JP2022071957A - Stator of rotary electric machine - Google Patents

Abstract

To provide a stator of a rotary electric machine capable of improving cooling performance of a coil end.SOLUTION: A stator 20 of a rotary electric machine includes a stator core 21, a coil 22 having a coil end 23, and a cooling jacket 25 mounted on the stator core 21 so as to accommodate the coil end 23 inside, and allowing cooling oil to flow inside, the coil end 23 includes a plurality of first portions 231 extending parallel to an end face 21c of the stator core 21, a plurality of pairs of second portions 232 connected to both ends of the first portions 231 and extending along a direction parallel to an axial direction, the cooling jacket 25 includes a pair of wall portions facing each other in a radial direction of the stator core 21, and one or more rectifying fins provided on at least one side of inner surfaces of the pair of wall portions, and the rectifying fins are provided so as to face the coil end 23 toward one side in a circumferential direction of the stator core 21.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a stator of a rotary electric machine.

As a stator for a conventional rotary electric machine, Japanese Patent No. 5286397 (Patent Document 1) discloses that the coil ends protruding from both ends in the axial direction of the stator core are formed in a U shape facing the axial direction. Has been done.

Japanese Patent No. 5286397

In order to cool the coil end, a structure is conceivable in which cooling jackets are provided at both ends in the axial direction of the stator core so as to cover the end coil, and cooling oil flows into the cooling jacket. When the coil end is formed in a substantially U shape facing the axial direction as in Patent Document 1, the physique of the stator can be reduced, but the coil ends are densely packed and the coil end in the radial direction of the stator. The gap between them becomes narrower. Therefore, if the cooling jacket is provided without any means, the cooling oil preferentially flows between the coil ends located on both ends in the radial direction of the stator and the cooling jacket. In this case, there is a concern that the cooling oil will not be sufficiently distributed to the details of the coil end, and the cooling performance of the coil end will be deteriorated.

The present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide a stator of a rotary electric machine capable of improving the cooling performance of a coil end.

The starter of a rotary electric machine according to the present disclosure has a stator core having one end and the other end in the axial direction, and a coil end having a coil end protruding outward from the one end and the other end of the stator core, and a coil mounted on the stator core. And a cooling jacket that is attached to each of the one end and the other end of the stator core so as to accommodate the coil end inside, and the cooling oil flows inside. The coil ends are connected to both ends of a plurality of first portions extending parallel to the end faces of the stator core in the axial direction and each of the plurality of first portions in the extending direction of the first portion. It includes a pair of second portions extending along a direction parallel to the axial direction. The cooling jacket includes a pair of wall portions facing each other in the radial direction of the stator core, and rectifying fins provided on at least one side of the inner surface of each of the pair of wall portions. The rectifying fin is provided so as to approach the coil end toward one side in the circumferential direction of the stator core.

As in the above configuration, the coil ends are connected to both ends of each of a plurality of first portions extending parallel to the end faces of the stator core and each of the plurality of first portions, extending along a direction parallel to the axial direction. By including a plurality of pairs of second portions, the plurality of first portions can be densely arranged.

In such a case, as described above, rectifying fins are provided on the inner surface of at least one of the pair of wall portions of the cooling jacket so as to approach the coil end toward one side in the circumferential direction of the stator core. As a result, the cooling oil flowing in the cooling jacket along the circumferential direction of the stator core flows toward the coil end. As a result, the cooling oil penetrates into the inside of the coil end, and the cooling oil can cool the details of the coil end. As a result, the cooling performance of the coil end can be improved.

According to the present disclosure, it is possible to provide a stator of a rotary electric machine capable of improving the cooling performance of a coil end.

It is a schematic diagram which shows the rotary electric machine which concerns on Embodiment 1. FIG. It is the schematic which partially shows the stator which concerns on Embodiment 1. FIG. It is a top view which partially shows the stator which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the rectifying fin which concerns on Embodiment 1. FIG. It is a top view which shows the rectifying fin which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the state of the cooling oil flowing in the cooling jacket which concerns on Embodiment 1. FIG. It is a top view which shows the state of the cooling oil flowing in the cooling jacket which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the state of the cooling oil flowing in the cooling jacket in the comparative example. It is a schematic diagram which shows the rectifying fin which concerns on 1st modification. It is a top view which shows the rectifying fin which concerns on the 1st modification. It is a schematic diagram which shows the rectifying fin which concerns on the 2nd modification. It is a top view which shows the rectifying fin which concerns on the 2nd modification. It is a side view which shows the rectifying fin which concerns on the 2nd modification. It is a front view which shows the rectifying fin which concerns on the 2nd modification. It is a schematic diagram which shows the rectifying fin which concerns on 3rd modification. It is a top view which shows the rectifying fin which concerns on the 3rd modification.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments shown below, the same or common parts are designated by the same reference numerals in the drawings, and the description thereof will not be repeated. Further, in the embodiment, the case where the rotary electric machine is a traveling motor mounted on a vehicle such as a hybrid vehicle or an electric vehicle will be described as an example, but the rotary electric machine is not limited to the traveling motor. It can also be applied to motors for power generation, motors for other purposes, and rotary electric machines (including generators) other than those for vehicles.

(Embodiment 1)
FIG. 1 is a schematic view showing a rotary electric machine according to the first embodiment. The rotary electric machine 10 according to the first embodiment will be described with reference to FIG.

As shown in FIG. 1, the rotary electric machine 10 includes a stator 20, a rotor 30, and a shaft 40.

The stator 20, rotor 30, and shaft 40 are housed in a housing (not shown), and the shaft 40 is rotatably supported by the housing. The stator core 21, which will be described later, included in the stator 20 is fixed to the housing by a fixing member.

The shaft 40 is fixed to a rotor core 31, which will be described later. As the shaft 40 rotates around the shaft C1, the rotor core 31 rotates integrally with the shaft 40.

The rotor 30 includes a rotor core 31. The rotor core 31 is formed by laminating a plurality of electrical steel sheets in the axis C1 direction. The rotor core 31 is provided with a plurality of holes penetrating in a direction parallel to the axis C1 direction. A permanent magnet is inserted in each of the plurality of holes.

The stator 20 includes a stator core 21, a coil 22, and cooling jackets 25 and 26.

The stator core 21 has a substantially cylindrical shape and has one end 21a and the other end 21b in the axial direction. The stator core 21 is configured by laminating a plurality of annular plates formed by punching or the like on an electromagnetic steel sheet along the axis C1 direction. The stator core 21 is arranged coaxially with the shaft 40 on the outer peripheral side of the rotor core 31.

The stator core 21 is provided with a plurality of groove-shaped slots extending in the radial direction from the inner peripheral side in the outer peripheral direction along the circumferential direction. The stator core 21 has a teeth portion in a portion located between adjacent slots in the circumferential direction.

The coil 22 is provided according to a three-phase AC circuit design, and includes a U-phase coil, a V-phase coil, and a W-phase coil. The coil 22 is mounted on the stator core 21. Specifically, the coil 22 is mounted in the slot described above. The U-phase coil, V-phase coil, and W-phase coil included in the coil 22 are fixed at predetermined installation positions corresponding to the three phases of U-phase, V-phase, and W-phase.

The coil 22 includes a coil end 23 projecting outward from one end 21a of the stator core 21 and a coil end 24 projecting outward from the other end 21b of the stator core 21.

The cooling jacket 25 is liquidtightly mounted on one end 21a of the stator core 21 so as to accommodate the coil end 23 inside. The cooling jacket 25 is provided in an annular shape. Cooling oil flows inside the cooling jacket 25, whereby the coil end 23 is cooled.

The cooling jacket 26 is liquidtightly mounted on the other end 21b of the stator core 21 so as to accommodate the coil end 24 inside. The cooling jacket 26 is provided in an annular shape. Cooling oil flows inside the cooling jacket 26, whereby the coil end 24 is cooled.

2 and 3 are schematic views and a plan view partially showing the stator according to the first embodiment. The details of the stator 20 according to the first embodiment will be described with reference to FIGS. 2 and 3. In FIG. 2, for convenience, the cooling jacket 25 is shown by a broken line and the coil end 23 is shown by a solid line on the lower side in the drawing, and the cooling jacket 25 is shown by a solid line and the coil end 23 is shown by a broken line on the upper side in the drawing. ing. Further, in FIG. 3, for convenience, the ceiling portion (connecting wall portion 253 described later) of the cooling jacket 25 is omitted.

Since one end side and the other end side of the coil 22 have substantially the same structure in the axial direction, details of the cooling jacket 25 and the coil end 23 located on the one end side of the coil 22 will be described here. Details of the cooling jacket 26 and the coil end 24 located on the other end side will be omitted.

As shown in FIGS. 2 and 3, the coil end 23 includes a plurality of first portions 231 and a plurality of pairs of second portions 232. Each of the plurality of first portions 231 extends so as to be parallel to the end surface 21c of the stator core 21. Each of the plurality of first portions 231 extends along the circumferential direction of the stator core 21. The plurality of first portions 231 are arranged side by side in the radial direction of the stator core 21 and arranged side by side in the circumferential direction of the stator core 21.

The pair of second portions 232 are provided in each of the plurality of first portions 231. The pair of second portions 232 are connected to both ends of the first portion 231 in the extending direction and extend along a direction parallel to the axis C1 direction.

The cooling jacket 25 includes an inner wall portion 251 and an outer wall portion 252, and a connecting wall portion 253. The inner wall portion 251 and the outer wall portion 252 correspond to a pair of wall portions facing each other in the radial direction of the stator core 21. The connection wall portion 253 connects the inner wall portion 251 and the outer wall portion 252 and faces the end surface 21c of the stator core 21.

A plurality of rectifying fins 254 and 255 are provided on the inner surfaces of the inner wall portion 251 and the outer wall portion 252. A plurality of rectifying fins 254 are provided on the inner surface of the inner wall portion 251, and a plurality of rectifying fins 255 are provided on the inner surface of the outer wall portion 252. The rectifying fins 254 and 255 rectify the cooling oil flowing in the cooling jacket 25.

The plurality of rectifying fins 254 are provided at a predetermined pitch in the circumferential direction. The rectifying fins 254 adjacent to each other in the circumferential direction are arranged so that the positions in the axis C1 direction are different from each other, and the plurality of rectifying fins 254 are arranged in a zigzag shape in the circumferential direction.

Similarly, the plurality of rectifying fins 255 are provided at a predetermined pitch in the circumferential direction. The rectifying fins 255 adjacent to each other in the circumferential direction are arranged so that the positions in the axis C1 direction are different from each other, and the plurality of rectifying fins 255 are arranged in a zigzag shape in the axis C1 direction along the circumferential direction.

In the above description, the case where a plurality of rectifying fins are provided on the inner surfaces of both the inner wall portion 251 and the outer wall portion 252 has been exemplified, but the present invention is not limited to this, and the rectifying fins are the inner wall portion. It may be provided on the inner surface of at least one of the 251 and the outer wall portion 252. Further, the number of rectifying fins is not limited to a plurality, and may be a single number.

4 and 5 are a schematic view and a top view showing the rectifying fins according to the first embodiment. Since the rectifying fins 254 provided on the inner wall portion 251 and the rectifying fins 255 provided on the outer wall portion 252 have a plane-symmetrical shape, the rectifying fins 255 will be mainly described here, and the details of the rectifying fins 254 will be described. The description of is omitted.

As shown in FIGS. 4 and 5, the rectifying fin 255 is provided so as to approach the coil end 23 toward one side in the circumferential direction of the stator core 21. Specifically, the rectifying fin 255 is curved so as to be radially inward of the stator core 21 toward one side in the circumferential direction of the stator core 21, and has a curved surface 255a. In this case, the rectifying fin 254 is curved so as to go outward in the radial direction of the stator core 21 toward one side in the circumferential direction of the stator core 21.

6 and 7 are schematic views and plan views showing the state of the cooling oil flowing in the cooling jacket according to the first embodiment. The state of the cooling oil flowing in the cooling jacket according to the first embodiment will be described with reference to FIGS. 6 and 7.

As shown in FIGS. 6 and 7, a plurality of rectifying fins 254 are provided on the inner wall portion 251 of the cooling jacket 25, so that the end portion of the coil end 23 located inside the stator core 21 in the radial direction and the inner wall of the cooling jacket 25 are provided. The direction of the cooling oil flowing along the circumferential direction of the stator core 21 between the portion 251 and the portion 251 can be controlled so as to be partially directed toward the coil end 23.

Similarly, by providing the outer wall portion 252 of the cooling jacket 25 with a plurality of rectifying fins 255, the stator core is provided between the end portion of the coil end 23 located on the radial outer side of the stator core 21 and the outer wall portion 252 of the cooling jacket 25. The direction of the cooling oil flowing along the circumferential direction of 21 can be controlled to partially toward the coil end 23.

As a result, the cooling oil penetrates into the coil end 23, and the cooling oil can cool the details of the coil end 23. As a result, the cooling performance of the coil end 23 can be improved.

By making the cooling jacket 26 have the same configuration as the cooling jacket 25, the details of the coil end 24 can be cooled by the cooling oil as described above, and the cooling performance of the coil end 24 can be improved.

FIG. 8 is a schematic view showing the state of the cooling oil flowing in the cooling jacket in the comparative example. With reference to FIG. 8, the state of the cooling oil flowing in the cooling jacket 25X in the comparative example will be described.

In the cooling jacket 25X in the comparative example, the rectifying fins are not provided on the inner surfaces of either the inner wall portion 251 and the outer wall portion 252. Therefore, the cooling oil flowing between the end portion of the coil end 23 located inside the stator core 21 in the radial direction and the inner wall portion 251 of the cooling jacket 25X only flows along the circumferential direction of the stator core 21.

Similarly, the cooling oil flowing between the end of the coil end 23 located on the radial outer side of the stator core 21 and the outer wall portion 252 of the cooling jacket 25X only flows along the circumferential direction of the stator core 21.

Therefore, in the comparative example, the cooling oil does not sufficiently reach the details of the coil end 23, and the cooling performance of the coil end deteriorates.

(First modification)
9 and 10 are a schematic view and a top view showing the rectifying fins according to the first modification. The rectifying fin 255A according to the first modification will be described with reference to FIGS. 9 and 10.

As shown in FIGS. 9 and 10, the rectifying fin 255 according to the first embodiment can be replaced with the rectifying fin 255A according to the first modification. Here, the rectifying fins provided on the outer wall portion 252 will be described, but the rectifying fins 254 according to the first embodiment provided on the inner wall portion 251 may be substituted in substantially the same manner as those according to the first modification. can. Even in this case, the rectifying fins provided on the inner wall portion 251 have a symmetrical shape with the rectifying fins provided on the outer wall portion 252.

The rectifying fin 255A has a substantially plate-like shape, and is provided so as to approach the coil end 23 toward one side in the circumferential direction of the stator core 21. Specifically, the rectifying fin 255A is inclined toward the radial inward side of the stator core 21 toward one side in the circumferential direction of the stator core 21, and has an inclined surface 255a1.

The smaller angle between the tangential direction of the outer wall portion 252 and the angle formed by the inclined surface 255a1 at the joint portion where the inclined surface 255a1 is joined to the outer wall portion 252 is preferably about 20 to 50 degrees.

Even when the rectifying fin 255A according to the first modification having the above-mentioned shape is used, substantially the same effect as that of the first embodiment can be obtained.

(Second modification)
11 to 14 are a schematic view, a top view, a side view, and a front view showing the rectifying fins according to the second modification. The rectifying fin 255B according to the second modification will be described with reference to FIGS. 11 to 14.

As shown in FIGS. 11 to 14, the rectifying fin 255 according to the first embodiment can be replaced with the rectifying fin 255B according to the first modification. Here, the rectifying fins provided on the outer wall portion 252 will be described, but the rectifying fins 254 according to the first embodiment provided on the inner wall portion 251 may be substituted in substantially the same manner as those according to the second modification. can. Even in this case, the rectifying fins provided on the inner wall portion 251 have a symmetrical shape with the rectifying fins provided on the outer wall portion 252.

The rectifying fin 255B is provided so as to approach the coil end 23 toward one side in the circumferential direction of the stator core 21. The straightening fin 255B has a curved surface 255a2, a first wall portion 256, and a second wall portion 257.

The curved surface 255a2 curves inward in the radial direction of the stator core 21 toward one side in the circumferential direction of the stator core 21. The curved surface 255a2 is provided so as to taper toward the coil end 23 (toward the tip).

The first wall portion 256 and the second wall portion 257 are provided so as to be aligned in the axis C1 direction. The first wall portion 256 and the second wall portion 257 are provided so as to face each other in the axis C1 direction.

The first wall portion 256 is connected to one end of the curved surface 255a2 in the axis C1 direction. The first wall portion 256 is curved so as to approach the second wall portion 257 toward the tip.

The second wall portion 257 is connected to the other end of the curved surface 255a2 in the axis C1 direction. The second wall portion 257 is curved so as to approach the first wall portion 256 toward the tip end.

When the rectifying fin 255B has the above-mentioned shape, the flow velocity of the cooling oil can be increased on the tip end side of the rectifying fin 255B. As a result, a large amount of cooling oil can be sent to the coil end 23, and the cooling performance of the coil end can be further improved.

(Third modification example)
15 and 16 are a schematic view and a top view showing the rectifying fins according to the third modification. The rectifying fin 255C according to the third modification will be described with reference to FIGS. 15 and 16.

As shown in FIGS. 15 and 16, the rectifying fin 255 according to the first embodiment can be replaced with the rectifying fin 255C according to the first modification. Here, the rectifying fins provided on the outer wall portion 252 will be described, but the rectifying fins 254 according to the first embodiment provided on the inner wall portion 251 may be substituted in substantially the same manner as those according to the third modification. can. Even in this case, the rectifying fins provided on the inner wall portion 251 have a symmetrical shape with the rectifying fins provided on the outer wall portion 252.

The rectifying fin 255C has a cylindrical shape having an inlet portion 258 and an outlet portion 259. The rectifying fin 255C is curved so as to be inward in the radial direction of the stator core 21 toward one side in the circumferential direction of the stator core 21.

The inlet 258 is open toward the other side in the circumferential direction of the stator core 21. The outlet portion 259 is open so as to face the coil end 23. More specifically, the outlet portion 259 is opened so as to face the radial inward side of the stator core 21.

The opening area of the outlet portion 259 is smaller than the opening area of the inlet portion 258, and the path connecting the inlet portion 258 and the outlet portion 259 is provided so as to taper toward the exit portion 259. ..

When the rectifying fin 255C has the above-mentioned shape, the flow velocity of the cooling oil can be increased on the tip end side of the rectifying fin 255C. As a result, a large amount of cooling oil can be sent to the coil end 23, and the cooling performance of the coil end can be further improved.

As described above, the embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of the present invention is indicated by the scope of claims and includes all modifications within the meaning and scope equivalent to the scope of claims.

10 rotary electric machine, 20 stator, 21 stator core, 21a one end, 21b other end, 21c end face, 22 coil, 23,24 coil end, 25, 25X, 26 cooling jacket, 30 rotor, 31 rotor core, 40 shaft, 231 first part , 232 2nd part, 251 inner wall part, 252 outer wall part, 253 connection wall part, 254, 255, 255A, 255B, 255C rectifying fin, 255a curved surface, 255a1 inclined surface, 255a2 curved surface, 256 first wall part, 257 2nd wall part, 258 entrance part, 259 exit part.

Claims (1)

A stator core with one end and the other end in the axial direction,
A coil having a coil end protruding outward from each of the one end and the other end and mounted on the stator core.
A cooling jacket, which is attached to each of the one end and the other end of the stator core so as to accommodate the coil end and allows cooling oil to flow inside, is provided.
The coil ends are connected to both ends of a plurality of first portions extending parallel to the end faces of the stator core in the axial direction and each of the plurality of first portions in the extending direction of the first portion. Includes a pair of second portions extending along a direction parallel to the axial direction.
The cooling jacket includes a pair of radially opposed walls of the stator core and rectifying fins provided on at least one side of the inner surface of each of the pair of walls.
The rectifying fin is a stator of a rotary electric machine provided so as to approach the coil end toward one side in the circumferential direction of the stator core.

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