Rotary electric machine

Abstract

A rotary electric machine according to the present invention comprises: a stator fixed to an inner circumferential surface of a case; and a rotor disposed inside the stator. The rotary electric machine also comprises: a flow passage that is formed in the case and through which flows a refrigerant for cooling the stator from the outside; and a wall section that constitutes an end portion of the case and faces an end surface of the rotor. The rotary electric machine further comprises: a refrigerant path that is formed in the wall section and through which circulates the refrigerant sent from the flow passage; and a fan that rotates together with the rotor and blows a gas inside the case toward the wall section.

Description

rotating electrical machines

[0001] The present invention relates to a rotating electric machine.

[0002] JP2015-012669A discloses a vehicle electric motor equipped with a cooling structure, which cools the internal mechanism by taking in outside air through an air inlet in a casing and releasing it through an exhaust port.

[0003] Such vehicle electric motors take in outside air to cool the internal mechanisms, so there is a risk of moisture entering from the outside, and it has been necessary to strengthen insulation measures.

[0004] The present invention has been made in view of the above problems, and has an object to provide a rotating electric machine capable of cooling the internal mechanism without taking in outside air.

[0005] According to one aspect of the present invention, a rotating electric machine includes a stator fixed to an inner peripheral surface of a case and a rotor disposed inside the stator. The rotating electric machine includes a passage formed in the case through which a coolant flows to cool the stator from the outside, a wall portion forming an end of the case and facing an end face of the rotor, a coolant passage formed in the wall portion through which the coolant sent from the passage flows, and a fan rotating with the rotor to blow gas inside the case toward the wall portion.

[0006] Fig. 1 is a cross-sectional view showing a rotating electric machine according to this embodiment. Fig. 2 is an explanatory diagram showing the flow path of a coolant passage formed in a wall of a case. Fig. 3 is a perspective view showing the wall of the case as viewed from the rotor side. Fig. 4 is a perspective view showing the wall of the case as viewed from the coolant passage side. Fig. 5 is a perspective view showing a rotor disposed inside a stator. Fig. 6 is a perspective view showing a rotor core as viewed from one end. Fig. 7 is a perspective view showing a rotor core as viewed from the other end.

[0007] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0008] FIG. 1 is a cross-sectional view showing a rotating electric machine 10 according to this embodiment. FIG. 2 is an explanatory diagram showing a flow path 310 of a coolant passage 100 formed in a wall portion 300 of a case 12. FIG. 3 is a perspective view showing the wall portion 300 of the case 12 as viewed from the rotor 14 side. FIG. 4 is a perspective view showing the wall portion 300 of the case 12 as viewed from the coolant passage 100 side. FIG. 5 is a perspective view showing the rotor 14 disposed inside a stator 50. FIG. 6 is a perspective view showing the rotor core 16 as viewed from one end. FIG. 7 is a perspective view showing the rotor core 16 as viewed from the other end.

[0009] 1, a rotating electric machine 10 according to this embodiment is mounted on, for example, an electric vehicle as a vehicle. The rotating electric machine 10 constitutes a drive source for driving the vehicle.

[0010] The rotating electric machine 10 functions as an electric motor that supplies driving force during running, moves the vehicle forward when rotating in the forward direction, and also functions as a generator during regenerative braking.

[0011] When the rotating electric machine 10 operates at high speed and high output, copper loss, iron loss, etc. increase. As a result, the rotating electric machine 10 becomes hot and requires cooling. The rotating electric machine 10 is capable of cooling the rotor 14 housed in the case 12.

[0012] The rotating electric machine 10 includes a stator 50 fixed to the inner peripheral surface of a case 12, and a rotor 14 disposed inside the stator 50. The rotating electric machine 10 also includes a flow passage 56 formed in the case 12 through which a coolant flows to cool the stator 50 from the outside, and a wall portion 300 that forms an end of the case 12 and faces the end face of the rotor 14. The coolant is composed of cooling water, but may be composed of other liquids.

[0013] The rotating electric machine 10 also includes a refrigerant passage 100 formed in the wall portion 300 through which the refrigerant sent from the flow passage 56 flows, and a fan 30 (see FIGS. 6 and 7 ) that rotates together with the rotor 14 and blows the gas in the case 12 toward the wall portion 300. The gas is constituted by the air in the case 12, but may also be constituted by another gas sealed in the case 12.

[0014] (Case) The case 12 includes an inner housing 52 having a cylindrical portion 60 surrounding the stator 50, and an outer housing 54 provided on the outer periphery of the cylindrical portion 60 and forming a spiral flow passage 56 between the inner housing 52 and the cylindrical portion 60.

[0015] A cover 62 that closes the end opening of the cylindrical portion 60 is attached to one end 60A of the cylindrical portion 60 of the inner housing 52. The inner surface of the cover 62 forms the first surface 40 that faces one end 16A of the rotor core 16. A bearing 66 is attached to the other end 60B of the cylindrical portion 60.

[0016] A circular ring-shaped blocking wall 70 is integrally provided at the other end of the tubular portion 60. The blocking wall 70 is provided on the tubular portion 60 so as to block the end-side opening of the tubular portion 60. The blocking wall 70 is disposed at a position that is set back toward the tubular portion one end 60A side from the tubular portion other end 60B of the tubular portion 60. As a result, the tubular portion 60 is formed with an extension portion 72 that extends toward the other end side beyond the blocking wall 70, and the extension portion 72 is formed to be thicker than the tubular portion 60.

[0017] A step portion 74 that is recessed toward the cylindrical portion one end 60A is formed in the center of the closing wall 70. The step portion 74 of the closing wall 70 constitutes the second surface 44 that faces the other end 16B of the rotor core 16. An insertion hole 76 opens in the center of the step portion 74 of the closing wall 70.

[0018] The outer peripheral surface of the cylindrical stator 50 described above is disposed in close contact with the inner surface of the tubular portion 60. The stator 50, which is in close contact with the tubular portion 60, is cooled by the refrigerant flowing through the flow passage 56. The tubular portion 60 of the inner housing 52 and the stator 50 are fixed together by, for example, shrink fitting, in which the stator 50 is fitted into the heated and expanded tubular portion 60.

[0019] A pair of grooves 80 are formed in a spiral shape on the outer surface of the tubular portion 60. These grooves 80 form the aforementioned communication passage 56 in a spiral shape along the outer peripheral surface of the tubular portion 60 between the inner housing 52 and the outer housing 54.

[0020] The flow path 56 has an outward path 82 through which the refrigerant supplied from upstream flows from the one end 60A side of the tubular portion 60 toward the blocking wall 70 on the other end 60B side of the tubular portion 60, and a return path 84 through which the refrigerant flows from the other end 60B side of the tubular portion on the blocking wall 70 side toward the one end 60A side of the tubular portion.

[0021] (Bearing Portion) The bearing portion 66 has a protruding portion 90 that protrudes toward the closing wall 70 side of the inner housing 52. The protruding portion 90 fits internally into a cylindrical extending portion 72 that is formed on the other end 60B side of the cylindrical portion 60 of the inner housing 52. The protruding portion 90 has an internal fitting portion 90A that fits internally into the extending portion 72, and a circular ring portion 90B that extends from the internal fitting portion 90A toward the center.

[0022] The ring portion 90B of the protruding portion 90 of the bearing portion 66 faces the closing wall 70 of the inner housing 52. The opposing ring portion 90B and the closing wall 70 form the wall portion 300. The wall portion 300 is formed by including the closing wall 70 provided at the end of the cylindrical portion 60 of the inner housing 52.

[0023] A cylindrical portion 92 extends from the inner edge of the ring portion 90B. The cylindrical portion 92 communicates with the insertion hole 76 of the closing wall 70. The shaft 14A of the rotor 14, which has passed through the insertion hole 76 of the closing wall 70, is inserted into the cylindrical portion 92.

[0024] A coolant passage 100 is formed on the outer periphery of the cylindrical portion 92 by a space formed between the blocking wall 70 and the ring portion 90 B of the protruding portion 90 of the bearing portion 66 .

[0025] As a result, the refrigerant passage 100 is formed in a wall portion 300 that is configured by the ring portion 90B and the blocking wall 70. The wall portion 300 is formed in a circular shape, and an opening for inserting the shaft 14A is formed in the center, thereby forming the wall portion 300 in a ring shape.

[0026] 2 is an explanatory diagram for explaining the refrigerant path 100, and in order to facilitate understanding of the flow of the refrigerant, Fig. 2 schematically illustrates the shape of a flow path 310 of the refrigerant path 100 through which the refrigerant flows. The flow path 310 of the refrigerant path 100 is formed by a wall formed in the ring portion 90B, for example.

[0027] The refrigerant passage 100, which is formed in a circular ring shape, includes a flow path 310 that extends along the periphery of the blocking wall 70. The flow path 310 that constitutes the refrigerant passage 100 is configured to include an arc-shaped inner flow path 312 and an arc-shaped outer flow path 314 that is arranged outside the inner flow path 312. The inner flow path 312 and the outer flow path 314 are formed in a C-shape that extends circumferentially about the central axis C.

[0028] The outer flow path 314 is configured to include an upstream flow path 316 and a downstream flow path 318. The upstream flow path 316 and the downstream flow path 318 are formed in an arc shape and extend on the same circumference centered on the central axis C.

[0029] The upstream end of an upstream flow path 316 that constitutes the outer flow path 314 is connected to a refrigerant supply port 320 formed at the end of the outgoing path 82 that constitutes the communication flow path 56. In addition, the downstream end of the upstream flow path 316 is connected to the upstream end of the inner flow path 312 via a first connection path 322.

[0030] The downstream end of the inner flow path 312 is connected to the upstream end of a downstream flow path 318 that constitutes the outer flow path 314 via a second connection path 324. The downstream end of the downstream flow path 318 is connected to a refrigerant recovery port 326 that is formed at the end of the return path 84 that constitutes the communication path 56.

[0031] The connection between the upstream end of the upstream flow path 316 and the outward path 82 of the flow path 56, or the connection between the downstream end of the downstream flow path 318 and the return path 84 of the flow path 56, is made by a pair of communication passages 102 (see Figure 1; only one communication passage 102 is shown in Figure 1) formed in the inner housing 52 described above.

[0032] The coolant is supplied to the coolant path 100 from the outward path 82 that constitutes the flow path 56. The coolant that has passed through the coolant path 100 is discharged to the return path 84 that constitutes the flow path 56. The coolant discharged from the return path 84 is sent to a radiator (not shown) by a pump (not shown). The coolant in the radiator cools an inverter (not shown) that controls the rotating electric machine 10, and then returns to the outward path 82 that constitutes the flow path 56.

[0033] 1, a first fin 46 is integrally formed on the second surface 44 of the step portion 74 of the blocking wall 70 on the rotor core 16 side. As a result, the wall portion 300, which is formed by the blocking wall 70 of the inner housing 52 and the ring portion 90B of the bearing portion 66 and in which the refrigerant passage 100 is formed, is provided with the first fin 46 that protrudes toward the rotor 14 (see FIG. 1).

[0034] 3, the first fin 46 includes intermittent fins 110 and continuous fins 112, which are formed concentrically on a circle centered on the central axis C of the rotor 14 (see FIG. 1). The continuous fins 112 are arranged on the outer periphery of the intermittent fins 110.

[0035] The intermittent fin 110 is composed of an inner intermittent fin 190 and an outer intermittent fin 192 formed on two concentric circles with different radii. The inner intermittent fin 190 is disposed closer to the central axis C than the outer intermittent fin 192.

[0036] The fin pieces 196 constituting the inner discontinuous fin 190 extend outward in the forward rotation direction CW of the rotor 14 (see FIG. 1 ) as viewed in the axial direction. The fin pieces 198 constituting the outer discontinuous fin 192 extend outward in the forward rotation direction CW as viewed in the axial direction.

[0037] The gaps 200 between the fin pieces 196 of the inner intermittent fin 190 and the gaps 202 between the fin pieces 198 of the outer intermittent fin 192 may be arranged with a shift in position in the circumferential direction CD.

[0038] The longitudinal lengths of the fin pieces 196, 198 of each interrupted fin 190, 192 are approximately the same. The heights of the interrupted fins 190, 192 and the continuous fin 112 are approximately the same, but the heights of the fins (190, 192, 112) located radially outward may be greater.

[0039] 1 and 4 , a second fin 330 is integrally formed on the surface of the protruding portion 90 of the bearing portion 66 facing the ring portion 90B at the step portion 74 of the blocking wall 70. As a result, the wall portion 300 formed by the blocking wall 70 of the inner housing 52 and the ring portion 90B of the bearing portion 66 is provided with the second fin 330 that protrudes into the refrigerant passage 100.

[0040] 4, the second fin 330 includes back intermittent fins 340 formed intermittently and back continuous fins 342 formed continuously on a concentric circle centered on the central axis C of the rotor 14 (see FIG. 1). The back continuous fins 342 are arranged on the outer periphery of the back intermittent fins 340.

[0041] The back intermittent fin 340 is composed of a second inner intermittent fin 350 and a second outer intermittent fin 352 formed on two concentric circles with different radii. The second inner intermittent fin 350 is disposed closer to the central axis C than the second outer intermittent fin 352.

[0042] The fin piece 356 constituting the second inner discontinuous fin 350 is disposed directly behind the fin piece 196 constituting the inner discontinuous fin 190 (see FIG. 3). The fin piece 358 constituting the second outer discontinuous fin 352 is disposed directly behind the fin piece 198 constituting the outer discontinuous fin 192 (see FIG. 3). As a result, the second fin 330 is disposed on the rear side of the first fin 46. Furthermore, the rear continuous fin 342 is disposed directly behind the continuous fin 112 (see FIG. 3).

[0043] 1, the cover 62 has a protrusion 134 disposed inside a coil end 132 that protrudes in the axial direction AD from the coil 130 of the stator 50. A through hole 136 that penetrates the cover 62 is formed in the center of the protrusion 134. The shaft 14A of the rotor 14 is inserted into the through hole 136 via a bearing.

[0044] 5, the stator 50 is formed in a cylindrical shape. The stator 50 is formed with a plurality of teeth 150 extending toward the central axis C. A coil 130 is wound around each tooth 150.

[0045] (Rotor) The rotor core 16 of the rotor 14 is formed in a cylindrical shape and is disposed within the stator 50. A gap (air gap) is formed between an outer peripheral surface 160 of the rotor core 16 and an inner peripheral surface 162 of the stator 50, and this gap forms a second passage 28 that connects the first space 20 on one end 16A (see FIG. 1 ) of the rotor core 16 with the second space 22 on the other end 16B.

[0046] A shaft insertion hole 166, through which the shaft 14A (see FIG. 1) is inserted, is formed in the center of the rotor core 16. A plurality of openings penetrating in the axial direction AD are formed on the outer periphery of the shaft insertion hole 166, and these openings form a first passage 26 in the rotor core 16 that connects the first space 20 on one end 16A (see FIG. 1) side of the rotor core 16 with the second space 22 on the other end 16B side.

[0047] A plurality of accommodating holes 168 are formed radially outward of each first passage 26 and on the periphery of the rotor core 16. A permanent magnet is disposed in each accommodating hole 168. The permanent magnet housed in each accommodating hole 168 receives magnetic force from the excitation-controlled teeth 150, causing the rotor 14 to rotate.

[0048] 6, a first fan 170 that constitutes part of the fan 30 is provided at one end 16A of the rotor core 16. The first fan 170 is fixed to the shaft 14A and rotates together with the rotor core 16.

[0049] The first fan 170 is formed in a disk shape with approximately the same diameter as the rotor core 16. A first ring-shaped opening 172 formed in the first fan 170 has a plurality of first blades 174 arranged in the circumferential direction CD. The first fan 170 is a mixed flow fan in which the first blades 174 are inclined so as to guide the gas in the first space 20 (see FIG. 1 ) to the first passage 26 (see FIG. 1 ) when the rotor core 16 rotates in the forward rotation direction CW.

[0050] 7, a second fan 180 that constitutes part of the fan 30 is provided at the other end 16B of the rotor core 16. The second fan 180 is fixed to the shaft 14A and rotates together with the rotor core 16.

[0051] The second fan 180 is formed in a disk shape with approximately the same diameter as the rotor core 16. A second ring-shaped opening 182 formed in the second fan 180 has a plurality of second blades 184 arranged in the circumferential direction CD. The second fan 180 is a mixed flow fan that discharges gas from the first passage 26 (see FIG. 1 ) into the second space 22 (see FIG. 1 ) when the rotor core 16 rotates in the forward rotation direction CW.

[0052] Furthermore, the second fan 180 blows gas discharged from the first passage 26 (see FIG. 1) to the second space 22 (see FIG. 1) when the rotor core 16 rotates in the forward rotation direction CW, toward the first fins 46 formed integrally with the stepped portions 74 (see FIG. 1) of the blocking wall 70 (see FIG. 1). The gas from the second fan 180 is blown toward the inside of the inner intermittent fins 190 (see FIG. 3).

[0053] In this embodiment, the fan 30 is described as being composed of the first fan 170 and the second fan 180, but the fan 30 is not limited to this configuration. The fan 30 may be composed of, for example, only the first fan 170 or only the second fan 180.

[0054] 3, the gas blown onto the inside of the inner discontinuous fins 190 passes through gaps 200 between the fin pieces 196 of the inner discontinuous fins 190 and is sent to the inner periphery of the outer discontinuous fins 192. The gas sent to the inner periphery of the outer discontinuous fins 192 passes through gaps 202 between the fin pieces 198 of the outer discontinuous fins 192 and is sent to the inner periphery of the continuous fins 112. The gas sent to the inner periphery of the continuous fins 112 is prevented from spreading outward and is sent to the second passages 28 (see FIG. 1).

[0055] (Operations and Effects) The rotating electric machine 10 of this embodiment includes a stator 50 fixed to the inner circumferential surface of the case 12, and a rotor 14 disposed inside the stator 50. The rotating electric machine 10 includes a flow passage 56 formed in the case 12 and through which a refrigerant flows to cool the stator 50 from the outside, and a wall portion 300 that forms an end of the case 12 and faces an end face of the rotor 14. The rotating electric machine 10 includes a refrigerant passage 100 formed in the wall portion 300 and through which the refrigerant sent from the flow passage 56 flows, and a fan 30 that rotates together with the rotor 14 and blows gas inside the case 12 toward the wall portion 300.

[0056] In this configuration, the stator 50 of the rotating electrical machine 10 is cooled by the refrigerant flowing through the flow passage 56 of the case 12. Furthermore, the gas inside the case 12 that is blown toward the wall portion 300 by the fan 30 is cooled by the refrigerant flowing through the refrigerant passage 100 formed in the wall portion 300. The inside of the case 12 is then cooled by the gas cooled by the refrigerant in the refrigerant passage 100.

[0057] Therefore, the rotating electrical machine 10 can efficiently cool the internal mechanism without taking in outside air.

[0058] The refrigerant flowing through the flow passage 56 is used as the refrigerant in the refrigerant passage 100 that cools the gas inside the case 12. This allows the refrigerant in the flow passage 56 to be effectively used for cooling the stator 50.

[0059] The rotating electric machine 10 also includes a first passage 26 formed in the rotor core 16 of the rotor 14, which connects a first space 20 at one end of the rotor core 16 to a second space 22 at the other end within the case 12. The rotating electric machine 10 also includes a second passage 28 formed between the outer peripheral surface of the rotor core 16 and the inner peripheral surface of the stator 50, which connects the first space 20 to the second space 22.

[0060] In this configuration, the gas cooled by the refrigerant in the refrigerant path 100 circulates in the order of the second passage 28, the first space 20, the first passage 26, and the second space 22, thereby enabling the internal mechanism to be cooled more efficiently.

[0061] In the rotating electrical machine 10 , the wall portion 300 is circular, and the coolant passage 100 is a flow path 310 that extends along the periphery of the wall portion 300 .

[0062] In this configuration, the flow path 310 of the coolant passage 100 extends along the periphery of the wall portion 300, thereby increasing the residence time of the coolant within the coolant passage 100. This allows the rotating electrical machine 10 to enhance the cooling effect of the coolant.

[0063] In the rotating electric machine 10 , the coolant passage 100 includes an arc-shaped inner flow passage 312 and an arc-shaped outer flow passage 314 arranged outside the inner flow passage 312 .

[0064] In this configuration, the coolant passage 100 can extend the flow path of the coolant by the inner flow passage 312 and the outer flow passage 314 extending in the circumferential direction CD. This allows the rotating electric machine 10 to extend the residence time of the coolant in the coolant passage 100, thereby further enhancing the cooling effect of the coolant.

[0065] In the rotating electric machine 10, the outer flow passage 314 includes an upstream flow passage 316 and a downstream flow passage 318. A refrigerant supply port 320 of the flow passage 56 is connected to the upstream end of the upstream flow passage 316, and the downstream end of the upstream flow passage 316 is connected to the upstream end of the inner flow passage 312. The downstream end of the inner flow passage 312 is connected to the upstream end of the downstream flow passage 318, and the downstream end of the downstream flow passage 318 is connected to a refrigerant recovery port 326 of the flow passage 56.

[0066] In this configuration, the upstream flow path 316 of the outer flow path 314 extending in the circumferential direction CD, the inner flow path 312, and the downstream flow path 31 of the outer flow path 314 are connected in a zigzag manner, thereby making it possible to further extend the residence time of the refrigerant in the refrigerant path 100.

[0067] Furthermore, in the rotating electrical machine 10 , the blocking wall 70 includes a first fin 46 that protrudes toward the rotor 14 .

[0068] In this configuration, the gas from the fan 30 is blown toward the wall portion 300 having the first fins 46, and the heat of the gas is transferred to the refrigerant in the refrigerant path 100 via the first fins 46. Therefore, the rotating electrical machine 10 can have a higher cooling efficiency than when the gas from the fan 30 is blown toward the flat wall portion 300.

[0069] In addition, in the rotating electrical machine 10 , the blocking wall 70 includes a second fin 330 that protrudes into the coolant passage 100 .

[0070] In this configuration, the heat transferred to the blocking wall 70 is transferred to the refrigerant in the refrigerant path 100 via the second fin 330 protruding into the refrigerant path 100, thereby making it possible to increase the efficiency of heat transfer between the blocking wall 70 and the refrigerant.

[0071] In addition, in the rotating electric machine 10 , the second fins 330 are disposed on the rear side of the first fins 46 .

[0072] In this configuration, the rotating electric machine 10 is able to improve the efficiency of heat transfer from the rotor 14 side to the refrigerant path 100 side compared to when the first fin 46 and the second fin 330 are positioned at different positions separated by the wall surface.

[0073] In the rotating electric machine 10, the case 12 includes an inner housing 52 having a cylindrical portion 60 that surrounds the stator 50, and an outer housing 54 that is provided on the outer periphery of the cylindrical portion 60 and forms a spiral flow passage 56 between the inner housing 52 and the cylindrical portion 60. The wall portion 300 is configured to include a blocking wall 70 that is provided at the end of the cylindrical portion 60.

[0074] In this configuration, the flow passage 56 through which the refrigerant flows is formed in a spiral shape between the cylindrical portion 60 of the inner housing 52 and the outer housing 54. Therefore, in the rotating electric machine 10, the refrigerant can stay for a longer time compared to when the flow passage 56 is formed linearly in the axial direction AD, and therefore the cooling efficiency of the stator 50 can be improved.

[0075] The above describes the embodiments and various modifications of the present invention, but the above embodiments merely illustrate some of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments.

[0076] In the above-described embodiment, the rotating electric machine 10 is used in an electric vehicle, but the application of the rotating electric machine 10 is not limited to this. The rotating electric machine 10 may be used for other purposes.

Claims

1. A rotating electric machine comprising a stator fixed to the inner peripheral surface of a case and a rotor arranged inside the stator, the rotating electric machine comprising: a passage formed in the case through which a refrigerant flows to cool the stator from the outside; a wall portion constituting the end of the case and facing the end face of the rotor; a refrigerant passage formed in the wall portion through which the refrigerant sent from the passage flows; and a fan that rotates together with the rotor and blows gas inside the case toward the wall portion.

2. A rotating electric machine as claimed in claim 1, further comprising: a first passage formed in the rotor core of the rotor, communicating a first space on one end side of the rotor core with a second space on the other end side within the case; and a second passage formed between the outer peripheral surface of the rotor core and the inner peripheral surface of the stator, communicating the first space with the second space.

3. A rotating electric machine according to claim 2, wherein the wall portion is circular, and the coolant passage is a flow path extending along the periphery of the wall portion.

4. A rotating electric machine according to claim 3, wherein the coolant passage includes an inner arc-shaped passage and an outer arc-shaped passage disposed outside the inner passage.

5. A rotating electric machine according to claim 4, wherein the outer flow path includes an upstream flow path and a downstream flow path, the refrigerant supply port of the flow path is connected to the upstream end of the upstream flow path, the downstream end of the upstream flow path is connected to the upstream end of the inner flow path, the downstream end of the inner flow path is connected to the upstream end of the downstream flow path, and the downstream end of the downstream flow path is connected to the refrigerant recovery port of the flow path.

6. A rotating electric machine according to claim 5, wherein the wall portion is provided with a first fin protruding toward the rotor.

7. A rotating electric machine according to claim 6, wherein the wall portion is provided with a second fin protruding into the coolant passage.

8. A rotating electric machine according to claim 7, wherein the second fin is disposed on the rear side of the first fin.

9. A rotating electric machine according to any one of claims 1 to 8, wherein the case comprises an inner housing having a cylindrical portion surrounding the stator, and an outer housing provided on the outer periphery of the cylindrical portion and forming a spiral flow passage between the cylindrical portion and the inner housing, and the wall portion is configured to include a blocking wall provided at the end of the cylindrical portion.

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