Rotating electric machines

Abstract

Provided is a rotating electric machine comprising a rotor having a rotating shaft and a stator disposed radially outward of the rotor and equipped with a stator core on which a plurality of coils are disposed and from an end of which a coil end portion projects in the axial direction of the rotating shaft, wherein said coil end portion is cooled by a refrigerant. The rotating electric machine comprises: first coil covers disposed at both ends of the stator in the axial direction and covering the outer diameter side and axial direction end portions of the coil of the coil end portion; a cylindrical second coil cover covering the inner diameter side of the stator; and a refrigerant flow path formed by the first coil covers, the second coil cover, and the stator core. The coil end portion is positioned within the refrigerant flow path.

Description

[Technical Field]

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

[0002] A conventional method for cooling a motor coil involves dripping cooling oil onto the coil end, but this method has the problem of being unable to supply a large amount of cooling oil.

[0003] JP4586542B2 discloses a rotating electric machine in which coils are fixed to a stator core with molded resin. In this rotating electric machine, an annular oil passage is formed in the coil end portion by the molded resin and a cover, and the motor coil is cooled by flowing a large amount of cooling oil through this oil passage. Summary of the Invention

[0004] In the method described in JP4586542B2, the coil is fixed with a molding resin, so there is a risk that part of the coil conductor may be hidden by the oil passage (cooling passage), and therefore there is still a risk that the motor coil may not be cooled sufficiently.

[0005] The present invention has been made in view of the above-mentioned problems, and has an object to provide a rotating electric machine with improved cooling efficiency for the motor coil.

[0006] According to one aspect of the present invention, there is provided a rotating electric machine including a rotor having a rotating shaft, and a stator disposed radially outward of the rotor and including a stator core on which a plurality of coils are disposed, the stator having coil end portions protruding from ends of the stator core in the axial direction of the rotating shaft, the coil end portions being cooled by a refrigerant. The rotating electric machine includes first coil covers disposed at both axial ends of the stator and covering the outer diameter sides and axial ends of the coils in the coil end portions, a cylindrical second coil cover covering the inner diameter side of the stator, and a refrigerant flow path formed by the first coil cover, the second coil cover, and the stator core, the coil end portions being located within the refrigerant flow path. [Brief explanation of the drawings]

[0007] [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 cross-sectional perspective view of the rotating electric machine. [Figure 3] FIG. 3 is an enlarged view of parts C and D in FIG. [Figure 4] FIG. 4 is an enlarged view of the vicinity of one coil end portion. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0009] 1 is a schematic configuration diagram 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 a system other than a vehicle.

[0010] 1, the motor 100 is composed of a rotor 10 having a rotating shaft 12, a stator 20 including a stator core 21 and coil end portions 22, a first coil cover 30, a second coil cover 40, etc. The motor 100 is housed in a housing 60 made of, for example, aluminum.

[0011] 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.

[0012] 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 motor coils or 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).

[0013] Stator core 21 is a cylindrical member formed by laminating multiple electromagnetic steel plates, and coils are wound around teeth (not shown) formed inside 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. Coil end portions 22 include coil end portion 22A protruding in the axial direction from one axial end of stator core 21 and coil end portion 22B protruding in the axial direction from the other axial end. When current flows through the coils of stator 20, rotor 10 rotates due to the interaction with the permanent magnets provided in rotor core 11.

[0014] The first coil cover 30 is a member that covers the outer diameter side and axial end portions of the coils of the coil end portions 22, and has a generally annular outer shape. The first coil cover 30 is made of insulating resin or the like and is molded by injection molding or the like, although the material and molding method of the first coil cover 30 are not necessarily limited to this. The first coil cover 30 includes a first coil cover 30A arranged at one axial end portion of the stator 20 (the coil end portion 22A side), and a first coil cover 30B arranged at the other axial end portion of the stator 20 (the coil end portion 22B side).

[0015] The first coil cover 30A covers the outer diameter side and axial end portions of the coil end portions 22A, and the inner diameter side end face abuts against the second coil cover 40 described below. Furthermore, on the outer diameter side of the motor 100, the gap between the first coil cover 30A and the stator core 21 is sealed by a housing 60. A high-voltage terminal portion 33 that connects a power line for the stator core 21 (motor 100) to electrical components outside the motor 100, such as an inverter, is provided inside the first coil cover 30A on the upper side of the motor 100. In this embodiment, the gap between the first coil cover 30A and the stator core 21 is sealed by an aluminum housing, but this is not limited thereto, and the first coil cover 30A and the stator core 21 may abut against each other via a sealing member or the like.

[0016] In addition, the first coil cover 30A has an inlet 31A for injecting cooling oil (refrigerant) at a portion located above the motor 100, and an outlet 32A for discharging the cooling oil (refrigerant) at a portion located below the motor 100.

[0017] The first coil cover 30B covers the outer diameter side and axial end of the coil end portion 22B, and the inner diameter side end face abuts against the second coil cover 40 (described later). The outer diameter side of the first coil cover 30B abuts against the side surface of the stator core 21 via a seal member or the like.

[0018] In addition, the first coil cover 30B has an inlet 31B for injecting cooling oil (refrigerant) at a portion located below the motor 100, and a notch 32B as an outlet for discharging the cooling oil (refrigerant) at a portion located above the motor 100.

[0019] The second coil cover 40 is a cylindrical member that covers the inner diameter side of the stator 20. The second coil cover 40 is made of a non-magnetic material such as stainless steel or carbon fiber reinforced plastic (CFRP), and is molded by injection molding or the like. The second coil cover 40 extends outward beyond the coil end portions 22 that protrude from both axial ends of the stator core 21, and separates the rotor 10 from the stator 20.

[0020] Here, the first coil cover 30, which covers the outer shape and axial end of the coil in the coil end portion 22, the second coil cover 40, which covers the inner diameter side of the stator 20, and the stator core 21, which is disposed radially outside the rotor core 11, form a closed space that covers the coil end portion 22. The closed space constitutes a cooling flow path (refrigerant flow path) 50 through which cooling oil flows. That is, the first coil cover 30A, the second coil cover 40, and the stator core 21 form a cooling flow path 50A at one axial end of the stator 20, and the first coil cover 30B, the second coil cover 40, and the stator core 21 form a cooling flow path 50B at the other axial end.

[0021] Cooling oil is injected into cooling flow path 50A through inlet 31A of first coil cover 30A, thereby cooling coil end portion 22A. The cooling oil that has cooled coil end portion 22A is discharged through outlet 32A. Meanwhile, cooling oil is injected into cooling flow path 50B through inlet 31B of first coil cover 30B, thereby cooling coil end portion 22B. The cooling oil that has cooled coil end portion 22B is discharged through notch (discharge port) 32B.

[0022] One known method for cooling motor coils is to drip cooling oil onto the coil ends, but this method does not allow for a large flow of cooling oil, and there is a risk that the coils may not be sufficiently cooled.

[0023] Furthermore, as described in JP4586542B2, when a ring-shaped oil passage is formed in the coil end portion using molded resin and a cover, the molded resin hides part of the coil's conductor from the oil passage (cooling passage), which again raises the risk of the coil not being sufficiently cooled.Furthermore, because the oil passage is formed using molded resin, it is not possible to reduce the motor's weight and the cost may be high.

[0024] In contrast, in this embodiment, a closed space covering the coil end portions 22 is formed by the first coil cover 30, which covers the outer shape and axial end portions of the coils in the coil end portions 22, the second coil cover 40, which covers the inner diameter side of the stator 20, and the stator core 21, which is disposed radially outside the rotor core 11, and this closed space is used as the cooling flow path 50. In this way, because the closed space covering the coil end portions 22 serves as the cooling flow path 50, a large amount of cooling oil can be passed through it, and the flow rate of the cooling oil flowing through the cooling flow path 50 can be increased. In addition, the coil end portions 22 can be exposed to the cooling oil. This improves the cooling efficiency of the coil.

[0025] The cooling structure of the motor 100 will be described in detail below.

[0026] FIG. 2 is a cross-sectional perspective view of the motor (rotating electric machine) 100, with the rotor 10 and the housing 60 removed.

[0027] 2, coil end portion 22A protruding in the axial direction from one axial end portion of stator core 21 is located within cooling flow path 50A, which is a closed space formed by first coil cover 30A, second coil cover 40, and stator core 21. Furthermore, a high-voltage terminal portion 33 is arranged on the upper side of motor 100 inside cooling flow path 50A, for electrically connecting a power supply line of stator core 21 (motor 100) to electrical components such as an inverter outside motor 100.

[0028] On the other hand, the coil end portion 22B protruding axially from the other axial end portion of the stator core 21 is located within the cooling flow path 50B, which is a closed space formed by the first coil cover 30B, the second coil cover 40, and the stator core 21.

[0029] As described above, first coil cover 30A, which is disposed at one axial end of stator 20, has inlet 31A at a location above motor 100 and outlet 32A at a location below motor 100. Meanwhile, first coil cover 30B, which is disposed at the other axial end of stator 20, has inlet 31B at a location below motor 100 and has notch (outlet) 32B at a location above motor 100. Inlet 31A and inlet 31B are connected to an oil pump (not shown) for pumping cooling oil.

[0030] When cooling oil is pumped from the oil pump, the cooling oil is injected into the cooling flow passage 50A through the inlet 31A and into the cooling flow passage 50B through the inlet 31B.

[0031] Cooling oil injected through inlet 31A located at the top of motor 100 is divided into two flows, one to the left and one to the right, in the circumferential direction of cooling channel 50A, passes through cooling channel 50A along coil end portion 22A, and is discharged from outlet 32A located at the bottom of motor 100. This cools coil end portion 22A and the stator coil. The cooling oil injected through inlet 31A also cools high-voltage terminal portion 33 located on the upper side of motor 100 inside cooling channel 50A. The cooling oil discharged from outlet 32A passes through a passage inside motor 100 and is collected in an oil pan (not shown).

[0032] Meanwhile, cooling oil injected from inlet 31B located at the bottom of motor 100 is split into two circumferential flows, one to the left and one to the right, through cooling flow passage 50B due to the protruding pressure of the oil pump, and flows along coil end portion 22B, filling cooling flow passage 50B with cooling oil. This cools coil end portion 22B and the stator coil. When the cooling oil in cooling flow passage 50B reaches notch 32B located at the top of motor 100, the cooling oil is discharged from notch 32B. The cooling oil discharged from notch 32B flows down from the outside of first coil cover 30B and is collected in the oil pan.

[0033] Furthermore, when there is a pressure difference between cooling flow path 50A and cooling flow path 50B, the cooling oil in cooling flow path 50A or 50B enters the open slots (between the teeth) of stator core 21. This causes the open slots to come into contact with the cooling oil, cooling not only the stator coil but also stator core 21.

[0034] In this way, in cooling flow channel 50A formed at one axial end of motor 100, cooling oil flows from an upper portion to a lower portion of motor 100, and in cooling flow channel 50B formed at the other axial end, cooling oil flows from a lower portion to an upper portion of motor 100. This allows the motor coil to be cooled evenly and without unevenness.

[0035] Furthermore, the cooling flow channel 50A formed at one axial end of the motor 100 flows cooling oil from a portion located at the top of the motor 100, thereby effectively cooling the high-voltage terminal 33 located at the top of the motor 100. Meanwhile, the cooling flow channel 50B formed at the other axial end of the motor 100 supplies cooling oil from a portion located at the bottom of the motor 100. The cooling oil fills the cooling flow channel 50B from the bottom to the top, and air is expelled from the cooling flow channel 50B. This prevents air from being trapped inside the cooling flow channel 50B. This allows the cooling oil to evenly contact the coil surface, efficiently cooling the motor coil. That is, at the one axial end of the motor 100, the layout of the high-voltage terminal 33 connected to electrical components such as the inverter and cooling the high-voltage terminal 33 are prioritized, while at the other axial end where the high-voltage terminal 33 is not located, the motor coil is efficiently cooled.

[0036] Preferably, the inlets 31A and 31B are positioned so that the amount of cooling oil diverted radially counterclockwise is equal to the amount of cooling oil diverted radially clockwise. This allows the coil end portions 22A and 22B to be cooled more efficiently and evenly. The positions of the inlets 31A and 31B that result in the same diverted flow rates can be determined in advance by experimentation or the like.

[0037] As described above, in this embodiment, the first coil cover 30, the second coil cover 40, and the stator core 21 form a closed space (cooling flow path 50) that covers the coil end portions 22, and the motor coil is cooled by the cooling oil that flows through this closed space (cooling flow path 50). Because the closed space that covers the coil end portions 22 serves as the cooling flow path 50, a large amount of cooling oil can flow through the cooling flow path 50, increasing the flow rate of the cooling oil flowing through the cooling flow path 50. Furthermore, the coil end portions 22 can be exposed to the cooling oil. The higher the flow rate and the larger the contact area between the coil and the refrigerant, the higher the cooling efficiency of the coil. In the motor 100 of this embodiment, the cooling oil flow rate and the contact area with the coil can be increased, thereby improving the cooling efficiency of the coil compared to conventional methods such as dripping cooling oil or spraying refrigerant onto the coil end portions, or forming an annular cooling flow path in the coil end portions using molded resin and a cover.

[0038] 3A and 3B are enlarged views of a portion of the motor 100, with (a) being an enlarged view of part C in Fig. 1 and (b) being an enlarged view of part D in Fig. 1. Note that Fig. 3 shows the motor 100 with the rotor 10 and housing 60 removed.

[0039] As shown in FIG. 3, the second coil cover 40, which covers the inner diameter side of the stator 20, extends outward beyond the coil end portions 22 that protrude from both axial ends of the stator core 21, and abuts against the first coil cover 30 in the radial direction at both ends.

[0040] More specifically, second coil cover 40 has, at one axial end (coil end 22A side), thick portion 41 that is radially thicker than other portions, and thick portion 41 abuts against first coil cover 30A in the radial direction via sealing member 42A such as an O-ring. Furthermore, second coil cover 40 abuts against first coil cover 30B in the radial direction at the other axial end (coil end 22B side) via sealing member 42B such as an O-ring.

[0041] In this way, both axial ends of the second coil cover 40 extend outward beyond the coil end portions 22, and the first coil cover 30 and the second coil cover 40 abut radially at both ends of the second coil cover 40, preventing cooling oil from leaking from the cooling flow paths 50A, 50B. This prevents cooling oil from entering the rotor 10, preventing oil agitation loss. Furthermore, because the second coil cover 40 abuts the first coil covers 30A, 30B via seal members 42A, 42B, cooling oil is further prevented from leaking from the cooling flow paths 50A, 50B.

[0042] In addition, the second coil cover 40 has a thick portion 41 at one axial end that abuts radially against the first coil cover 30, which increases the rigidity of the second coil cover 40 and increases the sealing pressure resistance of the sealing member 42A between the first coil cover 30A and the second coil cover 40, thereby improving sealing performance.

[0043] The sealing members 42A and 42B are not limited to O-rings, and the gap between the first coil cover 30 and the second coil cover 40 may be sealed with adhesive or the like without using sealing members.

[0044] 3, inside the first coil cover 30A at one axial end, an insulator 34 is interposed between the outer diameter side of the coil end portion 22A and the stator core 21. The second coil cover 40 and the coil end portion 22 are in contact with each other via an insulator 43.

[0045] In this way, since the insulator 34 is provided between the outer diameter side of the coil end portion 22A and the stator core 21, the bundle of coils (copper wires) of the coil end portion 22A can be arranged without considering the insulation distance between the coil end portion 22A and the stator core 21. Furthermore, since the insulator 43 is provided between the second coil cover 40 and the coil end portion 22, insulation between the second coil cover 40 and the coil end portion 22 is ensured.

[0046] As described above, the second coil cover 40 is made of a non-magnetic material. This prevents the second coil cover 40 from affecting the magnetic field between the rotor 10 and the stator 20. Preferably, the second coil cover 40 is made of a non-magnetic and non-conductive material, such as glass fiber reinforced plastic (GFRP). Using a non-conductive material prevents the generation of induced electromotive force within the second coil cover 40 due to the interlinkage magnetic flux generated between the rotor 10 and the stator 20, thereby suppressing heat generation in the second coil cover. When a non-conductive material is used for the second coil cover 40, insulation between the second coil cover 40 and the coil end portion 22 is ensured, so the insulator 43 does not need to be provided.

[0047] FIG. 4 is an enlarged cross-sectional view of the vicinity of one coil end portion 22A.

[0048] 4, first coil cover 30A and stator core 21 are sealed at the top of motor 100 by housing 60 that houses motor 100. Insulator 43 is interposed between coil end portion 22A and second coil cover 40, and insulator 34 is interposed between the outer diameter side of coil end portion 22A and stator core 21. As described above, first coil cover 30A and stator core 21 may be configured to directly abut on each other without housing 60 in between.

[0049] The insulator 34 extends from the middle of one end face of the stator core 21 toward the outer diameter side along the outer shape of the stator core 21, and further extends toward the outer diameter side of the coil end portion 22A. The insulator 34 is sealed by a liquid gasket or the like on the outer diameter side of the coil end portion 22A in a fitted state between the first coil cover 30A and the coil end portion 22A.

[0050] Here, the power supply wires of the motor 100 (stator core 21) are routed through the coil end portion 22A. However, if the area of ​​the coil in the coil end portion 22A covered by the power supply wires increases, the cooling effect of the cooling oil may decrease. In contrast, in this embodiment, an insulator 34 is provided between the outer diameter side of the coil end portion 22A and the stator core 21. This allows the bundle of coils (copper wires) in the coil end portion 22A to be positioned without considering the insulation distance from the stator core 21. For example, the bundle of coils (copper wires) in the coil end portion 22A can be bent toward the outer diameter side and further toward the stator core 21, allowing the power supply wires to be gathered on the outer diameter side of the coil end portion 22A. This increases the exposed surface area of ​​the coil (copper wire) in the coil end portion 22A, thereby further improving the cooling effect of the cooling oil.

[0051] According to the motor (rotating electric machine) 100 of the above embodiment, the following effects can be obtained.

[0052] The motor (rotating electric machine) 100 includes a cooling flow path (refrigerant flow path) 50, which is a closed space formed by a first coil cover 30 that covers the outer diameter side and axial end of the coil of the coil end portion 22, a cylindrical second coil cover 40 that covers the inner diameter side of the stator 20, and the stator core 21. The coil end portion 22 is located within the cooling flow path (refrigerant flow path) 50. Because the closed space that covers the coil end portion 22 serves as the cooling flow path (refrigerant flow path) 50 for cooling the coil end portion 22, a large amount of cooling oil can be flowed through the cooling flow path (refrigerant flow path) 50, thereby increasing the flow rate of the cooling oil flowing through the cooling flow path 50. Furthermore, the exposed area of ​​the coil end portion 22 relative to the cooling oil can be increased. This improves the cooling efficiency of the motor coil.

[0053] In the motor (rotating electric machine) 100, a first coil cover 30A disposed at one axial end of the stator 20 has an inlet 31A for injecting cooling oil (refrigerant) at a portion located at the top of the motor (rotating electric machine) 100 and an outlet 32A for discharging the cooling oil (refrigerant) at a portion located at the bottom. Meanwhile, a first coil cover 30B disposed at the other axial end of the stator 20 has an inlet 31B for injecting cooling oil (refrigerant) at a portion located at the bottom of the motor (rotating electric machine) 100 and a notch (outlet) 32B for discharging the cooling oil (refrigerant) at a portion located at the top. This allows cooling oil to flow from top to bottom in the cooling flow channel 50A formed at one axial end of the motor (rotating electric machine) 100, and from bottom to top in the cooling flow channel 50B formed at the other axial end. This allows the motor coil to be cooled evenly and uniformly. This improves the cooling efficiency of the motor coil.

[0054] Motor (rotating electric machine) 100 is provided with a high-voltage terminal 33 connected to the power line and inverter of motor (rotating electric machine) 100 on the upper side of motor (rotating electric machine) 100 inside first coil cover 30A arranged at one axial end of stator 20. That is, high-voltage terminal 33 is provided near inlet 31A through which cooling oil (refrigerant) is injected. Therefore, high-voltage terminal 33 can also be efficiently cooled by the cooling oil (refrigerant) that cools the motor coil.

[0055] Motor (rotating electric machine) 100 includes insulator 34 between the outer diameter side of coil end portion 22A and stator core 21. This allows the bundle of coils (copper wires) in coil end portion 22A to be arranged without considering the insulation distance from stator core 21, and the exposed surface area of ​​the coils (copper wires) in coil end portion 22A can be increased. This further improves the cooling effect of cooling oil (refrigerant).

[0056] In motor (rotating electric machine) 100, both axial ends of second coil cover 40 extend outward beyond coil end portions 22, and first coil cover 30 and second coil cover 40 abut in the radial direction via seal members 42A, 42B. This prevents cooling oil (refrigerant) from leaking from cooling flow path (refrigerant flow path) 50 formed by first coil cover 30, second coil cover 40, and stator core 21. This prevents cooling oil (refrigerant) from entering the rotor 10, preventing churning loss.

[0057] In motor (rotating electric machine) 100, second coil cover 40 has thick portion 41 at one axial end that radially abuts against first coil cover 30. This increases the rigidity of second coil cover 40, increases the seal pressure resistance of seal member 42A between first coil cover 30A and second coil cover 40, and improves sealing performance.

[0058] In motor (rotating electric machine) 100, second coil cover 40 and coil end portion 22 abut against each other via insulator 43. This ensures insulation between second coil cover 40 and coil end portion 22.

[0059] In the motor (rotating electric machine) 100, the second coil cover 40 is made of a non-magnetic material, which prevents the second coil cover 40 from affecting the magnetic field between the rotor 10 and the stator 20.

[0060] In this embodiment, cooling oil is used as the refrigerant for cooling the motor coil, but the refrigerant is not limited to this as long as it can cool the coil.

[0061] In addition, as in this embodiment, it is preferable that the second coil cover 40 be made of a non-magnetic material (and a non-conductive material), but this is not necessarily limited to this. In addition, in this embodiment, the second coil cover 40 is molded by injection molding, but the molding method of the second coil cover 40 is not limited to this.

[0062] In addition, in this embodiment, the outlet of the cooling flow path 50B formed at the other axial end of the motor 100 is a notch 32B, but this is not necessarily limited to this and any configuration may be used as long as it can discharge the refrigerant.

[0063] Furthermore, as in this embodiment, it is preferable to provide the high-voltage terminal portion 33 inside the first coil cover 30A, but this is not necessarily limited to this, and the high-voltage terminal portion 33 may be provided in another location.

[0064] Furthermore, as in this embodiment, it is preferable to provide insulators 34, 43 between the outer diameter side of coil end portion 22A and stator core 21, and between second coil cover 40 and coil end portion 22, but this is not necessarily limited to this. Even in a configuration without insulators 34, 43, the effect of improving the cooling efficiency of the motor coil can be obtained.

[0065] In addition, in this embodiment, the second coil cover 40 has the thick portion 41 at one axial end, but this is not necessarily limited to this. The thick portion 41 may be provided at the other axial end of the second coil cover 40, or may be provided at both axial ends. Also, a configuration without the thick portion 41 is possible. Even in this case, the effect of improving the cooling efficiency of the motor coil can be obtained.

[0066] Furthermore, as in this embodiment, it is preferable that the first coil cover 30 and the second coil cover 40 abut in the radial direction via the seal members 42A, 42B, but the seal members 42A, 42B are not essential components.

[0067] 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 having a rotating shaft; and a stator disposed radially outward of the rotor, the stator having a stator core in which a plurality of coils are disposed, the stator having coil end portions protruding from ends of the stator core in an axial direction of the rotating shaft, the coil end portions being cooled by a refrigerant, a first coil cover disposed at each end of the stator in the axial direction and covering an outer diameter side of the coil of the coil end portion and the axial end portion; a cylindrical second coil cover that covers the inner diameter side of the stator; a refrigerant flow path formed by the first coil cover, the second coil cover, and the stator core, The coil end portion is located within the refrigerant flow path, a first coil cover disposed at one end of the stator in the axial direction has an inlet for injecting the refrigerant at a portion located at an upper part of the rotating electric machine, and has an outlet for discharging the refrigerant at a portion located at a lower part of the rotating electric machine, a first coil cover disposed at the other end of the stator in the axial direction has an inlet for injecting the refrigerant at a portion located at a lower part of the rotating electric machine, and has an outlet for discharging the refrigerant at a portion located at an upper part of the rotating electric machine, a high-voltage terminal portion connected to a power line and an inverter of the rotating electric machine is provided on the upper side inside the first coil cover at the one side end; Rotating electric motor.

2. 2. The rotating electric machine according to claim 1, an insulator is provided between the outer diameter side of the coil end portion and the stator core inside the first coil cover at the one side end; Rotating electric motor.

3. 3. The rotating electric machine according to claim 1, the second coil cover has both axial ends extending outward beyond the coil end portion, The first coil cover and the second coil cover abut against each other in the radial direction via a seal member. Rotating electric motor.

4. 4. The rotating electric machine according to claim 3, The second coil cover has a thick portion at at least one end in the axial direction, and the thick portion and the first coil cover abut against each other in the radial direction via a seal member. Rotating electric motor.

5. 3. The rotating electric machine according to claim 1, The second coil cover and the coil end portion abut against each other via an insulator. Rotating electric motor.

6. 3. The rotating electric machine according to claim 1, The second coil cover is made of a non-magnetic material. Rotating electric motor.

7. 7. The rotating electric machine according to claim 6, The second coil cover is made of a non-conductive material. Rotating electric motor.

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