Rotary electric machine

Abstract

To provide a rotary electric machine capable of efficiently cooling between stacked lead wires in a coil formed of a stack of lead wires.SOLUTION: A rotating electric machine 50 comprises: a stator core 53 having a yoke 54 and a plurality of teeth 55 extending from an inner peripheral surface of the yoke 54; and a coil 60 formed by winding of the coil 60 on each tooth 55 with in a concentrated winding configuration. The rotating electric machine 50 includes a heat dissipation member 70. The heat dissipation member 70 is provided on at least one of a first coil end 61 and a second coil end. The heat dissipation member 70 dissipates heat generated by the coil 60.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] The stator of a rotating electrical machine includes a stator core and a coil. The stator core has a cylindrical yoke and a plurality of teeth. The plurality of teeth extend from the inner peripheral surface of the yoke radially inward of the yoke. The coil is formed by concentrically winding a conducting wire around the plurality of teeth.

[0003] The coil has coil ends on the tooth end faces that are the both ends of the teeth in the axial direction of the stator core. The coil formed by concentric winding is formed by laminating a plurality of layers of the conducting wire wound around the teeth. For example, in the stator disclosed in Patent Document 1, each coil end of the stator has a first coil portion formed by winding the conducting wire along the tooth end face, and a second coil portion configured by winding the conducting wire so as to cover the first coil portion.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The operation of a rotating electrical machine is caused by energization of the coil and involves heat generation of the coil due to the energization. In a coil formed by laminating a plurality of conducting wires, such as the first coil portion and the second coil portion that covers the first coil portion, it is desirable to cool between the laminated conducting wires.

Means for Solving the Problems

[0006] The rotating electrical machine for solving the above problems includes a rotating shaft, a rotor fixed to the rotating shaft and rotating integrally with the rotating shaft, a stator disposed outside the rotor, a cylindrical yoke, and a stator core having a plurality of teeth protruding from the inner peripheral surface of the yoke toward the rotor, a coil wound around each tooth in concentrated winding, and a stator having a housing portion for housing the rotating shaft, the rotor, and the stator. The coil has a coil end protruding in the axial direction of the stator core more than the stator core, and a heat radiating member for radiating the heat of the coil is provided at the coil end. The coil end has a first coil end layer provided between the stator core and the heat radiating member, and a second coil end layer provided on the outer peripheral side of the first coil end layer with the heat radiating member interposed therebetween. The gist is that a gap is formed by the heat radiating member between the first coil end layer and the second coil end layer.

[0007] According to this, the heat radiating member radiates the heat of the coil transmitted through each of the first coil end layer and the second coil end layer. That is, the rotating electrical machine releases heat from between the first coil end layer and the second coil end layer by the heat radiating member. As a result, the rotating electrical machine can efficiently cool the heat generated between the first coil end layer and the second coil end layer as compared with the case where the heat radiating member is not provided.

[0008] In addition, a gap is formed at the coil end by providing the heat radiating member. That is, the coil can radiate the heat generated between the first coil end layer and the second coil end layer through the gap. Therefore, the rotating electrical machine can cool the coil by forming a gap with the heat radiating member.

[0009] In the above rotating electrical machine, the heat radiating member is plate-shaped and has a first surface facing the stator core in the axial direction of the stator core and a second surface on the opposite side of the first surface in the axial direction of the stator core. The second surface may have an inclined surface whose plate thickness gradually decreases as it approaches the rotating shaft.

[0010] As a method of winding a coil around teeth in a concentrated winding manner, there is a method in which the coil is first formed into a wound state and then the teeth are inserted into the formed coil. In this case, the inclined surface functions as a surface for guiding the insertion of the teeth into the formed coil. As a result, it becomes easier to manufacture a rotating electrical machine having a heat radiating member as compared with the case where the heat radiating member does not have an inclined surface.

[0011] In the above rotating electrical machine, the heat radiating member may have a contact surface that contacts the housing portion. According to this, the heat radiating member can exchange heat with the coil end and also with the housing portion via the contact surface. That is, the heat radiating member can conduct the heat conducted from the coil end to the housing portion. As a result, the rotating electrical machine can efficiently cool the space between the first coil end layer and the second coil end layer as compared with the case where the heat radiating member does not contact the housing portion.

[0012] In the above rotating electrical machine, the housing portion is provided with a housing water passage through which cooling water for cooling the stator flows, and a housing branch water passage that branches from the housing water passage and opens toward the contact surface. The heat radiating member may be provided with a heat radiating member water passage that opens to the contact surface so that cooling water for cooling the coil end flows from the housing branch water passage.

[0013] According to this, the cooling water flowing through the housing water passage cools the stator and also cools the heat radiating member by flowing through the heat radiating member water passage via the housing branch water passage. As a result, the rotating electrical machine can efficiently cool the space between the first coil end layer and the second coil end layer as compared with the case where the heat radiating member is not cooled by the cooling water flowing through the heat radiating member water passage.

[0014] In the above rotating electrical machine, resin that covers the first coil end layer and the second coil end layer and is molded so as to contact the heat radiating member and the housing portion may be molded in the gap.

[0015] According to this, the heat generated between the first coil end layer and the second coil end layer is transmitted to the housing portion via the heat radiating member and the resin in the void. That is, the rotating electrical machine can efficiently cool between the first coil end layer and the second coil end layer more efficiently compared to, for example, the case where heat is transmitted to the housing portion only by the heat radiating member.

Advantages of the Invention

[0016] According to the present invention, in a coil formed by laminating conductive wires, it is possible to efficiently cool between the laminated conductive wires.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0018] [First Embodiment] Hereinafter, a first embodiment in which the rotating electrical machine is embodied will be described with reference to FIGS. 1 to 4. The rotating electrical machine of the present embodiment is mounted on an electric compressor.

[0019] <Overall Image of the Electric Compressor> As shown in FIG. 1, the electric compressor 100 includes a housing 10, a rotating electric machine 50, and a compression mechanism 27. The rotating electric machine 50 has a rotating shaft 20 and rotates the rotating shaft 20. The compression mechanism 27 is driven in accordance with the rotation of the rotating shaft 20 to compress a fluid. The rotating electric machine 50 has a heat dissipation member 70. The rotating electric machine 50 forms a part of the electric compressor 100. The electric compressor 100 is a centrifugal compressor mounted on a fuel cell vehicle.

[0020] <Housing> As shown in FIG. 1, the housing 10 includes a first compressor housing 11, a second compressor housing 12, a first plate 13, a second plate 14, a third plate 15, and a motor housing 16 as a housing portion. The motor housing 16 houses a stator 52 as described later and constitutes the rotating electric machine 50. The first compressor housing 11, the second compressor housing 12, the first plate 13, the second plate 14, the third plate 15, and the motor housing 16 are arranged in the axial direction of the housing 10. The housing 10 has the first compressor housing 11 and the second compressor housing 12 as end portions in the axial direction of the housing 10. Then, in the axial direction of the housing 10, the first plate 13, the second plate 14, the motor housing 16, and the third plate 15 are arranged in order from the first compressor housing 11 toward the second compressor housing 12.

[0021] The first compressor housing 11, the second compressor housing 12, the first plate 13, the second plate 14, the third plate 15, and the motor housing 16 are made of a metal material. In the housing 10, the first compressor housing 11, the second compressor housing 12, the first plate 13, the second plate 14, the third plate 15, and the motor housing 16 define a housing insertion hole 10a.

[0022] The first compressor housing 11 includes a first compressor inner peripheral surface 11b that defines a first suction port 11a. Cleaned air by an air cleaner (not shown) flows into the first suction port 11a.

[0023] The first plate 13 includes an inner peripheral surface that defines a first plate insertion hole 13a. The first plate 13 is connected to the first compressor housing 11. An introduction passage 13b is formed in the first plate 13. The first end of the introduction passage 13b opens on the inner peripheral surface of the first plate 13 and communicates with the first plate insertion hole 13a. A branch pipe 43 (described later) is connected to the second end of the introduction passage 13b.

[0024] The second plate 14 includes an inner peripheral surface that defines a second plate insertion hole 14a extending in the axial direction of the housing 10. The second plate 14 is connected to the first plate 13. A first bearing 23 is held on the inner peripheral surface of the second plate 14.

[0025] The motor housing 16 has a peripheral wall portion 16f and a bottom wall portion 16b. The motor housing 16 has a motor housing inner peripheral surface 16a as an inner peripheral surface on the peripheral wall portion 16f. The motor housing 16 is connected to the second plate 14 and the third plate 15.

[0026] Among the ends of the motor housing 16 in the axial direction of the housing 10, the end different from the end to which the second plate 14 is connected is the bottom wall portion 16b. A second bearing 24 is held on the bottom wall portion 16b.

[0027] The motor housing 16 and the second plate 14 define a motor chamber 16c. In other words, the housing 10 defines a motor chamber 16c. The motor housing 16 houses a rotating electric machine 50 (described later) in the motor chamber 16c.

[0028] Inside the peripheral wall portion 16f that constitutes the motor housing 16, a housing water passage 16d is formed. Cooling water, which is a cooling medium for cooling the rotating electric machine 50, flows through the housing water passage 16d.

[0029] The third plate 15 has an inner peripheral surface that defines a third plate insertion hole 15a. The third plate 15 is connected to the motor housing 16. A discharge passage 15b is formed in the third plate 15. The first end of the discharge passage 15b opens on the inner peripheral surface of the third plate 15 and communicates with the third plate insertion hole 15a. The second end of the discharge passage 15b opens on the outer surface of the third plate 15.

[0030] The second compressor housing 12 has a second compressor inner peripheral surface 12b that defines a second suction port 12a. The second suction port 12a is connected to a connection pipe 45, which will be described later. The second compressor housing 12 is connected to the third plate 15.

[0031] In the housing 10, a first impeller chamber 31, a first discharge chamber 32, and a first diffuser flow path 33 are formed. The first impeller chamber 31, the first discharge chamber 32, and the first diffuser flow path 33 are formed by the first compressor housing 11 and the first plate 13.

[0032] The first impeller chamber 31 communicates with the first suction port 11a. The first discharge chamber 32 extends around the first impeller chamber 31 around the axis of the first suction port 11a. The first diffuser flow path 33 communicates the first impeller chamber 31 and the first discharge chamber 32. The first impeller chamber 31 communicates with the first plate insertion hole 13a.

[0033] The housing 10 is formed with a first discharge passage 34. The first discharge passage 34 is formed in the first compressor housing 11. The first end of the first discharge passage 34 opens into the first discharge chamber 32, and a connection pipe 45 is connected to the second end of the first discharge passage 34. Accordingly, the connection pipe 45 connects the second suction port 12a and the first discharge passage 34.

[0034] The housing 10 is formed with a second impeller chamber 35, a second discharge chamber 36, and a second diffuser flow path 37. The second impeller chamber 35, the second discharge chamber 36, and the second diffuser flow path 37 are formed between the second compressor housing 12 and the third plate 15. The second impeller chamber 35 communicates with the second suction port 12a. The second discharge chamber 36 extends around the second impeller chamber 35 and around the axis of the second suction port 12a. The second diffuser flow path 37 communicates the second impeller chamber 35 and the second discharge chamber 36. The second impeller chamber 35 communicates with the third plate insertion hole 15a.

[0035] The housing 10 is formed with a second discharge passage 38. The second discharge passage 38 is formed in the second compressor housing 12. The first end of the second discharge passage 38 opens into the second discharge chamber 36, and the first end of the supply pipe 41 is connected to the second end of the second discharge passage 38.

[0036] The second end of the supply pipe 41 is connected to the fuel cell stack 42. The supply pipe 41 is connected to the branch pipe 43 in the middle of the path connecting the second discharge passage 38 and the fuel cell stack 42. The branch pipe 43 connects the introduction passage 13b and the supply pipe 41. In other words, the second discharge passage 38 is connected to the fuel cell stack 42 via the supply pipe 41 and is connected to the introduction passage 13b via the supply pipe 41 and the branch pipe 43.

[0037] An intercooler 44 as a cooling device is provided in the middle of the branch pipe 43. The intercooler 44 cools the air flowing through the branch pipe 43. <Rotating shaft> As shown in FIG. 1, the rotating shaft 20 is housed in the housing 10 with the axis of the rotating shaft 20 coinciding with the axis of the housing 10. The rotating shaft 20 is rotatably supported by the second plate 14 via the first bearing 23 and is rotatably supported by the motor housing 16 via the second bearing 24.

[0038] The first end in the axial direction of the rotating shaft 20 protrudes into the interior of the first impeller chamber 31 through the first plate insertion hole 13a, and the second end in the axial direction of the rotating shaft 20 protrudes into the interior of the second impeller chamber 35 through the third plate insertion hole 15a.

[0039] The first impeller 21 is connected to the first end of the rotating shaft 20, and the second impeller 22 is connected to the second end of the rotating shaft 20. The first impeller 21 is housed in the first impeller chamber 31. The first impeller 21 rotates integrally with the rotating shaft 20 to compress the air inhaled into the first impeller chamber 31.

[0040] The second impeller 22 is housed in the second impeller chamber 35. The second impeller 22 rotates integrally with the rotating shaft 20 to compress the air inhaled into the second impeller chamber 35. The second impeller 22 rotates to compress the air after being compressed by the first impeller 21.

[0041] The first impeller 21 and the second impeller 22 are driven along with the rotation of the rotating shaft 20 and constitute a compression mechanism 27 for compressing air. That is, the electric compressor 100 has a compression mechanism 27 that is driven along with the rotation of the rotating shaft 20 to compress air as a fluid.

[0042] The first seal member 25 is provided between the inner peripheral surface of the first plate 13 that defines the first plate insertion hole 13a and the peripheral surface of the rotating shaft 20. The first seal member 25 suppresses the leakage of air from the first impeller chamber 31 along the peripheral surface of the rotating shaft 20 toward the motor chamber 16c. The first seal member 25 is, for example, a seal ring.

[0043] The second seal member 26 is provided between the inner peripheral surface of the third plate 15 that defines the third plate insertion hole 15a and the peripheral surface of the rotating shaft 20. The second seal member 26 suppresses the leakage of air from the second impeller chamber 35 along the peripheral surface of the rotating shaft 20 toward the motor chamber 16c. The second seal member 26 is, for example, a seal ring.

[0044] <Overall image of the rotating electrical machine> As shown in FIG. 1, the rotating electrical machine 50 includes a rotating shaft 20, a rotor 51, a stator 52, and a motor housing 16 as a housing portion. The rotor 51 is fixed to the rotating shaft 20. The rotor 51 includes a cylindrical rotor core 51a fixed to the rotating shaft 20 and a plurality of permanent magnets (not shown) provided on the rotor core 51a. The rotor 51 rotates integrally with the rotating shaft 20. The motor housing 16 houses the rotating shaft 20, the rotor 51, and the stator 52.

[0045] <Stator> The stator 52 is fixed to the motor housing 16. The outer peripheral surface of the stator 52 is located at a position facing the inner peripheral surface 16a of the motor housing. The motor housing 16 is provided with a housing water passage 16d through which cooling water for cooling the stator 52 flows. The stator core 53 is cooled by the cooling water flowing through the housing water passage 16d. The stator 52 is disposed outside the rotor 51. The stator 52 includes a cylindrical stator core 53 and a coil 60. That is, the rotating electrical machine 50 has a stator core 53. The stator core 53 has an inner peripheral surface that defines a stator core insertion hole 53c as an insertion hole. The stator core 53 includes a coil 60.

[0046] The stator core 53 is fixed to the inner peripheral surface 16a of the motor housing. The axial direction of the stator core 53 coincides with the axial direction of the housing 10. The stator core 53 has a first stator core end face 53a and a second stator core end face 53b as end faces in the axial direction of the stator core 53. The first stator core end face 53a is the end face that is located on the first compressor housing 11 side in the axial direction of the housing 10 among the end faces provided in the stator core 53. The second stator core end face 53b is the end face that is located on the second compressor housing 12 side among the end faces provided in the stator core 53, and is an end face different from the first stator core end face 53a in the axial direction of the housing 10. In the motor chamber 16c, the stator core 53 is positioned such that the first stator core end face 53a faces the second plate 14 and the second stator core end face 53b faces the bottom wall portion 16b.

[0047] As shown in FIG. 2, the stator core 53 includes a cylindrical yoke 54 and a plurality of teeth 55. Each tooth 55 extends from the inner peripheral surface of the yoke 54. In other words, the stator core 53 has a cylindrical yoke 54 and a plurality of teeth 55 that project from the inner peripheral surface of the yoke 54 toward the rotor 51. The plurality of teeth 55 are arranged at intervals in the circumferential direction of the yoke 54. Each tooth 55 extends in the radial direction of the yoke 54 from the inner peripheral surface of the yoke 54. Each tooth 55 has a tooth base end 55a at the end that is connected to the yoke 54 among the ends in the extending direction of each tooth 55. Also, each tooth 55 has a tooth tip end 55b as an end different from the tooth base end 55a among the ends in the extending direction of each tooth 55. The tooth tip ends 55b of each tooth 55 are located on a concentric circle. Each tooth 55 has two tooth side faces 55c as side faces in the circumferential direction of the yoke 54. In each tooth 55, each of the two tooth side faces 55c is continuous with the inner peripheral surface of the yoke 54.

[0048] Both end faces of the yoke 54 in the axial direction of the stator core 53 are flat surfaces. Both end faces of each tooth 55 in the axial direction of the stator core 53 are flat surfaces. In the axial direction of the stator core 53, the length of the yoke 54 and the length of each tooth 55 are the same. Therefore, each end face of the yoke 54 and each end face of each tooth 55 are on the same plane.

[0049] The end face of the stator core 53 in the axial direction of the stator core 53 is divided into a portion that constitutes the end face of the yoke 54 and a portion that constitutes the end face of each tooth 55. As shown in FIG. 1, the first tooth end face 55d is a portion of the first stator core end face 53a that is constituted by each tooth 55. The second tooth end face 55e is a portion of the second stator core end face 53b that is constituted by each tooth 55. In other words, each tooth 55 has the first tooth end face 55d on one side and the second tooth end face 55e on the other side among the end faces of the stator core 53 in the axial direction. That is, each tooth 55 has the first tooth end face 55d and the second tooth end face 55e as tooth end faces that are the end faces of the teeth 55 located in the axial direction of the stator core 53, respectively. In each tooth 55, the first tooth end face 55d and the second tooth end face 55e are connected by each of the two tooth side faces 55c.

[0050] As shown in FIG. 2, slots 56 are formed in the stator core 53. The slots 56 are formed between adjacent teeth 55 in the circumferential direction of the yoke 54. <Coil> As shown in FIGS. 1, 2, and 3, the coil 60 is wound around each tooth 55 in concentrated winding. That is, the stator 52 has coils 60 wound around each tooth 55 in concentrated winding. The coil 60 includes a first coil layer 60b that surrounds the outer surface of each tooth 55 and a second coil layer 60c provided outside the first coil layer 60b. The coil 60 forms, for example, the first coil layer 60b and the second coil layer 60c formed in an annular shape on each tooth 55, and inserts the teeth 55 into the first coil layer 60b and the second coil layer 60c by an inserter (not shown).

[0051] The coil 60 includes a first coil end 61 and a second coil end 62 which are coil ends. The first coil end 61 and the second coil end 62 are part of the coil 60. The first coil end 61 projects from the first stator core end face 53a toward the second plate 14 in the axial direction of the stator core 53. The second coil end 62 projects from the second stator core end face 53b which is an end face of the stator core 53 toward the bottom wall portion 16b of the motor housing 16. That is, the coil 60 has the first coil end 61 and the second coil end 62 that project in the axial direction of the stator core 53 more than the stator core 53 itself.

[0052] The first coil end 61 has a first inner layer 61a which is a first coil end layer surrounding the outer surface of the tooth 55, and a first outer layer 61b which is a second coil end layer laminated on the outer peripheral side of the first inner layer 61a. The first inner layer 61a is formed by the first coil layer 60b, and the first outer layer 61b is formed by the second coil layer 60c. The first coil end 61 is formed by laminating the first inner layer 61a and the first outer layer 61b on the first stator core end face 53a.

[0053] The first inner layer 61a and the first outer layer 61b are formed by the portions that cover the first tooth end face 55d and are arranged in the radial direction of the stator core 53 among the coils 60 wound around each tooth 55. The first inner layer 61a extends along the first tooth end face 55d and is in contact with the first tooth end face 55d. The first outer layer 61b is located on the side of the second plate 14 rather than the first inner layer 61a in the axial direction of the stator core 53. The first outer layer 61b covers the first inner layer 61a.

[0054] In the axial direction of the stator core 53, a heat radiating member 70, which will be described later, is provided between the first inner layer 61a and the first outer layer 61b. The first inner layer 61a and the first outer layer 61b are in contact with the heat radiating member 70. Also, the first inner layer 61a and the first outer layer 61b sandwich the heat radiating member 70 in the axial direction of the stator core 53.

[0055] The second coil end 62 includes a second inner layer 62a, which is a first coil end layer surrounding the outer surface of the tooth 55, and a second outer layer 62b, which is a second coil end layer laminated on the second inner layer 62a on the outer peripheral side of the second inner layer 62a. The second inner layer 62a is formed by the first coil layer 60b, and the second outer layer 62b is formed by the second coil layer 60c. The second coil end 62 is formed by laminating the second inner layer 62a and the second outer layer 62b on the second stator core end face 53b.

[0056] The second inner layer 62a and the second outer layer 62b are portions formed by the portions that cover the second tooth end face 55e and are arranged in the radial direction of the stator core 53 among the coils 60 wound around the respective teeth 55. The second inner layer 62a is along and in contact with the second tooth end face 55e. The second outer layer 62b is located on the side of the third plate 15 in the axial direction of the stator core 53 rather than the second inner layer 62a. The second outer layer 62b covers the second inner layer 62a.

[0057] In the axial direction of the stator core 53, a heat radiating member 70, which will be described later, is provided between the second inner layer 62a and the second outer layer 62b. The second inner layer 62a and the second outer layer 62b are in contact with the heat radiating member 70. Also, the second inner layer 62a and the second outer layer 62b sandwich the heat radiating member 70 in the axial direction of the stator core 53.

[0058] The coil 60 includes two side portions 63. Each side portion 63 is formed in the circumferential direction of the stator core 53 on each of the two tooth side surfaces 55c. Each side portion 63 is accommodated in the slot 56. Also, each side portion 63 is formed by a part of the first coil layer 60b and the second coil layer 60c. The first coil end 61 and the second coil end 62 are connected by each of the two side portions 63.

[0059] As shown in FIGS. 2 and 3, the stator core 53 includes an insulating sheet 53d. The insulating sheet 53d insulates the stator core 53 and the coil 60 in the circumferential direction of the stator core 53.

[0060] <Heat dissipation member> As shown in FIGS. 1 to 3, the rotating electrical machine 50 includes a plurality of heat dissipation members 70. Hereinafter, among the plurality of heat dissipation members 70, one heat dissipation member 70 will be focused on. The description of the heat dissipation member 70 hereinafter is the same for the other heat dissipation members 70 included in the rotating electrical machine 50.

[0061] The heat dissipation member 70 is made of resin. For example, the heat dissipation member 70 is formed of an epoxy resin or a silicone resin. As shown in FIG. 3, the heat dissipation member 70 is in the shape of a long plate. The heat dissipation member 70 has a first heat dissipation surface 71a as a first surface on one of the end faces in the plate thickness direction, and a second heat dissipation surface 71b as a second surface on the other. That is, the heat dissipation member 70 has a second heat dissipation surface 71b on the side opposite to the first heat dissipation surface 71a in the axial direction of the stator core 53. Each of the first heat dissipation surface 71a and the second heat dissipation surface 71b is in the shape of a flat surface. The heat dissipation member 70 has a heat dissipation base end portion 72a on one of the end portions in the longitudinal direction, and a heat dissipation tip end portion 72b on the other. Also, the heat dissipation member 70 has side surfaces 71d on both end faces in the short hand direction.

[0062] As shown in FIGS. 1 and 3, the heat radiating member 70 is provided at each of the first coil end 61 and the second coil end 62. In other words, a plate-like heat radiating member 70 is provided at the first coil end 61 and the second coil end 62. The heat radiating member 70 is provided such that the thickness direction of the heat radiating member 70 coincides with the axial direction of the stator core 53. Further, the heat radiating member 70 is provided such that the longitudinal direction of the heat radiating member 70 coincides with the extending direction of the teeth 55.

[0063] The heat radiating member 70 provided at the first coil end 61 is located at a position where the first heat radiating surface 71a and the first inner layer 61a face each other in the axial direction of the stator core 53. The first heat radiating surface 71a is located at a position facing the first stator core end face 53a through the first inner layer 61a in the axial direction of the stator core 53. In the heat radiating member 70 provided at the first coil end 61, a part of the first heat radiating surface 71a is in contact with the facing first inner layer 61a. Further, the heat radiating member 70 provided at the first coil end 61 is located at a position where the second heat radiating surface 71b and the first outer layer 61b face each other in the axial direction of the stator core 53, and a part of the second heat radiating surface 71b is in contact with the facing first outer layer 61b. That is, the first coil end 61 has a first inner layer 61a provided between the stator core 53 and the heat radiating member 70. Further, the first coil end 61 has a first outer layer 61b provided on the outer peripheral side of the first inner layer 61a with the heat radiating member 70 interposed therebetween.

[0064] As shown in FIG. 3, in the first coil end 61, a gap 60a is formed by a heat dissipation member 70 between the first inner layer 61a and the first outer layer 61b. The gap 60a is formed between the outer surface of the first inner layer 61a, the inner surface of the first outer layer 61b, and the side surface 71d of the heat dissipation member 70. The gap 60a is formed on both sides in the short side direction of the heat dissipation member 70. The gap 60a penetrates the first coil end 61 in the radial direction of the stator core 53. The gap 60a opens on the radially inner side of the first coil end 61 and opens toward the motor housing 16 on the radially outer side of the first coil end 61. Therefore, the gap 60a connects the radially inner side and the radially outer side of the first coil end 61.

[0065] Note that also in the second coil end 62 not shown in FIG. 3, similarly to the first coil end 61, a gap 60a formed by the heat dissipation member 70 is formed between the second inner layer 62a and the second outer layer 62b.

[0066] As shown in FIG. 1, the heat dissipation member 70 provided in the second coil end 62 is at a position where the first heat dissipation surface 71a and the second inner layer 62a face each other in the axial direction of the stator core 53. In other words, the first heat dissipation surface 71a is at a position facing the second stator core end face 53b through the second inner layer 62a in the axial direction of the stator core 53. In the heat dissipation member 70 provided in the second coil end 62, a part of the first heat dissipation surface 71a is in contact with the facing second inner layer 62a. Also, the heat dissipation member 70 provided in the second coil end 62 is at a position where the second heat dissipation surface 71b and the second outer layer 62b face each other in the axial direction of the stator core 53, and a part of the second heat dissipation surface 71b is in contact with the facing second outer layer 62b. That is, the second coil end 62 has a second inner layer 62a provided between the stator core 53 and the heat dissipation member 70. Also, the second coil end 62 has a second outer layer 62b provided on the outer peripheral side of the second inner layer 62a with the heat dissipation member 70 interposed therebetween.

[0067] Therefore, the heat radiating member 70 has a first heat radiating surface 71a facing the stator core 53 in the axial direction of the stator core 53. Further, the heat radiating member 70 has a second heat radiating surface 71b on the side opposite to the first heat radiating surface 71a in the axial direction of the stator core 53.

[0068] In each of the first coil end 61 and the second coil end 62, the direction from the heat radiating base end portion 72a toward the heat radiating tip end portion 72b and the direction from the tooth base end portion 55a toward the tooth tip end portion 55b are the same. That is, the heat radiating member 70 has the heat radiating tip end portion 72b at the inner end in the radial direction of the yoke 54 and the heat radiating base end portion 72a at the outer end in the radial direction of the yoke 54 among the ends in the radial direction of the yoke 54.

[0069] As shown in FIGS. 1, 2, and 3, the heat radiating member 70 has exposed end portions 72c exposed from each of the first coil end 61 and the second coil end 62. In the present embodiment, the heat radiating member 70 provided at the first coil end 61 exposes each of the heat radiating base end portion 72a and the heat radiating tip end portion 72b in the radial direction of the stator core 53. Therefore, in the present embodiment, the exposed end portion 72c of the heat radiating member 70 provided at the first coil end 61 is both the heat radiating base end portion 72a and the heat radiating tip end portion 72b.

[0070] In the present embodiment, the heat radiating member 70 provided at the second coil end 62 exposes each of the heat radiating base end portion 72a and the heat radiating tip end portion 72b in the radial direction of the stator core 53. Therefore, in the present embodiment, the exposed end portion 72c of the heat radiating member 70 provided at the second coil end 62 is both the heat radiating base end portion 72a and the heat radiating tip end portion 72b.

[0071] As shown in FIG. 1, the heat radiating member 70 is in contact with the motor housing 16 at the heat radiating base end portion 72a. In other words, the heat radiating base end portion 72a is in contact with the inner peripheral surface 16a of the motor housing 16 of the motor housing 16. That is, the heat radiating member 70 has a contact surface 75 that contacts the motor housing 16. At the heat radiating base end portion 72a, the contact surface 75 is a curved surface along the inner peripheral surface 16a of the motor housing. That is, the heat radiating member 70 has a contact surface 75 that engages with the inner peripheral surface 16a of the motor housing, and is in contact with the inner peripheral surface 16a of the motor housing by the contact surface 75.

[0072] As shown in FIGS. 2 and 3, the heat radiating member 70 has an inclined surface 73 at the heat radiating tip portion 72b. The inclined surface 73 is formed on the second heat radiating surface 71b. The inclined surface 73 is formed as it goes from the heat radiating base end portion 72a toward the heat radiating tip portion 72b and the plate thickness of the heat radiating member 70 decreases. In other words, the second heat radiating surface 71b has an inclined surface 73 whose plate thickness gradually becomes thinner as it approaches the rotation axis 20. As shown in FIGS. 1, 2, and 3, the gradient of the inclined surface 73 is constant along the longitudinal direction of the heat radiating member 70. Note that the gradient of the inclined surface 73 may change along the longitudinal direction of the heat radiating member 70. In other words, the inclined surface 73 may be a curved surface whose gradient changes in the longitudinal direction of the heat radiating member 70.

[0073] <Method of winding coil around teeth> Using FIGS. 1 and 4, a method of winding the coil 60 around each tooth 55 will be described. FIG. 4 shows the first tooth end face 55d side among the end faces that each tooth 55 has in the axial direction of the stator core 53.

[0074] As shown in FIG. 4, the coil 60 is formed by inserting each tooth 55 into a first coil layer 60b and a second coil layer 60c that are previously formed in an annular shape. The coil 60 is formed in a state including a first coil layer 60b including a first inner layer 61a and a second inner layer 62a, and a second coil layer 60c including a first outer layer 61b and a second outer layer 62b.

[0075] By an inserter (not shown), the first coil layer 60b is pushed radially outward of the stator core 53 within the stator core insertion hole 53c shown in FIG. 1. As a result, each tooth 55 is inserted into the first coil layer 60b. After the first coil layer 60b is mounted on each tooth 55, a heat dissipation member 70 is placed on the first inner layer 61a and the second inner layer 62a. The heat dissipation member 70 is placed such that the heat dissipation base end portion 72a is on the radially outer side of the stator core 53 and the heat dissipation tip end portion 72b is on the radially inner side of the stator core 53. Also, the heat dissipation member 70 is placed such that the first heat dissipation surface 71a is in contact with the first inner layer 61a and the second inner layer 62a.

[0076] The second coil layer 60c including the first outer layer 61b and the second outer layer 62b is mounted by being pushed by an inserter onto each tooth 55 on which the heat dissipation member 70 is placed. As shown in FIG. 4, when mounting the second coil layer 60c, the second coil layer 60c is mounted on each tooth 55 along the inclined surface 73. That is, the inclined surface 73 guides the second coil layer 60c to the second heat dissipation surface 71b.

[0077] <Operation of Rotating Electric Machine and Electric Compressor> The rotating shaft 20 rotates integrally with the rotor 51 when a current flows through the coil 60 from a battery (not shown). The rotating electric machine 50 rotates the first impeller 21 and the second impeller 22 via the rotating shaft 20.

[0078] The air inhaled into the first impeller chamber 31 through the first suction port 11a is sent into the first diffuser flow path 33 while being accelerated by the rotation of the first impeller 21. The air sent into the first diffuser flow path 33 is pressurized by passing through the first diffuser flow path 33. Then, the air that has passed through the first diffuser flow path 33 is discharged into the first discharge chamber 32. The air discharged into the first discharge chamber 32 is discharged into the first discharge passage 34. The air discharged into the first discharge passage 34 is inhaled into the second impeller chamber 35 through the connection pipe 45 and the second suction port 12a. The air inhaled into the second impeller chamber 35 is sent into the second diffuser flow path 37 while being accelerated by the rotation of the second impeller 22. The air sent into the second diffuser flow path 37 is pressurized by passing through the second diffuser flow path 37. Then, the air that has passed through the second diffuser flow path 37 is discharged into the second discharge chamber 36. The air discharged into the second discharge chamber 36 is discharged into the second discharge passage 38. The air discharged into the second discharge passage 38 is supplied to the fuel cell stack 42 through the supply pipe 41. Therefore, the electric compressor 100 supplies air to the fuel cell stack 42. The oxygen contained in the air supplied to the fuel cell stack 42 contributes to the power generation of the fuel cell stack 42.

[0079] A part of the air discharged into the second discharge passage 38 and flowing into the supply pipe 41 flows into the branch pipe 43 before reaching the fuel cell stack 42. The air flowing through the branch pipe 43 is cooled by the intercooler 44. In other words, the intercooler 44 cools a part of the air compressed by the compression mechanism 27. As a result, the air that has passed through the intercooler 44 becomes a lower temperature than the air discharged into the second discharge chamber 36.

[0080] The air cooled by the intercooler 44 is introduced into the motor chamber 16c from the introduction passage 13b and the first plate insertion hole 13a. In other words, the introduction passage 13b introduces a part of the air compressed by the compression mechanism 27 into the motor chamber 16c. The cooled air is introduced into the motor chamber 16c and cools the first bearing 23 and the rotating electric machine 50.

[0081] The air that cools the rotating electric machine 50 in the motor chamber 16c cools the second bearing 24. After passing through the third plate insertion hole 15a, the air passes through the discharge passage 15b and is discharged to the outside of the electric compressor 100. In other words, the discharge passage 15b discharges the air introduced into the motor chamber 16c through the introduction passage 13b from the motor chamber 16c. As described above, the intercooler 44, the introduction passage 13b, and the discharge passage 15b constitute the compressor cooling circuit 40. The compressor cooling circuit 40 is provided in the housing 10.

[0082] [Operation of the First Embodiment] The operation of the first embodiment will be described. A current flows through the coil 60 of the rotating electric machine 50 from a battery (not shown). When a current flows through the coil 60, heat is generated in the coil 60 due to the electrical resistance of the coil 60. The heat generated in the coil 60 is dissipated by the heat dissipation members 70 provided at the first coil end 61 and the second coil end 62. Further, the heat generated at the first coil end 61 and the second coil end 62 is dissipated to the outside of the coil 60 through the air gap 60a.

[0083] [Effects of the First Embodiment] The effects of the first embodiment will be described. (1-1) The heat dissipation member 70 dissipates the heat of the coil 60 transmitted through each of the first inner layer 61a and the first outer layer 61b at the first coil end 61. Also, the heat dissipation member 70 dissipates the heat of the coil 60 transmitted through each of the second inner layer 62a and the second outer layer 62b at the second coil end 62. That is, the rotating electric machine 50 dissipates heat from between the first inner layer 61a and the first outer layer 61b and between the second inner layer 62a and the second outer layer 62b by the heat dissipation member 70. As a result, the rotating electric machine 50 can efficiently cool between the first inner layer 61a and the first outer layer 61b and between the second inner layer 62a and the second outer layer 62b as compared with the case where the heat dissipation member 70 is not provided.

[0084] Further, a heat dissipation member 70 is provided at each of the first coil end 61 and the second coil end 62, thereby forming a gap 60a. That is, the coil 60 can dissipate heat generated between the first inner layer 61a and the first outer layer 61b and between the second inner layer 62a and the second outer layer 62b through the gap 60a. Therefore, the rotating electrical machine 50 can cool the coil 60 by forming the gap 60a with the heat dissipation member 70.

[0085] (1-2) As a method of winding the coil 60 around each tooth 55 in concentrated winding, there is a method in which the coil 60 is pre-formed in a wound state and then the formed coil 60 is inserted into each tooth 55. In this case, the inclined surface 73 functions as a surface for guiding the insertion of the formed coil 60. As a result, compared with the case where the heat dissipation member 70 does not have the inclined surface 73, it becomes easier to manufacture the rotating electrical machine 50 having the heat dissipation member 70.

[0086] (1-3) The heat dissipation member 70 can exchange heat with each of the first coil end 61 and the second coil end 62, and can also exchange heat with the motor housing 16 through the contact surface 75. That is, the heat dissipation member 70 can conduct the heat conducted from each of the first coil end 61 and the second coil end 62 to the motor housing 16. As a result, the rotating electrical machine 50 can more efficiently cool between the first inner layer 61a and the first outer layer 61b and between the second inner layer 62a and the second outer layer 62b compared with the case where the heat dissipation member 70 is not in contact with the motor housing 16.

[0087] [Second Embodiment] Hereinafter, a second embodiment in which the rotating electrical machine is embodied will be described with reference to FIG. 5. The main difference from the first embodiment is that a heat dissipation member water channel 74 communicating with the housing water channel 16d is formed in the heat dissipation member 70. For this reason, detailed description of the same configuration as that of the first embodiment will be omitted. Although the second coil end 62 is shown in FIG. 5, the same description also holds for the first coil end 61 not shown in FIG. 5.

[0088] As shown in FIG. 5, in the second embodiment, the motor housing 16 has a housing water passage 16d formed therein, and a connection hole 16e is formed in the inner peripheral surface 16a of the motor housing. Further, the motor housing 16 is provided with a housing branch water passage 16g branching from the housing water passage 16d. The housing branch water passage 16g extends in the radial direction of the stator core 53 from the end of the housing water passage 16d in the axial direction of the stator core 53. The housing water passage 16d communicates with the motor chamber 16c via the connection hole 16e and the housing branch water passage 16g.

[0089] Inside the heat radiating member 70, a heat radiating member water passage 74 through which cooling water flows is formed. Cooling flow holes 71c are formed in the contact surface 75 of the heat radiating member 70. The heat radiating member water passage 74 and the cooling flow holes 71c communicate with each other. That is, the motor housing 16 is provided with a housing water passage 16d through which cooling water for cooling the stator 52 flows, and a housing branch water passage 16g that branches from the housing water passage 16d and opens toward the contact surface 75.

[0090] The heat radiating member 70 is provided on the stator 52 so that the connection hole 16e and the cooling flow holes 71c communicate with each other. The cooling water flowing through the heat radiating member water passage 74 cools the heat radiating member 70 and also cools each of the first coil end 61 and the second coil end 62. That is, the heat radiating member 70 is provided with a heat radiating member water passage 74 that opens to the contact surface 75 so that the cooling water for cooling the first coil end 61 and the second coil end 62 flows from the housing branch water passage 16g.

[0091] The motor housing 16 or the heat radiating member 70 includes a sealing member (not shown) that seals the space between the motor housing 16 and the heat radiating member 70. [Operation of the Second Embodiment] The operation of the second embodiment will be described.

[0092] In the rotating electric machine 50, a heat dissipation member water channel 74 and cooling flow holes 71c are formed in the heat dissipation member 70. Cooling water flowing through the housing water channel 16d flows into and out of the heat dissipation member water channel 74 through the cooling flow holes 71c and the connection holes 16e. The heat generated in the rotating electric machine 50 is conducted to the heat dissipation member 70 and then conducted to the cooling water in the heat dissipation member water channel 74. That is, the heat dissipation member 70 dissipates heat from the rotating electric machine 50 and cools the rotating electric machine 50 through the exposed end portion 72c and the cooling water flowing through the heat dissipation member water channel 74.

[0093] [Effects of the Second Embodiment] The effects of the second embodiment will be described. (2-1) The cooling water flowing through the housing water channel 16d cools the stator 52 and, by flowing through the heat dissipation member water channel 74 via the housing branch water channel 16g, cools the heat dissipation member 70. As a result, the rotating electric machine 50 can efficiently cool each of the first coil end 61 and the second coil end 62 as compared with the case where the heat dissipation member 70 is not cooled by the cooling water flowing through the heat dissipation member water channel 74.

[0094] [Modification Examples] Note that each of the above embodiments can be modified as follows. Each of the above embodiments and the following modification examples can be implemented in combination with each other within a technically non - conflicting range.

[0095] ○ The heat dissipation base end portion 72a does not have to be in contact with the inner peripheral surface 16a of the motor housing. ○ The heat dissipation member water channel 74 formed in the heat dissipation member 70 does not have to communicate with the housing water channel 16d. For example, a cooling medium supply source (not shown) may directly supply cooling water to the heat dissipation member 70 without passing through the housing 10.

[0096] ○ The heat dissipation member 70 may be provided with a plurality of cooling flow holes 71c. ○ The cooling medium flowing through the housing water channel 16d does not have to be cooling water. For example, it may be air. In this case, the air flowing through the housing water channel 16d is adjusted to be at a lower temperature than the temperature of the rotating electric machine 50.

[0097] ○ The second heat dissipation surface 71b of the heat dissipation member 70 may not be provided with the inclined surface 73. ○ The heat dissipation member 70 may be provided with only one of the heat dissipation base end portion 72a and the heat dissipation tip end portion 72b as the exposed end portion 72c at each of the first coil end 61 and the second coil end 62.

[0098] ○ The exposed end portion 72c of the heat dissipation member 70 provided at the first coil end 61 may not be an end portion in the longitudinal direction of the heat dissipation member 70. For example, the exposed end portion 72c may be exposed more than the first coil end 61 in the axial direction of the stator core 53. Specifically, a portion that bulges from the surroundings may be formed on the second heat dissipation surface 71b of the heat dissipation member 70, and the exposed end portion 72c may be formed by the bulging portion being exposed from the gap formed in the first outer layer 61b.

[0099] ○ The exposed end portion 72c of the heat dissipation member 70 provided at the second coil end 62 may not be an end portion in the longitudinal direction of the heat dissipation member 70. For example, the exposed end portion 72c may be exposed more than the second coil end 62 in the axial direction of the stator core 53. Specifically, a portion that bulges from the surroundings may be formed on the second heat dissipation surface 71b of the heat dissipation member 70, and the exposed end portion 72c may be formed by the bulging portion being exposed from the gap formed in the second outer layer 62b.

[0100] ○ The heat radiating member 70 may be provided only on either the first coil end 61 or the second coil end 62. In this case, it is preferable that the first coil end 61 is a coil end without the heat radiating member 70. The air introduced into the motor chamber 16c through the introduction passage 13b cools the first coil end 61 and then cools the second coil end 62. In other words, the heat radiating member 70 is provided on the second coil end 62 that communicates with the introduction passage 13b through the stator core insertion hole 53c of the stator core 53. The air is heated when cooling the first coil end 61. Therefore, the second coil end 62 is less likely to be cooled by the air than the first coil end 61. By providing the heat radiating member 70 on the second coil end 62 that is difficult to be cooled, the rotating electric machine 50 can cool the second coil end 62.

[0101] ○ The shape of the heat radiating member 70 is not limited to a plate shape. For example, the heat radiating member 70 may be L-shaped covering the first inner layer 61a and the side portion 63. Further, the heat radiating member 70 may be gutter-shaped covering the first inner layer 61a, the side portion 63, and the second inner layer 62a. Further, the heat radiating member 70 may be cylindrical covering the first inner layer 61a, the second inner layer 62a, and a pair of side portions 63.

[0102] ○ The heat radiating member 70 may be provided on a part of the plurality of teeth 55 instead of all of the plurality of teeth 55. ○ Each of the first coil end 61 and the second coil end 62 may be formed of three or more layers. In this case, it is preferable that the heat radiating member 70 is arranged to be alternately aligned with the layer in the axial direction of the stator core 53.

[0103] ○ The electric compressor 100 does not have to be a compressor mounted on a fuel cell vehicle. For example, the electric compressor 100 may be used as an air conditioner of the vehicle. In this case, the electric compressor 100 does not have to be connected to the fuel cell stack 42.

[0104] ○ The electric compressor 100 does not have to be a centrifugal type. For example, the electric compressor 100 may be a scroll type, a piston type, a vane type, or the like. ○ The gap 60a may be filled with the resin 80. In this case, as shown in FIGS. 6 and 7, the resin 80 covering the first inner layer 61a and the first outer layer 61b is molded on the first coil end 61. Also, in the second coil end 62, the resin 80 covering the second inner layer 62a and the second outer layer 62b is molded.

[0105] The resin 80 is molded so as to be in contact with the heat dissipation member 70 and the motor housing 16. In this case, the heat generated between the first inner layer 61a and the first outer layer 61b and between the second inner layer 62a and the second outer layer 62b is transmitted to the motor housing 16 through the heat dissipation member 70 and the resin 80. That is, the rotating electric machine 50 can dissipate heat from between the first inner layer 61a and the first outer layer 61b and between the second inner layer 62a and the second outer layer 62b more efficiently than, for example, the case where heat is transmitted to the motor housing 16 only by the heat dissipation member 70.

[0106] Also, the resin 80 can fix the heat dissipation member 70 to the first coil end 61 and the second coil end 62. [Appendix] The technical idea that can be grasped from the above embodiments and modification examples is described below.

[0107] (a) A rotating shaft, a rotating electric machine that rotates the rotating shaft, a compression mechanism that is driven as the rotating shaft rotates to compress a fluid, a compressor housing that defines a motor chamber for housing the rotating electric machine, and a compressor cooling circuit provided in the compressor housing. The rotating electric machine includes a cylindrical yoke, a stator core having a plurality of teeth extending from an inner peripheral surface of the yoke, a coil wound around each of the teeth in concentrated winding, and a housing portion that houses the stator core. Each of the teeth has a tooth end surface that is an end surface of the teeth respectively positioned in the axial direction of the stator core. The coil has a coil end that protrudes in the axial direction of the stator core more than the stator core. A heat radiating member for radiating heat of the coil is provided at the coil end. The compressor cooling circuit includes a fluid cooling device that cools a part of the fluid, an introduction passage that introduces a part of the fluid into the motor chamber, and a discharge passage that discharges a part of the fluid from the motor chamber. The heat radiating member is provided at the coil end that communicates with the introduction passage through an insertion hole of the stator core. An electric compressor.

Explanation of reference numerals

[0108] 16... Motor housing as the housing portion, 16d... Housing water passage, 16f... Housing branch water passage, 20... Rotating shaft, 50... Rotating electric machine, 51... Rotor, 52... Stator, 53... Stator core, 54... Yoke, 55... Plurality of teeth, 60... Coil, 60a... Gap, 61... First coil end as the coil end, 61a... First inner layer as the first coil end layer, 61b... First outer layer as the second coil end layer, 62... Second coil end as the coil end, 62a... Second inner layer as the first coil end layer, 62b... Second outer layer as the second coil end layer, 70... Heat radiating member, 71a... First heat radiating surface as the first surface, 71b... Second heat radiating surface as the second surface, 73... Inclined surface, 74... Heat radiating member water passage, 75... Contact surface, 80... Resin.

Claims

1. A rotating shaft, A rotor fixed to the rotating shaft and rotating integrally with the rotating shaft, A stator disposed outside the rotor, having a cylindrical yoke and a stator core having a plurality of teeth protruding from the inner peripheral surface of the yoke toward the rotor, and coils wound around each tooth in concentrated winding, A housing portion for accommodating the rotating shaft, the rotor, and the stator, the coil being a rotating electrical machine having a coil end protruding in the axial direction of the stator core from the stator core, A heat radiating member for radiating the heat of the coil is provided at the coil end, The coil end has a first coil end layer provided between the stator core and the heat radiating member, and a second coil end layer provided on the outer peripheral side of the first coil end layer with the heat radiating member interposed therebetween, A rotating electrical machine, characterized in that a gap is formed by the heat radiating member between the first coil end layer and the second coil end layer.

2. The heat radiating member is plate-shaped and has a first surface facing the stator core in the axial direction of the stator core and a second surface on the opposite side of the first surface in the axial direction of the stator core, The rotating electrical machine according to claim 1, wherein the second surface has an inclined surface whose plate thickness gradually decreases as it approaches the rotating shaft.

3. The rotating electrical machine according to claim 1 or claim 2, characterized in that the heat radiating member has a contact surface that contacts the housing portion.

4. The housing portion is provided with a housing waterway through which cooling water for cooling the stator flows, and a housing branch waterway that branches from the housing waterway and opens toward the contact surface, The rotating electrical machine according to claim 3, characterized in that the heat radiating member is provided with a heat radiating member waterway that opens to the contact surface so that cooling water for cooling the coil end flows from the housing branch waterway.

5. The rotating electrical machine according to claim 1, characterized in that a resin molded to cover the first coil end layer and the second coil end layer and contact the heat radiating member and the housing portion is molded in the gap.

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