CN114825780A

CN114825780A - Rotating electrical machine

Info

Publication number: CN114825780A
Application number: CN202210042633.3A
Authority: CN
Inventors: 峰雪徹也; 立木宏纪; 户塚文贵; 桑原克毅
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2021-01-27
Filing date: 2022-01-14
Publication date: 2022-07-29
Also published as: JP7134270B2; JP2022114494A

Abstract

A rotating electric machine, heat dissipation of a terminal plate and a terminal of a coil of a stator has not been considered in the past. If the terminal plate and the terminal continue to be in an overheated state, the function may be deteriorated and the life may be shortened. The rotating electric machine of the present application includes: a stator in which coils are arranged in an annular shape; a bottomed cylindrical housing that surrounds the stator; the annular wiring board is arranged on one axial side of the stator and is electrically connected with the coil; and a terminal electrically connected to the wiring board and disposed outside the housing via an insulator.

Description

Rotating electrical machine

Technical Field

The present application relates to a rotating electric machine.

Background

The rotating electric machine is desired to be small and lightweight. In order to simplify electrical connection of a coil of a stator (stator) provided so as to surround an outer periphery of a rotor (rotor), and to achieve reduction in size and weight, a technique of providing an annular terminal plate is disclosed. An annular terminal plate is provided for each of the coils of the plurality of phases wound around the stator core (stator core), the terminal plate being provided over the entire circumference on one axial end surface of the stator core, and the terminal plate being configured to supply current to the coils for each phase. The electrodes of the coils are connected to the wiring board at a short distance for each phase, and each phase of current can be supplied to the wiring board. With this configuration, the connection of the electrodes of the coil can be simply and compactly achieved. (for example, see patent documents 1 and 2).

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2009-247059

Patent document 2: japanese patent laid-open No. 2006 and 158199

Disclosure of Invention

Technical problem to be solved by the invention

The rotating electric machines described in patent documents 1 and 2 are provided with terminal plates provided for each phase for distributing power to the coils of each phase, and terminals for supplying current to the terminal plates. However, heat dissipation of the wiring board and the terminals is not considered. In a terminal plate and a terminal for supplying power to a coil of each phase through which a large current flows, if an overheated state continues, the overheated state may cause deterioration of functions and a reduction in life. Therefore, it is desired to improve heat dissipation properties of the terminal plate and the terminal in preparation for an improvement in output of the rotating electric machine.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a rotating electric machine capable of improving heat dissipation of a power supply unit and achieving high output.

Technical scheme for solving technical problem

The rotating electric machine of the present application includes:

a stator in which coils are arranged in an annular shape;

a bottomed cylindrical housing that surrounds the stator;

the annular wiring board is arranged on one axial side of the stator and is electrically connected with the coil; and

and a terminal electrically connected to the wiring board and disposed outside the housing via the insulator.

Effects of the invention

According to the rotating electric machine of the present application, the terminal electrically connected to the terminal block is in contact with the outside of the housing via the insulator, and heat is guided from the terminal to the housing, thereby improving heat dissipation from the terminal or the terminal block. This suppresses overheating of the terminal plate and the terminal for supplying power to the coil of each phase, and increases the output of the rotating electric machine.

Drawings

Fig. 1 is a sectional view of a rotating electric machine according to embodiment 1.

Fig. 2 is a perspective view of a stator of a rotating electric machine according to embodiment 1.

Fig. 3 is a perspective view of a coil of a stator of a rotating electric machine according to embodiment 1.

Fig. 4 is a perspective view of an insulator of a stator of a rotating electric machine according to embodiment 1.

Fig. 5 is a plan view of an insulator of a stator of a rotating electric machine according to embodiment 1.

Fig. 6 is a perspective view of a terminal plate of a stator of a rotating electric machine according to embodiment 1.

Fig. 7 is an enlarged view of a terminal plate of a stator of a rotating electric machine according to embodiment 1.

Fig. 8 is a first assembly diagram of a stator of a rotating electric machine according to embodiment 1.

Fig. 9 is a second assembly diagram of a stator of a rotating electric machine according to embodiment 1.

Fig. 10 is a first sectional view of an insulator of a stator of a rotating electric machine according to embodiment 1.

Fig. 11 is a third assembly diagram of a stator of a rotating electric machine according to embodiment 1.

Fig. 12 is a second sectional view of an insulator of a stator of a rotating electric machine according to embodiment 1.

Fig. 13 is a perspective view of a terminal of a stator of a rotating electric machine according to embodiment 1.

Fig. 14 is a perspective view of a plate portion of a stator of a rotating electric machine according to embodiment 1.

Fig. 15 is a first assembly diagram of the terminal and the plate portion of the rotary electric machine of embodiment 1.

Fig. 16 is a second assembly diagram of the terminal and the plate portion of the rotating electric machine of embodiment 1.

Fig. 17 is a sectional view showing connection between a terminal and a frame of the rotating electric machine according to embodiment 1.

Fig. 18 is a first sectional view of the rotating electric machine according to embodiment 2.

Fig. 19 is a second sectional view of the rotating electric machine according to embodiment 2.

Fig. 20 is a sectional view showing connection between a terminal and a frame of a rotating electric machine according to embodiment 3.

Fig. 21 is a sectional view showing connection between a terminal and a frame of a rotating electric machine according to embodiment 4.

(symbol description)

100. 100a, 100b, 100c, 100d rotary electric machines; 210. 210a, 210b housing; 215 a refrigerant flow path; 220. 220a, 220b frames; 222a, 222b cylindrical parts, 223a, 223b sleeve parts; 300 a stator; 310 coils of wire; 311. 311a insulating member; 320 patch panels; 321 a coil connecting portion; 322 a power supply unit; 323 a fixed part; 340. 340a terminal; 342 a terminal block connection portion; 343 a power supply side connecting portion; 344. 344a plate-like end portion; 350 plate portion; 351 a recess; 360. 360a insulator.

Detailed Description

Hereinafter, embodiments of the present application will be described with reference to the drawings.

1. Embodiment mode 1

< Structure of rotating Electrical machine >

Fig. 1 is a cross-sectional view of a rotating electric machine 100 according to embodiment 1, taken along the axial center of a rotating shaft 401. Rotating electric machine 100 is surrounded by a case 210, and case 210 is configured by a bottomed cylindrical frame 220 and an end plate 212 that closes an opening of frame 220. The stator 300 is fixed to the cylindrical portion of the frame 220 in an embedded state. The stator 300 is also referred to as a stator. The rotor 400 is rotatably supported by the bottom of the frame 220 and the end plate 212 via a bearing 2. The rotor 400 is also referred to as a rotating body. The rotor 400 is disposed on the inner circumferential side of the stator 300.

The stator 300 includes: a plurality of coils 310 generating magnetic flux; and a terminal plate 320 that distributes current to the plurality of coils 310. The stator core 330, through which magnetic flux flows, is divided into a plurality of pole teeth 331. The coil 310 is formed by winding the winding 312 for each pole tooth 331. The stator 300 has coils 310 for each of a plurality of phases, and power is supplied for each phase from a terminal plate 320 provided for each phase. Fig. 1 illustrates a case of a rotating electric machine having coils of three phases. However, the technique described in the present application is also applicable to a two-phase rotating electrical machine and a four-phase or more rotating electrical machine. The coil 310, the terminal plate 320, and the stator core 330 are electrically insulated by insulators 311, respectively.

Terminal plate 320 is provided on one side (upper side in fig. 1) in the axial direction of annular stator 300. A plate-shaped terminal 340 for supplying power to the terminal plate 320 is connected to the terminal plate 320. The terminals 340 are held in contact with the outer circumferential side of the frame 220, which is the container of the stator 300. The terminal 340 is provided with a power supply side connection portion 343 (fig. 3, illustration of the power supply line is omitted) to which a power supply line (for example, a connection line connected to the inverter) from the outside is connected.

The rotor 400 is a permanent magnet rotor. A rotating shaft 401 is inserted into a cylindrical rotor core 402 at its axial center position. Permanent magnets 403 are embedded on the outer peripheral surface side of rotor core 402. The permanent magnets 403 are arranged at a predetermined pitch in the circumferential direction to form magnetic poles.

The rotor 400 is not limited to the permanent magnet rotor described above, and a so-called cage rotor in which uninsulated rotor conductors are accommodated in slots of the rotor core 402 and both sides are short-circuited by a short-circuiting ring may be used. In addition, a wound rotor in which windings are mounted in slots formed in the rotor core 402 may also be used.

< Structure of stator >

Fig. 2 is a perspective view of stator 300 of rotating electric machine 100 according to embodiment 1. Fig. 3 is a perspective view of a coil 310 of a stator 300 of the rotating electric machine 100 according to embodiment 1. The terminal block 320 is provided with three pieces corresponding to three phases, and is connected to the coils 310 of the respective phases. The terminals 340 are provided at three places corresponding to the connections to the three wiring boards 320. Here, the case of three phases is exemplified, but a two-phase rotating electrical machine or a four-phase or more rotating electrical machine may be used.

The stator 300 is configured in a ring shape such that the coils 310 are arranged at equal intervals. The coil 310 includes: pole teeth 331 that divide the stator core 330 in the circumferential direction; and a winding 312 wound around the teeth 331. Each coil 310 includes a yoke portion 332, and the yoke portion 332 connects teeth 331 and teeth 331 arranged radially at equal intervals in the circumferential direction on the outer diameter side.

For the stator core 330 configured by overlapping a plurality of steel plates, the upper side of the stator core 330 is covered with the insulator 311 made of an insulating material, and the lower side of the stator core 330 is covered with the lower insulator 319 made of an insulating material. The winding 312, which is a conductor wire with an insulating coating, is wound around the insulator 311 and the lower insulator 319. Copper wire, aluminum wire, or other conductors may also be used for windings 312.

The stator core 330 is divided into the same number of pole teeth 331 in the circumferential direction by the yoke portion 332. In embodiment 1, an example is shown in which a stator core divided in the circumferential direction is used. However, it is also possible to use a stator core in which all the stator cores 330 are connected by the yoke portion 332 to constitute an integral stator core. Further, a stator core portion that is connected to the yoke portion 332 by a thin wall and can be linearly expanded may be used.

For each pole tooth 331, a sheet-like slot insulator (slot cell)313 made of an insulating material such as polyphenylene sulfide resin or meta-aramid fiber is brought into contact with each pole tooth 330 to electrically isolate the winding 312 from the stator core 330, and the upper and lower ends of the stator core 330 are fixed while being covered with the insulator 311 and the lower insulator 319. The slot insulator 313 may be fixed by attaching a double-sided tape to the side surface of the stator core 330.

< insulating Member >

Fig. 4 is a perspective view of the insulator 311 of the stator 300 of the rotating electric machine 100 according to embodiment 1. Fig. 5 is a plan view of the insulator 311 of the stator 300 of the rotating electric machine 100 according to embodiment 1.

The insulating member 311 includes: a body 315 around which the winding 312 is wound; and a wall portion 316 for arranging the winding 312 at a predetermined position. The holder portion 317 is provided on the yoke portion 332 side of the wall portion 316, and the holder portion 317 has a comb-teeth-shaped groove portion 318 in which the connection board 320 is disposed.

The bottom of the groove 318 of the holder 317, which holds the wiring board 320, is a concave portion that accommodates the adhesive. In embodiment 1, an example in which the holder portion 317 is disposed on the yoke portion 332 side of the insulator 311 is shown, but may be disposed on the rotor 400 side.

< Wiring Board >

Fig. 6 is a perspective view of a terminal plate 320 of a stator 300 of a rotating electric machine 100 according to embodiment 1. Fig. 7 is an enlarged view of terminal plate 320 of stator 300 of rotating electric machine 100 according to embodiment 1. Fig. 7 is an enlarged view of a portion a of fig. 6.

The wiring board 320 can be manufactured by punching and processing a strip-shaped conductive member (guide) by pressing. The wiring board 320 is in the shape of a ring with a part of a strip-shaped conductive member open-looped in a state held by the holder portion 317 of the insulating material 311. In the terminal block 320, a coil connection portion 321 and a power supply portion 322 are provided on the upper side of fig. 6 and 7 with respect to a main body portion formed by annularly molding a strip-shaped conductive member. The coil connection portion 321 and the power supply portion 322 are protruding portions that are drawn out to one side (upper side in fig. 6 and 7) of the main body of the terminal plate 320 in the axial direction of the stator 300.

The coil connection portion 321 is a portion where the terminal plate 320 engages with the winding 312 and supplies current to the winding 312. In fig. 6, the wiring board 320 is provided with twelve coil connecting portions 321.

The power supply portion 322 is a portion that supplies power to the wiring board 320. As shown in fig. 7, the pair of protruding portions of the power supply portion 322 are provided adjacent to each other, and a concave shape is formed between the pair of protruding portions. The tip portions of the pair of projections are chamfered so as to facilitate insertion into an opening 341 provided in the terminal 340 described later or sandwiching of a terminal block connection portion 342 provided between the openings 341.

In the wiring board 320, a fixing portion 323 coupled to the insulating member 311 is provided on the lower side in fig. 6 and 7. The fixing portion 323 is a protruding portion that is drawn out to the other side (lower side in fig. 6 and 7) of the main body of the terminal plate 320 in the axial direction of the stator 300.

< assembling of stator >

Fig. 8 is a first assembly diagram of stator 300 of rotating electric machine 100 according to embodiment 1. Thirty-six coils 310, in which an insulator 311, a lower insulator, and the like are assembled and a winding 312 is wound, are arranged in an annular shape in the stator core 330.

Fig. 9 is a second assembly diagram of stator 300 of rotating electric machine 100 according to embodiment 1. The coils 310 arranged in an annular shape are press-fitted into the frame 220 to be integrated. Here, the stator cores 330 at the time of integration may be integrated with each other by welding, bonding, or the like.

Fig. 10 is a first cross-sectional view of an insulator 311 of a stator 300 of a rotating electric machine 100 according to embodiment 1. Fig. 10 is a cross-sectional view of the insulator 311 assembled to the coil 310 along a plane along the axial center of the rotating shaft 401 of the rotating electric machine 100.

After the coil 310 is press-fitted into the frame 220 and integrated, the wiring board 320 is prepared to be fixed to the insulator 311. The bottom of the groove 318 of the insulator 311 holding the wiring board 320 is a concave portion for accommodating the adhesive. Fig. 10 shows a case where the adhesive 500 is injected using the nozzle 600. An adhesive level 501 of injected adhesive 500 is shown.

Fig. 11 is a third assembly diagram of stator 300 of rotating electric machine 100 according to embodiment 1. After the adhesive is injected to the bottom of the groove portion 318 of the insulator 311, the wiring board 320 is formed into an annular shape and the fixing portion 323 is inserted into the groove portion 318.

Fig. 12 is a second cross-sectional view of the insulator 311 of the stator 300 of the rotating electric machine 100 according to embodiment 1. Fig. 12 is a sectional view taken along the face of the wiring board 320 facing the insulating member 311 assembled to the coil 310. The groove 318 of the insulator 311, the fixing part 323 of the wiring board 320, and the adhesive surface 501 are shown in this state.

The adhesive is cured in a state where the fixing portion 323 of the wiring board 320 enters the injection region of the adhesive 500. As a result, fixing portion 323 of wiring board 320 is fixed by the cured adhesive in the recess of the bottom of groove 318, and insulating material 311 is integrated with wiring board 320.

< terminal >

Fig. 13 is a perspective view of terminal 340 of stator 300 of rotating electric machine 100 according to embodiment 1. The terminal 340 is configured to be bent in the following manner: a surface extending in the axial direction of the cylindrical frame 220 (the axial direction of the stator) as the power supply side extends toward the inside in the radial direction of the stator as a connection portion to the terminal plate 320. In other words, the terminal has a plate-like end portion 344 that protrudes outward in the radial direction of the stator from an opening portion 341 coupled to the terminal plate 320 and then extends toward the other side in the axial direction.

A slit-shaped opening 341 is provided at a connection portion of the terminal 340 to the wiring board 320. The opening 341 is provided so that the power supply portion 322 of the wiring board 320 described above is inserted into the opening to fit the opening 341 and the power supply portion 322.

In embodiment 1, the power supply portion 322 of the wiring board 320 has a structure in which a pair of protruding portions are disposed adjacent to each other. The opening portions 341 of the terminals 340 are provided in a pair in a slit shape from both side end portions in the width direction of the terminals 340. A terminal plate connection portion 342 is provided between the pair of openings 341, and the terminal plate connection portion 342 is a portion where the width of the terminal 340 is narrowed and extends to protrude in the radial direction of the stator.

The opening 341 extends in the longitudinal direction along the circumferential direction of the stator. The width between the pair of openings 341 of the terminal 340, that is, the width of the terminal block connecting portion 342 and the distance between the pair of protruding portions of the power supply portion 322 are designed to be equal to or less than (intermediate fitting or close fitting) so that the openings 341 of the terminal 340 and the power supply portion 322 can be fitted to each other, and the width of each opening 341 in the short side direction and the thickness (plate thickness) of the power supply portion 322 may be designed to be equal to or less than (intermediate fitting or close fitting). In this manner, by inserting power supply portion 322 of terminal plate 320 into the opening, opening 341 and power supply portion 322 are firmly fixed, and a highly reliable electrical connection and thermal conductivity can be maintained without a step such as soldering or bonding. This can reduce assembly cost and improve electrical conductivity and thermal conductivity.

The plate-like end 344 of the terminal 340 protrudes toward the other side (lower side in fig. 13) in the axial direction of the stator. The plate-shaped end 344 is flush with the power supply-side connection 343 or is located radially inward of the stator from the flush surface.

Further, as the material of the terminal 340, a metal plate is often selected. This is because the function as a conductor for electrical connection is excellent. Further, the terminals 340 have a function of transferring heat generated by the wiring board 320 or the like to the heat dissipation portion. Further, if the resistance value of the terminal 340 is high, heat generation from the terminal 340 itself becomes large. In view of the above, a metal plate is often selected as the terminal 340, and a metal material having high electrical and thermal conductivity is particularly desirable.

Specifically, the terminal 340 is preferably made of a material having a high purity, such as silver, copper, gold, aluminum, nickel, or platinum. However, in view of cost, copper is used for the terminal 340. Stainless steel can be used from the viewpoint of cost and strength, but the above-exemplified metal materials are suitable in terms of both electrical conductivity and thermal conductivity. When stainless steel is used, it is preferable that the stainless steel is plated with at least copper, that is, has a copper-plated portion provided on the surface.

< plate part >

Fig. 14 is a perspective view of plate portion 350 of stator 300 of rotating electric machine 100 according to embodiment 1. The plate portion 350 is provided with a recess 351 at one end side to be connected with the plate-like end portion 344 of the terminal 340.

Further, an arc surface corresponding to the outer peripheral surface of the frame 220 is provided on the other end side opposite to the one end side on which the recess 351 is provided so as to be attached to the outer periphery of the frame 220 which is the cylindrical portion of the housing 210. By providing plate portion 350, even when the outer diameter of case 210 of rotating electric machine 100 changes due to a change in the model or specification of rotating electric machine 100, the need to replace other components such as terminal 340 can be eliminated by appropriately adjusting the shape of plate portion 350.

Fig. 15 is a first assembly diagram of the terminal 340 and the plate portion 350 of the rotary electric machine 100 of embodiment 1. Fig. 16 is a second assembled view of the above-described terminal 340 and plate portion 350.

As shown in fig. 15, the plate portion 350 abuts with an arc surface on the outer peripheral side of the cylindrical portion of the frame 220, and is connected by welding, for example. The connection can also be made by pressing, screwing or the like, instead of by welding. Further, the plate portion 350 may be integrally formed outside the cylindrical portion of the frame 220 by casting or forging.

As a material of the plate portion 350, a metal plate is preferable in terms of thermal conductivity and mounting ability by soldering, and a metal material similar to the terminal 340 exemplified above is preferable. On the other hand, unlike the terminal 340, electrical conductivity is not particularly required, and therefore, it may be made of an insulating material having high thermal conductivity. In this case, the plate portion 350 and the frame 220 may be fixed by bonding or welding.

The concave portion 351 of the plate portion 350 and the plate-like end portion 344 of the terminal 340 are connected via an insulator 360. The insulator 360 is provided in an コ -letter shape at a cross section perpendicular to the axial direction of the stator corresponding to the shape of the gap between the recess 351 of the plate portion 350 and the plate-like end portion 344 of the terminal 340. By providing the recessed portion 351 of the plate portion 350 and the plate-like end portion 344 of the terminal 340 in the above-described manner, the shape of the insulator 360 can be simplified and shared. As a material of the insulator 360, in order to maintain high thermal conductivity while ensuring insulation, a silicone resin, a resin containing a high thermal conductivity filler, an insulating varnish, a rubber material, or the like can be used. Heat resistance and insulation properties can be ensured, and reliability can be improved.

< Heat dissipation Structure >

Fig. 17 is a sectional view showing connection between the terminal 340 and the frame 220 of the rotating electric machine 100 according to embodiment 1. Fig. 17 is a sectional view taken along the rotation shaft 401 of the rotating electric machine 100. In particular, a heat radiation effect due to the connection of the terminal 340 in embodiment 1 will be described.

In order to operate the rotating electric machine 100, a drive current is supplied from the outside of the rotating electric machine to the power supply side connection portion 343 of the terminal 340. The current supplied to the power supply side connection portion 343 of the terminal 340 is transmitted to the power supply portion 322 of the terminal board 320 via the terminal board connection portion 342. The coil 310 is distributed with current from the coil connecting portion 321 of the wiring board 320.

By energizing the terminal plate 320 provided for each phase, a current flows in the coil 310 for each phase, and as a result, heat generation occurs in the terminal plate 320 and the terminal 340. In particular, in the case of the rotating electric machine 100 with higher output, the heat generation generated in the above configuration is increased.

In the terminal 340 of embodiment 1, heat generated by the terminal board 320 is transmitted to the opening 341, which is a connection portion of the terminal 340 to the terminal board 320, and the terminal board connection portion 342. Then, the plate-like end 344 transferred to the terminal 340 is further transferred from the plate-like end 344 to the cylindrical portion of the housing 210, that is, the outer peripheral side of the frame 220, via the insulator 360 and the plate portion 350 in this order.

Heat generated from the terminal 340 itself is also transferred from the plate-like end 344 to the outer peripheral side of the frame 220 via the insulator 360 and the plate portion 350 in this order.

That is, heat from the wiring board 320 or the terminal 340 is guided to the frame 220.

The inner side of the frame 220 is filled with heat generated by the coil 310 and the stator core 330 to have a high temperature, and the outer peripheral side of the frame 220 has a lower temperature than the inner side. Thus, heat is transferred from the plate-like end 344 of the terminal 340 to the outer peripheral side of the frame 220, whereby more efficient cooling can be achieved.

Insulator 360 is selected to be a material that provides both insulation and high thermal conductivity. The material having high thermal conductivity is also selected for the plate portion 350. Thereby, with respect to heat conduction via the insulator 360 and the plate portion 350, heat from the wiring board 320 or the terminal 340 can be efficiently transferred to the frame 220 as a heat dissipation portion.

The terminal 340, which is a basic structure of the conventional power supply unit, extends toward the other side in the axial direction without particularly changing the thickness of the terminal 340, and is used as a connection unit for heat dissipation. The insulator 360 and the plate portion 350 are configured to be accommodated in a region of a gap between the terminal 340 and the frame 220. This makes it possible to provide the cooling structure without particularly increasing the amount of excess to the outside in the radial direction of the stator 300.

In particular, the plate portion 350 has an outer shape provided with a concave portion 351 connected to the plate-like end portion 344 of the terminal 340 and an arc surface attached to the outer periphery of the frame 220. This effectively prevents positional displacement between the members, vibration noise, member deterioration due to vibration, and the like, and contributes to space saving while ensuring thermal conductivity. By providing the plate-like end portion 344 of the terminal 340 in a plate-like shape having a uniform thickness, the heat conduction performance can be stabilized, and the shape can be unified and standardized regardless of the model change and the specification change of the rotating electric machine 100, and parts can be replaced.

Further, by appropriately adjusting the shape of the plate portion 350 as described above, a heat conduction structure from the terminal 340 to the frame 220 can be configured without changing conventional components such as the terminal 340 and the frame 220.

As described above, in the rotating electrical machine 100 according to embodiment 1, the plate-like end portion 344 of the connection terminal 340 is configured as a power supply portion as follows: and is in contact with the outer circumferential surface of the frame 220 via an insulator, so that heat from the terminal 340 or the wiring board 320 is conducted to the frame 220. This can improve the heat dissipation of the terminal 340 or the terminal block 320 without increasing the allowable space in the radial structure of the stator 300.

In fig. 17, heat dissipation from the terminal 340 to the cylindrical portion of the frame 220 is explained. However, the heat dissipation from the terminals 340 may also dissipate heat toward the end plates 212 constituting the housing 210. Heat can be transferred to the case 210 from the terminal 340, to which heat of the wiring board 320 is transferred, in a shorter distance, and therefore, a higher heat dissipation effect can be expected.

The inside of the case 210 is filled with heat generated by the coil 310 and the stator core 330 to have a high temperature, and the outside of the case 210 has a lower temperature than the inside. This allows more efficient cooling by heat transfer from the plate-like end 344 of the terminal 340 to the outside of the housing 210. This enables efficient heat dissipation even when heat is transferred to the outside of the end plate 212.

2. Embodiment mode 2

Fig. 18 is a first sectional view of a rotating electric machine 100a according to embodiment 2. Fig. 18 is a sectional view taken along the rotation shaft 401 of the rotating electric machine 100 a. Fig. 19 is a second sectional view of a rotary electric machine 100b according to embodiment 2.

< refrigerant flow path >

The case 210a of fig. 18 is composed of an end plate 212 and a frame 220 a. The frame 220a includes an end plate connection portion 221a, a cylindrical portion 222a, and a sleeve portion 223 a.

The cylindrical portion of the frame 220a is provided with a refrigerant flow passage 215. A sleeve portion 223a is provided on the outer peripheral side of the cylindrical portion 222a of the frame 220a, and a portion surrounded by the cylindrical portion 222a and the sleeve portion 223a constitutes the refrigerant flow path 215. The refrigerant flow path 215 allows the refrigerant to flow, and can suppress a temperature rise of the rotating electric machine 100 a.

Fig. 18 shows an example in which the sleeve portion 223a is provided as a member different from the cylindrical portion 222 a. The sleeve portion 223a and the cylindrical portion 222a can be assembled by welding. The sleeve portion 223a may be formed integrally with the cylindrical portion 222a by casting, forging, or the like.

Fig. 19 illustrates a case where the sleeve portion 223b and the cylindrical portion 222b are integrally formed in the rotating electric machine 100b according to embodiment 2. End plate connection portions 221b are joined by welding or the like from the rear to constitute refrigerant flow channel 215.

The heat transferred from the terminals 340 is transferred to the outer peripheral sides of the

sleeve portions

223a, 223b in the

frames

220a, 220b functioning as heat dissipation portions via the insulators 360, the plate portions 350. The

sleeve portions

223a and 223b are provided therein with a passage through which the refrigerant flows. The heat transferred to the

jacket portions

223a and 223b is carried through the refrigerant, and is efficiently dissipated. This can further improve the heat dissipation of the terminal 340 and the terminal plate 320 without increasing the allowable space in the radial structure of the stator 300.

The plate-like end 344 of the terminal 340 is disposed on the outer peripheral side of the

sheath portions

223a, 223b, which are the radially outer sides of the refrigerant flow paths 215 of the

frames

220a, 220b, via an insulator. The inside of the

cases

210a and 210b is filled with heat generated by the coil 310 and the stator core 330 and has a high temperature, and the outside of the

cases

210a and 210b is cooled by the refrigerant in the refrigerant passage 215 and has a lower temperature than the inside. This allows more efficient cooling by heat transfer from the plate-like end 344 of the terminal 340 to the outside of the housing 210.

Plate portion 350 abuts with the outer peripheral sides of

sleeve portions

223a, 223b of

frames

220a, 220b by an arc surface, and is connected by welding, for example. The connection can also be made by pressing, screwing or the like, instead of by welding. Further, the plate portion 350 may be integrally formed outside the

sleeve portions

223a and 223b of the

frames

220a and 220b by casting or forging.

The material of plate portion 350 is preferably a metal plate material in view of thermal conductivity and ability to be attached by welding. However, unlike the terminal 340, electrical conductivity is not particularly required, and therefore, it may be made of an insulating material having high thermal conductivity. In this case, the plate portion 350 and the

sleeve portions

223a, 223b may be fixed by bonding or welding. By fixing by adhesion or welding, improvement in productivity while ensuring reliability can be expected.

3. Embodiment 3

Fig. 20 is a sectional view (reference numeral 100c is not shown) showing connection between the terminal 340 and the frame 220a of the rotating electric machine 100c according to embodiment 3. Fig. 20 is a cross-sectional view of the rotating electric machine 100c taken along a plane along the axial center of the rotating shaft 401.

The connection method between the rotating electric machine 100c and the power supply unit thereof according to embodiment 3 and the method of dissipating heat from the terminal 340 to the sleeve 223a are the same as those described with reference to fig. 18 according to embodiment 2. In embodiment 3, a feature is a structure in which the insulator 360 is replaced with a different member, i.e., the insulator 311 a.

Instead of the insulator 360 of embodiment 2, the insulator 311 is extended in the axial direction of the stator, and is changed to an abutting portion where the terminal 340 abuts on the outer periphery of the frame 220. More specifically, the above change is made for the insulating member 311a including the holder portion 317 holding the wiring board 320, corresponding to the arrangement position of the terminals 340.

As shown in fig. 20, the insulator 311a extends from the holder 317 shown in fig. 4 and 5 to the outer periphery of the frame 220a in the outer diameter direction, and further extends toward the other axial side (lower side in fig. 20) of the stator along the gap between the outer peripheral surface of the frame 220a and the terminal 340. The insulator 311a is partially disposed between the plate portion 350 attached to the outer peripheral surface of the frame 220a and the plate-like end portion 344 of the terminal 340.

A part of the insulator 311a functions to maintain insulation between the terminal 340 and the outer peripheral surface of the frame 220a, similarly to the insulator 360 of embodiment 2. Further, the function of transferring heat from the terminal 340 to the pocket portion 223a of the frame 220a is maintained.

In addition, as shown in fig. 20, the portion of the insulator 311a extending in the axial direction of the stator on the outer peripheral side of the frame 220a can be increased. Accordingly, the insulating member 311a can be provided in contact with the plate portion 350, in addition to the portion located between the plate portion 350 and the plate-like end portion 344 of the terminal 340.

As described above, in the rotating electric machine 100c according to the third embodiment, the plate-like end 344 of the terminal 340 is in contact with the outer peripheral side of the frame 220a via the insulating member 311 functioning as an insulator, and heat from the terminal 340 or the terminal block 320 is guided to the frame 220 a. This configuration has the same basic configuration as the power supply unit of embodiment 2, and therefore, the same effects as those of embodiment 2 can be obtained.

On the other hand, in the rotating electric machine 100c according to embodiment 3, the insulator 311a is extended outward in the radial direction of the stator instead of the insulator 360 according to embodiment 2. Further, the structure is changed to extend to the other axial side of the stator after extending radially outward, and to extend to an abutting portion where the terminal 340 abuts against the outer peripheral side of the frame 220 a.

Therefore, it is not necessary to provide an additional insulator 360, and assembly and the like can be performed without connecting plate portion 350 and terminal 340 in advance, and the number of parts can be reduced and manufacturing cost can be reduced in addition to the same effects as in embodiment 2 described above.

In addition, in the rotating electric machine 100c according to embodiment 3, not only the plate-shaped end 344 of the terminal 340 in fig. 11 but also the contact area between the terminal 340 and the insulator 311a can be increased on the inner side in the stator radial direction of the power supply side connecting portion 343, and heat dissipation can be improved.

4. Embodiment 4

Fig. 21 is a sectional view (reference numeral 100d is not shown) showing connection between the terminal 340a and the frame 220a of the rotating electric machine 100d according to embodiment 4. Fig. 21 is a cross-sectional view of the rotating electric machine 100d taken along a plane along the axial center of the rotating shaft 401.

The connection method between the rotating electric machine 100d and the power supply unit thereof and the method of dissipating heat from the terminal 340a to the sleeve 223a in embodiment 4 are the same as those in embodiment 2 described with reference to fig. 18. In embodiment 4, the plate-like end portion 344a of the terminal 340a is bent radially inward of the stator 300 and is directly connected to the sleeve portion 223a via the insulator 360 a. The plate-like end 344a of the terminal may be formed as a circular arc surface having a cylindrical shape along the outer peripheral surface of the sleeve portion 223a of the frame 220 a.

A change from embodiment 2 will be described while comparing with fig. 18 of embodiment 2. In embodiment 4, as shown in fig. 21, instead of the plate portion 350 and the insulator 360 in embodiment 2, a structure is formed in which the plate portion 350 is omitted and the terminal 340a is abutted with the sleeve portion 223a only via the insulator 360 a.

As particularly shown, the plate-like end portion 344a provided with the terminal 340a is a bent portion bent toward the side close to the sleeve portion 223 a. Further, the insulator 360a is sandwiched between the plate-like end 344a and the surface of the cover 223 a.

The terminal 340a is attached so as to abut against the sleeve portion 223a via an insulator 360 a. Therefore, the plate-shaped end 344a of the terminal 340a is mounted close to the cover 223a in a state where the insulator 360a is disposed on the surface of the cover 223 a. The insulator 360a is sandwiched between the sleeve 223a and the stator 300 by being pressed and bent from the radial outside, and thus the stator can be easily mounted.

In addition, as for the insulator 360a, a resin member molded in advance in the following manner may be provided: similarly to the outer shape of the plate portion 350 of embodiment 2, a concave portion or an arc surface corresponding to the outer periphery of the plate-shaped end portion 344a or the sleeve portion 223a is provided. However, if the plate-shaped end 344a is pressed and bent to sandwich the insulator 360a as described above, the insulator may be provided in a sheet shape along the outer periphery of the sleeve portion 223 a. In addition, a resin material having high flexibility can be used, and a member having a simple outer shape, such as a simple rectangular block, can be used. Even in this case, the shape can be appropriately changed to the shape corresponding to the outer peripheries of the plate-like end portion 344a and the sleeve portion 223a, and the respective members can be fixed in a desired positional relationship.

As described above, in the rotating electric machine according to embodiment 4, as the power supply portion, the plate-like end portion 344a of the terminal 340a can be brought into contact with the outer peripheral surface of the frame 220a via the insulator. Includes the same basic structure as the power supply portion of embodiment 2 that guides heat from the terminal 340a or the wiring board 320 to the frame 220 a. Therefore, as in embodiment 2, the heat radiation performance of the terminal 340a or the terminal plate 320 can be improved without enlarging the allowable space in the radial structure of the stator 300.

On the other hand, according to the structure of the power supply unit of embodiment 4, by bending the plate-like end portion 344a of the terminal 340a, the plate-like end portion 344a can be pressed and bent from the radial outside of the stator to be connected to the frame 220a in a state where the insulator 360a is in contact with the cover portion 223a or the frame 220 a. Thus, unlike embodiment 2, it is not necessary to provide plate portion 350 separately from insulator 360a, and the same effects as those of embodiment 2 can be obtained, and the number of parts can be reduced, and the manufacturing cost can be reduced.

In the case where the sleeve portion 223a or the connection portion of the frame 220a is located on the outer side in the stator radial direction than the insulator 311, the plate-like end portion 344a of the terminal 340a can be assembled by bending it first. Therefore, the number of man-hours for bending the plate-shaped end portion 344a can be reduced.

In embodiments 2 to 4, the structures in which the

sleeves

223a and 223b are provided on the outer peripheries of the

frames

220a and 220b, and the

terminals

340 and 340a are brought into contact with the outer peripheral surfaces of the

sleeves

223a and 223b to radiate heat from the

terminals

340 and 340a and the wiring board 320 to the

sleeves

223a and 223b of the

frames

220a and 220b, in particular, have been described.

The above is an example, and a rotating electric machine as in embodiment 1 may be configured without the

sleeve portions

223a and 223 b. In this case, the plate-

like end portions

344 and 344a of the

terminals

340 and 340a are formed so as to be in contact with the outer peripheral surface of the frame 220 via the

insulators

360 and 360a or the insulator 311a and the plate portion 350 as needed, and heat from the

terminals

340 and 340a and the wiring board 320 is released to the outside air via the frame 220.

While various exemplary embodiments and examples have been described in the present application, various features, modes, and functions described in one or more embodiments are not limited to the application to specific embodiments, and can be applied to the embodiments alone or in various combinations. Therefore, numerous modifications not illustrated are contemplated within the technical scope disclosed in the present specification. For example, the case where at least one component is modified, added, or omitted is included, and the case where at least one component is extracted and combined with the components of the other embodiments is also included.

Claims

1. A rotating electrical machine comprising:

a stator in which coils are arranged in an annular shape;

a bottomed cylindrical housing that surrounds the stator;

and a terminal electrically connected to the wiring board and disposed outside the housing via an insulator.

2. The rotating electric machine according to claim 1,

the terminal has an end portion extending outward in a radial direction of the stator and disposed on an outer peripheral side of the cylindrical portion of the housing via the insulator.

3. The rotating electric machine according to claim 2,

the terminal has the end portion that extends radially outward of the stator and extends axially to the other side, and is disposed on the outer peripheral side of the cylindrical portion of the housing via the insulator.

4. A rotating electric machine according to claim 2 or 3,

includes an insulating member that fixes the terminal plate to the stator,

the insulator extends outward in the radial direction of the stator and is disposed on the outer peripheral side of the cylindrical portion of the housing so as to also serve as the insulator.

5. The rotating electric machine according to any one of claims 2 to 4,

the end portion of the terminal is a plate-shaped member having a uniform thickness.

6. The rotating electric machine according to any one of claims 2 to 5,

the cylindrical portion of the housing has a plate portion, one end of which is joined to an outer peripheral surface of the cylindrical portion of the housing, and the other end of which is connected to the end portion of the terminal via the insulator.

7. The rotating electric machine according to claim 6,

the plate portion has: an arc surface coupled to an outer circumferential surface of the cylindrical portion of the housing; and a recess connected to the end of the terminal via the insulator.

8. The rotating electric machine according to claim 7,

the plate portion is welded to an outer peripheral surface of the cylindrical portion of the housing.

9. The rotating electric machine according to any one of claims 2 to 5,

the front end of the terminal has an arc surface, and the arc surface is disposed on the outer peripheral surface of the cylindrical portion of the housing via the insulator.

10. The rotating electric machine according to any one of claims 1 to 9,

the casing is provided with a refrigerant flow path inside.

11. The rotating electric machine according to claim 10,

the housing is provided with the refrigerant flow path inside the cylindrical portion,

the terminal has an end portion disposed on an outer peripheral side of a radially outer side portion of the refrigerant flow path of the housing via the insulator.

12. The rotating electric machine according to any one of claims 1 to 11,

the insulator is made of insulating varnish, insulating resin or rubber material.