WO2019159240A1

WO2019159240A1 - Rotating electrical machine

Info

Publication number: WO2019159240A1
Application number: PCT/JP2018/004936
Authority: WO
Inventors: 裕一早川
Original assignee: 日産自動車株式会社
Priority date: 2018-02-13
Filing date: 2018-02-13
Publication date: 2019-08-22
Also published as: JP6852817B2; JPWO2019159240A1

Abstract

The present invention is a rotating electrical machine which can cool a stator from the outer peripheral side using a first coolant and a second coolant, wherein the rotating electrical machine is provided with: an inner case that accommodates the stator; an outer case disposed on the outer peripheral side of the inner case; a first channel, which is formed in the circumferential direction of the rotating electrical machine between the inner case and the outer case by recessing the outer peripheral surface of the inner case or the inner peripheral surface of the outer case, and through which the first coolant passes; a second channel, which is formed in the outer case in the axial direction of the rotating electrical machine and through which the second coolant passes; a coolant retention section, which is formed in the inner case, communicates with the second channel, and stores the second coolant fed through the second channel; and a first opening section, which is formed in the inner case, faces a coil end of the stator, and communicates with the coolant retention section.

Description

Rotating electric machine

The present invention relates to a rotating electrical machine.

In Patent Document 1, a housing capable of accommodating a motor, a water jacket disposed along the peripheral surface of the stator, and a first formed along the axial direction on the radially outer side of the water jacket in the wall portion of the housing. An oil passage, a second oil passage that supplies cooling oil to a first transition portion of a coil that is formed in the stator core and protrudes from one end of the stator core in the axial direction, a first oil passage, and a second oil passage Cooling oil is supplied to a second transition portion of a coil provided between the oil passage and protruding from the other end of the stator core, and the oil is distributed from the first oil passage to the second oil passage. An oil distribution path is disclosed.

The motor disclosed in JP2010-263715A includes an oil distribution path, so that the cooling oil flowing through the first oil path is dropped onto the second transition part of the coil and the second oil path formed in the stator core. And is also dropped onto the first transition part of the coil. As described above, in the motor disclosed in JP2010-263715A, motor structural components such as a stator disposed 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, in order to circulate oil as refrigerant in the first and second transition portions of the coil, the second oil passage formed in the stator core from the first oil passage formed in the housing. An oil distribution path for distributing oil to the oil path is required. For this reason, the motor described in JP2010-263715A has a problem that the cost for preparing an oil distribution path increases.

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

According to one aspect of the present invention, there is provided a rotating electrical machine capable of cooling a stator from the outer peripheral side using a first refrigerant and a second refrigerant. This rotating electrical machine includes an inner case that accommodates a stator, an outer case that is 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. A first flow path that is formed along the circumferential direction of the rotating electrical machine and through which the first refrigerant passes, and a second flow path that is formed along the axial direction of the rotating electrical machine of the outer case and through which the second refrigerant passes. A refrigerant passage that is formed in the inner case, communicates with the second flow path and stores the second refrigerant sent through the second flow path, and a stator coil formed in the inner case. 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 a first embodiment of the present invention. FIG. 2 is an enlarged view of a main part showing an enlarged main part of a cross section taken along line II-II in FIG. FIG. 3 is a schematic configuration diagram showing a motor according to the second embodiment of the present invention. FIG. 4 is a schematic configuration diagram showing a motor according to the third embodiment of the present invention. FIG. 5 is a schematic configuration diagram showing a modification of the motor according to the third embodiment of the present invention. FIG. 6 is a schematic configuration diagram showing a motor according to the fourth embodiment of the present invention. FIG. 7 is a schematic diagram illustrating a stator used in the motor according to the fourth embodiment. FIG. 8 is a schematic diagram illustrating a stator shown as a modification of the stator used in the motor according to the fourth embodiment. FIG. 9 is a schematic diagram 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. A motor 1 shown in FIG. 1 functions as an electric motor that rotates by receiving power supplied from a power source such as a battery and drives wheels of a vehicle. The motor 1 also functions as a generator that generates power by being driven by an external force. Therefore, the motor 1 is configured as a so-called rotating 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 disposed on the outer peripheral side of the rotor 10, and a case 30 that houses the rotor 10 and the stator 20.

The rotor 10 is disposed inside the stator 20 so as to be rotatable with respect to the stator 20. The rotor 10 has a rotor shaft 11 as a rotating 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. A U-phase, V-phase, and W-phase coil is wound around the teeth of the stator 20, and the end of the wound coil (hereinafter referred to as a coil end 22) is the shaft of the motor 1 rather than the stator 20. Projects outward in the direction. The outer peripheral surface of the stator 20 is fixed to the inner case 40 in a state of being in surface contact with the inner peripheral surface of the inner case 40 described later.

The case 30 includes the above-described inner case 40 and an outer case 50 that is 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 that can accommodate 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.

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

Further, a flange 44 protruding in the radial direction of the case is formed at the end portion 43 on the outer side in the axial direction of the motor 1 with respect to the seal groove 42B of the inner case 40. The flange 44 functions as a stopper that restricts the position of the outer case 50 in the axial direction of the motor 1 when the outer case 50 is disposed in the inner case 40.

In the inner case 40, a refrigerant reservoir 45 is formed. In the motor 1, the refrigerant reservoir 45 is formed so as to be positioned above the coil end 22 that protrudes from the teeth of the stator 20. The refrigerant storage unit 45 communicates with a second flow path 51 to 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 reservoir 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 approximately 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 and the above-described refrigerant reservoir 45. In the present embodiment, cooling oil is used as the second refrigerant.

In a state where 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 are Is sealed by O-rings 33 and 34 (see FIG. 1). Therefore, the coolant flowing through the first flow path 41 formed by being recessed in the outer peripheral surface of the inner case 40 does not leak out of the motor 1.

Although not shown, the outer case 50 has a supply port for supplying the coolant to the first flow path 41 and a discharge port for discharging the coolant from the first flow path 41 to the outside. The coolant is configured to circulate through 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 the cooling oil as the 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. The oil pump 60 collects the cooling oil from the bottom of the motor 1, cools it, and cools the second flow path 51. Shed.

FIG. 2 is an enlarged view of the main part showing the main part of the cross section taken along the line II-II in FIG. In the motor 1, the refrigerant reservoir 45 is formed on a part of the outer peripheral surface of the inner case 40 by wall portions w <b> 1 and w <b> 2 that protrude outward in the radial direction. The wall portions w1 and w2 are preferably formed symmetrically across 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. Is preferably less than 180 °. From the viewpoint of suitably dropping the second refrigerant onto the coil end 22, the angle θ formed by the walls w1, w2 is preferably 90 °.

Further, as shown in FIG. 2, a plurality of first openings 46 are formed in the refrigerant reservoir 45 along 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, one of the three first openings 46 is preferably disposed on an imaginary 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 unit 45 and dropped from the first opening 46 to the coil end 22.

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

Further, in the motor 1, a refrigerant reservoir 45 in which a first opening 46 facing the coil end 22 of the stator 20 is formed in the inner case 40. For this reason, 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 passes through the coil of the stator 20 from the first opening 46. Since it is dripped at the end 22, the cooling efficiency of the motor 1 can be increased.

Further, as shown in FIG. 2, the refrigerant reservoir 45 is formed with one first opening 46 symmetrically about the imaginary line L, one on the imaginary line L passing through the axis of the rotor 10. 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 the motor 2 according to the second embodiment of the present invention. In the motor 2 shown as the second embodiment, components having the same functions as those described in the motor 1 are denoted by the same reference numerals and detailed description thereof is omitted.

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

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

The inner case 240 has a first opening 246 that faces the coil end 22 of the stator 20 from the refrigerant reservoir 245. Further, in the inner case 240, an inner case opening 247 that directly faces a 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 reservoir 245 and a second opening 253 that communicates the second flow path 51 and the inner case opening 247. Has been.

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 from the second opening 253 through the inner case opening 247 to the coil end 22 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. The motor 2 can cool the first refrigerant and the inner case 240 by the second refrigerant flowing through the second flow path 51 by providing the outer case 250 with the second flow path 51.

Further, the motor 2 has a refrigerant reservoir 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. For this reason, 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 includes the refrigerant reservoir 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. Is increased.

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

The motor 3 includes a case 330 that accommodates the rotor 10 and the stator 20 as shown in FIG. The case 330 includes an inner case 340 and an outer case 350 that is 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. In the inner case 340,

refrigerant reservoirs

345 and 346 are formed on both the upstream side and the downstream side of the first flow path 41. The refrigerant storage part 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 part 346 is in 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 faces the coil end 22 located on the upstream side of the second flow path 51, and is located on the downstream side of the second opening 51 and the first opening 347 communicating with the refrigerant storage part 345. A first opening 348 that faces the coil end 22 and communicates with the refrigerant reservoir 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 part 345, and a second opening 353 that communicates the second flow path 51 and the refrigerant storage part 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. The motor 3 can cool the first refrigerant and the inner case 340 by the second refrigerant flowing through the second flow path 51 by providing the outer case 350 with the second flow path 51.

Also, the motor 3 has a refrigerant storage part 345 in which a first opening 347 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 340. For this reason, 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 includes the refrigerant reservoir 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. Cooling efficiency is increased.

Moreover, since the refrigerant | coolant storage part 346 is also provided in the downstream of the 2nd flow path 51 with respect to the 1st flow path 41, after a 2nd refrigerant | coolant is once stored in the refrigerant | coolant storage part 346, it is 1st opening part. It is dropped from 348 toward the coil end 22. Accordingly, since the second refrigerant can be stably supplied to the coil end 22, the cooling efficiency is improved.

<Modification of Third Embodiment>
FIG. 5 is a schematic configuration diagram showing a modification of the motor 3 according to the third embodiment of the present invention. In the motor 4 shown in FIG. 5, a second opening 354 that communicates the second flow path 51 and the refrigerant reservoir 345 with the outer case 350, and a second that communicates the second flow path 51 and the refrigerant reservoir 346. An opening 355 is formed.

In the second flow path 51, the size of the second opening 355 communicating with the refrigerant storage section 346 (corresponding to the downstream communication section) located on the downstream side is located on the upstream side with respect to the first flow path 41. It is formed 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 along the axial direction of the motor 4 of the second opening 355 located on the downstream side is equal to that 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 along the axial direction of the motor 4 of the second opening 355 located on the downstream side of the first flow path 41 in the second flow path 51 is located on the upstream side. The second opening 354 is formed larger than the cross-sectional area along the axial direction of the motor 4. For this reason, the amount of the second refrigerant flowing into the refrigerant reservoir 346 can be increased on the downstream side, compared to the amount of the second refrigerant flowing into the refrigerant reservoir 345 on the upstream side. Thereby, the amount of the second refrigerant flowing into the

refrigerant reservoirs

345 and 346 can be made uniform on the upstream side near the oil pump 60 where the flow velocity is high and on the downstream side where the flow velocity is away from the oil pump 60 and the flow velocity is reduced.

Therefore, according to the motor 4, the refrigerant reservoir 345 is provided on the upstream side of the second flow path 51 with respect to the first flow path 41, so that the low-temperature oil sent from the oil pump 60 is quickly supplied to the coil end 22. In addition, the second refrigerant can be dripped from the refrigerant reservoir 346 disposed on the downstream side of the second flow path 51 toward the coil end 22 without any spots. Therefore, the cooling efficiency is increased.

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

The motor 5 includes a stator 520 as shown in FIG. 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 fitted on the outer peripheral side of the inner case 540.

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

The first flow path 41 through which the first refrigerant passes is formed on the outer peripheral surface of the inner case 540. In the inner case 540, a refrigerant reservoir 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 and the refrigerant reservoir 545. 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 reservoir 545.

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

In the motor 5 described above, the first opening 546 facing the coil end 22 of the stator 520 and the third opening 547 facing the groove 522 formed in the stator 520 are formed on the upstream side of the second flow path 51 of the inner case 540. It has the formed refrigerant storage part 545. For this reason, the motor 5 does not require another 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. In addition, according to the motor 4, the second refrigerant can be dropped from the refrigerant reservoir 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 that has flowed 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 increased.

<Modification of Stator in Fourth Embodiment>
The shape of the groove 522 in the fourth embodiment can be changed. FIG. 8 is a schematic diagram illustrating a stator 570 shown as a modification. The stator 570 has a groove portion 591 formed in a spiral shape on the outer surface. By using the stator 570 shown in FIG. 7, the second refrigerant can flow through the groove 591 so as to surround the outer periphery of the stator 570 from the refrigerant reservoir 445 through the third opening 547. Thereby, the cooling efficiency of the stator 570 can be increased.

In addition, the stator 520 used in the fourth embodiment and the stator 570 shown as a modification can be realized by stacking a plurality of electromagnetic steel sheets.

FIG. 9 is a schematic diagram illustrating the configuration of the stator 570. The stator 570 is formed by laminating a plurality of disc-shaped

electromagnetic steel plates

571, 572, 573,. In the

electromagnetic steel plates

571, 572, 573,..., 57n,

notches

581, 582, 583,.

And the groove part 522 can be formed by aligning the notch part of adjacent electromagnetic steel plates, and laminating | stacking. Moreover, the groove part 591 can be formed by laminating | stacking in the state shifted little by little in the circumferential direction of the motor 4 so that a part of notch part of adjacent electromagnetic steel plates may overlap.

[Other Embodiments]
Although the embodiment of the present invention has been described above, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Not the purpose. Various changes and modifications can be made to the above embodiments 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. However, the motor 1 may be used for an apparatus other than a vehicle, for example, an industrial machine such as a construction machine, a household electric apparatus, or a conveyor.

In the above-described embodiment, a liquid such as water or oil may be employed as the first refrigerant in addition to the coolant. A gas such as air may be employed. In the above-described embodiment, the first refrigerant and the second refrigerant may be the same refrigerant.

In the embodiment described above, the first flow path 41 only needs to form a sealed flow path between the inner case 40 and the outer case 50, and is recessed on the inner peripheral surface of the outer case 50. Also good.

In the above-described embodiment, the first opening 46 formed in the motor 1 may be one. There may also be three or more.

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

Claims

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