Rotating electric machine and electric wheel

Abstract

To provide a rotary electric machine that can improve cooling performance without impairing reliability in terms of structural strength.SOLUTION: A stator 1 of a rotary electric machine 100 comprises a stator core 17, a coil 19, and at least either one of a connecting line 12 or a connecting wire 13. The coil 19 has a first coil end 10 on one end in an axial direction of the stator core 17 and a second coil end 11 on the other end in the axial direction of the stator core 17. A coolant passage for cooling a rotor 2 and the stator 1 has a coolant inflow port 15, a first annular channel 8 that faces an air gap 3 in the axial direction, a relay channel 18 that is arranged closer to the second coil end 11 and faces the air gap 3 in the axial direction, and a second annular channel 9 that communicates with the relay channel 18 and is arranged displaced with respect to the air gap 3 in a radial direction. The connecting line 12 and the connecting wire 13 of the coil 19 are arranged on the first annular channel 8.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to cooling of a rotating electrical machine. [Background technology]

[0002] In the fields of automobiles and aircraft, motors require cooling of the coils and cores, and cooling structures are provided for this purpose. In recent years, the electrification of automobiles and aircraft has led to the advancement of higher power density in motors, which has created a demand for even greater cooling performance.

[0003] As background art to the present invention, a motor cooling device described in Japanese Patent Laid-Open No. 2001-145302 (Patent Document 1) is known. The motor cooling device in Patent Document 1 is provided with an annular oil jacket that communicates with both ends of the motor stator, and an axial coolant flow path is formed within the stator slot, directly liquid-cooling the stator windings (see Abstract). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-145302 Summary of the Invention [Problem to be solved by the invention]

[0005] The following problems exist regarding heat dissipation from windings in the stator of a rotating electrical machine.

[0006] For example, in an inner rotor type rotating electric machine, when a rectangular wire is used for winding, the connecting wires connecting the wound coil to external devices such as an inverter must be drawn outside the motor. In the case of a direct liquid-cooled rotating electric machine, increasing the flow velocity and improving the heat transfer coefficient are effective ways to improve cooling performance. However, when a high-speed liquid refrigerant is applied to the connecting wires, flow vibrations occur due to unsteady fluid forces, which can cause problems with structural strength. This is because the coil ends are tightly wound around the stator core and are generally firmly fixed and supported with varnish, while the connecting wires do not have such support.

[0007] As described above, increasing the refrigerant flow velocity to improve cooling performance can cause problems with structural reliability, while reducing the refrigerant flow velocity to suppress flow vibrations makes it impossible to improve cooling performance. As a result, with conventional structures, it is difficult to ensure both structural reliability and improved cooling performance.

[0008] The motor cooling device of Patent Document 1 is designed to improve cooling performance by direct liquid cooling. The present invention proposes a rotating electrical machine that can further improve cooling performance without reducing reliability when the refrigerant flow rate is increased to further improve cooling performance.

[0009] That is, an object of the present invention is to provide a rotating electrical machine that can improve cooling performance without impairing reliability in terms of structural strength. [Means for solving the problem]

[0010] In order to achieve the above object, the present invention is configured as follows.

[0011] A rotating electric machine comprising: a rotor; a stator facing the rotor with a predetermined air gap therebetween; a flow path through which a coolant flows for cooling the rotor and the stator; and a cooling jacket provided on the outer periphery of the stator, enclosing the stator and having a coolant flow path therein, the stator comprises a stator core having a plurality of slots along a circumferential direction, a plurality of coils disposed in the slots and arranged along the circumferential direction of the stator core, and at least one of connection wires connecting an external device to the coils and crossover wires connecting the coils adjacent in the circumferential direction, the coil has a first coil end that protrudes from the slot at one axial end of the stator core, and a second coil end that protrudes from the slot at the other axial end of the stator core, the flow path includes a refrigerant inlet located on the first coil end side, a first annular flow path that communicates with the refrigerant inlet, extends in the circumferential direction, and faces the air gap in the axial direction, a relay flow path that is located on the second coil end side and faces the air gap in the axial direction, and a second annular flow path that communicates with the relay flow path, extends in the circumferential direction, and is positioned offset radially outward from the air gap, the connecting wire or the crossover wire of the coil is disposed in the first annular flow path, a refrigerant inlet to the second annular flow path is provided at one location in the circumferential direction, an inlet of the refrigerant flow path formed in the cooling jacket is provided on the radially opposite side of the rotation axis of the rotor with respect to the refrigerant inlet to the second annular flow path, the coolant flows through the flow path in the order of the coolant inlet, the first annular flow path, the air gap, the relay flow path, and the second annular flow path, thereby cooling the rotor and the stator; The refrigerant that has flowed into the second annular flow path flows halfway around the circumference, and then flows into the refrigerant flow path of the cooling jacket from the inlet. ,before After making a half turn in the circumferential direction of the refrigerant flow passage, the refrigerant flows out of the rotating electrical machine. The aforementioned A flow path is formed. [Effects of the Invention]

[0012] According to the present invention, flow vibrations can be suppressed without reducing the cooling performance of the connection wire side coil end, and the cooling performance can be improved by increasing the refrigerant flow rate at the non-connection wire side coil end, thereby achieving both improved structural reliability and improved cooling performance.

[0013] Problems, configurations, and effects other than those described above will become apparent from the following description of the embodiments. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a cross-sectional view of a rotating electric machine according to a first embodiment of the present invention. [Figure 2] 1 is a perspective view of a stator core and a wound coil of a rotating electric machine to which the present invention is applied, viewed from the connecting wire side; [Figure 3] FIG. 2 is an explanatory diagram of the flow of a refrigerant according to the first embodiment of the present invention. [Figure 4] FIG. 10 is a cross-sectional view showing a part of a rotating electric machine according to a third embodiment of the present invention. [Figure 5] FIG. 1 is a perspective view showing the appearance of an outer rotor type electric wheel 1000 according to the present invention. [Figure 6] 6 is an exploded view showing the electric wheel 1000 of FIG. 5 separated along the rotation axis. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the rotating electric machine according to the present invention will be described with reference to the drawings. The same reference numerals are used to designate components common to the various figures or embodiments, and duplicated explanations will be omitted. In addition, when there are differences among the common components designated by the same reference numerals, they will be explained separately.

[0016] [Example 1] (Configuration of rotating electric machine) 1 is a cross-sectional view of a rotating electric machine 100 according to a first embodiment of the present invention. It is a perspective view of a stator core 17 and a wound coil 19 of the rotating electric machine 100 to which the present invention is applied, as viewed from the connecting wire 12 side.

[0017] A rotating electrical machine 100 to which the first embodiment is applied will be described with reference to FIGS.

[0018] 1 shows an inner rotor type rotating electric machine 100 in which a stator 1 is arranged on the outer diameter side of the rotating electric machine and a rotor 2 having permanent magnets 4 is arranged on the inner diameter side. The stator 1 and rotor 2 face each other in the radial direction of the rotating electric machine 100 via an air gap 3. In the rotating electric machine 100 of this embodiment, a bracket that houses the stator 1 and rotor 2 is composed of housings 7a and 7b, end plates 22a and 22b, and a cooling jacket 14.

[0019] The rotor 2 has a shaft 5 that serves as a rotation axis, and a plurality of permanent magnets 4 are arranged circumferentially. The rotor 2 is rotatably supported by bearings 6 that are held by a first end plate 22a and a second end plate 22b. In the following description, the direction along the rotation axis of the shaft 5 will be referred to as the "axial direction."

[0020] The stator core 17 is provided with a plurality of teeth 17c that protrude radially inward, and slots 17d are formed between two adjacent teeth 17c. Coils 19 are wound around the plurality of slots 17d. The coils 19 wound around the stator core 17 have connection wires 12 at one axial end (end face 17a) of the stator core 17 for connection to an external device (not shown), such as an inverter. The coil end 10 on the side where the connection wires 12 are arranged is covered by the housing 7a, forming a first annular flow path 8 that extends circumferentially around the stator core 17. Hereinafter, the coil end 10 on the side where the connection wires 12 are arranged (the side of the end face 17a of the stator core 17) will be referred to as the "first coil end," and the coil end 11 on the opposite side from the side where the connection wires 12 are arranged (the side of the end face 17b of the stator core 17) will be referred to as the "second coil end."

[0021] The first annular flow path 8 extends radially inward (toward the inner diameter side) of the air gap 3, and the first annular flow path 8 and the air gap 3 are formed to face each other in the axial direction. That is, one axial end side (first coil end 10 side) of the air gap 3 is connected to the first annular flow path 8, and the air gap 3 is in communication with the first annular flow path 8.

[0022] At the other axial end of stator core 17, a second annular flow passage 9 is formed by housing 7b so as to cover second coil ends 11. The second annular flow passage is formed to be shifted radially outward (toward the outer diameter side) from air gap 3.

[0023] A relay flow path 18 is formed on the other end side of stator core 17 at a position axially opposing air gap 3, and this relay flow path 18 is connected to second annular flow path 9 over at least a portion of the circumferential direction. That is, refrigerant flow path 18 is formed between second end plate 22b and rotor 2, and this refrigerant flow path 18 serves as a relay flow path, connecting the other axial end side (second coil end 11 side) of air gap 3 to second annular flow path 9, so that air gap 3 communicates with second annular flow path 9. To connect relay flow path 18 to second annular flow path 9, a communication hole is provided in housing 7b as connection portion 20 over at least a portion of the circumferential direction.

[0024] (Refrigerant flow in rotating electrical machines) Next, the flow of the refrigerant in this embodiment will be shown with reference to FIG.

[0025] Fig. 3 is an explanatory diagram of the flow of the refrigerant according to the first embodiment of the present invention. Fig. 3 shows an enlarged view of the upper part (part IIIa) and the lower part (part IIIb) of Fig. 1, and the arrows in the figure indicate the flow of the refrigerant.

[0026] The coolant flows into the first annular flow path 8 of the rotating electrical machine from the coolant inlet 15. The coolant that flows into the first annular flow path 8 expands in the circumferential direction and flows into the air gaps 3 from the entire periphery of the air gaps 3 that are opposed in the axial direction. That is, in this embodiment, the air gaps 3 serve as a flow path through which the coolant flows.

[0027] The coolant that has flowed into the air gap 3 flows into the relay flow passage 18 and then flows from the connection portion 20 radially outward into the second annular flow passage 9.

[0028] The rotating electric machine 100 of this embodiment is provided with a cooling jacket 14 on the outer periphery of the stator 1, which contains the stator 1 and has a flow path through which a refrigerant flows. The connection portion 20 is provided at one location in the circumferential direction (at the top in FIG. 3), and the refrigerant that flows into the second annular flow path 9 flows halfway around the circumferential direction before flowing into the cooling jacket 14 from the bottom. The inlet of the cooling jacket 14 through which the refrigerant flows into the cooling jacket 14 is provided at one location in the circumferential direction (at the bottom in FIG. 3). The refrigerant in the cooling jacket 14 flows halfway around the circumferential direction, returns to the top, and then flows out of the rotating electric machine 100 from the refrigerant outlet 16b.

[0029] That is, in the rotating electrical machine 100 of this embodiment, the refrigerant inlet (connection portion) to the second annular flow passage 9 20 On the other hand, the inlet 16a of the refrigerant flow passage 16 formed in the cooling jacket 14 is a refrigerant inlet to the second annular flow passage 9. 20 The second annular flow path 9 is provided on the radially opposite side of the rotation axis of the rotor 2. The flow path is configured such that the refrigerant that flows into the second annular flow path 9 flows halfway around in the circumferential direction, then flows into the refrigerant flow path 16 of the cooling jacket 14 from the inlet 16a, and flows halfway around the refrigerant flow path 16 of the cooling jacket 14 in the circumferential direction before flowing out of the rotating electric machine 100.

[0030] In this embodiment, the outer periphery of the housing 7b is structured to double as a cooling jacket. The cooling jacket 14 is not essential, but is provided to enhance the cooling effect of the coil 19 by cooling the stator core 17 from its outer periphery, and it goes without saying that the present invention can be applied even if the cooling jacket 14 is not provided.

[0031] According to this embodiment, the refrigerant flows axially from the entire circumference of the air gap 3, allowing for a large opening area of the air gap 3, which serves as a refrigerant flow path. As a result, the refrigerant flows separately into the first annular flow path 8 and the air gap 3, reducing the flow velocity of the refrigerant flowing through the first annular flow path 8. This reduces flow vibrations in the connecting wire 12 caused by unsteady fluid forces, ensuring reliable structural strength. Furthermore, by allowing low-temperature refrigerant to flow first through the first annular flow path 8, a decrease in cooling performance for the first coil end 10 can be suppressed.

[0032] Meanwhile, in the second annular flow path 9 where the connecting wires 12 are not arranged, all of the refrigerant that has been diverted to the first annular flow path 8 and the air gap 3 is made to flow in the circumferential direction, thereby increasing the refrigerant flow velocity and the heat transfer coefficient, thereby improving the cooling performance of the second coil ends 11. Furthermore, the second coil ends 11 are securely wound around the stator core 17 and are generally fixed with varnish or the like, so there is no need to worry about flow vibrations.

[0033] As a result, flow vibrations are suppressed without reducing the cooling performance of the connection wire side coil end (first coil end) 10 on the connection wire 12 side, and the refrigerant flow rate is increased on the anti-connection wire side coil end (second coil end) 11 on the opposite side from the connection wire 12 side, improving the cooling performance, thereby achieving both improved structural reliability and improved cooling performance.

[0034] Note that fastening the connecting wire 12 with a string-like insulating member or further fixing it with varnish to strengthen the fixing support is not desirable because it would result in covering the surface of the connecting wire 12 with an insulating material with poor thermal conductivity, leading to a decrease in cooling performance. In this embodiment, the flow velocity of the refrigerant flowing through the first annular flow path 8 is reduced, thereby suppressing flow vibration of the connecting wire 12, so it is possible to avoid providing a fixing structure such as fastening the connecting wire 12 with a string-like insulating member or fixing it with varnish.

[0035] [Example 2] In the first embodiment, a structure for suppressing the occurrence of flow vibrations in the connection wire 12 is exemplified.

[0036] In addition to the connecting wire 12, the crossover wire 13 connecting adjacent coils is also a part with relatively weak fixed support, and by using a method similar to that for the connecting wire 12 shown in Example 1, it is possible to ensure both reliability and improve cooling performance.

[0037] That is, the stator core 17 has a crossover wire 13 connecting adjacent coils 19, a first coil end 10 at one axial end of the stator core 17 where the crossover wire 13 is arranged, and a second coil end 11 at the other end of the stator core 17. The refrigerant flow path is formed with a refrigerant inlet 15 arranged on the first coil end 10 side, a first annular flow path 8 connected to the refrigerant inlet 15 and axially facing approximately the entire circumference of the air gap 3, a relay flow path 18 arranged on the second coil end 11 side and axially facing the air gap 3, and a second annular flow path 9 connected to the relay flow path 18 and arranged radially offset from the air gap 3 on the stator 1.

[0038] The flow of the refrigerant is the same as in the first embodiment except that the connecting wire 12 is replaced with the crossover wire 13, and therefore a description thereof will be omitted.

[0039] With the above-described structure, flow vibrations are suppressed without reducing the cooling performance of the crossover side coil end 10, and the cooling performance is improved by increasing the refrigerant flow rate in the non-crossover side coil end 11, thereby achieving both improved structural reliability and improved cooling performance.

[0040] That is, the rotating electric machine 100 of the first and second embodiments has the following configuration.

[0041] The rotating electric machine 100 includes a rotor 2, a stator 1 facing the rotor 2 across a predetermined air gap 3, and a flow path (coolant flow path) through which a coolant flows to cool the rotor 2 and the stator 1. The stator 1 includes a stator core 17 having a plurality of slots 17d along the circumferential direction, a plurality of coils 19 disposed in the slots 17d and arranged along the circumferential direction of the stator core 17, and at least one of connection wires 12 connecting an external device to the coils 19 and crossover wires 13 connecting adjacent coils 19 in the circumferential direction. The coils 19 have first coil ends 10 that protrude from the slots 17d at one axial end of the stator core 17 and second coil ends 11 that protrude from the slots 17d at the other axial end of the stator core 17. The flow path has a refrigerant inlet 15 located on the side of the first coil end 10, a first annular flow path 8 that communicates with the refrigerant inlet 15, extends circumferentially, and faces the air gap 3 in the axial direction, a relay flow path 18 located on the side of the second coil end 11, and faces the air gap 3 in the axial direction, and a second annular flow path 9 that communicates with the relay flow path 18, extends circumferentially, and is positioned radially outward relative to the air gap 3. The connecting wires 12 or crossover wires 13 of the coil 19 are located in the first annular flow path 8.

[0042] In this case, the coolant flows through the flow path in the order of coolant inlet 15, first annular flow path 8, air gap 3, relay flow path 18, and second annular flow path 9, thereby cooling rotor 2 and stator 1.

[0043] Here, it is preferable that the first annular flow path 8 and the relay flow path 18 are connected to the air gap 3 so as to face the air gap 3 in the axial direction around the entire circumference of the air gap 3. This allows the refrigerant to smoothly flow into the air gap 3, and the flow velocity of the refrigerant flowing through the first annular flow path 8 can be effectively reduced.

[0044] Generally, the crossover wire 13 and the connecting wire 12 are not necessarily arranged on the same axial side of the stator core 17, but it is desirable to arrange them on the same side. That is, the coil 19 has both the connecting wire 12 and the crossover wire 13, and it is desirable that the connecting wire 12 and the crossover wire 13 are arranged in the first annular flow path 8. This makes it possible to simultaneously satisfy the structures of Examples 1 and 2, and ensure the reliability of the structural strength of both the crossover wire 13 and the connecting wire 12.

[0045] [Example 3] Fig. 4 is a cross-sectional view showing a part of a rotating electric machine 100 according to a third embodiment of the present invention. Fig. 4 shows an enlarged view of a part corresponding to the upper part (part IIIa) of Fig. 1 according to the first embodiment, and arrows in the figure indicate the flow of the refrigerant.

[0046] 4, a baffle plate 21 for deflecting the refrigerant flow in the circumferential direction is disposed on the outlet side of the refrigerant inlet 15. That is, the rotating electric machine 100 of this embodiment has a baffle plate 21 for deflecting the refrigerant flow in the circumferential direction at the outlet portion of the refrigerant inlet 15 to the first annular flow path 8. This prevents the fast flow of refrigerant from the refrigerant inlet 15 from directly hitting the connecting wires 12 and the crossover wires 13.

[0047] 2, connecting wires 12 and crossover wires 13 are spaced apart in the circumferential direction, and so generally, by appropriately shifting the circumferential positions of connecting wires 12 and crossover wires 13 relative to refrigerant inlet 15, it is possible to prevent the flow from refrigerant inlet 15 from directly hitting connecting wires 12 and crossover wires 13. However, even if such an arrangement is not possible due to structural constraints, the structure of this embodiment can suppress flow vibration of connecting wires 12 and crossover wires 13, thereby achieving both improved reliability and improved cooling performance.

[0048] [Example 4] In the above-described embodiments, the refrigerant inlet 15 is provided at one location in the circumferential direction, but it may be provided at multiple locations in the circumferential direction. In other words, it is preferable that multiple refrigerant inlet ports 15 are arranged in the circumferential direction.

[0049] With this structure, the flow velocity of the refrigerant flowing in from the refrigerant inlet 15 can be reduced, and even if the refrigerant directly hits the connecting wire 12 or the crossover wire 13, the occurrence of flow vibration can be suppressed.

[0050] Furthermore, when there is only one refrigerant inlet 15, some circumferential flow velocity occurs when the inflowing refrigerant is distributed in the circumferential direction. However, by providing multiple refrigerant inlets 15, the circumferential flow velocity can be reduced, making it possible to further reduce the possibility of flow vibration in the connecting wires 12 and crossover wires 13.

[0051] The above embodiments are merely examples, and the present invention is not limited to these as long as the features of the invention are not impaired. For example, although the present invention has been described in terms of an inner rotor type rotating electric machine 100, it can also be implemented in an outer rotor type rotating electric machine.

[0052] [Example 5] 5 and 6, an embodiment (fifth embodiment) of the electric wheel 1000 will be described. In this embodiment, an example is shown in which an outer rotor type rotating electric machine 100 is used, and the present invention applied to the inner rotor type rotating electric machine 100 described above is applied to the outer rotor type rotating electric machine 100. Fig. 5 is a diagram according to the present invention, and is a perspective view showing the appearance of an outer rotor type electric wheel 1000. Fig. 6 is an exploded three-dimensional view showing the electric wheel 1000 of Fig. 5 separated on the rotation axis.

[0053] Since xEV drive motors require high torque, it is necessary to pass a large current through coil (motor winding) 19. Coil 19 (see FIG. 1) of this embodiment uses a flat rectangular wire whose cross section has long and short sides, which improves the space factor within the slot and reduces conductor resistance and copper loss.

[0054] The electric wheel 1000 includes a wheel 1020, a rotor assembly 1070, a stator assembly 1080, a power conversion device 770, and a first case portion 401. The rotor assembly 1070 includes a rotor 2, a rotor case 400, and a second case portion 402. The stator assembly 1080 includes a stator 1 and a stator case 500. A disc brake 1110 that generates braking force to brake the wheel is attached to the electric wheel 1000. The electric wheel 1000 is attached to a frame (vehicle frame) that constitutes the vehicle body via a suspension device 1120. The rotating electric machine 100 of this embodiment has improved reliability and cooling performance, and is therefore suitable for use in the electric wheel 1000 as a high-output xEV drive motor.

[0055] In this embodiment, the electric wheel 1000 of an outer rotor type is exemplified, but the rotating electric machine 100 according to the present invention may also be applied to an electric wheel of an inner rotor type.

[0056] Furthermore, the present invention is not limited to the above-described embodiments and includes various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those including all of the configurations. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, or replace part of the configuration of each embodiment with other configurations. [Explanation of symbols]

[0057] 1...stator, 2...rotor, 3...air gap, 4...permanent magnet, 5...shaft, 6...bearing, 7...housing, 8...first annular flow path, 9...second annular flow path, 10...first coil end, 11...second coil end, 12...connecting wire, 13...crossover wire, 14...cooling jacket, 15...refrigerant inlet, 16...refrigerant outlet, 17...stator core, 18...relay flow path, 19...wound coil, 20...connecting portion, 21...baffle plate

Claims

1. A rotating electric machine comprising: a rotor; a stator facing the rotor with a predetermined air gap therebetween; a flow path through which a coolant flows for cooling the rotor and the stator; and a cooling jacket provided on the outer periphery of the stator, enclosing the stator and having a coolant flow path therein, the stator comprises a stator core having a plurality of slots along a circumferential direction, a plurality of coils disposed in the slots and arranged along the circumferential direction of the stator core, and at least one of connection wires connecting an external device to the coils and crossover wires connecting the coils adjacent in the circumferential direction, the coil has a first coil end that protrudes from the slot at one axial end of the stator core, and a second coil end that protrudes from the slot at the other axial end of the stator core, the flow path includes a refrigerant inlet located on the first coil end side, a first annular flow path that communicates with the refrigerant inlet, extends in the circumferential direction, and faces the air gap in the axial direction, a relay flow path that is located on the second coil end side and faces the air gap in the axial direction, and a second annular flow path that communicates with the relay flow path, extends in the circumferential direction, and is positioned offset radially outward from the air gap, the connecting wire or the crossover wire of the coil is disposed in the first annular flow path, a refrigerant inlet to the second annular flow path is provided at one location in the circumferential direction; an inlet of the refrigerant flow path formed in the cooling jacket is provided on the radially opposite side of the rotation axis of the rotor with respect to the refrigerant inlet to the second annular flow path, the coolant flows through the flow path in the order of the coolant inlet, the first annular flow path, the air gap, the relay flow path, and the second annular flow path, thereby cooling the rotor and the stator; A rotating electric machine in which the flow path is configured so that the refrigerant that flows into the second annular flow path flows halfway around the circumference, then flows into the refrigerant flow path of the cooling jacket from the inlet, flows halfway around the refrigerant flow path in the circumferential direction, and then flows out to the outside of the rotating electric machine.

2. 2. The rotating electric machine according to claim 1, the coil has both the connecting wire and the crossover wire, The connecting wire and the crossover wire are disposed in the first annular flow path.

3. 2. The rotating electric machine according to claim 1, The first annular flow path and the relay flow path are connected to the air gap in an axial direction around the entire circumference of the air gap.

4. 2. The rotating electric machine according to claim 1, a baffle plate for deflecting the flow of the coolant in a circumferential direction at an outlet portion of the coolant inlet to the first annular flow passage;

5. 2. The rotating electric machine according to claim 1, The rotating electric machine has a plurality of refrigerant inlets arranged in the circumferential direction.

6. An electric wheel including a wheel, a power conversion device, and a rotating electric machine having a stator and a rotor, wherein the stator is provided on the side of the wheel or on the side of a suspension device that mounts the electric wheel to a vehicle body frame, An electric wheel comprising the rotating electric machine according to any one of claims 1 to 5 as the rotating electric machine.

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