in a non-contact state is formed in the negative radiator plate 40. Here, the negative-side heat radiating plate 40 is made to have a thickness slightly thicker than the thickness of the negative-side rectifying element 36. The negative electrode side element insertion hole 42 has an inner diameter slightly larger than the outer diameter of the negative electrode side rectifying element 36. Furthermore, the drilling position of the negative electrode side element insertion hole 42 is shifted from the central position in the radial direction of the negative electrode side radiator plate 40 to the outer diameter side.

  The negative electrode side holding plate 44 is made of an aluminum material and formed into an arc shape having a U-shaped cross section having an inner diameter side as an opening. Here, the negative electrode side holding plate 44 has a radius of curvature equivalent to the outer peripheral surface of the negative electrode side heat radiating plate 40 at the bottom of the groove 45 having a U-shaped cross section. The width is almost the same as the thickness of the heat sink 40. The negative electrode side holding plate 44 is formed to have a circumferential length and a radial length covering the three negative electrode side element insertion holes 42 formed between the mounting holes 41 adjacent in the circumferential direction of the negative electrode side heat radiating plate 40. Has been. Further, a notch 46 through which the negative electrode side lead terminal 38 of the negative electrode side rectifying element 36 is inserted in a non-contact state is formed on one side of the negative electrode side holding plate 44 having a U-shaped cross section.

  In order to assemble the negative electrode side rectifier 35 configured as described above, first, the negative electrode side rectifier element 36 in which the conductive adhesive 49 is applied to the outer peripheral surfaces of the negative electrode side metal base 37 and the negative electrode side resin mold part 39 is connected to the negative electrode side. The element is inserted into each of the element insertion holes 42. Next, the conductive adhesive 49 is applied to the back surface of the negative electrode side metal base 37, and the negative electrode side holding plate 44 is attached to the negative electrode side heat radiating plate 40 from the outer diameter side. At this time, the negative electrode side lead terminal 38 of the negative electrode side rectifying element 36 is extended from the notch 46 in a non-contact state. Next, the negative electrode side holding plate 44 is spot welded to the negative electrode side heat radiating plate 40 at a position away from the negative electrode side rectifying element 36, the negative electrode side holding plate 44 and the negative electrode side heat radiating plate 40 are integrated, and the conductive adhesive 49 is applied. The negative electrode side rectifier 35 is assembled by curing.

  In the negative electrode side rectifier 35 assembled in this way, the negative electrode side rectifier element 36 is accommodated in a loosely fitted state in the negative electrode side element insertion hole 42 whose both openings are closed by the negative electrode side holding plate 44, and a conductive adhesive. 49 is adhered and fixed to the negative-side heat radiating plate 40 and the negative-side holding plate 44. Therefore, the negative side rectifying element 36 is supported by the negative side heat radiating plate 40 and the negative side holding plate 44 with a conductive adhesive 49 interposed, and the negative side metal base 37 is connected to the negative side radiating plate 40 and negative electrode side holding plate. 44 is electrically and thermally connected.

  The positive-side rectifier 21 and the negative-side rectifier 35 assembled in this way are overlapped via a spacer (not shown), and mounting bolts (not shown) passed through the mounting holes 28 and 41 are attached to the rear bracket 3. It is fastened to the inner wall surface. And the negative electrode side heat sink 40 is earth | grounded via the rear bracket 3, and the positive electrode side heat sink 40 is an electrical non-contact state with the negative electrode side heat sink 40. FIG. An output terminal (not shown) is attached to the positive-side heat radiating plate 27. Further, the positive electrode side rectifying element 22 extending from the notch 43 of the negative electrode side heat radiation plate 40 to the rotor 6 side and the notch 46 of the negative electrode side holding plate 44 extend to the rotor 6 side. The negative electrode side lead terminal 38 of the negative electrode side rectifying element 36 is connected. As a result, as shown in FIG. 8, two rectifiers 20A and 20B composed of diode bridges with three rectifier element pairs in which the positive rectifier 22 and the negative rectifier 36 are connected in series are configured. The

  As shown in FIG. 8, the stator coil 12 includes a three-phase AC winding 12A formed by Y-connecting an a-phase winding 12a, a b-phase winding 12b, and a c-phase winding 12c, and a d-phase winding. The winding 12d, the e-phase winding 12e, and the f-phase winding 12f are composed of a three-phase AC winding 12B formed by Y-connection. Each lead wire 48 of the three-phase AC winding 12A is a connection point between the positive rectifying element 22 and the negative rectifying element 36 of each rectifying element pair of the rectifying device 20A, that is, a connecting point of the positive lead terminals 25 and 38. Connected to. Similarly, each lead wire 48 of the three-phase AC winding 12B is a connection point between the positive rectifier element 22 and the negative rectifier element 36 of each rectifier element pair of the rectifier 20B, that is, the connection of the positive lead terminals 25 and 38. Connected to a point.

Next, the operation of the vehicular AC generator 1 configured as described above will be described.
First, a current is supplied from a battery (not shown) to the field coil 8 of the rotor 6 via the brush 16 and the slip ring 15, and a magnetic flux is generated. This magnetic flux forms a magnetic pole in the pole core 9.
On the other hand, the rotational torque of the engine is transmitted to the shaft 7 via a belt (not shown) and the pulley 13, and the rotor 6 is rotated. Therefore, a rotating magnetic field is applied to the stator coil 12 of the stator 10, and an electromotive force is generated in the three-phase AC windings 12 </ b> A and 12 </ b> B constituting the stator coil 12. The three-phase AC voltage output from each output end of the three-phase AC winding 12A is full-wave rectified and output by the rectifier 20A, and is output from each output end of the three-phase AC winding 12B. The voltage is full-wave rectified and output by the rectifier 20B.

At this time, the fan 14 rotates together with the rotor 6. On the front side, outside air is sucked from the intake holes 2 a formed in the end face of the front bracket 2, bent in the centrifugal direction by the fan 14, and discharged from the exhaust holes 2 b provided on the side surfaces of the front bracket 2. The front side coil end of the stator coil 12 is cooled by the flow of the outside air.
On the rear side, outside air is taken in through an intake hole 3 a formed in the end surface of the rear bracket 3, bent in the centrifugal direction by the fan 14, and discharged from an exhaust hole 3 b provided in the side surface of the rear bracket 3. The flow of the outside air cools the rear side coil end of the stator coil 12, the voltage regulator 19, and the rectifying device 20.

  Then, heat generated in the semiconductor pellet 24 of the positive electrode side rectifying element 22 is transmitted from the positive electrode side metal base 23 to the positive electrode side heat radiating plate 27 and the positive electrode side holding plate 30 through the conductive adhesive 49, and the positive electrode side heat radiating plate 27. The heat is radiated from the surface of the positive electrode holding plate 30 to the outside air. On the other hand, heat generated in the semiconductor pellet 24 of the negative electrode side rectifying element 36 is transmitted from the negative electrode side metal base 37 to the negative electrode side heat radiating plate 40 and the negative electrode side holding plate 44 via the conductive adhesive 49, and the negative electrode side heat radiating plate 40. The heat is radiated from the surface of the negative electrode holding plate 44 to the outside air. Thereby, the excessive temperature rise of the rectifier 20 is suppressed.

  According to the first embodiment, the positive-side rectifying element 22 is accommodated in the positive-side element insertion hole 29 in a loosely fitted state, and is bonded to the positive-side heat dissipation plate 37 and the positive-side holding plate 30 by the conductive adhesive 49. The negative electrode side rectifying element 36 is accommodated in the negative electrode side element insertion hole 42 in a loosely fitted state, and is bonded and fixed to the negative electrode side heat radiating plate 40 and the negative electrode side holding plate 44 by a conductive adhesive 49. Therefore, the positive side rectifying element 22 is secured and supported by the positive side heat radiating plate 27 and the positive side holding plate 30 while ensuring an electrical and thermal connection state. Similarly, the negative-side rectifying element 36 is secured and supported by the negative-side heat radiating plate 40 and the negative-side holding plate 44 while ensuring an electrical and thermal connection state.

  Further, stress is not applied to the positive rectifier 22 and the negative rectifier 36 when the positive rectifier 22 and the negative rectifier 36 are inserted into the positive element insertion holes 29 and 42. Further, when the positive electrode side holding plate 30 and the negative electrode side holding plate 44 are attached to the positive electrode side heat radiating plate 27 and the negative electrode side heat radiating plate 40, no stress is applied to the positive electrode side rectifying element 22 and the negative electrode side rectifying element 36. Furthermore, solder bonding is not required, and a thermal load in solder bonding does not occur on the positive rectifier 22 and the negative rectifier 36. Therefore, when the rectifying device 20 is assembled, the semiconductor pellet 24 is not damaged or thermally deteriorated, and the positive-side heat sink 27 and the negative-side heat sink 40 are not deformed, so that the yield can be increased.

  Further, since the positive electrode side holding plate 30 is mounted on the positive electrode side heat radiating plate 27 so as to sandwich the positive electrode side rectifying element 22, the positive electrode accompanying the detachment of the positive electrode side rectifying element 22 from the positive electrode side heat radiating plate 27 and the flying of foreign matter. Occurrence of damage to the side rectifying element 22 is prevented. Similarly, since the negative electrode side holding plate 44 is attached to the negative electrode side heat radiating plate 40 so as to sandwich the negative electrode side rectifying device 36, the negative electrode side rectifying device 36 is detached from the negative electrode side heat radiating plate 40 or a foreign object comes in. The occurrence of damage to the negative electrode side rectifying element 36 is prevented.

  In addition, since the positive electrode side holding plate 30 is mounted on the positive electrode side heat radiating plate 27 so as to accommodate the positive electrode side heat radiating plate 27 in the groove 31 and fixed by spot welding, at a position away from the positive electrode side rectifying element 22. Spot welding can be performed, and thermal deterioration of the positive-side rectifying element 22 can be prevented. Similarly, since the negative electrode side holding plate 44 is mounted on the negative electrode side heat radiating plate 40 so as to accommodate the negative electrode side heat radiating plate 40 in the groove 45 and fixed by spot welding, the position away from the negative electrode side rectifying element 36 Spot welding can be performed, and thermal destruction of the negative electrode side rectifying element 36 can be prevented.

Further, since the positive electrode side and negative electrode side holding plates 30 and 44 are spot-welded to the positive electrode side and negative electrode side heat dissipation plates 27 and 40, the vibration resistance of the positive electrode side and negative electrode side heat dissipation plates 27 and 40 is improved. Therefore, occurrence of peeling of the conductive adhesive 49 due to vibration of the positive electrode side and negative electrode side heat sinks 27 and 40 is suppressed.
Moreover, since the positive electrode side heat sink 27, the positive electrode side holding plate 30, the negative electrode side heat sink 40, and the negative electrode side holding plate 44 are made of aluminum, the weight of the rectifier 20 can be reduced. Further, since there is no need to solder the positive and negative side metal bases 23 and 37 to the positive side heat radiating plate 27, the positive side holding plate 30, the negative side radiating plate 40, and the negative side holding plate 44, There is no need for surface treatment such as nickel plating.

  In the first embodiment, the connection between one side of the positive electrode side and negative electrode side holding plate and the positive electrode side and negative electrode side resin mold part of the positive electrode side and negative electrode side rectifying element is not discussed. You may make it fill with an adhesive agent. In this case, it is desirable to use an electrically insulating adhesive in order to avoid an electrical short circuit between the positive electrode side and negative electrode side holding plates and the positive electrode side and negative electrode side lead terminals.

Embodiment 2. FIG.
FIG. 9 is a cross-sectional view along the circumferential direction of the positive rectifier of the rectifier in the automotive alternator according to Embodiment 2 of the present invention.

In FIG. 9, in the positive side rectifier 21A, the heat radiation fins 50 are erected on the outer peripheral surface of the other side of the positive side holding plate 30A having a substantially U-shaped radial shape at a substantially equiangular pitch.
The other configuration of the second embodiment is the same as that of the first embodiment.

Therefore, this second embodiment can provide the same effect as the first embodiment.
According to the second embodiment, since the radiating fin 50 is erected on the outer peripheral surface of the other side of the positive electrode side holding plate 30A having a U-shaped cross section, the heat radiating area increases, The heat generated is effectively dissipated.

  In the second embodiment, the radiating fins are formed on the positive electrode holding plate. However, in the negative rectifier as well, the radiating fins are radially formed at a substantially equiangular pitch in a U-shaped cross section of the negative electrode holding plate. You may stand upright on the outer peripheral surface of one side. Thereby, the heat generated in the negative electrode side rectifying element is effectively radiated.

Embodiment 3 FIG.
FIG. 10 is a perspective view of the positive rectifier of the rectifier in the automotive alternator according to Embodiment 3 of the present invention viewed from the back side.

In FIG. 10, the positive electrode side holding plate 30B is formed in a U-shaped cross section having a circumferential width that sandwiches one positive electrode side rectifying element (not shown). The positive-side rectifier 21B is configured such that the six positive-side holding plates 30B are respectively connected from the inner diameter side to the positive-side so as to sandwich the positive-side rectifying element applied with the conductive adhesive and inserted into the element insertion holes. The heat sink 27 is mounted, spot welded, and the conductive adhesive is cured. Although not shown, the negative-side rectifier is similarly configured.
The other configuration of the third embodiment is the same as that of the first embodiment.

Therefore, also in the third embodiment, the same effect as in the first embodiment can be obtained.
According to the third embodiment, since the circumferential width of the positive electrode side holding plate 30B is such a length as to sandwich one positive electrode side rectifying element, the volume of the positive electrode side holding plate 30B is reduced. Therefore, since the ventilation resistance of the ventilation path of the outside air that cools the rectifier is reduced, the amount of cooling air (outside air) is increased, and the rectifier can be effectively cooled.

Embodiment 4 FIG.
FIG. 11 is a cross-sectional view taken along the radial direction of the positive rectifier of the rectifier in the automotive alternator according to Embodiment 4 of the present invention.

In FIG. 11, the positive electrode side element insertion hole 29A is a bottomed hole with a circular cross section through which the positive electrode side rectifying element 22 can be inserted in a loosely fitted state, and is recessed so as to open on the surface of the positive electrode side heat radiating plate 27A. ing. The positive electrode side holding plate 30C has a notch 32 for drawing out the positive electrode side lead terminal 25, and is formed as a flat plate that closes the positive electrode side element insertion hole 29A. The positive-side rectifier 21C inserts the positive-side rectifying element 22 coated with the conductive adhesive 49 into each of the positive-side element insertion holes 29A, and extends the positive-side lead terminal 25 from the notch 32 so as to be positive. The positive electrode side holding plate 30C is placed so as to cover the side rectifying element 22, the positive electrode side holding plate 30C is spot welded to the positive electrode side heat radiating plate 27A, and the conductive adhesive 49 is cured. Although not shown, the negative-side rectifier is similarly configured.
The other configuration of the fourth embodiment is the same as that of the first embodiment.

Therefore, also in the fourth embodiment, the same effect as in the first embodiment can be obtained.
According to the fourth embodiment, since the positive electrode side element insertion hole 29A is formed in a bottomed hole, the positive electrode side holding plate covers the positive electrode side rectifying element 22 inserted into the positive electrode side element insertion hole 29A. It is only necessary to fix 30C to the positive-side heat radiating plate 27A, thereby improving the assembling property of the rectifier.

  In the fourth embodiment, the connection between the positive electrode side and negative electrode side holding plates and the positive electrode side and negative electrode side resin mold portions of the positive electrode side and negative electrode side rectifying elements is not discussed, but an adhesive is filled between them. You may make it do. In this case, it is desirable to use an electrically insulating adhesive in order to avoid an electrical short circuit between the positive electrode side and negative electrode side holding plates and the positive electrode side and negative electrode side lead terminals.

Embodiment 5 FIG.
FIG. 12 is a sectional view taken along the circumferential direction of the positive rectifier of the rectifier in the automotive alternator according to Embodiment 5 of the present invention.

In FIG. 12, in the positive rectifier 21 </ b> D, the radiating fins 51 are erected on the back surface of the positive radiating plate 27 </ b> B radially at an equiangular pitch.
The other configuration of the fifth embodiment is the same as that of the fourth embodiment.

Therefore, also in the fifth embodiment, the same effect as in the fourth embodiment can be obtained.
According to the fifth embodiment, since the radiating fins 51 are erected on the back surface of the positive-side radiating plate 27B, the radiating area increases, and the heat generated by the positive-side rectifying element 24 is effectively radiated.

  In the fifth embodiment, the heat radiating fin is formed on the positive side heat radiating plate. However, in the negative side rectifier, the radiating fin is erected on the surface of the negative side heat radiating plate while avoiding the negative electrode side holding plate. May be. Thereby, the heat generated in the negative electrode side rectifying element is effectively radiated.

Embodiment 6 FIG.
FIG. 13: is sectional drawing along the circumferential direction of the positive electrode side rectifier of the rectifier in the alternating current generator for vehicles concerning Embodiment 6 of this invention.

In FIG. 13, in the positive rectifier 21 </ b> E, the back surface of the positive heat radiating plate 27 </ b> C is formed on the uneven surface 52.
The other configuration of the sixth embodiment is the same as that of the fourth embodiment.

Therefore, also in the sixth embodiment, the same effect as in the fourth embodiment can be obtained.
According to the sixth embodiment, since the back surface of the positive-side heat radiating plate 27C is formed on the concavo-convex surface 52, the workability is excellent and the heat-dissipating area is increased as compared with the case where the heat-radiating fins 51 are formed. Heat generated by the side rectifying element 24 is effectively dissipated.

  In the sixth embodiment, the back surface of the positive-side heat radiating plate is formed on the uneven surface. However, the back surface of the negative-electrode-side heat radiating plate may also be formed on the uneven surface in the negative-side rectifier. Thereby, the heat generated in the negative electrode side rectifying element is effectively radiated.

Embodiment 7 FIG.
FIG. 14 is a cross-sectional view of a principal part showing an automotive alternator according to Embodiment 7 of the present invention.

In FIG. 14, the positive-side rectifier 21 and the negative-side rectifier 35 are connected to the extending direction of the positive-side lead terminal 25 of the positive-side rectifying element 22 and the negative-side lead of the negative-side rectifying element 36 via a spacer (not shown). The terminals 38 are overlapped with each other so as to face each other and are fastened and fixed to the inner wall surface of the rear bracket 3 by mounting bolts (not shown). The positive-side lead terminals 25 and 38 are connected and drawn out from the notch 43 of the negative-side radiator plate 40 toward the rotor 6, and are connected to lead wires 48 of each phase of the stator coil 12.
The other configuration of the seventh embodiment is the same as that of the first embodiment.

  Therefore, the same effects as in the first embodiment can be obtained in the seventh embodiment.

Embodiment 8 FIG.
In each of the above embodiments, the positive electrode side and the negative electrode side heat dissipation plate, and the positive electrode side and the negative electrode side holding plate are made of aluminum. However, in this eighth embodiment, the positive electrode side and the negative electrode side heat dissipation plate, and the positive electrode One of the side and negative electrode side holding plates is made of aluminum, and the other is made of copper.
According to the eighth embodiment, an increase in the weight of the rectifier can be suppressed, and the thermal conductivity and conductivity can be improved.

In each of the above embodiments, the positive electrode side and the negative electrode side holding plate are spot welded to the positive electrode side and the negative electrode side heat radiating plate, but the joining method is not limited to spot welding, and friction diffusion A method such as bonding or mechanical clinch may be used.
Further, in each of the above embodiments, the positive electrode side and the negative electrode side rectifying element are prepared in a cylindrical body, but the shape of the positive electrode side and the negative electrode side rectifying element is not limited to a cylindrical body, for example, It may be produced in a rectangular parallelepiped. In this case, the element insertion hole is also formed in an inner shape capable of loosely fitting the positive electrode side and the negative electrode side rectifying element.

  In each of the above embodiments, the positive-side rectifying element is mounted on the positive-side radiator plate while shifting to the inner diameter side, and the negative-electrode-side rectifying element is mounted on the negative-electrode side radiator plate while shifting to the outer diameter side. However, the positive-side rectifying element may be mounted on the positive-side heat sink by shifting to the outer diameter side, and the negative-electrode-side rectifying element may be mounted on the negative-side heat sink by shifting to the inner diameter side. In this case, from the viewpoint of suppressing the enlargement of the positive electrode side and the negative electrode side holding plate, the positive electrode side holding plate is attached to the positive electrode side heat radiating plate from the outer diameter side, and the negative electrode side holding plate is attached to the negative electrode side heat radiating plate from the inner diameter side. It is preferable to do.

In the above embodiment, the positive-side rectifier and the negative-side rectifier are arranged in the axial direction of the rotating shaft so that the negative-side rectifier is positioned on the rotor side. The positive-side rectifier and the negative-side rectifier may be disposed so as to overlap with each other in the axial direction of the rotating shaft so as to be positioned on the side.
In each of the above embodiments, the positive-side rectifier and the negative-side rectifier are arranged so as to overlap in the axial direction of the rotating shaft, but the positive-side rectifier and the negative-side rectifier are concentrically provided side by side in the radial direction. May be.

In each of the above embodiments, each three-phase AC winding constituting the stator coil is configured by Y-connecting three phase windings, but the three-phase AC winding has three phases. The winding may be constituted by Δ connection.
In each of the above embodiments, six positive-side and negative-side rectifiers are mounted on the positive-side and negative-side heat sinks, but the number of positive-side and negative-side rectifiers mounted is here. It is not limited and is appropriately selected depending on the circuit configuration. For example, if the stator coil is composed of one three-phase AC winding in which three phase windings are Y-connected, the number of positive-side and negative-side rectifying elements mounted is three. In addition, when the stator coil is composed of one three-phase AC winding with Y-connection of three phase windings, in addition to the three-phase output, the neutral point output is full-wave rectified. And the number of mounting of the negative electrode side rectifying elements is four.

In each of the above embodiments, the positive electrode side and the negative electrode side heat dissipation plate, and the positive electrode side and the negative electrode side holding plate are made of aluminum or copper. However, the positive electrode side and the negative electrode side heat dissipation plate, the positive electrode side and the negative electrode The material for the side holding plate is not limited to aluminum or copper, but may be a metal.
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.

  6 rotors, 8 field coils, 9 pole cores, 10 stators, 11 stator cores, 12 stator coils, 20 rectifiers, 21, 21A, 21B, 21C, 21D, 21E positive rectifiers, 22 positive rectifiers , 23 Positive side metal base, 24 Semiconductor pellets (positive side and negative side unidirectional elements), 25 Positive side lead terminal, 26 Positive side resin mold part, 27, 27A, 27B, 27C Positive side heat sink, 29, 29A Side element insertion hole, 30, 30A, 30B, 30C Positive side holding plate, 32 Notch (positive side opening), 35 Negative side rectifier, 36 Negative side rectifier, 37 Negative side metal base, 38 Negative side lead terminal, 39 Negative side resin mold part, 40 Negative side heat sink, 42 Negative side element insertion hole, 44 Negative side holding plate, 46 Notch (negative side opening Part), 49 conductive adhesive (positive electrode side and negative electrode side conductive adhesive), 50, 51 radiation fin.

Claims (6)

A stator in which a stator coil is mounted on a cylindrical stator core;
A rotor that is rotatably arranged on the inner peripheral side of the stator core and in which a field coil is mounted on a pole core;
In a rotating electrical machine comprising a rectifier that rectifies the AC output of the stator coil,
The rectifier is
A flat plate-shaped positive-side heat dissipation plate made of metal with a plurality of positive-side element insertion holes formed therein, and both openings of the plurality of positive-side element insertion holes are closed with at least positive-side openings. As described above, the positive electrode side holding plate made of metal fixed to the positive electrode side heat radiating plate, the positive electrode side metal base, and the anode is electrically connected to the positive electrode side metal base and mounted on one surface of the positive electrode side metal base. The positive-side unidirectional conducting element, the positive-side mold resin portion embedding the positive-side unidirectional conducting element, and the cathode-side unidirectional conducting element connected to the cathode of the positive-side unidirectional conducting element and extending from the positive-side mold resin portion A positive-side lead terminal that protrudes, and is loosely fitted in each of the plurality of positive-side element insertion holes closed by the positive-side holding plate, and the positive-side lead terminal is inserted from the positive-side opening. Positive-side rectifier element pulled out and stored When a positive electrode-side conductive adhesive for bonding and fixing the positive electrode side metal base to the positive electrode side radiating plate and the positive electrode side holding plate, and the positive electrode side rectifier consisting of,
A metal flat plate-like negative electrode side heat sink having a plurality of negative electrode side element insertion holes formed therein, and both openings of the plurality of negative electrode side element insertion holes having at least a negative electrode side opening portion are plugged. As described above, the negative electrode side holding plate made of metal fixed to the negative electrode side heat radiating plate, the negative electrode side metal base, and the cathode is electrically connected to the negative electrode side metal base and mounted on one surface of the negative electrode side metal base. The negative electrode side one-way conducting element, the negative electrode side mold resin portion embedding the negative electrode side one-way conducting element, and the anode of the negative electrode side one-way conducting element are electrically connected to and extended from the negative electrode side mold resin portion. The negative electrode side lead terminal is provided in a loosely fitted state in each of the plurality of negative electrode side element insertion holes closed by the negative electrode side holding plate, and the negative electrode side lead terminal is inserted from the negative electrode side opening. Negative side rectifier element pulled out and stored When the rotating electrical machine, characterized in that it comprises a negative electrode side conductive adhesive for bonding and fixing the negative electrode side metal base to the negative electrode side radiating plate and the negative electrode side holding plate, a negative electrode side rectifier consisting of, a.   2. The rotating electrical machine according to claim 1, wherein a radiation fin is formed on at least one of the positive electrode side holding plate and the negative electrode side holding plate. A stator in which a stator coil is mounted on a cylindrical stator core;
A rotor that is rotatably arranged on the inner peripheral side of the stator core and in which a field coil is mounted on a pole core;
In a rotating electrical machine comprising a rectifier that rectifies the AC output of the stator coil,
The rectifier is
A flat plate-shaped positive-side heat dissipation plate made of metal with a plurality of bottom-side positive-electrode-side element insertion holes recessed, and the openings of the plurality of positive-side element-insertion holes having at least a positive-side opening. A positive electrode side holding plate made of metal fixed to the positive electrode side heat dissipation plate, and a positive electrode side metal base, and an anode is electrically connected to the positive electrode side metal base, and one surface of the positive electrode side metal base The positive-side unidirectional conducting element mounted on the positive-electrode side mold resin part embedded in the positive-side unidirectional conducting element, and the positive-side mold resin part electrically connected to the cathode of the positive-side unidirectional conducting element A positive-side lead terminal extending from the positive-side holding plate and loosely fitted in each of the plurality of positive-side element insertion holes, and the positive-side lead terminal is open to the positive-side opening Positive side adjustment An element, the positive electrode-side conductive adhesive to the positive electrode side metal base is bonded and fixed to the positive electrode side radiating plate, and the positive electrode side rectifier consisting of,
A metal flat plate-like negative electrode side heat sink having a plurality of bottomed negative electrode side element insertion holes recessed, and at least the negative electrode side opening portions are filled with the openings of the plurality of negative electrode side element insertion holes. A negative electrode side holding plate made of metal fixed to the negative electrode side heat dissipation plate, and a negative electrode side metal base, and a cathode is electrically connected to the negative electrode side metal base, and one surface of the negative electrode side metal base Negative electrode side unidirectional conducting element, negative electrode side mold resin part embedded in the negative electrode side unidirectional conducting element, and negative electrode side mold resin part electrically connected to the anode of the negative electrode side unidirectional conducting element A negative-side lead terminal extending from the negative-side holding plate, which is loosely fitted in each of the plurality of negative-side element insertion holes, and is open to the negative-side lead terminal. Negative side adjustment Rotating electric machine, characterized in that it comprises an element, a negative electrode side conductive adhesive to the negative electrode side metal base is bonded to the negative electrode side heat sink and the negative electrode side rectifier consisting of, a.   4. The rotating electrical machine according to claim 3, wherein a radiating fin is formed on at least one of the positive-side radiating plate and the negative-side radiating plate.   The said positive electrode side heat sink, the said positive electrode side holding plate, the said negative electrode side heat sink, and the said negative electrode side holding plate are aluminum, The rotation of any one of Claim 1 thru | or 4 characterized by the above-mentioned. Electric.   One of the positive electrode side heat sink and the negative electrode side heat sink, the positive electrode side holding plate and the negative electrode side holding plate is made of aluminum, and the other is made of copper. The rotating electrical machine according to any one of claims.

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