KR20110002401A - Dynamo-electric machine - Google Patents

Abstract

PURPOSE: A rotary electric machine is provided to improve the heat dissipation of a rectifier element by reducing thermal resistance between the rectifier element and a heat sink. CONSTITUTION: A shaft(4) is rotatably supported in a case. A rotor(5) is fixed to the shaft. A stator core(12) is fixed to the inner wall of the case. A stator(6) is comprised of a stator coil wound around the stator core. A rectifier element(17) is electrically connected to the stator coil. A heat sink(16) discharges heat from the rectifier element.

Description

Rotary Electric Machines {DYNAMO-ELECTRIC MACHINE}

The present invention relates to a rotary electric machine having a rectifier for rectifying alternating current into direct current.

A rectifier of a conventional automotive alternator, comprising a plurality of rectifier elements, a metal positive electrode side heat sink fin and a negative electrode side heat sink fin, which are electrically and mechanically connected to each other, and are provided with a positive electrode side heat sink fin and a negative electrode side heat sink fin. It is known that the rectifying element is press-fitted into the through-holes formed in the respective holes (see Patent Document 1, for example).

In this case, the bottom face of the rectifying element press-fitted into the through-hole is in contact with the corrugated heat dissipation fin arranged in the ventilation path of the cooling wind generated by the rotation of the cooling fan, and the heat dissipation of the rectifying element is achieved.

Patent Document 1: Japanese Patent Application Laid-Open No. 2006-149039 (Fig. 4)

However, the rectifier of the vehicular alternator having the above-described configuration needs to closely contact the main side surface of the rectifying element and the inner circumferential wall surface of the through hole in order to increase the heat dissipation of the rectifying element, and the rectifying element has a through hole therefor. There is a problem in that the rectifying element may be damaged due to excessive load being applied to the rectifying element in the press fitting process.

In addition, in the rectifier element, the bottom face is in linear contact with the wave-shaped heat dissipation fin, and the contact area is small, so that the thermal resistance between the rectifier element and the heat dissipation fin is increased, and the heat dissipation of the rectifier element is low. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a rotary electric machine in which breakage when attaching a rectifying element to a heat sink is reduced, and the heat dissipation of the rectifying element of the rectifying device is greatly improved. It aims to do it.

The rotating electric machine according to the present invention includes a case, a shaft rotatably supported by the case, a rotor fixed to the shaft, a stator core fixed to the inner wall surface of the case, and a stator coil recommended for the stator core. And a rectifier having a stator configured to be electrically connected to the stator coil and rectifying alternating current into a direct current, and a heat sink radiating the rectifying element, wherein the rectifying element is interviewed on a surface of the heat sink. It has a moist base, the semiconductor element chip mounted in this base, and the attachment part which protruded from the said base to the said heat sink side, this attachment part engages with a heat sink, and a rectifying element is attached to a heat sink. .

According to the rotary electric machine according to the present invention, since the attachment portion of the rectifying element is fitted to the heat sink and the rectifying element is attached to the heat sink, breakage when attaching the rectifying element to the heat sink is reduced.

In addition, since the base of the rectifying element is in surface contact with the surface of the heat sink, the thermal resistance between the rectifying element and the heat sink is reduced, and the heat dissipation of the rectifying element is improved.

EMBODIMENT OF THE INVENTION Hereinafter, although embodiment of this invention is described based on drawing, in each drawing, the same or equivalent member, a site | part is attached | subjected and demonstrated with the same code | symbol.

Embodiment 1.

1 is an exploded perspective view showing a main portion of a vehicle alternator according to Embodiment 1 of the present invention, and FIG. 2 is a diagram illustrating a relationship between the negative electrode side heat sink 18 and the negative electrode side rectifying element 19 in FIG. 1.

The vehicle alternator includes a case composed of an aluminum rear bracket (1) and a front bracket (not shown), and a rear bearing (3) fitted to a bearing housing (2) of the rear bracket (1). ) And a shaft 4 which is rotatably supported by a front bearing (not shown) attached to a bearing housing portion (not shown) of the front bracket and fixed to one end with a pulley (not shown). Equipped.

In addition, the vehicle alternator includes a runner-type rotor (5) fixed to the shaft (4), a stator (6) fixed to the inner wall surface of the case, and an end opposite to the pulley of the shaft (4). A slip ring 7 which is fixed to the rotor 5 and supplies a current to the rotor 5, a pair of brushes (not shown) whose front end slides on the slip ring 7, and is electrically connected to the stator 6, A rectifier 8 for rectifying the alternating current generated by the stator 6 into a direct current, and a voltage regulator (not shown) which controls and regulates the alternating voltage generated by the stator 6 within a predetermined range.

The rotor 5 includes a rotor coil 9 that generates a magnetic flux by flowing a current, a pole core 10 formed of a pair of pole-shaped magnetic poles provided to cover the rotor coil 9, and a pole core. The cooling fan 11 fixed by welding is welded to the both main surfaces of the axial direction of (10).

The stator 6 has a stator core 12 and a wire wound around the stator core 12 so that alternating current is generated by the change of the magnetic flux from the rotor coil 9 with the rotation of the rotor 5. The stator coil 13 is provided. The lead wire 14 drawn out from the stator coil 13 is electrically connected to the rectifier 8 through the terminal block 15 and the common line 35.

The rectifier 8 includes a positive electrode side heat sink 16 and a positive electrode side rectifying element 17 fixed to the positive electrode side heat sink 16, a negative electrode side heat sink 18, and the negative electrode side heat sink 18. The negative electrode side rectification element 19 fixed to () is provided.

The positive electrode side heat sink 16 and the negative electrode side heat sink 18 are both made of aluminum.

The positive electrode side heat sink 16 includes a rectangular positive electrode side heat sink body 20, a plurality of fins 21 arranged on the rear surface of the positive electrode side heat sink body 20, and a heat sink body 20. Fixing parts (not shown) are provided on both sides of the.

The negative electrode side heat sink 18 includes a rectangular negative electrode side heat sink main body 22 which faces the positive electrode side heat sink main body 20 in parallel with the negative electrode side heat sink main body 22, and a plurality of them arranged on the rear surface of the negative electrode side heat sink main body 22. Pins 23 and fixing parts 40 provided on both sides of the negative electrode side heat sink main body 22.

The negative electrode side rectifying element 19 illustrated in FIG. 2 includes a conductive base 24, a semiconductor element chip 25 soldered to the base 24, and a semiconductor element chip 25 on the base 24. Resin package 26 to cover, the insertion part 27 which is the attachment part extended to the opposite side of the semiconductor element chip 25, and the lead-out terminal connected to the semiconductor element chip 25 with the front-end part led out from the resin package 26 to the outside. (28) is provided.

The inserting portion 27 is formed of copper (copper) integrally with the base 24. The inserting portion 27 has a vertical knurl in its base portion as shown in FIG. (29) is formed.

The insertion portion 27 is inserted into the insertion hole 30 formed at the position corresponding to the pin 23.

The positive electrode side rectifying element 17 also has the same configuration as the negative electrode side rectifying element 19, and has a conductive base 31, a semiconductor element chip (not shown), a resin package 32, an inserting portion 33, and a lead-out. A terminal (not shown) is provided.

Moreover, a vertical wrinkle board (not shown) is formed in the base part of the insertion part 33, and the insertion part 33 is inserted in the insertion hole (not shown) formed in the position corresponding to the pin 21. As shown in FIG.

The positive electrode side heat sink 16 and the negative electrode side heat sink 18 face each other with the fins 21 and 23 behind, and are fixed in the case.

That is, the fixing part of the positive electrode side heat sink 16 and the fixing part 40 of the negative electrode side heat sink 18 overlap with each other through an insulator (not shown), and the bolt penetrates the fixing part 40 so that the rear bracket ( It is screwed into 1) and fixed.

The negative electrode side rectifying element 19 and the positive electrode side rectifying element 17 are connected to a common line 35 electrically connected to the lead wire 14 derived from the terminal block 15, and the negative electrode side rectifying element 19 ) Is grounded through the rear bracket 1.

The negative electrode side rectifying elements 19 and the positive electrode side rectifying elements 17 arranged in a line are shifted to face each other. That is, the center axis line of the insertion part 33 of the opposing positive electrode side rectification element 17 is centered on the center line which passes through the center point between the center axis lines of each insertion part 27 of the adjacent negative electrode side rectification elements 19. In order to coincide, the negative electrode side rectifying element 19 and the positive electrode side rectifying element 17 are disposed.

In addition, as shown in FIG. 4, an insertion hole may be formed between the adjacent fins 23 of the negative electrode side heat sink 18, and the insertion portion 27 may be inserted into the insertion hole.

In this case, after temporarily inserting the insertion portion 27 of the negative electrode side rectifying element 19 into the negative electrode side heat sink 18, the assembly is carried out by grasping the tip end portion of the insertion portion 27 from the tip side of the fin 23. It is also possible to complete. In that case, since the longitudinal wrinkle board 29 is formed in the base part, the insertion part 27 is inserted smoothly without rotation.

In addition, by forming the tip portion of the insertion portion 27 into a shape suitable for holding the insertion hole in a range through which the insertion hole passes, it is unnecessary to press the base 24 with a press-fit plunger or the like, so that the negative electrode side heat sink of the negative electrode side rectifying element 19. The damage at the time of the attachment process to (18) can be reduced.

As shown in FIG. 5, an insertion hole 30A is formed between adjacent fins 23 of the negative electrode side heat sink 18, and the negative electrode side rectifying element 19A is inserted into the insertion hole 30A. The part 27A may be loosely fitted, and the fixture 36 may be attached to the end of the insertion part 27A.

The positive electrode side heat sink 16 and the positive electrode side rectifying element 17 also have the same fins 21 adjacent to the positive electrode side heat sink 16 as with the negative electrode side heat sink 18 and the negative electrode side rectifying element 19. An insertion hole may be formed between the two holes, and the insertion portion 27 may be inserted into the insertion hole.

In addition, an insertion hole may be formed between the adjacent fins 21 of the positive electrode side heat sink 16, the insertion part may be loosely inserted in this insertion hole, and the fixing tool may be attached to the end of the insertion part.

Next, operation | movement of the vehicular alternator of the said structure is demonstrated.

First, electric current is supplied from the battery (not shown) to the rotor coil 9 of the rotor 5 via the brush and slip ring 7, and magnetic flux is generated. By this magnetic flux, the pole core 10 is magnetized to the north pole and the south pole alternately in the circumferential direction.

On the other hand, the rotational torque of the engine is transmitted to the shaft 4 through the belt (not shown) and the pulley, and the rotor 5 is rotated. Then, a magnetic field is given to the stator coil 13 of the stator 6, and an electromotive force is generated in the stator coil 13.

The electromotive force of this alternating current is rectified by DC current by the rectifier 8, and a battery is charged or it is supplied to an electrical load.

At this time, the cooling fan 11 is driven to rotate by the rotation of the rotor 5, and the cooling air is taken into the rear bracket 1 from the intake hole 37 drilled into the rear bracket 1. The cooling air intaken into the rear bracket 1 flows between the pins 21 and 23 along the axial direction, and is then bent radially outward by the cooling fan 11, thereby It exhausts out the rear bracket 1 from the exhaust hole (not shown) drilled in the side surface.

Moreover, even in the front bracket which is not shown in figure, cooling wind is inhaled from the intake hole perforated in the cross section of the front bracket, it bends radially outward by a fan, and it exhausts out from a front bracket from the exhaust hole punched in the side surface of a front bracket.

As described above, according to the on-vehicle alternator according to the present embodiment, the rectifier elements 17, 19, and 19A include the bases 24 and 31 in surface contact with the surfaces of the heat sinks 16 and 18, and the bases. A semiconductor element chip 25 mounted on (24, 31) and insertion portions 27, 27A which are attachment portions protruding from the bases 24, 31 toward the heat sinks 16, 18, and the insertion portion 27 , 27A is fitted to the heat sinks 16, 18, and the rectifying elements 17, 19, 19A are attached to the heat sinks 16, 18, and the bases of the rectifying elements 17, 19, 19A The surfaces 24 and 31 are in surface contact with the heat sinks 16 and 18, and the heat generated by the rectifying elements 17, 19 and 19A is efficiently discharged to the outside through the heat sinks 16 and 18.

Moreover, since the size of the cross section cut | disconnected along the perpendicular | vertical direction with respect to an axis line is smaller than the size of the surface of the base 24 and 31 which contacted the heat sink 16 and 18 in the insertion part 27 and 27A, it is inserted. The diameter of the hole 30 may be small, and the rectifying elements 17, 19, 19A are easily attached to the heat sinks 16, 18 by inserting the insertion portions 27, 27A into the insertion holes 30. .

In addition, since the insertion part 27 is inserted into the fins 21 and 23 of the heat sinks 16 and 18 and is integrated with the fins 21 and 23, the heat generation of the rectifying elements 17 and 19 generates a base. 24, it passes through the insertion part 27, and is transmitted to the pins 21 and 23 reliably.

In addition, since the insertion part 27 is comprised from copper which is higher in heat conduction efficiency than the aluminum which comprised the pins 21 and 23, the pins 21 and 23 into which the insertion part 27 was inserted are comprised from the adjacent aluminum. The heat dissipation effect higher than the fins 21 and 23 can be obtained.

An insertion hole 30A is formed between the adjacent fins 21 and 23 of the heat sinks 16 and 18, and the insertion part 27A is loosely inserted in this insertion hole 30A, and the insertion part 27A is provided. In the case where the fixing tool 36 is to be attached to the end portion thereof, there is no need to press-fit the insertion portion 27A into the insertion hole 30A, and damage to the rectifying element 19A in the pressing step is reduced.

In addition, since the positive electrode side rectifying element 17 and the negative electrode side rectifying elements 19 and 19A face each other by shifting in the column direction, the positive electrode side heat sink 16 and the negative electrode side heat sink 18 approach each other. By increasing the height of each fin 21, 23 by that much, the heat dissipation performance of the heat sinks 16, 18 improves more.

In addition, since the bases 31 and 24 and the attachment portions 27, 27A and 33 of the positive electrode side rectifying element 17 and the negative electrode side rectifying elements 19 and 19A are integrally formed of copper, the semiconductor element The heat generated from the chip 25 is smoothly transmitted to the positive electrode side heat sink 16 and the negative electrode side heat sink 18 through the bases 31 and 24 and the attachment portions 27, 27A and 33.

Embodiment 2:

FIG. 6: is a side view which shows the negative electrode side rectification element 19B of the vehicle alternator in Embodiment 2 of this invention.

The negative electrode side rectifying element 19B is bonded with a U-shaped insertion portion 27B, which is an attachment portion, to the bottom surface of the base 24. By inserting this insertion part 27B into the insertion hole 30B and caulking deformation of the exposed front end part, as shown in FIG. 7, the negative electrode side rectification element 19B is a block-shaped negative electrode side heat sink 18B. ) Is attached.

In the present embodiment, the negative electrode side rectifying element 19B can be easily attached to the negative electrode side heat sink 18B without performing a welding operation such as solder.

In addition, at the time of attaching the negative electrode side rectifying element 19B, excessive stress is not applied to the site except for the insertion portion 27B of the negative electrode side rectifying element 19B, and the reliability is improved.

The positive electrode side rectifying element also has the same configuration as the negative electrode side rectifying element 19B, and the description thereof is omitted.

In addition, another structure is the same as that of Embodiment 1.

In addition, as shown in FIG. 8, with respect to the negative electrode side rectifying element 19B, the peripheral part of the front-end | tip part of the insertion part 27B is bent using the negative electrode side heat sink 18C by which it is bent as shown by the arrow. The negative electrode side rectifying element 19B may be attached to the negative electrode side heat sink 18C.

As in the first embodiment, the negative electrode side rectifying element 19B, the base 24, and the insertion portion 27B may be integrally formed.

The positive electrode side heat sink in which the positive electrode side rectifying element is provided is also similar to the negative electrode side heat sink 18C, and the description thereof is omitted.

Embodiment 3.

9 is a sectional view of an essential part of an automotive alternator according to Embodiment 3 of the present invention, and FIG. 10 is an exploded perspective view of the main part of FIG. 9.

In this embodiment, each of the resin packages 26A and 32A of the positive electrode side rectifying element 17C and the negative electrode side rectifying element 19C has a rectangular parallelepiped shape. The other configuration is the same as that of the first embodiment.

In the present embodiment, since the positive electrode side rectifying element 17C and the negative electrode side rectifying element 19C have a rectangular parallelepiped shape, when the insertion portions 27 and 33 are inserted into the insertion hole 30, the positive electrode side rectifying element The 17C and the negative electrode side rectifying elements 19C are easy to hold, and the alignment work of the lead terminals 28 can be simplified.

In addition, as shown in FIG. 11, the insertion hole 30C is made into a long hole shape, The insertion part 27C inserted into this insertion hole 30C is made into the rectangular flat plate, and is inserted into the insertion hole 30C. You may make it insert 27C of insertion parts.

In this case, relative positions are determined at the time when the positive electrode side rectifying element 17C and the negative electrode side rectifying element 19C are attached to the positive electrode side heat sink and the negative electrode side heat sink 18D. That is, like the insertion parts 27 and 33 which have a circular cross-sectional shape, there is no possibility of the position shift of the circumferential direction after insertion.

Moreover, in each said embodiment, the positive electrode side heat sink main body 20 and the negative electrode side heat sink main body 22 are rectangular shape, and each fin 21 and 23 is arrange | positioned in parallel with each other, and the rear bracket 1 Cooling wind penetrated into the case from the intake hole 37 of the () is flowing along the opposing pins (21, 23), but is not limited to this.

For example, an arc-shaped heat sink main body may be arranged around the shaft, and a plurality of fins may be placed in the heat sink main body. Also,

As shown in FIG. 12, the arc-shaped negative electrode side heat sink main body 22A is arrange | positioned centering on a shaft, and the some fin 23A is entered in the negative electrode side heat sink main body 22A in a radiation shape. You may also do so. The same applies to the positive electrode side heat sink.

Further, in the vehicle alternator configured by integrating the heat sink of the rectifying device into a surface contact with the case, the rectifying element of the present invention may be attached to the heat sink in surface contact.

In addition, although each said embodiment demonstrated the automotive alternator, this invention is not limited to a vehicle of course, but can also be applied also to an electric motor.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional side view of an essential part of an automotive alternator according to Embodiment 1 of the present invention;

FIG. 2 is an exploded perspective view showing a relationship between the negative electrode side heat sink and the negative electrode side rectifying element of FIG. 1;

FIG. 3 is a front view showing the rectifying element of the rectifying device of FIG. 1. FIG.

FIG. 4 is a cross-sectional view illustrating an insertion part of a rectifying element embedded in a cooling fin of FIG. 1. FIG.

FIG. 5 is a sectional view of another example of the rectifying device of FIG. 1. FIG.

Fig. 6 is a front view showing the rectifying element of the rectifying device according to Embodiment 2 of the present invention.

FIG. 7 is a cross-sectional view illustrating an example in which the rectifying element of FIG. 6 is attached to a heat sink. FIG.

FIG. 8 is a sectional view showing an aspect in which a rectifying element is mounted to a heat sink, which is another example from FIG. 6; FIG.

Fig. 9 is a sectional side view of an essential part of a vehicular alternator according to Embodiment 3 of the present invention;

10 is an exploded perspective view illustrating a relationship between the negative electrode side heat sink and the negative electrode side rectifying element of FIG. 9;

FIG. 11 is an exploded perspective view showing a relationship between a negative electrode side heat sink and a negative electrode side rectifying element according to another example of FIG. 9; FIG.

12 is a perspective view of a heat sink illustrating another example of the heat sink of FIG. 1.

4: shaft

5: rotor

6: stator

8: rectifier

9: stator coil

12: stator core

13: stator coil

16: positive electrode side heat sink

17, 17C: positive electrode side rectifier

18, 18B, 18C, 18D: negative side heat sink

19, 19A, 19B, 19C: negative electrode side rectifier

20, 20A: positive side heat sink main body

21, 23, 23A: pin

22, 22A: negative side heat sink main body

24, 31: base

25: semiconductor device chip

Resin Package: 26, 26A, 32, 32A

27, 27A, 27B, 27C, 33: insertion part (attachment part)

30, 30A, 30B: insertion hole

36: Fixture

Claims (12)

With the case, A shaft rotatably supported in this case, The rotor fixed to this shaft, A stator composed of a stator core fixed to an inner wall of the case and a stator coil recommended for the stator core, And a rectifying device electrically connected to the stator coil and having a rectifying device for rectifying alternating current into a direct current and a heat sink for radiating the rectifying device. The rectifying element has a base in surface contact with the surface of the heat sink, a semiconductor element chip mounted on the base, and an attachment portion protruding from the base to the heat sink side, wherein the attachment portion is engaged with the heat sink and rectified. A rotary electric machine, wherein the element is attached to a heat sink. The method of claim 1, And said attaching portion has a size of a cross section cut along a direction perpendicular to an axis line than a size of a surface of the base in surface contact with the heat sink. The method according to claim 1 or 2, A plurality of fins are provided on a surface on the side opposite to the surface on which the rectifying element is attached to the heat sink, and the attachment portion is inserted into the fin and integrated with the fin. The method according to claim 1 or 2, And said attaching portion is bent in a tip portion inserted into said heat sink and exposed to the outside, and said rectifying element is attached to said heat sink. The method according to claim 1 or 2, The heat sink is a rotary electric machine, characterized in that the peripheral portion of the front end portion of the attachment portion inserted into the heat sink is bent, and the rectifying element is attached to the heat sink. The method according to claim 1 or 2, And the attachment portion is attached to the heat sink by a fixture fixed to the end exposed to the outside, wherein the rectifying element is attached to the heat sink. The method according to claim 1 or 2, And the attachment portion is made of a material having a higher thermal conductivity than the heat sink. The method according to claim 1 or 2, The base and the attachment portion is a rotary electric machine, characterized in that formed integrally with the same member. The method according to claim 1 or 2, The rectifying device is a rotary electric machine, characterized in that the rectangular parallelepiped shape. The method according to claim 1 or 2, And said attaching portion is a rectangular flat plate shape, and said attaching portion is inserted into an elongated insertion hole formed in said heat sink. The method according to claim 1 or 2, The heat sink is a positive electrode side heat sink and a negative electrode side heat sink facing the positive electrode side heat sink, The rectifying elements are a plurality of positive electrode side rectifying elements arranged in a line at the positive electrode side heat sinks at intervals and a plurality of negative electrode side rectifying elements arranged in a line at the negative electrode side heat sinks at intervals; Each of the positive electrode side rectifying element and the negative electrode side rectifying element is shifted in the column direction to face each other. The method according to claim 1 or 2, The rotating electric machine is a rotating electric machine, characterized in that the vehicle alternator.

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