rotating electrical machines

Abstract

Provided is a rotary electrical machine comprising a rotor and stator which is disposed to the radially outward side of the rotor, which is provided with a stator core that is provided with a plurality of coils, and in which coil end parts protrude from an end of the stator core in the axial direction of the stator core, wherein the coil end parts are cooled by a coolant. In the rotary electrical machine, the plurality of coils are wound around the stator core in a helical manner in the radial direction of stator core, coils at the coil end parts form a plurality of arc-shaped coil arches, and a thermal transfer member is provided between each coil arch. Furthermore, the thermal transfer member has a part which protrudes further in the radial direction than the outer perimeter of the coil end parts.

Description

[Technical Field]

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

[0002] JP2020-065377A discloses a rotating electric machine including a rotor, a stator having a coil, a housing that houses the rotor and the stator, and a heat transfer member that dissipates heat from the stator core. In this rotating electric machine, the heat transfer member, one end of which is in contact with the inner wall of the housing, is inserted inside the coil arch, thereby increasing the heat transfer area when cooling oil flows through it and promoting the cooling effect. Summary of the Invention

[0003] However, since there are almost no gaps between the coil arches of the stator coil, it is difficult for the cooling oil (refrigerant) to come into contact with the spaces between the coil arches during cooling, and this area is prone to becoming hot. Even in the rotating electric machine described in JP2020-065377A, it is difficult for the cooling oil to come into contact with the spaces between the coil arches, so there is still a risk that the stator coil cannot be sufficiently cooled.

[0004] The present invention has been made in view of the above-mentioned problems, and has an object to provide a rotating electric machine in which the cooling efficiency of the stator coil is improved.

[0005] According to one aspect of the present invention, there is provided a rotating electric machine including a rotor, a stator core disposed radially outward of the rotor and including a plurality of coils, and a stator having coil end portions projecting from an end of the stator core in the axial direction of the stator core, the coil end portions being cooled by a refrigerant. In this rotating electric machine, a plurality of coils are wound spirally around the stator core in the radial direction of the stator core, the coils in the coil end portions form a plurality of arc-shaped coil arches, and heat transfer members are provided between each coil arch. The heat transfer members have portions projecting radially beyond the outer periphery of the coil end portions. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a schematic diagram showing the main configuration of a rotating electrical machine according to an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic view of the rotating electrical machine as viewed from the axial direction. [Figure 3] FIG. 3 is a partially enlarged view of the coil end portion. [Figure 4] FIG. 4 is a cross-sectional view taken along line AA in FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along line BB in FIG. [Figure 6] FIG. 6 is a diagram illustrating the configuration of the end of the heat transfer member. [Figure 7] FIG. 7 is a schematic configuration diagram of a rotating electric machine according to the second embodiment. [Figure 8] FIG. 8 is a schematic view of the rotating electric machine according to the second embodiment as viewed from the axial direction. [Figure 9] FIG. 9 is a schematic configuration diagram of a rotating electric machine according to the third embodiment. [Figure 10] FIG. 10 is a schematic view of the rotating electric machine according to the third embodiment as viewed from the axial direction. [Figure 11] FIG. 11 is a schematic configuration diagram of a rotating electric machine according to the fourth embodiment. [Figure 12] FIG. 12 is a schematic view of the rotating electric machine according to the fourth embodiment as viewed from the axial direction. DETAILED DESCRIPTION OF THE INVENTION

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

[0008] [First embodiment] 1 is a schematic diagram showing the main configuration of a motor 100 as a rotating electric machine according to an embodiment of the present invention, and is a cross-sectional view of the motor 100. In this embodiment, the motor 100 is described as a drive motor for a vehicle, but the motor 100 may also be used as a drive source for systems other than vehicles.

[0009] 1, the motor 100 includes a rotor 10 including a rotor core 11 and a rotating shaft 12, and a stator 20 including a stator core 21 and coil end portions 22. The motor 100 is accommodated in a housing 30.

[0010] The rotor 10 includes a cylindrical rotor core 11 equipped with a permanent magnet, and a rotating shaft 12 fixed in an insertion hole 11A of the rotor core 11. The rotor 10 is disposed inside the stator 20 so as to be rotatable relative to the stator 20. The rotating shaft 12 is configured as a shaft member protruding from both end faces of the rotor core 11.

[0011] The stator 20 is disposed radially outside the rotor 10 (rotor core 11) and includes a stator core 21 in which a plurality of coils (hereinafter also referred to as stator coils) are disposed. The stator 20 has coil end portions 22 that protrude from the ends of the stator core 21 in the axial direction of the rotating shaft 12 (hereinafter also referred to as the axial direction).

[0012] Stator core 21 is a cylindrical member formed by laminating multiple electromagnetic steel plates, and multiple coils are wound around teeth (not shown) formed inside stator core 21. More specifically, U-phase, V-phase, and W-phase coils are spirally wound around the teeth of stator core 21 in a lap-like pattern in the radial direction of stator core 21. Coil end portions 22, which constitute part of the coils, protrude in the axial direction from both axial ends of stator core 21. When current flows through the coils of stator 20, rotor 10 rotates due to the interaction with permanent magnets provided in rotor core 11.

[0013] The housing 30 is a casing that houses the motor 100 (the rotor 10 and the stator 20) and is made of, for example, aluminum. Within the housing 30, a cooling oil supply passage 31 through which cooling oil flows is formed in a portion located above the motor 100, and a cooling oil discharge passage 32 for discharging the cooling oil is formed in a portion located below the motor 100. The cooling oil supply passage 31 has an inlet 33 above the coil end portions 22 that opens toward the coil end portions 22, and the cooling oil discharge passage 32 has an outlet 34 that opens toward the coil end portions 22. The cooling oil supply passage 31 is connected to an oil pump (not shown) for pumping the cooling oil.

[0014] 2 is a diagram illustrating the flow of cooling oil (refrigerant), and is a view of the motor 100 as seen from the axial direction. Note that in FIG. 2, the rotor 10 is removed.

[0015] When cooling oil is pumped from the oil pump to the cooling oil supply passage 31, the cooling oil is dripped (supplied) from the inlet 33 toward the coil end portion 22, as shown in Fig. 2. The cooling oil dripped onto the coil end portion 22 wets the surface of the coil in the coil end portion 22 due to surface tension, falls downward due to gravity, and is discharged from the outlet 34 into the cooling oil discharge passage 32. This cools the stator coil.

[0016] As described above, in the motor 100, the stator coil is cooled by dripping cooling oil onto the coil end portions 22 to cool the coil end portions 22.

[0017] When multiple coils are wound radially around a stator core, multiple arc-shaped coil arches (hereinafter referred to as coil arches) are formed at the coil end portions. During the motor manufacturing process, the stator coils are typically compressed to eliminate gaps between the coil arches. Therefore, even if cooling oil (refrigerant) is supplied to the coil end portions, it is difficult for the cooling oil (refrigerant) to come into contact with the spaces between the coil arches, causing these areas to become hot, potentially preventing the stator coils from being sufficiently cooled.

[0018] Therefore, in this embodiment, a heat transfer member 40 is sandwiched between each coil arch in the coil end portion 22, with a portion of the heat transfer member 40 protruding radially beyond the outer periphery of the coil end portion 22. As a result, the cooling oil (refrigerant) comes into contact with the portion of the heat transfer member 40 that protrudes radially beyond the outer periphery of the coil end portion 22, and heat at the boundary of the coil arch is carried out of the stator coil via the heat transfer member 40 and cooled by the cooling oil. In other words, the boundary of the coil arch can be cooled effectively, improving the cooling efficiency of the stator coil.

[0019] The cooling structure of the stator coil in the motor 100 will be described in detail below.

[0020] 3 is a partially enlarged view of the coil end portion 22 when viewed in the axial direction of the stator 20. The upper side in FIG. 3 is the inner diameter side of the stator core 21, and the lower side is the outer diameter side.

[0021] A plurality of coil arches 23 are formed in the coil end portion 22 along the cylindrical stator core 21. As shown in Fig. 3, a heat transfer member 40 and insulating paper 50 are sandwiched between adjacent coil arches 23.

[0022] The coil arches 23 are formed by bending a bundle of multiple copper wires that make up the stator coil into an arc. Although only some of the coil arches 23 are shown in Fig. 3, multiple coil arches 23 are formed in the coil end portion 22 to form an annular ring along the axial end face of the cylindrical stator core 21. In this embodiment, the stator coil is wound in a spiral lap shape, and the coil arches 23 are also wound in a spiral shape.

[0023] The heat transfer member 40 and the insulating paper 50 are interposed between adjacent coil arches 23. That is, the multiple coil arches 23 are in contact with adjacent coil arches 23 via the heat transfer member 40 and the insulating paper 50. In the manufacturing process of the motor 100, the coil end portion 22 is compression molded so that there are no gaps between the coil arches 23, with the heat transfer member 40 and the insulating paper 50 inserted axially between the adjacent coil arches 23. In this way, the heat transfer member 40 and the insulating paper 50 are held between the coil arches 23.

[0024] The heat transfer member 40 is a member with high thermal conductivity and is made of the same material as the copper wire that makes up the stator coil. By making the heat transfer member 40 from the same material as the coil, damage to the stator coil by the heat transfer member 40 is prevented during compression molding. In addition, because the heat transfer member 40 and the stator coil have the same linear expansion coefficient, damage to the stator coil by the heat transfer member 40 during high thermal expansion is also prevented.

[0025] Furthermore, the heat transfer member 40 extends parallel to the coil arch 23 from the inner diameter side to the outer diameter side of the coil end portion 22, and protrudes radially beyond the outer periphery of the coil end portion 22. As a result, when cooling oil is supplied to the coil end portion 22, the cooling oil comes into contact with the heat transfer member 40, and the heat at the boundary of the coil arch 23 is carried through the heat transfer member 40 to the outside of the stator coil and is cooled by the cooling oil.

[0026] 4 is a cross-sectional view taken along line AA in FIG. 3, and FIG. 5 is a cross-sectional view taken along line BB in FIG.

[0027] As shown in FIG. 4, the coil arch 23 is made up of a bundle of a plurality of copper wires 231 that form the stator coil, and a heat transfer member 40 and insulating paper 50 are provided between adjacent coil arches 23.

[0028] As shown in FIG. 5 , the heat transfer member 40 is provided parallel to the coil arch (coil) 23 and includes a plurality of straight portions 401 extending between the outer diameter side (right side in FIG. 5 ) and the inner diameter side (left side in FIG. 5 ) of the coil end portion 22, and a plurality of U-turn portions 402 making a U-turn from one end of the straight portions 401. That is, the heat transfer member 40 is formed in a zigzag shape parallel to the coil arch (coil) 23. The heat transfer member 40 also includes a plurality of portions (protruding portions) 41 on the outer diameter side of the coil end portion 22 that protrude radially (to the right side in FIG. 5 ) beyond the outer periphery of the coil end portion 22 (coil arch 23). When cooling oil is supplied to the coil end portion 22, the cooling oil comes into contact with the plurality of protruding portions 41. As will be described later, an end 411 of the heat transfer member 40 is connected to the inner wall of the housing 30.

[0029] In this way, the heat transfer members 40 provided between the coil arches 23 are formed in a zigzag shape parallel to the coil arches (coils) 23, so that the heat at the boundaries of the coil arches 23 is carried out more evenly and without unevenness to the outside of the stator coil by the heat transfer members 40. Therefore, the stator coil can be cooled more efficiently.

[0030] Furthermore, since the heat transfer member 40 has a plurality of protruding portions 41, the surface area of ​​the heat transfer member 40 that comes into contact with the cooling oil increases when the cooling oil is supplied to the coil end portion 22. This further improves the cooling efficiency of the stator coil.

[0031] 5, two heat transfer members 40 are provided for one coil arch 23, but this is not necessarily limited to this. For example, one heat transfer member 40 may be provided for one coil arch 23, or three or more heat transfer members 40 may be provided for one coil arch 23.

[0032] FIG. 6 is a schematic diagram illustrating the configuration of the end 411 of the heat transfer member 40, showing a part of the motor 100 when viewed from the axial direction of the motor 100.

[0033] 6, an end 411 of the heat transfer member 40 is covered and protected by a cover 412 made of an insulating material. The end 411 of the heat transfer member 40 is connected to the inner wall 35 of the housing 30 by a highly thermally conductive adhesive 413. That is, the end 411 of the heat transfer member 40 is connected to the housing 30 via the cover (insulating material) 412. The housing 30 is provided with a water jacket (not shown).

[0034] In this way, because the end 411 of the heat transfer member 40 provided between the coil arches 23 is connected to the inner wall 35 of the housing 30, heat from the boundary of the coil arches 23 is transferred to the housing 30. In other words, the heat from the boundary of the coil arches 23 can be efficiently released to the outside of the motor 100. Furthermore, because the heat transfer member 40 and the housing 30 are connected via a cover (insulating material) 412, insulation between the stator coil, the heat transfer member 40, and the housing 30 is ensured.

[0035] As described above, since the heat transfer members 40 having the protruding portions 41 are provided between the coil arches 23, the heat at the boundaries of the coil arches 23 is transferred through the heat transfer members 40 to the outside of the stator coil and cooled by the cooling oil, thereby improving the cooling efficiency of the stator coil.

[0036] Preferably, the U-phase, V-phase, and W-phase coils wound in a lap pattern around the stator core 21 form coil arches 23 of similar shapes at the coil end portions 22. This allows the same heat transfer member 40 to be used for all the coil arches 23, simplifying the manufacturing process.

[0037] According to the motor (rotating electric machine) 100 of the first embodiment described above, the following effects can be obtained.

[0038] In the motor (rotating electric machine) 100, the coils of the coil end portions 22 form a plurality of arc-shaped coil arches 23, and heat transfer members 40 are provided between each of the coil arches 23. The heat transfer members 40 also have portions (protruding portions) 41 that protrude radially beyond the outer periphery of the coil end portions 22. Therefore, when cooling oil (refrigerant) is supplied to the coil end portions 22, the cooling oil (refrigerant) comes into contact with the portions (protruding portions) 41 of the heat transfer member 40 that protrude radially beyond the outer periphery of the coil end portions 22. As a result, heat from the boundary portions of the coil arches 23 is carried to the outside of the stator coil via the heat transfer member 40 and cooled by the cooling oil. In other words, the boundary portions of the coil arches 23 can be effectively cooled, improving the cooling efficiency of the stator coil.

[0039] In the motor (rotating electric machine) 100, the heat transfer members 40 provided between the coil arches 23 are formed in a zigzag pattern parallel to the coils (coil arches 23). This allows the heat at the boundaries of the coil arches 23 to be carried more evenly and uniformly to the outside of the stator coil by the heat transfer members 40. This allows the stator coil to be cooled more efficiently.

[0040] In the motor (rotating electric machine) 100, the heat transfer member 40 has a plurality of portions (protruding portions) 41 that protrude radially beyond the outer periphery of the coil end portion 22. This increases the surface area of ​​the heat transfer member 40 that comes into contact with the cooling oil when the cooling oil is supplied to the coil end portion 22. This further improves the cooling efficiency of the stator coil.

[0041] In the motor (rotating electric machine) 100, the heat transfer member 40 is made of the same material as the stator coil (coil), which prevents the stator coil from being damaged by the heat transfer member 40 when the coil end portion 22 (coil arch 23) is compression molded or when the motor 100 is heated to a high temperature.

[0042] In the motor (rotating electric machine) 100, ends 411 of the heat transfer members 40 provided between the coil arches 23 are connected to the housing 30 that accommodates the motor (rotating electric machine) 100 via a cover (insulating material) 412. This allows heat at the boundaries of the coil arches 23 to be efficiently released to the outside of the motor 100, and the cover (insulating material) 412 ensures insulation between the stator coil, the heat transfer members 40, and the housing 30.

[0043] In this embodiment, the heat transfer member 40 is formed in a zigzag shape, but the shape of the heat transfer member 40 is not necessarily limited to this as long as it can transfer heat from the boundary portion of the coil arch 23 to the outside of the stator coil.

[0044] Furthermore, as in this embodiment, it is preferable that the heat transfer member 40 has a plurality of portions (protruding portions) 41 that protrude radially beyond the outer periphery of the coil end portion 22, but this is not necessarily limited to this. If there is at least one protruding portion 41, the cooling efficiency is improved.

[0045] In addition, as in this embodiment, the heat transfer member 40 is preferably made of the same material as the stator coil, but is not necessarily limited to this. As long as the heat transfer member 40 is made of a material with high thermal conductivity, it can effectively cool at least the boundary portion of the coil arch 23.

[0046] In addition, in this embodiment, cooling oil is supplied and discharged from the cooling oil supply passage 31 and the cooling oil discharge passage 32 provided in the housing 30, respectively, but this is not necessarily limited to this. The passages through which the cooling oil flows may have any configuration as long as they can supply cooling oil to the coil end portions 22 and discharge the cooling oil from the motor 100 after cooling the coils.

[0047] [Second embodiment] A motor (rotating electric machine) 100 according to a second embodiment will be described with reference to Figures 7 and 8. This embodiment differs from the first embodiment in that it is provided with a cylindrical member 60 that covers the inner diameter side of the stator 20. Elements similar to those in the first embodiment are given the same reference numerals, and their description will be omitted.

[0048] 7 and 8, a motor (rotating electric machine) 100 of this embodiment is provided with a cylindrical member 60, which is a thin, cylindrical member that covers the inner diameter side of the stator 20, on the outer diameter side of the rotor 10. That is, the rotor 10 and the stator 20 are separated by the cylindrical member 60. The outer diameter side and the axial outside of the stator 20 are covered by a housing 30. Therefore, in the motor 100, a coil chamber 70 is formed at both axial ends of the stator 20, which is a closed space formed by the cylindrical member 60, the housing 30, and the stator core 21, and the coil chamber 70 covers the coil end portions 22.

[0049] Therefore, when cooling oil is supplied to the coil end portion 22 from the inlet 33 located at the top of the motor 100 in the housing 30, the cooling oil does not enter the rotor 10 side, and no oil agitation loss occurs. This allows a large flow of cooling oil to be supplied to the coil end portion 22.

[0050] 8, when a large amount of cooling oil is supplied to the coil end portion 22 from the inlet 33 of the cooling oil supply passage 31, the inside of the coil chamber 70 becomes almost oil-tight, and the entire surface of the stator coil comes into contact with the cooling oil. After cooling the stator coil, the cooling oil is discharged into the cooling oil discharge passage 32 from the outlet 34 located below the motor 100 in the housing 30.

[0051] In this manner, in this embodiment, the coil chamber 70 is formed by the cylindrical member 60, the housing 30, and the stator core 21, so a large amount of cooling oil can flow through the coil end portion 22. This improves the cooling efficiency of the stator coil.

[0052] [Third embodiment] A motor (rotating electric machine) 100 according to a third embodiment will be described with reference to Figures 9 and 10. This embodiment differs from the other embodiments in that it is provided with a coil end cover 61 that covers the coil end portion 22. Elements that are the same as those in the other embodiments are given the same reference numerals, and descriptions thereof will be omitted.

[0053] 9 and 10 , the motor (rotating electric machine) 100 of this embodiment is provided with coil end covers 61 at both axial ends of the stator 20, which cover the outer diameter side and axial ends of the coils of the coil end portions 22. Therefore, in the motor 100, a coil chamber 71 is formed at both axial ends of the stator 20, which is a closed space formed by the coil end covers 61 and the stator core 21, and the coil chamber 71 covers the coil end portions 22.

[0054] In addition, the coil end cover 61 has a hole 611 at a position located at the top of the motor 100 that corresponds to the inlet 33 of the housing 30 (overlapping when viewed from a radial direction), and a hole 612 at a position located at the bottom of the motor 100 that corresponds to the outlet 34 of the housing 30 (overlapping when viewed from a radial direction).

[0055] When cooling oil is supplied from the inlet 33 to the coil end portion 22 (coil chamber 71) through the hole 611, the cooling oil does not enter the rotor 10 side, and no oil agitation loss occurs. Therefore, a large flow rate of cooling oil can be supplied to the coil end portion 22.

[0056] 10, when a large amount of cooling oil is supplied from inlet 33 of cooling oil supply passage 31 to coil end portion 22 through hole 611, the inside of coil chamber 71 becomes nearly oil-tight, and the entire surface of the stator coil comes into contact with the cooling oil. After cooling the stator coil, the cooling oil is discharged through hole 612 to cooling oil discharge passage 32 from outlet 34 located below motor 100 in housing 30.

[0057] In this manner, in this embodiment, the coil chamber 71 is formed by the coil end cover 61 and the stator core 21, allowing a large amount of cooling oil to flow through the coil end portion 22. This improves the cooling efficiency of the stator coil.

[0058] [Fourth embodiment] A motor (rotating electric machine) 100 of a fourth embodiment will be described with reference to Figures 11 and 12. This embodiment differs from the third embodiment in that the injection port 33 of the housing 30 is located at the bottom of the motor 100, and that the coil end cover 61 has a notch 614 in a portion located at the top of the motor 100. Elements similar to those in the other embodiments are designated by the same reference numerals, and their description will be omitted.

[0059] 11 and 12, similar to the third embodiment, the motor (rotating electric machine) 100 of this embodiment is provided with coil end covers 61 that cover the outer diameter sides and axial ends of the coils of the coil end portions 22 at both axial ends of the stator 20. Therefore, similar to the third embodiment, the motor 100 has coil chambers 71 that cover the coil end portions 22 formed at both axial ends of the stator 20.

[0060] Furthermore, the housing 30 that accommodates the motor (rotating electric machine) 100 has a cooling oil supply passage 31 formed below the motor 100, through which cooling oil flows, and also has an inlet 33 that opens from the cooling oil supply passage 31 toward the coil end portion 22, also located below the motor 100. As with the other embodiments, a cooling oil discharge passage 32 is also formed in the housing 30 at a portion located below the motor 100.

[0061] Meanwhile, the coil end cover 61 has a hole 613 at a position located below the motor 100, which corresponds to (overlaps with) the fill port 33 of the housing 30. The coil end cover 61 also has a notch 614 as a cooling oil outlet at a position located above the motor 100.

[0062] 12, when cooling oil is supplied from inlet 33 of cooling oil supply passage 31 to coil end portion 22 through hole 613, coil chamber 71 is filled with cooling oil, and the cooling oil that reaches notch 614 is discharged from notch 614 to the outside of coil chamber 71. The cooling oil discharged to the outside of coil chamber 71 is discharged to the outside from cooling oil discharge passage 32 formed in a portion of housing 30 located below motor 100.

[0063] In this manner, in this embodiment, the inlet 33 and hole 613 for supplying cooling oil are provided below the motor 100, so when cooling oil is supplied to the coil end portion 22 (coil chamber 71), the coil chamber 71 is filled with cooling oil. This allows the stator coil to be cooled evenly, improving the cooling efficiency of the coil. In addition, because the coil end cover 61 has a notch (discharge port) 614 provided in a portion located above the motor 100, the cooling oil that fills the coil chamber 71 is discharged from the notch 614 to the outside of the coil chamber 71 (motor 100). This prevents the cooling oil from entering the rotor 10, and therefore prevents oil agitation loss.

[0064] In this embodiment, the notch 614 is used as the outlet for the cooling oil, but this is not necessarily limited to this, and any configuration may be used as long as it can discharge the cooling oil (refrigerant).

[0065] In addition, in all the embodiments, cooling oil is used as the refrigerant for cooling the stator coil, but the refrigerant is not limited to this as long as it is capable of cooling the coil.

[0066] Although the embodiments of the present invention have been described above, the above embodiments merely illustrate some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above embodiments.

Claims

1. A rotating electric machine comprising: a rotor; a stator disposed radially outward of the rotor, the stator having a stator core in which a plurality of coils are disposed, and having coil end portions protruding from ends of the stator core in an axial direction of the stator core, the coil end portions being cooled by a refrigerant, The plurality of coils are wound spirally around the stator core in the radial direction of the stator core, The coil of the coil end portion forms a plurality of arc-shaped coil arches, and a heat transfer member is provided between each coil arch. The heat transfer member has a portion that protrudes radially beyond the outer periphery of the coil end portion. Rotating electric motor.

2. 2. The rotating electric machine according to claim 1, The heat transfer members are formed in a zigzag shape parallel to the coils. Rotating electric motor.

3. 3. The rotating electric machine according to claim 1, The heat transfer member has a plurality of portions that protrude radially beyond the outer periphery of the coil end portion. Rotating electric motor.

4. 3. The rotating electric machine according to claim 1, The heat transfer member is made of the same material as the coil. Rotating electric motor.

5. 3. The rotating electric machine according to claim 1, U-phase, V-phase, and W-phase coils are lap-wound on the stator core, The U-phase, V-phase, and W-phase coils at the coil end portions have the same shape. Rotating electric motor.

6. 3. The rotating electric machine according to claim 1, an end of the heat transfer member is connected to a housing that accommodates the rotating electric machine via an insulating material; Rotating electric motor.

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