Rotating electric machines

Abstract

A rotating electric machine, in which heat dissipation of the terminal block and terminal of the stator coil has not been considered in the past. If the terminal block and the terminal are in a continuously overheated state, it may cause functional degradation and shortened life. The rotating electric machine of the present application includes: a stator, in which the coil is arranged in a circular ring; a bottomed cylindrical shell, the shell surrounds the stator; a circular ring-shaped terminal block, the terminal block is arranged on one side of the axial direction of the stator and is electrically connected to the coil; and a terminal, the terminal is electrically connected to the terminal block and is arranged on the outside of the shell via an insulator.

Description

Technical Field

[0001] The present application relates to a rotating electrical machine. Background Art

[0002] Rotating electric machines are expected to be small and lightweight. In order to simplify the electrical connection of the coils of the stator (stator) that is arranged in a manner to surround the outer circumference of the rotor (rotating body) and to achieve miniaturization and lightness, a technology for providing an annular terminal block is disclosed. With respect to the multi-phase coils wound on the stator core (stator iron core), an annular terminal block is provided corresponding to the number of phases of the coils, and the terminal block is provided on one axial side end face of the stator core throughout the entire circumference, and current is supplied to the coils for each phase via the terminal block. The electrodes of the coils are connected to the terminal block at a short distance for each phase, and current for each phase can be supplied to the terminal block. With such a structure, the connection of the electrodes of the coils can be achieved simply and compactly. (For example, refer to Patent Documents 1 and 2).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2009-247059

[0006] Patent Document 2: Japanese Patent Application Publication No. 2006-158199 Summary of the invention

[0007] Technical problem to be solved by the invention

[0008] In the rotating electric machines described in Patent Documents 1 and 2, there are provided wiring boards provided for each phase for distributing power to the coils of each phase, and terminals for supplying current to each wiring board. However, heat dissipation of the wiring boards and terminals is not considered. If the wiring boards and terminals for supplying power to the coils of each phase through which a large current flows continue to be overheated, it may cause functional deterioration and shortened life. Therefore, it is desired to improve the heat dissipation of the wiring boards and terminals in order to improve the output of the rotating electric machine.

[0009] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a rotating electrical machine capable of improving the heat dissipation of a power supply unit and achieving high output.

[0010] Technical solutions adopted to solve technical problems

[0011] The rotating electrical machine of the present application comprises:

[0012] A stator, wherein the coils are arranged in a circular ring shape;

[0013] A bottomed cylindrical housing, the housing surrounding the stator;

[0014] a ring-shaped terminal block, which is disposed on one side of the stator in the axial direction and is electrically connected to the coil; and

[0015] The terminal is electrically connected to the terminal board and is arranged outside the housing via an insulator.

[0016] Effects of the Invention

[0017] According to the rotary electric machine of the present application, the terminal electrically connected to the terminal block contacts the outer side of the housing via the insulator, and the heat is conducted from the terminal to the housing, thereby improving the heat dissipation of the terminal or the terminal block. Thus, the overheating of the terminal block and the terminal that supply power to the coils of each phase can be suppressed, and the high output of the rotary electric machine can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the rotating electrical machine according to the first embodiment.

[0019] Figure 2 It is a perspective view of the stator of the rotating electrical machine according to the first embodiment.

[0020] Figure 3 It is a perspective view of a coil of a stator of the rotating electrical machine according to the first embodiment.

[0021] Figure 4 It is a perspective view of an insulator of a stator of the rotating electrical machine according to the first embodiment.

[0022] Figure 5 It is a plan view of an insulator of a stator of the rotating electrical machine according to the first embodiment.

[0023] Figure 6 This is a perspective view of a terminal plate of a stator of the rotating electrical machine according to the first embodiment.

[0024] Figure 7 This is an enlarged view of a terminal plate of a stator of the rotating electrical machine according to the first embodiment.

[0025] Figure 8 This is a first assembly diagram of the stator of the rotating electrical machine according to the first embodiment.

[0026] Fig. 9 This is a second assembly diagram of the stator of the rotating electrical machine according to the first embodiment.

[0027] Fig.10 This is a first cross-sectional view of the insulator of the stator of the rotating electrical machine according to the first embodiment.

[0028] Fig.11 This is a third assembly diagram of the stator of the rotating electrical machine according to the first embodiment.

[0029] Fig.12This is a second cross-sectional view of the insulator of the stator of the rotating electrical machine according to the first embodiment.

[0030] Fig.13 It is a perspective view of a connection terminal of a stator of the rotating electrical machine according to the first embodiment.

[0031] Fig.14 It is a perspective view of a plate portion of a stator of the rotating electrical machine according to the first embodiment.

[0032] Fig.15 This is a first assembly diagram of the terminal and the plate portion of the rotating electrical machine according to the first embodiment.

[0033] Fig.16 This is a second assembly diagram of the terminal and the plate portion of the rotating electrical machine according to the first embodiment.

[0034] Fig.17 It is a cross-sectional view showing the connection between the terminal and the frame of the rotating electrical machine according to the first embodiment.

[0035] Fig.18 It is a first cross-sectional view of the rotating electrical machine according to the second embodiment.

[0036] Fig.19 This is a second cross-sectional view of the rotating electrical machine according to the second embodiment.

[0037] Fig. 20 It is a cross-sectional view showing the connection between the terminal and the frame of the rotating electrical machine according to the third embodiment.

[0038] Fig.21 It is a cross-sectional view showing the connection between the terminal and the frame of the rotating electrical machine according to the fourth embodiment.

[0039] (Explanation of symbols)

[0040] 100, 100a, 100b, 100c, 100d rotating electrical machine; 210, 210a, 210b casing; 215 refrigerant flow path; 220, 220a, 220b frame; 222a, 222b cylindrical portion, 223a, 223b sleeve portion; 300 stator; 310 coil; 311, 311a insulating member; 320 terminal block; 321 coil connection portion; 322 power supply portion; 323 fixing portion; 340, 340a terminal; 342 terminal block connection portion; 343 power supply side connection portion; 344, 344a plate-shaped end portion; 350 plate portion; 351 recessed portion; 360, 360a insulator. DETAILED DESCRIPTION

[0041] Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings.

[0042] 1. Implementation Method 1

[0043] <Structure of rotating electrical machine>

[0044] Figure 1 This is a cross-sectional view of the rotary electric machine 100 of Embodiment 1 cut along the axis of the rotating shaft 401. The rotary electric machine 100 is surrounded by a housing 210, and the housing 210 is composed of a bottomed cylindrical frame 220 and an end plate 212 that closes the opening of the frame 220. The stator 300 is fixed to the cylindrical portion of the frame 220 in an embedded state. The stator 300 is also called a stator. The rotor 400 is rotatably supported by the bottom of the frame 220 and the end plate 212 via the bearing 2. The rotor 400 is also called a rotating body. The rotor 400 is arranged on the inner circumference of the stator 300.

[0045] The stator 300 includes: a plurality of coils 310 that generate magnetic flux; and a terminal block 320 that distributes current to the plurality of coils 310. The stator core 330 that allows the magnetic flux to flow is divided into a plurality of pole teeth 331. A coil 310 is formed by winding a winding 312 around each pole tooth 331. The stator 300 has a coil 310 for each of a plurality of phases, and is powered for each phase from a terminal block 320 provided for each phase. Figure 1 In the example, a rotating electric machine with three-phase coils is illustrated. However, the technology described in this application can also be applied to a rotating electric machine with two phases or a rotating electric machine with four or more phases. The coil 310, the terminal block 320, and the stator core 330 are electrically insulated by an insulator 311.

[0046] The terminal block 320 is disposed on one side of the axial direction of the annular stator 300 (at Figure 1 The terminal 340 is connected to the terminal board 320. The terminal 340 is held at a position in contact with the container of the stator 300, that is, the outer peripheral side of the frame 220. The terminal 340 is provided with a power supply side connection portion 343 (described in Figure 3 , illustration of power supply lines omitted).

[0047] The rotor 400 is a permanent magnet type rotor. A rotating shaft 401 is inserted into a cylindrical rotor core 402 at its axial center. Permanent magnets 403 are embedded in the outer peripheral surface of the rotor core 402. The permanent magnets 403 are arranged at a predetermined pitch in the circumferential direction to form magnetic poles.

[0048] The rotor 400 is not limited to the permanent magnet type rotor described above, and a so-called cage rotor in which an uninsulated rotor conductor is housed in a slot of the rotor core 402 and both sides are short-circuited by a short-circuit ring may be used. In addition, a wound rotor in which a winding is installed in a slot formed in the rotor core 402 may be used.

[0049] <Stator Structure>

[0050] Figure 2 It is a perspective view of the stator 300 of the rotating electrical machine 100 according to the first embodiment. Figure 3 1 is a perspective view of a coil 310 of a stator 300 of a rotating electrical machine 100 according to Embodiment 1. A terminal block 320 is provided with three pieces corresponding to three phases, and is connected to the coil 310 of each phase. Terminals 340 are provided at three locations corresponding to the connection to the three-piece terminal block 320. Here, a three-phase case is exemplified, but a two-phase rotating electrical machine or a rotating electrical machine with four or more phases may also be used.

[0051] The stator 300 is configured in a ring shape in such a manner that the coils 310 are arranged at equal intervals. The coils 310 include: pole teeth 331 that divide the stator core 330 in the circumferential direction; and windings 312 wound around the pole teeth 331. Each coil 310 includes a yoke 332 that connects the pole teeth 331 that are arranged radially at equal intervals in the circumferential direction to the pole teeth 331 on the outer diameter side.

[0052] The stator core 330 formed by stacking a plurality of steel plates has an insulating member 311 made of an insulating material covering the upper side of the stator core 330, and a lower insulating member 319 made of an insulating material covering the lower side of the stator core 330. A winding 312, which is a conductor wire with an insulating coating, is wound around the insulating member 311 and the lower insulating member 319. The winding 312 may also use a copper wire, an aluminum wire, or other conductors.

[0053] The stator core 330 is divided into the same number of pole teeth 331 along the circumferential direction by the yoke 332. In Embodiment 1, an example of using a stator core divided along the circumferential direction is shown. However, a stator core in which all stator cores 330 are connected by the yoke 332 to form an integral body can also be used. In addition, a stator core in which the yoke 332 is connected by a thin wall and can be unfolded into a straight line can also be used.

[0054] For each pole tooth 331, in order to electrically isolate the winding 312 from the stator core 330, a sheet-shaped slot cell 313 made of insulating material such as polyphenylene sulfide resin and meta-aramid fiber is brought into contact with the insulating member 311 and the lower insulating member 319 at the upper and lower ends of the stator core 330 and fixed. The slot insulator 313 can also be fixed by sticking double-sided tape on the side of the stator core 330.

[0055] <Insulation parts>

[0056] Figure 4 It is a perspective view of the insulator 311 of the stator 300 of the rotating electrical machine 100 according to the first embodiment. Figure 5 1 is a plan view of the insulator 311 of the stator 300 of the rotating electrical machine 100 according to the first embodiment.

[0057] The insulator 311 includes a trunk 315 around which the winding 312 is wound and a wall 316 for placing the winding 312 at a predetermined position. A retainer 317 having a comb-shaped groove 318 for placing the terminal block 320 is provided on the yoke 332 side of the wall 316.

[0058] The bottom of the groove 318 of the holder 317 for holding the terminal plate 320 is a recessed portion for receiving the adhesive. In the first embodiment, the holder 317 is arranged on the yoke 332 side of the insulator 311, but it may be arranged on the rotor 400 side.

[0059] <Connection board>

[0060] Figure 6 It is a perspective view of the terminal block 320 of the stator 300 of the rotating electrical machine 100 according to the first embodiment. Figure 7 This is an enlarged view of the terminal block 320 of the stator 300 of the rotating electrical machine 100 according to the first embodiment. Figure 7 Yes Figure 6 An enlarged view of part A.

[0061] The terminal block 320 can be manufactured by punching and processing a strip-shaped conductive member (Japanese: conductive material) by a stamping method. The terminal block 320 is formed into a ring shape in which a portion of the strip-shaped conductive member is opened while being held by the retaining member portion 317 of the insulating member 311. In the terminal block 320, relative to the main body portion formed into a ring shape by forming the strip-shaped conductive member, Figure 6 and Figure 7 The coil connection part 321 and the power supply part 322 are provided on the upper side of the stator 300. The coil connection part 321 and the power supply part 322 are located on the axial side of the stator 300 compared with the main part of the terminal block 320 (in Figure 6 , Figure 7 The middle is the protrusion led out from the upper side).

[0062] The coil connection portion 321 is a portion where the terminal block 320 is connected to the winding 312 and supplies current to the winding 312. Figure 6 In the embodiment, the terminal block 320 is provided with twelve coil connection portions 321 .

[0063] The power supply unit 322 is a part that supplies power to the connection board 320. Figure 7 As shown, a pair of protrusions of the power supply part 322 are arranged adjacent to each other, and a concave shape is formed between the pair of protrusions. The front ends of the pair of protrusions are chamfered, so that it is easy to insert into the opening 341 provided in the terminal 340 described later, or to clamp the terminal block connection part 342 provided between the openings 341.

[0064] In the wiring board 320, Figure 6 and Figure 7 A fixing portion 323 is provided on the lower side of the stator 300 and is connected to the insulating member 311. The fixing portion 323 is located on the other side of the stator 300 in the axial direction compared to the main part of the terminal block 320 (at Figure 6 , Figure 7 The middle is the protrusion led out from the lower side).

[0065] <Assembly of stator>

[0066] Figure 8 This is a first assembly diagram of the stator 300 of the rotating electrical machine 100 according to Embodiment 1. It shows a state in which thirty-six coils 310 assembled with the insulator 311 , the lower insulator, etc. and wound with the winding 312 are arranged in a ring shape in the stator core 330 .

[0067] Fig. 9 This is a second assembly diagram of the stator 300 of the rotating electrical machine 100 according to Embodiment 1. The coils 310 arranged in an annular shape are pressed into the frame 220 and integrated. Here, the stator cores 330 during integration may be integrated by welding, bonding, or the like.

[0068] Fig.10 1 is a first cross-sectional view of the insulator 311 of the stator 300 of the rotating electrical machine 100 according to the first embodiment. Fig.10 The figure is a cross-sectional view of the insulator 311 assembled to the coil 310 cut along a plane along the axis of the rotating shaft 401 of the rotating electrical machine 100 .

[0069] After the coil 310 is pressed into the frame 220 and integrated, the terminal plate 320 is prepared to be fixed to the insulating member 311. The bottom of the groove 318 of the insulating member 311 that holds the terminal plate 320 is a concave portion that accommodates the adhesive. Fig.10 The state of injecting adhesive 500 using nozzle 600 is shown. Adhesive liquid level 501 of injected adhesive 500 is shown.

[0070] Fig.11 This is a third assembly diagram of stator 300 of rotating electrical machine 100 according to Embodiment 1. After adhesive is injected into the bottom of groove 318 of insulator 311 , terminal plate 320 is formed into an annular shape and fixing portion 323 is inserted into groove 318 for assembly.

[0071] Fig.12 This is a second cross-sectional view of the insulator 311 of the stator 300 of the rotating electrical machine 100 according to the first embodiment. Fig.12 This is a cross-sectional view of the insulating member 311 assembled to the coil 310 cut along the surface of the terminal plate 320. The groove 318 of the insulating member 311, the fixing portion 323 of the terminal plate 320, and the adhesive liquid level 501 are shown.

[0072] The adhesive is cured while the fixing portion 323 of the terminal block 320 enters the injection region of the adhesive 500. As a result, the fixing portion 323 of the terminal block 320 is fixed in the concave portion at the bottom of the groove 318 by the cured adhesive, so that the insulating member 311 and the terminal block 320 are integrated.

[0073] <Terminal>

[0074] Fig.13 1 is a perspective view of a terminal 340 of a stator 300 of a rotating electrical machine 100 according to Embodiment 1. The terminal 340 is configured to be bent in such a manner that it extends from a surface extending in the axial direction of a cylindrical frame 220 (the axial direction of the stator) as a power supply side toward the radial inner side of the stator as a connection portion connected to the terminal block 320. In other words, the terminal has a plate-shaped end portion 344 that extends toward the other side in the axial direction after protruding from an opening portion 341 connected to the terminal block 320 toward the radial outer side of the stator.

[0075] The connection portion of the terminal 340 connected to the connection board 320 is provided with a slit-shaped opening 341. The opening 341 is provided so that the power supply part 322 of the connection board 320 described above is inserted into the opening and fits with the opening 341.

[0076] In the first embodiment, the power supply portion 322 of the terminal block 320 is configured such that a pair of protrusions are arranged adjacent to each other. The terminal 340 has a pair of openings 341 formed in a notch shape from both side ends in the width direction of the terminal 340. A terminal block connection portion 342 is provided between the pair of openings 341. The terminal block connection portion 342 is a portion where the width of the terminal 340 is narrowed and protrudes in the radial direction of the stator.

[0077] In addition, the long side direction of the opening 341 is extended along the circumferential direction of the stator. In addition, the width between the pair of openings 341 of the terminal 340, that is, the width of the terminal block connection part 342 and the interval between the pair of protrusions of the power supply part 322 are designed to be equal or less (intermediate fit or tight fit) in such a way that the opening 341 of the terminal 340 and the power supply part 322 can be fitted together. The width of the short side direction of each opening 341 and the thickness (plate thickness) of the power supply part 322 can also be designed to be equal or less (intermediate fit or tight fit). If so, by inserting the power supply part 322 of the terminal block 320 into the opening, the opening 341 and the power supply part 322 are firmly fixed, and the process of welding, bonding, etc. can be omitted to maintain a highly reliable electrical connection and thermal conductivity. As a result, the assembly cost can be reduced and the electrical conductivity and thermal conductivity can be improved.

[0078] The plate-shaped end portion 344 of the terminal 340 faces the other axial side of the stator ( Fig.13 The plate-shaped end portion 344 is in the same plane as the power supply side connection portion 343, or is closer to the radial inner side of the stator than the same plane.

[0079] In addition, as for 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. In addition, the terminal 340 has the function of transferring the heat generated by the terminal board 320 and the like to the heat dissipation part. In addition, if the resistance value of the terminal 340 is high, the heat generated by the terminal 340 itself also becomes large. Based on the above, a metal plate is often selected for the terminal 340, and a metal material with high electrical conductivity and thermal conductivity is particularly desirable.

[0080] Specifically, for the terminal 340, a material with a high purity such as silver, copper, gold, aluminum, nickel, platinum, etc. is ideal. However, considering the cost, a copper material is used for the terminal 340 here. From the perspective of cost and strength, stainless steel can be used, but in terms of both electrical conductivity and thermal conductivity, the metal materials exemplified above are suitable. When stainless steel is used, it is ideal to be at least copper-plated, that is, stainless steel with a copper-plated portion provided on the surface.

[0081] <Slab>

[0082] Fig.14 1 is a perspective view of a plate portion 350 of a stator 300 of a rotating electrical machine 100 according to Embodiment 1. The plate portion 350 is provided with a recessed portion 351 at one end thereof so as to be connected to a plate-shaped end portion 344 of a terminal 340 .

[0083] In addition, an arc surface corresponding to the outer peripheral surface of the frame 220 is provided at the other end side opposite to the one end side provided with the recessed portion 351, so as to be mounted on the cylindrical portion of the housing 210, that is, the outer periphery of the frame 220. By providing the plate portion 350, even if the outer diameter of the housing 210 of the rotating electrical machine 100 changes due to a change in the model or specification of the rotating electrical machine 100, the need to replace other components such as the terminal 340 can be eliminated by appropriately adjusting the shape of the plate portion 350.

[0084] Fig.15 This is a first assembly diagram of the terminal 340 and the plate portion 350 of the rotating electrical machine 100 according to the first embodiment. Fig.16 3 is a second assembly diagram of the terminal 340 and the plate portion 350 .

[0085] like Fig.15As shown, the plate portion 350 is in contact with the outer peripheral side of the cylindrical portion of the frame 220 with an arc surface, for example, by welding. It can also be connected by pressing or threading instead of welding. In addition, the outer side of the cylindrical portion of the frame 220 can also be integrally made into the shape of the plate portion 350 by casting or forging.

[0086] As the material of the plate portion 350, in consideration of thermal conductivity and the ability to be mounted by welding, a metal plate is preferably used, and the same metal material as the terminal 340 illustrated above is preferably used. On the other hand, unlike the terminal 340, electrical conductivity is not particularly required, and therefore, it may be made of an insulating material with high thermal conductivity. In this case, the plate portion 350 and the frame 220 may be fixed by bonding or welding.

[0087] The recessed portion 351 of the plate portion 350 and the plate-shaped end portion 344 of the terminal 340 are connected via the insulator 360. The insulator 360 is provided in a U-shape at a cross section perpendicular to the axial direction of the stator, corresponding to the shape of the gap between the recessed portion 351 of the plate portion 350 and the plate-shaped end portion 344 of the terminal 340. By providing the shapes of the recessed portion 351 of the plate portion 350 and the plate-shaped end portion 344 of the terminal 340 as described above, the shape of the insulator 360 can be simplified and made common. As the material of the insulator 360, in order to ensure insulation and maintain high thermal conductivity, silicone resin, resin with high thermal conductivity filler, insulating varnish, rubber material, etc. can be used. Heat resistance and insulation can be ensured, and reliability can be improved.

[0088] <Heat dissipation structure>

[0089] Fig.17 1 is a cross-sectional view showing the connection between the terminal 340 and the frame 220 of the rotating electrical machine 100 according to the first embodiment. Fig.17 It is a cross-sectional view cut along the rotating shaft 401 of the rotating electrical machine 100. In particular, the heat dissipation effect by the connection of the terminal 340 according to the first embodiment will be described.

[0090] In order to operate the rotating electric machine 100, a driving 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 block 320 via the terminal block connection portion 342. The current is distributed from the coil connection portion 321 of the terminal block 320 to the coil 310.

[0091] When the connection plate 320 provided for each phase is energized, current flows through the coil 310 for each phase, resulting in heat generation in the connection plate 320 and the connection terminal 340. In particular, in the case of a high-output rotating electrical machine 100, the heat generated in the above structure increases.

[0092] In the terminal 340 of the first embodiment, the heat generated by the terminal block 320 is transferred to the opening portion 341 and the terminal block connecting portion 342, which are the connection portions of the terminal 340 connected to the terminal block 320. Then, the heat is transferred to the plate-shaped end portion 344 of the terminal 340, and further transferred from the plate-shaped end portion 344 to the cylindrical portion of the housing 210, that is, the outer peripheral side of the frame 220, through the insulator 360 and the plate portion 350 in sequence.

[0093] The heat generated from the terminal 340 itself is also transferred from the plate-shaped end portion 344 to the outer peripheral side of the frame 220 through the insulator 360 and the plate portion 350 in sequence.

[0094] That is, heat from the terminal block 320 or the terminal 340 is guided to the frame 220 .

[0095] The inner side of the frame 220 is filled with heat generated by the coil 310 and the stator core 330 and becomes a relatively high temperature, while the outer side of the frame 220 is lower in temperature than the inner side. Thus, by transferring heat from the plate-shaped end 344 of the terminal 340 to the outer side of the frame 220, more efficient cooling can be achieved.

[0096] The insulator 360 is selected to be a material that has both insulation and high thermal conductivity. The plate portion 350 is also selected to be a material with high thermal conductivity. Thus, the heat from the terminal block 320 or the terminal 340 can be effectively transferred to the frame 220 as a heat dissipation portion through the heat conduction of the insulator 360 and the plate portion 350.

[0097] In addition, the terminal 340, which is a basic structure of the conventional power supply unit, is extended to the other side in the axial direction without particularly changing the thickness of the terminal 340 to serve as a connection portion for heat dissipation. The insulator 360 and the plate portion 350 are arranged in a manner to be accommodated in the area of ​​the gap between the terminal 340 and the frame 220. Thus, the cooling structure can be provided without particularly increasing the amount of protrusion toward the outer side in the radial direction of the stator 300.

[0098] In particular, the outer shape of the plate portion 350 is provided with a recessed portion 351 connected to the plate-shaped end portion 344 of the terminal 340 and an arc surface mounted on the outer periphery of the frame 220. This effectively prevents positional deviation between components, vibration sound, and component degradation caused by vibration, thereby ensuring thermal conductivity and helping to save space. The plate-shaped end portion 344 of the terminal 340 is set to a plate shape with uniform thickness, thereby stabilizing thermal conductivity, and making the shape uniform and standardized regardless of changes in the model and specification of the rotating electrical machine 100, and making it possible to replace components.

[0099] Furthermore, 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 formed without changing the existing components such as the terminal 340 and the frame 220 .

[0100] As described above, in the rotating electrical machine 100 of the first embodiment, as the structure of the power supply portion thereof, the plate-shaped end portion 344 of the terminal 340 is configured to contact the outer peripheral surface of the frame 220 via an insulator, so that the heat from the terminal 340 or the terminal plate 320 is guided to the frame 220. Thus, the heat dissipation of the terminal 340 or the terminal plate 320 can be improved without increasing the structural allowable space in the radial direction of the stator 300.

[0101] Fig.17 In the above description, heat dissipation from the terminal 340 to the cylindrical portion of the frame 220 is described. However, heat dissipated from the terminal 340 may also be dissipated toward the end plate 212 constituting the housing 210. Since the terminal 340 that transfers heat from the terminal plate 320 can transfer heat to the housing 210 at a shorter distance, a higher heat dissipation effect can be expected.

[0102] The inside of the housing 210 is filled with heat generated by the coil 310 and the stator core 330 and becomes a relatively high temperature, while the outside of the housing 210 is lower in temperature than the inside. Thus, more efficient cooling can be achieved by transferring heat from the plate-shaped end 344 of the terminal 340 to the outside of the housing 210. Thus, even when heat is transferred to the outside of the end plate 212, effective heat dissipation can be implemented.

[0103] 2. Implementation Method 2

[0104] Fig.18 It is a first cross-sectional view of the rotating electrical machine 100 a according to the second embodiment. Fig.18 It is a cross-sectional view taken along the rotation shaft 401 of the rotating electrical machine 100 a . Fig.19 This is a second cross-sectional view of the rotating electrical machine 100 b according to the second embodiment.

[0105] <Refrigerant flow path>

[0106] Fig.18 The housing 210a is composed of an end plate 212 and a frame 220a. The frame 220a is composed of an end plate connecting portion 221a, a cylindrical portion 222a, and a sleeve portion 223a.

[0107] The cylindrical portion of the frame 220a is provided with a refrigerant flow path 215. A sleeve portion 223a is provided on the outer circumferential side of the cylindrical portion 222a of the frame 220a, and the portion surrounded by the cylindrical portion 222a and the sleeve portion 223a constitutes the refrigerant flow path 215. The refrigerant flows through the refrigerant flow path 215, which can suppress the temperature rise of the rotating electrical machine 100a.

[0108] Fig.18 , an example in which the sleeve 223a is provided as a component different from the cylindrical portion 222a is shown. The sleeve 223a and the cylindrical portion 222a can be assembled by welding. In addition, the sleeve 223a and the cylindrical portion 222a can also be formed into one piece by casting, forging, etc.

[0109] Fig.19 The case where the sleeve portion 223b and the cylindrical portion 222b are formed integrally in the rotating electrical machine 100b of Embodiment 2 is exemplified. The end plate connecting portion 221b is connected from the rear by welding or the like to form the refrigerant flow path 215.

[0110] The heat transferred from the terminal 340 is transferred to the outer peripheral side of the sleeve 223a, 223b in the frame 220a, 220b, which functions as a heat dissipation part, via the insulator 360 and the plate 350. The sleeve 223a, 223b has a passage for the refrigerant to flow. The heat transferred to the sleeve 223a, 223b is transported by the refrigerant and dissipated efficiently. As a result, the heat dissipation of the terminal 340 or the terminal plate 320 can be further improved without expanding the radial structural allowable space of the stator 300.

[0111] The plate-shaped end 344 of the terminal 340 is arranged on the outer side of the refrigerant flow path 215 of the frame 220a, 220b in the radial direction, that is, the outer peripheral side of the sleeve 223a, 223b via an insulator. The inner side of the housing 210a, 210b is filled with heat generated by the coil 310 and the stator core 330 and becomes a higher temperature, while the outer side of the housing 210a, 210b is cooled by the refrigerant in the refrigerant flow path 215 and its temperature is lower than that of the inside. Therefore, by transferring heat from the plate-shaped end 344 of the terminal 340 to the outer side of the housing 210, more efficient cooling can be achieved.

[0112] The plate portion 350 is in contact with the outer peripheral side of the sleeve portions 223a and 223b of the frames 220a and 220b by using an arc surface, for example, by welding. It can also be connected by pressing or screwing instead of welding. In addition, the outer side of the sleeve portions 223a and 223b of the frames 220a and 220b can also be integrally manufactured into the shape of the plate portion 350 by casting or forging.

[0113] As the material of the plate portion 350, a metal plate is ideal in terms of thermal conductivity and the ability to be mounted by welding. However, unlike the terminal 340, electrical conductivity is not particularly required, so it can also be made of an insulating material with high thermal conductivity. In this case, the plate portion 350 and the sleeve portions 223a, 223b can be fixed by bonding or welding. By fixing by bonding or welding, it can be expected that reliability can be ensured while improving productivity.

[0114] 3. Implementation Method 3

[0115] Fig. 20 1 is a cross-sectional view showing the connection between the terminal 340 and the frame 220 a of the rotating electrical machine 100 c according to the third embodiment (reference numeral 100 c is not shown). Fig. 20 This is a cross-sectional view of the rotating electrical machine 100 c cut along a plane along the axis of the rotating shaft 401 .

[0116] The connection method of the rotating electrical machine 100c and its power supply unit in the third embodiment and the heat dissipation method from the terminal 340 to the sleeve 223a are different from those in the second embodiment. Fig.18 The third embodiment is characterized in that the insulator 360 is replaced with an insulating member 311 a which is a different member.

[0117] As a substitute for the insulator 360 of the second embodiment, the insulating member 311 is extended in the axial direction of the stator to extend to the contact portion where the terminal 340 contacts the outer periphery of the frame 220. More specifically, the insulating member 311a including the holder portion 317 for holding the terminal block 320 is changed in accordance with the arrangement position of the terminal 340.

[0118] like Fig. 20 As shown, the insulating member 311a is Figure 4 , Figure 5 The holder portion 317 shown in the figure extends to the outer periphery of the frame 220a in the outer diameter direction, and further extends along the gap sandwiched by the outer peripheral surface of the frame 220a and the terminal 340 toward the other axial side of the stator (at Fig. 20 The insulating member 311a is configured such that a portion thereof is disposed between a plate portion 350 attached to the outer peripheral surface of the frame 220a and a plate-shaped end portion 344 of the terminal 340.

[0119] A part of the insulating member 311a plays the role of maintaining insulation between the terminal 340 and the outer peripheral surface of the frame 220a, similarly to the insulator 360 of Embodiment 2. In addition, the insulating member 311a also maintains the function of transferring heat from the terminal 340 to the jacket portion 223a of the frame 220a.

[0120] In addition, if Fig. 20As shown, 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 enlarged. Thus, the insulator 311a can be placed in contact with the plate portion 350 in addition to the portion between the plate portion 350 and the plate-shaped end portion 344 of the terminal 340.

[0121] As described above, in the rotating electric machine 100c of the third embodiment, the plate-shaped 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 the heat from the terminal 340 or the terminal plate 320 is guided to the frame 220a. Thus, the same basic structure as the power supply unit of the second embodiment is provided, and therefore, the same effect as that of the second embodiment can be obtained.

[0122] On the other hand, in the rotating electric machine 100c of the third embodiment, the insulating member 311a is extended outward in the radial direction of the stator instead of the insulator 360 in the second embodiment. Furthermore, after extending outward in the radial direction, the insulating member 311a is extended to the other axial side of the stator to extend to the contact portion where the terminal 340 contacts the outer peripheral side of the frame 220a.

[0123] Therefore, there is no need to separately provide an insulator 360, and assembly is possible even without connecting the plate portion 350 and the terminal 340 in advance. In addition to having the same effects as the second embodiment, the number of components can be reduced, and manufacturing costs can be reduced.

[0124] In the rotating electrical machine 100c of the third embodiment, not only Fig.11 The plate-shaped end portion 344 of the terminal 340 can also increase the contact area between the terminal 340 and the insulating member 311a on the radial inner side of the stator of the power supply side connection portion 343, thereby improving heat dissipation.

[0125] 4. Implementation Method 4

[0126] Fig.21 1 is a cross-sectional view showing the connection between the terminal 340 a and the frame 220 a of the rotating electrical machine 100 d according to the fourth embodiment (reference numeral 100 d is not shown). Fig.21 This is a cross-sectional view of the rotating electrical machine 100 d cut along a plane along the axis of the rotating shaft 401 .

[0127] The connection method of the rotating electrical machine 100d and its power supply unit in the fourth embodiment and the heat dissipation method from the terminal 340a to the sleeve 223a are different from those in the second embodiment. Fig.18The inside and the outline of the description are the same. In the fourth embodiment, the plate-shaped end 344a of the terminal 340a is bent inward in the radial direction of the stator 300 and is directly connected to the sleeve 223a via the insulator 360a. The plate-shaped end 344a of the terminal may be formed into a cylindrical arc surface along the outer peripheral surface of the sleeve 223a of the frame 220a.

[0128] In the same manner as in Implementation 2 Fig.18 While comparing, the changes from Implementation 2 are described. In Implementation 4, Fig.21 As shown, instead of the plate portion 350 and the insulator 360 in the second embodiment, the plate portion 350 is omitted and the terminal 340a is brought into contact with the sleeve portion 223a only via the insulator 360a.

[0129] As particularly shown in the figure, the plate-shaped end 344a of the terminal 340a is provided with a bent portion bent toward the side close to the sleeve 223a. In addition, the insulator 360a is sandwiched between the plate-shaped end 344a and the surface of the sleeve 223a.

[0130] The terminal 340a is mounted in contact with the sleeve 223a via the insulator 360a. Therefore, the plate-shaped end 344a of the terminal 340a is mounted close to the sleeve 223a while the insulator 360a is arranged on the surface of the sleeve 223a. The insulator 360a is pressed and bent from the radially outer side of the stator 300 so as to be sandwiched between the sleeve 223a, thereby making it easier to mount.

[0131] In addition, the insulator 360a can be set as a resin component pre-formed in the following manner: a concave portion or arc surface corresponding to the outer periphery of the plate-shaped end 344a and the sleeve 223a is set in the same manner as the outer shape of the plate portion 350 of the second embodiment. However, if the plate-shaped end 344a is pressed and bent as described above to clamp the insulator 360a, it can also be set as a sheet along the outer periphery of the sleeve 223a. In addition, a resin material with high flexibility can be used, and a component with a simpler outer shape represented by a simple rectangular block can be used. Even so, it can be appropriately changed to a shape corresponding to the outer periphery of the plate-shaped end 344a and the sleeve 223a, and each component can be fixed in a desired positional relationship.

[0132] As described above, in the rotating electric machine of the fourth embodiment, as the structure of the power supply portion thereof, the plate-shaped end portion 344a of the terminal 340a can also be brought into contact with the outer peripheral surface of the frame 220a via an insulator. The same basic structure as the power supply portion of the second embodiment that guides the heat from the terminal 340a or the terminal plate 320 to the frame 220a is included. Therefore, similarly to the second embodiment, the heat dissipation of the terminal 340a or the terminal plate 320 can be improved without increasing the radial structural allowable space of the stator 300.

[0133] On the other hand, according to the structure of the power supply unit of the fourth embodiment, by bending the plate-shaped end portion 344a of the terminal 340a, the plate-shaped end portion 344a can be bent and connected to the frame 220a by pressing the plate-shaped end portion 344a from the radial outside of the stator while the insulator 360a is in contact with the sleeve 223a or the frame 220a. Thus, it is not necessary to provide the plate portion 350 separately from the insulator 360a as in the second embodiment, and in addition to having the same effects as the second embodiment, the number of components can be reduced, and the manufacturing cost can be reduced.

[0134] In addition, when the connection portion of the sleeve 223a or the frame 220a is located radially outside the stator relative to the insulator 311, the plate-shaped end portion 344a of the terminal 340a can be bent before assembly. Therefore, the number of man-hours required to bend the plate-shaped end portion 344a can be reduced.

[0135] In addition, in embodiments 2 to 4, a structure is described in which the outer periphery of the frame 220a, 220b includes a sleeve 223a, 223b and the terminal 340, 340a is in contact with the outer peripheral surface of the sleeve 223a, 223b to dissipate heat from the terminal 340, 340a and the terminal board 320 to the frame 220a, 220b, especially the sleeve 223a, 223b.

[0136] The above is an example, and a rotating electric machine without sleeves 223a and 223b as in Embodiment 1 may be used. In this case, the plate-shaped ends 344 and 344a of the terminals 340 and 340a only need to be formed to contact the outer peripheral surface of the frame 220 via the insulators 360 and 360a or the insulating member 311a and the plate 350 as required, and the heat from the terminals 340 and 340a and the terminal plate 320 is released to the outside air via the frame 220.

[0137] This application records various illustrative embodiments and examples, but the various features, methods and functions recorded in one or more embodiments are not limited to application to specific embodiments, and can be applied to the embodiments alone or in various combinations. Therefore, countless variations that are not exemplified are envisioned within the technical scope disclosed in the specification of this application. For example, it includes the case where at least one constituent element is deformed, added or omitted, and also includes the case where at least one constituent element is extracted and combined with constituent elements of other embodiments.

Claims

1. A rotating electrical machine, comprising: A stator, wherein the coils are arranged in a circular ring shape; A bottomed cylindrical housing, the housing surrounding the stator; a ring-shaped terminal block, the terminal block being arranged on one side of the axial direction of the stator and being electrically connected to the coil; as well as a terminal electrically connected to the terminal block and arranged on the outer side of the housing via an insulator, The terminal has an end portion extending outward in the radial direction of the stator and arranged on the outer circumference side of the cylindrical portion of the housing via the insulator. The cylindrical portion of the housing has a plate portion, one end of the plate portion is coupled to the outer peripheral surface of the cylindrical portion of the housing, and the other end of the plate portion is connected to the end portion of the terminal via the insulator.

2. The rotating electrical machine according to claim 1, characterized in that The terminal has the end portion extending outward in the radial direction of the stator and extending toward the other side in the axial direction and arranged on the outer peripheral side of the cylindrical portion of the housing via the insulator.

3. The rotating electrical machine according to claim 1, characterized in that comprising an insulating member, wherein the insulating member fixes the terminal block to the stator, The insulating member extends outward in the radial direction of the stator and is arranged on the outer peripheral side of the cylindrical portion of the housing to also serve as the insulator.

4. The rotating electrical machine according to claim 2, characterized in that comprising an insulating member, wherein the insulating member fixes the terminal block to the stator, The insulating member extends outward in the radial direction of the stator and is arranged on the outer peripheral side of the cylindrical portion of the housing to also serve as the insulator.

5. The rotating electrical machine according to any one of claims 1 to 4, characterized in that The end portion of the terminal is a plate-like member having a uniform thickness.

6. The rotating electrical machine according to any one of claims 1 to 4, characterized in that The plate portion has an arc surface joined to an outer peripheral surface of the cylindrical portion of the housing, and a recessed portion connected to the end portion of the terminal via the insulator.

7. The rotating electrical machine according to claim 5, characterized in that The plate portion has an arc surface joined to an outer peripheral surface of the cylindrical portion of the housing, and a recessed portion connected to the end portion of the terminal via the insulator.

8. The rotating electrical machine according to claim 6, characterized in that The plate portion is welded to the outer peripheral surface of the cylindrical portion of the housing.

9. The rotating electrical machine according to claim 7, characterized in that The plate portion is welded to the outer peripheral surface of the cylindrical portion of the housing.

10. The rotating electrical machine according to any one of claims 1 to 4 and claims 7 to 9, characterized in that: The housing has a refrigerant flow path disposed therein.

11. The rotating electrical machine according to claim 5, characterized in that The housing has a refrigerant flow path disposed therein.

12. The rotating electrical machine according to claim 6, characterized in that The housing has a refrigerant flow path disposed therein.

13. The rotating electrical machine according to claim 10, characterized in that The shell 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.

14. The rotating electrical machine according to claim 11 or 12, characterized in that: The shell 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.

15. The rotating electrical machine according to any one of claims 1 to 4, claims 7 to 9, and claims 11 to 13, characterized in that: The insulator is made of insulating varnish, insulating resin or rubber material.

16. The rotating electrical machine according to claim 5, characterized in that The insulator is made of insulating varnish, insulating resin or rubber material.

17. The rotating electrical machine according to claim 6, characterized in that The insulator is made of insulating varnish, insulating resin or rubber material.

18. The rotating electrical machine according to claim 10, characterized in that The insulator is made of insulating varnish, insulating resin or rubber material.

19. The rotating electrical machine according to claim 14, characterized in that The insulator is made of insulating varnish, insulating resin or rubber material.

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