JP6852817B2 - Rotating machine - Google Patents

Description

The present invention relates to a rotary electric machine.

In Patent Document 1, a housing capable of accommodating a motor, a water jacket arranged along the peripheral surface of the stator, and a first formed along the axial direction on the radial outer side of the water jacket on the wall portion of the housing. An oil passage, a second oil passage for supplying cooling oil to a first crossing portion of a coil formed in the stator core and protruding from one end in the axial direction of the stator core, a first oil passage, and a second oil passage. Cooling oil is supplied to the second crossing portion of the coil which is provided between the oil passage and is formed so as to project from the other end of the stator core, and the oil is distributed from the first oil passage to the second oil passage. A motor comprising an oil distribution path is disclosed.

Since the motor disclosed in JP2010-263715A is provided with an oil distribution path, the cooling oil flowing through the first oil passage is dropped onto the second crossover of the coil and the second oil passage formed in the stator core. Is also dropped on the first crossover of the coil. As described above, in the motor disclosed in JP2010-263715A, the motor structural parts such as the stator arranged in the housing are cooled from the outer peripheral side by the water jacket and the cooling oil.

In the motor described in JP2010-263715A, a second oil passage formed in the housing is formed in the stator core in order to circulate oil as a refrigerant in the first crossover portion and the second crossover portion of the coil. It requires an oil distribution channel to distribute oil to the oil channel. Therefore, in the motor described in JP2010-263715A, there is a problem that the cost for preparing the oil distribution path increases.

An object of the present invention is to provide a technique capable of reducing the number of parts and increasing the cooling efficiency by improving the flow path of the refrigerant used for increasing the cooling efficiency of the rotary electric machine.

According to one aspect of the present invention, there is provided a rotary electric machine capable of cooling the stator from the outer peripheral side using the first refrigerant and the second refrigerant. In this rotary electric machine, an inner case for accommodating a stator, an outer case provided on the outer peripheral side of the inner case, and one of the outer peripheral surface of the inner case or the inner peripheral surface of the outer case are recessed between these cases. A first flow path formed along the circumferential direction of the rotary electric machine and through which the first refrigerant passes, and a second flow path formed along the axial direction of the rotary electric machine of the outer case through which the second refrigerant passes. A refrigerant storage unit formed in the inner case and communicated with the second flow path and storing the second refrigerant sent through the second flow path, and a stator coil formed in the inner case. It is configured to include a first opening that faces the end and communicates with the refrigerant reservoir.

FIG. 1 is a schematic configuration diagram showing a motor according to the first embodiment of the present invention. FIG. 2 is an enlarged view of a main part of the cross section taken along line II-II in FIG. 1 in an enlarged manner. FIG. 3 is a schematic configuration diagram showing a motor according to a second embodiment of the present invention. FIG. 4 is a schematic configuration diagram showing a motor according to a third embodiment of the present invention. FIG. 5 is a schematic configuration diagram showing a modified example of the motor according to the third embodiment of the present invention. FIG. 6 is a schematic configuration diagram showing a motor according to a fourth embodiment of the present invention. FIG. 7 is a schematic view illustrating a stator used in the motor according to the fourth embodiment. FIG. 8 is a schematic view illustrating a stator shown as a modification of the stator used in the motor according to the fourth embodiment. FIG. 9 is a schematic view illustrating a configuration of a stator used in the motor according to the fourth embodiment.

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

[First Embodiment]
FIG. 1 is a schematic configuration diagram showing a motor 1 according to the first embodiment of the present invention. The motor 1 shown in FIG. 1 rotates by receiving electric power supplied from a power source such as a battery, and functions as an electric motor for driving the wheels of a vehicle. The motor 1 also functions as a generator that is driven by an external force to generate electricity. Therefore, the motor 1 is configured as a so-called rotary electric machine (motor generator) that functions as an electric motor and a generator.

As shown in FIG. 1, the motor 1 includes a rotor 10, a stator 20 arranged on the outer peripheral side of the rotor 10, and a case 30 for accommodating the rotor 10 and the stator 20.

The rotor 10 is rotatably arranged inside the stator 20 with respect to the stator 20. The rotor 10 has a rotor shaft 11 as a rotation shaft. The rotor shaft 11 is rotatably supported by bearings 31 and 32 provided on the case 30.

The stator 20 is a cylindrical member formed by laminating a plurality of electromagnetic steel plates 21. U-phase, V-phase, and W-phase coils are wound around the teeth of the stator 20, and the end of the wound coil (hereinafter referred to as the coil end 22) is a shaft of the motor 1 rather than the stator 20. It protrudes outward in the direction. The outer peripheral surface of the stator 20 is fixed to the inner case 40 in a state of surface contact with the inner peripheral surface of the inner case 40 described later.

The case 30 includes the above-mentioned inner case 40 and an outer case 50 that is externally fitted on the outer peripheral side of the inner case 40.

The inner case 40 accommodates the stator 20. The inner case 40 is a housing configured as a cylindrical member capable of accommodating the stator 20. The inner peripheral surface of the inner case 40 is formed as a flat installation surface on which the stator 20 is installed.

Further, a first flow path 41 through which the first refrigerant passes is formed on the outer peripheral surface of the inner case 40. The first flow path 41 is recessed along the circumferential direction of the motor 1 over the entire circumference of the outer peripheral surface of the inner case 40. The first flow path 41 functions as a flow path through which a coolant (coolant), which is a first refrigerant for cooling the stator 20 and the like, flows between the outer case 50 and the inner case 40.

In the inner case 40, the outer diameter of the end side of the motor 1 in the axial direction with respect to the first flow path 41 is formed to be larger than the outer diameter at the position where the first flow path 41 is formed. Further, seal grooves 42A and 42B into which O-rings 33 and 34 (see FIG. 1) are fitted are formed on the end side of the motor 1 in the axial direction with respect to the first flow path 41.

Further, a flange 44 projecting in the case radial direction is formed at the end portion 43 on the axially outer side of the motor 1 from the seal groove 42B of the inner case 40. The flange 44 functions as a stopper that regulates the axial position of the motor 1 of the outer case 50 when the outer case 50 is arranged in the inner case 40.

A refrigerant storage portion 45 is formed in the inner case 40. The refrigerant storage unit 45 is formed in the motor 1 so as to be located above the coil end 22 protruding from the teeth of the stator 20. The refrigerant storage unit 45 communicates with the second flow path 51, which will be described later, and stores the second refrigerant sent through the second flow path 51. Further, the inner case 40 is formed with a first opening 46 that faces the coil end 22 protruding from the teeth of the stator 20 and communicates with the refrigerant storage portion 45.

The outer case 50 is a housing configured as a cylindrical member into which the inner case 40 can be inserted. The inner diameter of the outer case 50 is set to be substantially equal to or slightly larger than the outer diameter of the inner case 40, and is configured to be fitted on the outer peripheral surface of the inner case 40.

The outer case 50 is formed with a second flow path 51 through which the second refrigerant passes. The second flow path 51 is formed along the axial direction of the motor 1. The outer case 50 is formed with a second opening 52 that communicates the second flow path 51 with the above-mentioned refrigerant storage portion 45. In this embodiment, cooling oil is used as the second refrigerant.

When the outer case 50 is attached to the inner case 40, one end surface of the outer case 50 abuts on the side surface of the flange 44 of the inner case 40, and the inner peripheral surface of the outer case 50 and the outer peripheral surface of the inner case 40 The space is sealed by O-rings 33 and 34 (see FIG. 1). Therefore, the cooling liquid flowing through the first flow path 41 formed by being recessed on the outer peripheral surface of the inner case 40 does not leak to the outside of the motor 1.

Further, although not shown, the outer case 50 has a supply port for supplying the cooling liquid to the first flow path 41 and a discharge port for discharging the cooling liquid from the first flow path 41 to the outside. The coolant is configured to circulate in the first flow path 41 of the motor 1 by a coolant pump (not shown).

Further, the motor 1 includes an oil pump 60 for circulating and cooling cooling oil as a second refrigerant. Although not shown, the motor 1 is formed with a flow path for collecting the cooling oil dropped in the housing of the inner case 40.

The oil pump 60 is connected to a cooling oil recovery path and a second flow path 51 formed in the outer case 50, collects the cooling oil from the bottom of the motor 1, cools it, and cools the second flow path 51. Flow to.

FIG. 2 is an enlarged view of a main part of the cross section taken along line II-II in FIG. 1 in an enlarged manner. In the motor 1, the refrigerant storage portion 45 is formed on a part of the outer peripheral surface of the inner case 40 by wall portions w1 and w2 protruding outward in the radial direction. The wall portions w1 and w2 are preferably formed symmetrically with a virtual line L passing through the axis of the rotor 10 in a cross section perpendicular to the rotation axis of the rotor 10 shown in FIG. The angle θ formed by the two is preferably less than 180 °. From the viewpoint of preferably dropping the second refrigerant onto the coil end 22, the angle θ formed by the wall portions w1 and w2 is preferably 90 °.

Further, as shown in FIG. 2, a plurality of first openings 46 are formed in the refrigerant storage portion 45 in the circumferential direction of the motor 1. In the present embodiment, the three first openings 46 are formed at equal intervals. From the viewpoint of dropping the second refrigerant onto the coil end 22, it is preferable that the first opening 46 of one of the three is arranged on the virtual line L passing through the axis of the rotor 10.

The second refrigerant sent through the second flow path 51 is stored in the refrigerant storage section 45, and is dropped from the first opening 46 to the coil end 22.

According to the motor 1 described above, by recessing one of the outer peripheral surfaces of the inner case 40, a first refrigerant is formed between the inner case 40 and the outer case 50 along the circumferential direction of the motor 1. The stator 20 can be cooled by providing the first flow path 41 through which the stator 20 passes. Further, the motor 1 is provided with a second flow path 51 formed in the outer case 50 along the axial direction of the motor 1 through which the second refrigerant passes, so that the motor 1 flows through the second flow path 51. The refrigerant can cool the first refrigerant and the inner case 40.

Further, in the motor 1, a refrigerant storage portion 45 having a first opening 46 facing the coil end 22 of the stator 20 is formed in the inner case 40. Therefore, the motor 1 does not require a separate member for storing the second refrigerant between the inner case 40 and the coil end 22. Further, according to the motor 1, the second refrigerant that flows through the second flow path 51 of the outer case 50 and is stored in the refrigerant storage portion 45 formed in the inner case 40 flows from the first opening 46 to the coil of the stator 20. Since it is dropped on the end 22, the cooling efficiency of the motor 1 can be improved.

Further, as shown in FIG. 2, the refrigerant storage unit 45 is formed with one first opening 46 on the virtual line L passing through the axis of the rotor 10 and two symmetrical openings 46 in the virtual line L. The second refrigerant stored in the refrigerant storage unit 45 can be efficiently dropped onto the coil end 22 of the stator 20.

[Second Embodiment]
FIG. 3 is a schematic configuration diagram showing a motor 2 according to a second embodiment of the present invention. In the motor 2 shown as the second embodiment, the configurations having the same functions as the configurations described in the motor 1 are designated by the same numbers and detailed description thereof will be omitted.

As shown in FIG. 3, the motor 2 includes a case 230 that houses the rotor 10 and the stator 20. The case 230 includes an inner case 240 and an outer case 250 that is externally fitted on the outer peripheral side of the inner case 240.

A first flow path 41 through which the first refrigerant passes is formed on the outer peripheral surface of the inner case 240. Further, a refrigerant storage portion 245 is formed in the inner case 40. The refrigerant storage unit 45 is formed in the motor 2 so as to be located above the coil end 22 protruding from the teeth of the stator 20. The refrigerant storage unit 245 communicates with the second flow path 51, which will be described later, and is formed on the upstream side of the second flow path 51 in the inner case 240.

The inner case 240 is formed with a first opening 246 facing the coil end 22 of the stator 20 from the refrigerant storage portion 245. Further, in the inner case 240, an inner case opening 247 that allows a second opening 253, which will be described later, to directly face the coil end 22 of the stator 20 on the downstream side of the second flow path 51 with respect to the first flow path 41. Is formed.

The outer case 250 is formed with a second opening 252 that communicates the second flow path 51 and the refrigerant storage portion 245, and a second opening 253 that communicates the second flow path 51 and the inner case opening 247. Has been done.

The second refrigerant sent through the second flow path 51 is stored in the refrigerant storage section 245 on the upstream side of the second flow path 51, and is dropped from the first opening 246 to the coil end 22. Further, the second refrigerant sent through the second flow path 51 is dropped onto the coil end 22 from the second opening 253 through the inner case opening 247 on the downstream side of the second flow path 51. ..

According to the motor 2 described above, the stator 20 can be cooled by the first refrigerant flowing through the first flow path 41. Further, the motor 2 is provided with the second flow path 51 in the outer case 250, so that the first refrigerant and the inner case 240 can be cooled by the second refrigerant flowing through the second flow path 51.

Further, the motor 2 has a refrigerant storage unit 245 in which a first opening 246 facing the coil end 22 of the stator 20 is formed on the upstream side of the second flow path 51 of the inner case 240. Therefore, the motor 2 does not require a separate member for storing the second refrigerant between the inner case 40 and the coil end 22.

Further, since the motor 2 is provided with the refrigerant storage unit 245 on the upstream side of the second flow path 51, the cooling oil having a low temperature sent from the oil pump 60 can be quickly dropped onto the coil end 22, so that the cooling efficiency is reduced. Is enhanced.

[Third Embodiment]
FIG. 4 is a schematic configuration diagram showing a motor 3 according to a third embodiment of the present invention. In the motor 3 shown as the third embodiment, the configurations having the same functions as the configurations described in the motor 1 are designated by the same numbers and detailed description thereof will be omitted.

As shown in FIG. 4, the motor 3 includes a case 330 that houses the rotor 10 and the stator 20. The case 330 includes an inner case 340 and an outer case 350 that is externally fitted on the outer peripheral side of the inner case 340.

A first flow path 41 through which the first refrigerant passes is formed on the outer peripheral surface of the inner case 340. Further, in the inner case 340, refrigerant storage portions 345 and 346 are formed on both the upstream side and the downstream side of the first flow path 41. The refrigerant storage unit 345 is formed on the upstream side of the second flow path 51 with respect to the first flow path 41, and the refrigerant storage unit 346 is formed on the second flow path 51 with respect to the first flow path 41. It is formed on the downstream side.

Further, the inner case 340 is located on the downstream side of the first opening 347 and the second flow path 51 facing the coil end 22 located on the upstream side of the second flow path 51 and communicating with the refrigerant storage section 345. A first opening 348 facing the coil end 22 and communicating with the refrigerant storage portion 346 is formed.

The outer case 250 is formed with a second opening 352 that communicates the second flow path 51 and the refrigerant storage portion 345, and a second opening 353 that communicates the second flow path 51 and the refrigerant storage portion 346. ing.

According to the motor 3 described above, the stator 20 can be cooled by the first refrigerant flowing through the first flow path 41. Further, the motor 3 is provided with the second flow path 51 in the outer case 350, so that the first refrigerant and the inner case 340 can be cooled by the second refrigerant flowing through the second flow path 51.

Further, the motor 3 has a refrigerant storage unit 345 having a first opening 347 facing the coil end 22 of the stator 20 formed on the upstream side of the second flow path 51 of the inner case 340. Therefore, the motor 2 does not require a separate member for storing the second refrigerant between the inner case 40 and the coil end 22.

Further, since the motor 3 is provided with the refrigerant storage unit 345 on the upstream side of the second flow path 51 with respect to the first flow path 41, the low temperature oil sent from the oil pump 60 is quickly dropped onto the coil end 22. Therefore, the cooling efficiency is improved.

Further, since the refrigerant storage unit 346 is also provided on the downstream side of the second flow path 51 with respect to the first flow path 41, the second refrigerant is temporarily stored in the refrigerant storage unit 346 and then the first opening. It is dropped from 348 toward the coil end 22. Therefore, since the second refrigerant can be stably supplied to the coil end 22, the cooling efficiency is improved.

<Modified example of the third embodiment>
FIG. 5 is a schematic configuration diagram showing a modified example of the motor 3 according to the third embodiment of the present invention. In the motor 4 shown in FIG. 5, the outer case 350 has a second opening 354 that communicates the second flow path 51 and the refrigerant storage section 345, and a second opening that communicates the second flow path 51 and the refrigerant storage section 346. An opening 355 is formed.

In the second flow path 51, the size of the second opening 355 communicating with the refrigerant storage portion 346 (corresponding to the downstream communication portion) located on the downstream side is located on the upstream side with respect to the first flow path 41. It is formed so as to be larger than the size of the second opening 354 (corresponding to the upstream communication portion) communicating with the refrigerant storage portion 345.

Specifically, in the motor 4 shown in FIG. 5, the cross-sectional area of the second opening 355 located on the downstream side along the axial direction is the cross-sectional area of the motor 4 of the second opening 354 located on the upstream side. It is larger than the cross-sectional area along the axial direction.

According to the motor 4 described above, the cross-sectional area of the second opening 355 located on the downstream side of the first flow path 41 in the second flow path 51 along the axial direction of the motor 4 is located on the upstream side. The second opening 354 is formed to be larger than the cross-sectional area of the motor 4 along the axial direction. Therefore, the amount of the second refrigerant flowing into the refrigerant storage unit 346 on the downstream side can be increased more than the amount of the second refrigerant flowing into the refrigerant storage unit 345 on the upstream side. As a result, the amount of the second refrigerant flowing into the refrigerant storage portions 345 and 346 can be made uniform between the upstream side, which is close to the oil pump 60 and has a large flow velocity, and the downstream side, which is far from the oil pump 60 and whose flow velocity decreases.

Therefore, according to the motor 4, since the refrigerant storage unit 345 is provided on the upstream side of the second flow path 51 with respect to the first flow path 41, the low temperature oil sent from the oil pump 60 is quickly supplied to the coil end 22. The second refrigerant can be dropped evenly toward the coil end 22 from the refrigerant storage unit 346 arranged on the downstream side of the second flow path 51. Therefore, the cooling efficiency is improved.

[Fourth Embodiment]
FIG. 6 is a schematic configuration diagram showing a motor 5 according to a fourth embodiment of the present invention. In the motor 5 shown as the fourth embodiment, the configurations having the same functions as the configurations described in the motor 1 are designated by the same numbers and detailed description thereof will be omitted.

The motor 5 includes a stator 520, as shown in FIG. Further, the motor 5 includes a case 530 that houses the rotor 10 and the stator 520. The case 530 includes an inner case 540 and an outer case 550 that is externally fitted on the outer peripheral side of the inner case 540.

In the motor 5 according to the fourth embodiment, a groove portion 522 recessed along the axial direction of the motor 5 is formed on the outer peripheral surface of the stator 520. The groove portion 522 receives the second refrigerant from the refrigerant storage portion 545 described later, and flows the second refrigerant to the downstream side.

A first flow path 41 through which the first refrigerant passes is formed on the outer peripheral surface of the inner case 540. Further, in the inner case 540, a refrigerant storage portion 545 is formed on the upstream side of the second flow path 51 with respect to the first flow path 41.

The outer case 550 is formed with a second opening 552 that communicates the second flow path 51 with the refrigerant storage portion 545. Further, in the motor 5, the inner case 540 is formed with a third opening 547 that faces the groove 522 and communicates with the refrigerant storage portion 545.

FIG. 7 is a schematic diagram illustrating a stator 520 used in the motor 5. As shown in FIG. 7, the second refrigerant can flow from the refrigerant storage portion 545 through the third opening 547 into the groove portion 522 of the stator 520.

In the motor 5 described above, the inner case 540 has a first opening 546 facing the coil end 22 of the stator 520 and a third opening 547 facing the groove 522 formed in the stator 520 on the upstream side of the second flow path 51. It has a formed refrigerant storage portion 545. Therefore, the motor 5 does not require a separate member for storing the second refrigerant between the inner case 540 and the coil end 22.

Further, according to the motor 5 described above, the stator 520 can be cooled by the first refrigerant flowing through the first flow path 41. Further, according to the motor 4, the second refrigerant can be dropped from the refrigerant storage portion 545 through the first opening 546 to the coil end 22 from the first opening 546 located on the upstream side of the second flow path 51. Since the second refrigerant can flow directly from the third opening 547 to the stator 520, the stator 420 can be cooled.

Further, since the second refrigerant flowing through the groove 522 is dropped onto the coil end 22 located on the downstream side of the second flow path 51, the cooling efficiency of the motor 4 can be improved.

<Modification example of stator in the fourth embodiment>
The shape of the groove portion 522 in the fourth embodiment can be changed. FIG. 8 is a schematic view illustrating the stator 570 shown as a modified example. The stator 570 has a groove 591 formed spirally on the outer surface. By using the stator 570 shown in FIG. 7, the second refrigerant can flow from the refrigerant storage portion 445 through the third opening 547 and through the groove portion 591 so as to surround the outer circumference of the stator 570. As a result, the cooling efficiency of the stator 570 can be increased.

The stator 520 used in the fourth embodiment and the stator 570 shown as a modification can be realized by laminating a plurality of electromagnetic steel sheets.

FIG. 9 is a schematic view illustrating the configuration of the stator 570. The stator 570 is formed by laminating a plurality of disk-shaped electromagnetic steel plates 571, 57, 573, ..., 57n. Notches 581, 582, 583, ..., 58n are formed in a part of the outer edges of the electromagnetic steel sheets 571, 57, 573, ..., 57n, respectively.

Then, the groove portion 522 can be formed by aligning the cutout portions of the adjacent electromagnetic steel sheets and laminating them. Further, the groove portion 591 can be formed by laminating in a state of being slightly shifted in the circumferential direction of the motor 4 so that a part of the cutout portions of the adjacent electromagnetic steel sheets overlap each other.

[Other Embodiments]
Although the embodiment of the present invention has been described above, the above-described embodiment shows only a part of the application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above-described embodiment. Not the purpose. Various changes and amendments can be made to the above embodiment within the scope of the matters described in the claims.

In the above-described embodiment, the motor 1 has been described as a motor generator for an electric vehicle, but it may be used for equipment other than vehicles, for example, construction machinery, household electrical equipment, or industrial machinery such as a conveyor.

Further, in the above-described embodiment, a liquid such as water or oil may be adopted as the first refrigerant in addition to the cooling liquid. Further, a gas such as air may be adopted. Further, in the above-described embodiment, the first refrigerant and the second refrigerant may be the same refrigerant.

In the above-described embodiment, the first flow path 41 need only have a closed flow path formed between the inner case 40 and the outer case 50, and is recessed in the inner peripheral surface of the outer case 50. May be good.

In the above-described embodiment, the number of the first openings 46 formed in the motor 1 may be one. Also, there may be three or more.

In the fourth embodiment, the groove portion 522 is described as being recessed in the outer peripheral surface of the stator 520, but the groove portion may be formed in the inner peripheral surface of the inner case 540. The same applies to the groove portion 591.

Claims (9)

A rotary electric machine capable of cooling the stator from the outer peripheral side using the first refrigerant and the second refrigerant.
An inner case for accommodating the stator and
An outer case provided on the outer peripheral side of the inner case and
By recessing either the outer peripheral surface of the inner case or the inner peripheral surface of the outer case, a first flow path is formed between the cases along the circumferential direction of the rotary electric machine and the first refrigerant passes through. When,
A second flow path formed along the axial direction of the rotary electric machine of the outer case and through which the second refrigerant passes, and
A refrigerant storage unit formed in the inner case, communicated with the second flow path, and stores the second refrigerant sent through the second flow path, and a refrigerant storage unit.
A first opening formed in the inner case, facing the coil end of the stator, and communicating with the refrigerant storage portion,
Rotating electric machine equipped with. The rotary electric machine according to claim 1.
In the refrigerant storage portion, a plurality of the first openings are formed in the circumferential direction of the rotary electric machine.
A rotating electric machine characterized by that. The rotary electric machine according to claim 1 or 2.
The refrigerant storage portion is formed on both the upstream side and the downstream side of the second flow path in the inner case.
A rotating electric machine characterized by that. The rotary electric machine according to claim 3.
The outer case is formed with a communication portion that communicates the refrigerant storage portion and the second flow path.
The size of the downstream communication portion communicating with the refrigerant storage portion located on the downstream side of the second flow path is the upstream communication portion communicating with the refrigerant storage portion located on the upstream side of the second flow path. Larger than the size of
A rotating electric machine characterized by that. The rotary electric machine according to claim 1 or 2.
The refrigerant storage portion is formed on the upstream side of the second flow path in the inner case.
A rotating electric machine characterized by that. The rotary electric machine according to claim 5.
A rotary electric machine characterized in that an inner case opening is formed on the downstream side of the second flow path so as to directly face the coil end of the stator from the outer case. The rotary electric machine according to claim 5.
A groove formed along the axial direction of the rotary electric machine by recessing one of the inner peripheral surface of the inner case and the outer peripheral surface of the stator.
A second opening formed in the inner case, facing the groove, and communicating with the refrigerant storage portion,
A rotary electric machine characterized by being equipped with. The rotary electric machine according to claim 7.
The groove is spirally formed on the outer peripheral surface of the stator.
A rotating electric machine characterized by that. The rotary electric machine according to claim 8.
The stator is formed by laminating a plurality of disk-shaped electromagnetic steel plates.
A notch is formed in a part of the outer edge of the disk-shaped electromagnetic steel plate.
A rotary electric machine characterized in that a groove is formed by laminating adjacent disc-shaped electromagnetic steel sheets in a state of being shifted in the circumferential direction of the rotary electric machine so that a part of the notch portion overlaps. ..

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