Motor

Abstract

The present disclosure relates to a motor capable of suppressing an imbalance in the flow rate of a cooling liquid between a plurality of individual flow paths. A motor is provided with: a stator which is disposed such that the central axis intersects the vertical direction; an annular coolant flow path provided along an end surface of the stator and having an annular shape extending around the central axis; and a plurality of individual flow paths, each of which is connected to the annular cooling liquid flow path, and through which the cooling liquid supplied from the annular cooling liquid flow path flows. The annular cooling liquid flow path has a partition structure that partitions the annular cooling liquid flow path into an upper flow path and a lower flow path located below the upper flow path. The plurality of individual flow paths include a plurality of upper individual flow paths connected to the upper flow path and a plurality of lower individual flow paths connected to the lower flow path.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Japanese Patent Application No. 2023-197376 filed on November 21, 2023. The entire contents of the priority application are incorporated by reference into this application. Technical Field

[0003] The technology disclosed in this specification relates to a motor. Background Art

[0004] The motor disclosed in Japanese Patent Publication No. 2017-204980 has an annular coolant flow path arranged along the end surface of the stator. The annular coolant flow path has an annular shape extending around the central axis of the stator. In addition, the motor has a plurality of stator internal coolant flow paths arranged inside the stator. Each stator internal coolant flow path is connected to the annular coolant flow path. The coolant flows from the annular coolant flow path to each stator internal coolant flow path. The motor is cooled by the coolant. Summary of the invention

[0005] Problems to be solved by the invention

[0006] In Japanese Patent Publication No. 2017-204980, the coolant flow path in the stator is connected to the annular coolant flow path. In addition, in other motors, other flow paths (such as a flow path that discharges coolant toward the coil end of the stator) are sometimes connected to the annular coolant flow path. Hereinafter, multiple flow paths branching from the annular coolant flow path are referred to as separate flow paths.

[0007] If the center axis of the motor is arranged in a direction that intersects the vertical direction (for example, the center axis of the motor is arranged in a horizontal direction), a height difference will be generated inside the annular coolant flow path. In this case, the pressure becomes higher in the lower part of the annular coolant flow path than in the upper part of the annular coolant flow path. Therefore, more coolant flows to the separate flow path connected to the lower part of the annular coolant flow path than to the separate flow path connected to the upper part of the annular coolant flow path. In this way, if the flow rate of the coolant is unbalanced between multiple separate flow paths, the motor cannot be cooled efficiently. In this specification, a technology that can suppress the imbalance of the flow rate of the coolant between multiple separate flow paths is proposed.

[0008] Means for solving problems

[0009] The motor of structure 1 disclosed in this specification has: a stator, which is configured so that the central axis intersects the vertical direction; an annular coolant flow path, which is arranged along the end surface of the stator and has an annular shape extending around the central axis; and a plurality of separate flow paths, which are respectively connected to the annular coolant flow path and through which the coolant supplied from the annular coolant flow path flows. The annular coolant flow path has a dividing structure, which divides the annular coolant flow path into an upper flow path and a lower flow path located below the upper flow path. The plurality of separate flow paths have a plurality of upper separate flow paths connected to the upper flow path and a plurality of lower separate flow paths connected to the lower flow path.

[0010] Furthermore, the entire lower flow path may be arranged below the lower end of the upper flow path, or a portion of the lower flow path may be arranged below the lower end of the upper flow path.

[0011] In addition, the partition structure is a structure for partitioning the upper flow path and the lower flow path in a manner that suppresses the interaction of pressures between the upper flow path and the lower flow path. The partition structure can completely separate the upper flow path from the lower flow path, or the upper flow path and the lower flow path can be partially connected in the partition structure.

[0012] In this motor, the annular coolant flow path is divided into an upper flow path and a lower flow path by a partition structure. Therefore, it is difficult for pressure to be applied from the upper flow path to the lower flow path, and the pressure of the lower flow path is difficult to increase. Therefore, the coolant is easy to flow evenly in the separate flow path connected to the upper flow path and the separate flow path connected to the lower flow path. In this way, according to this motor, it is possible to suppress the imbalance of the flow rate of the coolant between the multiple separate flow paths. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an exploded perspective view of the motor of Example 1.

[0014] Figure 2 This is a cross-sectional view of the motor of Example 1 (a view cut along the axial direction).

[0015] Figure 3 This is a perspective view of the stator core of Example 1.

[0016] Figure 4 This is a top view of the stator of Example 1 observed along the axial direction.

[0017] Figure 5 This is a diagram showing the internal structure of the guide ring of Example 1 (viewed along the axial direction).

[0018] Figure 6 This is a diagram showing the internal structure of the guide ring according to Modification 1.

[0019] Figure 7 This is a diagram showing the internal structure of the guide ring of Example 2.

[0020] Figure 8 This is a diagram showing the internal structure of the guide ring of Example 3.

[0021] Fig. 9 It is a cross-sectional view of the motor of Example 4.

[0022] Fig.10 This is a diagram showing the internal structure of the guide ring of Example 4.

[0023] Fig.11 This is a diagram showing the internal structure of the guide ring of Modification 2.

[0024] Fig.12 This is a diagram showing the internal structure of the guide ring of Example 5.

[0025] Fig.13 This is a diagram showing the internal structure of the guide ring of Example 6.

[0026] Fig.14 This is a diagram showing the internal structure of the guide ring of Example 7.

[0027] Fig.15 This is a diagram showing the internal structure of the guide ring of Example 8.

[0028] Fig.16 This is a cross-sectional view of a motor according to Modification 3.

[0029] Fig.17 It is a cross-sectional view of the motor of Modification 4. DETAILED DESCRIPTION

[0030] After the above-mentioned structure 1, the additional structure of the vehicle disclosed in this specification will be described below.

[0031] (Structure 2)

[0032] According to the motor described in structure 1, wherein the dividing structure is a partition wall separating the upper flow path from the lower flow path, the motor also has an upper coolant supply flow path that supplies coolant to the upper flow path and a lower coolant supply flow path that supplies coolant to the lower flow path.

[0033] (Structure 3)

[0034] According to the motor according to configuration 1, the partition structure is a partial partition wall that reduces the cross-section of the annular coolant flow path, and the motor further includes a coolant supply flow path that supplies coolant to the upper flow path.

[0035] (Structure 4)

[0036] According to the motor described in structure 1, wherein the dividing structure is a check valve, which allows the coolant to flow from the upper flow path to the lower flow path and prevents the coolant from flowing from the lower flow path to the upper flow path, and the motor also has a coolant supply flow path that supplies coolant to the upper flow path.

[0037] (Structure 5)

[0038] A motor according to any one of structures 1 to 4, wherein the motor also has a coil, the coil is wound around the stator and has a coil end arranged on the inner periphery of the annular coolant flow path, and the multiple separate flow paths have multiple coolant discharge flow paths for discharging coolant toward the coil end.

[0039] (Structure 6)

[0040] The electric motor according to any one of Structures 1 to 5, wherein the plurality of individual flow paths include a plurality of stator internal coolant flow paths provided inside the stator.

[0041] (Structure 7)

[0042] A motor, wherein the motor comprises: a stator, the stator being configured so that a central axis intersects a vertical direction; an annular coolant flow path, the annular coolant flow path being provided along an end surface of the stator and having an annular shape extending around the central axis; a coil, the coil being wound around the stator and having a coil end provided at an inner peripheral portion of the annular coolant flow path; and a plurality of coolant discharge flow paths, the plurality of coolant discharge flow paths being respectively connected to the annular coolant flow path to discharge coolant supplied from the annular coolant flow path toward the coil end, the total value of the cross-sectional area of ​​the coolant discharge flow paths connected to the annular coolant flow path at a position above the central position in the up-down direction of the annular coolant flow path being greater than the total value of the cross-sectional area of ​​the coolant discharge flow paths connected to the annular coolant flow path at a position below the central position.

[0043] (Structure 8)

[0044] According to the motor described in structure 7, the motor also has a plurality of stator internal coolant flow paths, the plurality of stator internal coolant flow paths are respectively arranged inside the stator, and are respectively connected to the annular coolant flow path, for the flow of coolant supplied from the annular coolant flow path, and the total value of the cross-sectional area of ​​the stator internal coolant flow paths connected to the annular coolant flow path at a position above the center position is greater than the total value of the cross-sectional area of ​​the stator internal coolant flow paths connected to the annular coolant flow path at a position below the center position.

[0045] In the motor of structure 8, the total value of the cross-sectional area of ​​the coolant discharge flow path connected to the annular coolant flow path at the upper side is larger than the total value of the cross-sectional area of ​​the coolant discharge flow path connected to the annular coolant flow path at a position lower than the center position. Therefore, even if the pressure of the annular coolant flow path becomes higher at a position lower than the upper side, the coolant can easily flow evenly to each coolant discharge flow path.

[0046] In the motor of structure 9, the total value of the cross-sectional area of ​​the stator internal coolant flow path connected to the annular coolant flow path at the upper side is larger than the total value of the cross-sectional area of ​​the stator internal coolant flow path connected to the annular coolant flow path at a position lower than the center position. Therefore, even if the pressure of the annular coolant flow path becomes higher at a position lower than the upper side, the coolant can easily flow evenly to each stator internal coolant flow path.

[0047] In addition, in structures 7 and 8, the "cross-sectional area" refers to the cross-sectional area at the narrowest position of each flow path. For example, when the cross-sectional area of ​​a specific flow path changes depending on the position of the flow direction, the minimum value of the cross-sectional area of ​​the flow path corresponds to the "cross-sectional area" in structures 7 and 8.

[0048] Example 1

[0049] Figure 1 , 2 The motor 10 of the illustrated embodiment 1 has a rotor 20, a stator 30 and a housing 50. The rotor 20 has a shaft 24. The stator 30 has a cylindrical shape. The rotor 20 is arranged in the center hole of the stator 30 in such a manner that the center axis of the shaft 24 coincides with the center axis AX of the stator 30. The rotor 20 and the stator 30 are housed in the housing 50. The stator 30 is fastened to the housing 50 by bolts 49. Hereinafter, the direction parallel to the center axis AX is referred to as the axial direction, the direction along the radius of a circle centered on the center axis AX is referred to as the radial direction, and the direction along the circumference of a circle centered on the center axis AX is referred to as the circumferential direction. In addition, Figure 2 The arrow UP in FIG. 1 shows the upper side in the vertical direction. The motor 10 is arranged in a direction such that the central axis AX intersects with the upward direction UP. Figure 2 In the example, the central axis AX is perpendicular to the upward direction UP. Figure 2 In the embodiment, the central axis AX is configured horizontally. In other examples, the central axis AX may be inclined relative to the horizontal plane.

[0050] like Figure 1 , 2 As shown, the housing 50 has a so-called bottomed cylindrical shape and has an outer peripheral wall 52 and a side wall 54. The outer peripheral wall 52 has a cylindrical shape. The side wall 54 is provided at one end portion in the axial direction of the outer peripheral wall 52. A through hole 54a is provided at the center of the side wall 54.

[0051] The stator 30 has a stator core 32 and a coil 40. Figure 2 The coil 40 is shown in a simplified manner. The stator core 32 has a cylindrical shape. Figure 3 As shown, the stator core 32 is composed of a plurality of electromagnetic steel plates 36 stacked in the axial direction. The stator core 32 has a back yoke 33 and a plurality of teeth 34. The back yoke 33 has a cylindrical shape. Each tooth 34 protrudes from the inner circumferential surface of the back yoke 33. That is, each tooth 34 protrudes radially inward from the back yoke 33. Each tooth 34 extends in the axial direction. The plurality of teeth 34 are arranged at intervals in the circumferential direction. The coil 40 is wound around each tooth 34. The stator core 32 has an end face 32a and an end face 32b. The end face 32a is an end face on one side of the stator core 32 in the axial direction, and the end face 32b is an end face on the side opposite to the end face 32a. As shown in FIG. Figure 2 As shown, the coil end 42a is provided on the end surface 32a. The coil end 42b is provided on the end surface 32b. The coil ends 42a and 42b are bent portions of the coil 40 wound around the stator core 32. The coil end 42a protrudes from the end surface 32a, and the coil end 42b protrudes from the end surface 32b. Figure 4 As shown, the coil ends 42a are distributed in a ring shape on the end surface 32a. Similarly, the coil ends 42b are distributed in a ring shape on the end surface 32b.

[0052] like Figure 1 , 2 As shown, the side wall 54 of the housing 50 faces the end surface 32a of the stator core 32. A gap is provided between the side wall 54 and the end surface 32a of the stator core 32, and the coil end 42a is arranged in the gap.

[0053] The rotor 20 is disposed in the center hole of the stator core 32 in a state of being concentric with the stator core 32. The shaft 24 of the rotor 20 passes through the through hole 54a of the housing 50. The rotor 20 is rotatably supported in the housing 50 by bearings or the like.

[0054] like Figure 1 , 2 As shown, the motor 10 has a guide ring 60. The guide ring 60 has an annular shape. The guide ring 60 is housed in the housing 50. The guide ring 60 is configured to extend in an annular shape around the central axis AX of the stator 30. The guide ring 60 is arranged between the end face 32a of the stator core 32 and the side wall 54 of the housing 50 in a state concentric with the stator core 32. The guide ring 60 is fixed to the end face 32a. An annular coolant flow path 62 is provided in the guide ring 60. The annular coolant flow path 62 extends along the end face 32a of the stator core 32. As shown in FIG. Figure 4As shown, the annular coolant flow path 62 has an annular shape extending around the central axis AX of the stator. The coil end 42a is arranged radially inside the guide ring 60 (ie, the annular coolant flow path 62).

[0055] When the motor 10 is in operation, the coolant flows into the coolant flow path including the annular coolant flow path 62, and the motor 10 is cooled. In this embodiment, the coolant is cooling oil. The cooling oil functions as a coolant for cooling the motor 10 and as a lubricating oil for lubricating the rotor 20.

[0056] like Figure 2 , 5 As shown, in Embodiment 1, a plurality of coolant discharge passages 68 are provided in the guide ring 60. Each coolant discharge passage 68 is provided on a wall constituting the inner circumference of the guide ring 60. That is, each coolant discharge passage 68 extends from the annular coolant passage 62 to the inner circumference of the guide ring 60. The plurality of coolant discharge passages 68 are provided at substantially equal angular intervals in the circumferential direction. Figure 5 As shown by the arrows in , each coolant discharge flow path 68 discharges the coolant in the annular coolant flow path 62 toward the inside of the guide ring 60. As described above, the coil end 42a is arranged inside the guide ring 60. Therefore, each coolant discharge flow path 68 discharges the coolant toward the coil end 42a.

[0057] like Figure 5 As shown, partitions 64a and 64b are provided inside the annular coolant flow path 62. The annular coolant flow path 62 is divided into an upper flow path 62a and a lower flow path 62b by the partitions 64a and 64b. A plurality of coolant discharge flow paths 68 are connected to the upper flow path 62a and the lower flow path 62b, respectively.

[0058] like Figure 2 , 5 As shown, the guide ring 60 is connected to an upper coolant supply flow path 66a and a lower coolant supply flow path 66b. The upper coolant supply flow path 66a connects the outside of the housing 50 to the upper flow path 62a. The lower coolant supply flow path 66b connects the outside of the housing 50 to the lower flow path 62b. Figure 2 As shown, a coolant discharge path 53b is provided at the lower portion of the housing 50. The coolant discharge path 53b connects the inside of the housing 50 with the outside.

[0059] When the motor 10 is working, the coolant is supplied to the upper coolant supply flow path 66a and the lower coolant supply flow path 66b by a pump (not shown). The coolant flows from the upper coolant supply flow path 66a into the upper flow path 62a, and the coolant flows from the lower coolant supply flow path 66b into the lower flow path 62b. The coolant in the upper flow path 62a is discharged toward the coil end 42a via the coolant discharge flow path 68, and the coolant in the lower flow path 62b is discharged toward the coil end 42a via the coolant discharge flow path 68. The coolant discharged toward the coil end 42a flows into the housing 50 and is discharged to the outside of the housing 50 from the coolant discharge path 53b. The coolant discharged from the coolant discharge path 53b is supplied again to the upper coolant supply flow path 66a and the lower coolant supply flow path 66b by a pump. In this way, the motor 10 is cooled by circulating the coolant.

[0060] In Embodiment 1, since the lower flow path 62b is separated from the upper flow path 62a by the partition walls 64a and 64b, the pressure in the upper flow path 62a is independent of the pressure in the lower flow path 62b. Therefore, it is possible to prevent the pressure in the lower flow path 62b from becoming extremely high relative to the pressure in the upper flow path 62a. Therefore, it is possible to suppress the imbalance between the flow rate of the coolant flowing to the coolant discharge flow path 68 provided in the upper flow path 62a and the flow rate of the coolant flowing to the coolant discharge flow path 68 provided in the lower flow path 62b. Therefore, according to Embodiment 1, the coil end 42a can be evenly cooled.

[0061] In the first embodiment, the partition wall 64a and the partition wall 64b are arranged at the same height. Figure 6 As illustrated, the partition wall 64a and the partition wall 64b may be arranged at different heights.

[0062] Example 2

[0063] In the second embodiment, the partition structure for partitioning the upper flow path 62a and the lower flow path 62b and the cooling liquid supply flow path are different from those of the first embodiment. The other structures of the second embodiment are the same as those of the first embodiment.

[0064] like Figure 7As shown, in Example 2, the upper flow path 62a and the lower flow path 62b are divided by partial partitions 64c and 64d. The partial partition 64c partially blocks the annular coolant flow path 62, and a micro-flow path 64e is arranged next to the partial partition 64c. The micro-flow path 64e connects the upper flow path 62a with the lower flow path 62b. The cross-sectional area of ​​the micro-flow path 64e is smaller than the cross-sectional area of ​​the upper flow path 62a and the cross-sectional area of ​​the lower flow path 62b. That is, the partial partition 64c reduces the cross-sectional area of ​​the annular coolant flow path 62. The partial partition 64c can also be a throttling mechanism such as a throttling hole. Similar to the partial partition 64c, the partial partition 64d also partially blocks the annular coolant flow path 62, and a micro-flow path 64f is arranged next to the partial partition 64d. The micro-flow path 64f connects the upper flow path 62a with the lower flow path 62b. The cross-sectional area of ​​the minute flow path 64f is smaller than the cross-sectional area of ​​the upper flow path 62a and the cross-sectional area of ​​the lower flow path 62b.

[0065] In Example 2, the upper coolant supply flow path 66a connected to the upper flow path 62a is provided similarly to Example 1. On the other hand, in Example 2, the lower coolant supply flow path 66b connected to the lower flow path 62b is not provided.

[0066] When the motor of Example 2 is working, the coolant is supplied to the upper flow path 62a via the upper coolant supply flow path 66a by a pump not shown. Since micro-flow paths 64e and 64f are provided next to the partial partition walls 64c and 64d, the coolant flows from the upper flow path 62a to the lower flow path 62b via the micro-flow paths 64e and 64f. The coolant in the upper flow path 62a is discharged toward the coil end 42a via the coolant discharge flow path 68, and the coolant in the lower flow path 62b is discharged toward the coil end 42a via the coolant discharge flow path 68. Since the upper flow path 62a and the lower flow path 62b are divided by the partial partition walls 64c and 64d, the pressure applied from the upper flow path 62a to the lower flow path 62b is weakened. Therefore, it is possible to prevent the pressure in the lower flow path 62b from becoming extremely high relative to the pressure in the upper flow path 62a. Therefore, the imbalance between the flow rate of the coolant flowing to the coolant discharge flow path 68 provided in the upper flow path 62a and the flow rate of the coolant flowing to the coolant discharge flow path 68 provided in the lower flow path 62b can be suppressed. Therefore, according to the second embodiment, the coil end 42a can be cooled uniformly.

[0067] Example 3

[0068] In the third embodiment, the partition structure for partitioning the upper flow path 62a and the lower flow path 62b and the cooling liquid supply flow path are different from those of the first embodiment. The other structures of the third embodiment are the same as those of the first embodiment.

[0069] like Figure 8As shown, in Embodiment 3, the upper flow path 62a and the lower flow path 62b are divided by check valves 64g and 64h. The check valves 64g and 64h allow the coolant to flow from the upper flow path 62a to the lower flow path 62b, and prevent the coolant from flowing from the lower flow path 62b to the upper flow path 62a, respectively.

[0070] In Example 3, similarly to Example 2, an upper coolant supply flow path 66a connected to the upper flow path 62a is provided, but a lower coolant supply flow path 66b connected to the lower flow path 62b is not provided.

[0071] When the motor of Example 3 is working, a pump (not shown) is used to supply the coolant to the upper flow path 62a via the upper coolant supply flow path 66a. The coolant flows from the upper flow path 62a to the lower flow path 62b via the check valves 64g and 64h. The coolant in the upper flow path 62a is discharged toward the coil end 42a via the coolant discharge flow path 68, and the coolant in the lower flow path 62b is discharged toward the coil end 42a via the coolant discharge flow path 68. Since the upper flow path 62a and the lower flow path 62b are divided by the check valves 64g and 64h, the pressure applied from the upper flow path 62a to the lower flow path 62b is weakened. Therefore, it is possible to prevent the pressure in the lower flow path 62b from becoming extremely high relative to the pressure in the upper flow path 62a. Therefore, the imbalance between the flow rate of the coolant flowing to the coolant discharge flow path 68 provided in the upper flow path 62a and the flow rate of the coolant flowing to the coolant discharge flow path 68 provided in the lower flow path 62b can be suppressed. Therefore, according to the third embodiment, the coil end 42a can be cooled uniformly.

[0072] In Examples 1 to 3, the coolant discharge flow path 68 is an example of a separate flow path. More specifically, the coolant discharge flow path 68 connected to the upper flow path 62a is an example of an upper separate flow path, and the coolant discharge flow path 68 connected to the lower flow path 62b is an example of a lower separate flow path.

[0073] Example 4

[0074] like Fig. 9 , 10 As shown, in the fourth embodiment, the motor does not have a coolant discharge flow path 68, but instead has a plurality of stator internal coolant flow paths 70. The other structures of the fourth embodiment are the same as those of the first embodiment. Each stator internal coolant flow path 70 is arranged inside the stator core 32. Fig. 9 As shown, each stator inner coolant flow path 70 extends axially from one end surface 32a of the stator core 32 to the other end surface 32b. The upstream end of each stator inner coolant flow path 70 is connected to the annular coolant flow path 62. The downstream end of each stator inner coolant flow path 70 opens at the end surface 32b. Fig.10As shown, the upstream ends of the stator internal coolant flow paths 70 are arranged at equal angular intervals in the circumferential direction. A plurality of stator internal coolant flow paths 70 are connected to the upper flow path 62a, and a plurality of stator internal coolant flow paths 70 are connected to the lower flow path 62b.

[0075] When the motor of Example 4 is operating, a pump (not shown) is used to supply coolant to the upper coolant supply flow path 66a and the lower coolant supply flow path 66b. The coolant flows from the upper coolant supply flow path 66a into the upper flow path 62a, and the coolant flows from the lower coolant supply flow path 66b into the lower flow path 62b. The coolant in the upper flow path 62a flows in the stator internal coolant flow path 70 and is discharged from its downstream end (i.e., the end surface 32b). The coolant in the lower flow path 62b flows in the stator internal coolant flow path 70 and is discharged from its downstream end (i.e., the end surface 32b). The stator core 32 is cooled from the inside by the coolant flowing in each stator internal coolant flow path 70. The coolant discharged from the downstream end of each stator internal coolant flow path 70 flows in the housing 50 and is discharged to the outside of the housing 50 from the coolant discharge path 53b. The coolant discharged from the coolant discharge path 53b is supplied again to the upper coolant supply flow path 66a and the lower coolant supply flow path 66b by a pump. In this way, the motor 10 is cooled by circulating the coolant.

[0076] In the fourth embodiment, since the lower flow path 62b is separated from the upper flow path 62a by the partitions 64a and 64b, the pressure in the upper flow path 62a is independent of the pressure in the lower flow path 62b. Therefore, it is possible to prevent the pressure in the lower flow path 62b from becoming extremely high relative to the pressure in the upper flow path 62a. Therefore, it is possible to suppress the imbalance between the flow rate of the coolant flowing to the stator internal coolant flow path 70 connected to the upper flow path 62a and the flow rate of the coolant flowing to the stator internal coolant flow path 70 connected to the lower flow path 62b. Therefore, according to the fourth embodiment, the stator core 32 can be uniformly cooled.

[0077] In Example 4, the stator inner coolant flow path 70 is an example of a separate flow path. More specifically, the stator inner coolant flow path 70 connected to the upper flow path 62a is an example of an upper separate flow path, and the stator inner coolant flow path 70 connected to the lower flow path 62b is an example of a lower separate flow path.

[0078] In addition, in Example 4 (i.e. Fig.10 ), the upper flow path 62a and the lower flow path 62b are divided by partitions 64a and 64b, but Figure 7 The partition structure (i.e., partial partition wall) of the embodiment 2 shown in FIG. Figure 8 The partition structure (ie, the check valve) of the third embodiment shown is applied to the fourth embodiment.

[0079] In addition, the motor of the fourth embodiment has the stator internal coolant flow path 70, but does not have the coolant discharge flow path 68. Fig.11 As shown, the motor may also have both a coolant discharge flow path 68 and a stator internal coolant flow path 70. In this case, by adopting the same partition structure as in Embodiments 1 to 4, the imbalance of the flow rate between the coolant discharge flow paths 68 and the imbalance of the flow rate between the stator internal coolant flow paths 70 can also be suppressed.

[0080] Example 5

[0081] In the fifth embodiment, the configuration of the guide ring 60 is different from that of the first embodiment. The fifth embodiment is the same as the first embodiment except for the guide ring 60 .

[0082] like Fig.12 As shown, in Example 5, the annular coolant flow path 62 inside the guide ring 60 is not provided with a partitioning structure. That is, the annular coolant flow path 62 is connected in a ring shape and has a constant flow path cross-sectional area throughout its entire circumference. A coolant supply flow path 66 is connected to the guide ring 60. A plurality of coolant discharge flow paths 68 are provided in the guide ring 60. As in Example 1, each coolant discharge flow path 68 discharges coolant toward the coil end 42a. Unlike Example 1, in Example 5, the coolant discharge flow path 68 is not provided at the lowest part of the annular coolant flow path 62. Excluding the lowest part, the coolant discharge flow paths 68 are provided at equal angular intervals in the circumferential direction of the guide ring 60. Therefore, the number of coolant discharge flow paths 68 connected to the annular coolant flow path 62 at a position above the center position CH in the up-down direction of the annular coolant flow path 62 (i.e., a horizontal line passing through the center of the circle of the annular coolant flow path 62) is greater than the number of coolant discharge flow paths 68 connected to the annular coolant flow path 62 at a position below the center position CH. In addition, the cross-sectional area of ​​each coolant discharge flow path 68 is equal. Therefore, the total value of the cross-sectional area of ​​the coolant discharge flow paths 68 connected to the annular coolant flow path 62 at a position above the center position CH is greater than the total value of the cross-sectional area of ​​the coolant discharge flow paths 68 connected to the annular coolant flow path 62 at a position below the center position CH. In addition, as Fig.12 When the coolant discharge flow path 68c provided at the center position CH is present, the cross-sectional area is distributed at a ratio above and below the center position CH, and the above-mentioned total value is calculated.

[0083] When the motor of the fifth embodiment is operated, the coolant is supplied to the annular coolant flow path 62 via the coolant supply flow path 66 by a pump (not shown). The coolant in the annular coolant flow path 62 is discharged toward the coil end 42a from each coolant discharge flow path 68. In the fifth embodiment, since the annular coolant flow path 62 is not provided with a partition structure, the pressure in the annular coolant flow path 62 becomes higher at a position lower than the center position CH due to the influence of gravity than at a position higher than the center position CH. On the other hand, as described above, the total value of the cross-sectional area of ​​the coolant discharge flow path 68 at a position higher than the center position CH is greater than the total value of the cross-sectional area of ​​the coolant discharge flow path 68 at a position lower than the center position CH. That is, the comprehensive flow path resistance of the coolant discharge flow path 68 at a position higher than the center position CH is smaller than the comprehensive flow path resistance of the coolant discharge flow path 68 at a position lower than the center position CH. Therefore, even if there is a pressure difference between a position above the center position CH and a position below the center position CH, it is difficult to generate a difference between the flow rate of the coolant discharged to the coil end 42a at the position above the center position CH and the flow rate of the coolant discharged to the coil end 42a at the position below the center position CH. Therefore, according to Embodiment 5, the coil end 42a can be cooled uniformly.

[0084] Example 6

[0085] like Fig.13 As shown, in Example 6, the motor has a stator inner coolant flow path 70 in addition to the coolant discharge flow path 68. The other structures of Example 6 are the same as those of Example 5. Fig. 9 ) Similarly, each stator inner coolant flow path 70 penetrates the stator core 32 in the axial direction. Fig.13 As shown, the upstream end of each stator internal coolant flow path 70 is connected to the annular coolant flow path 62 .

[0086] In Example 6, the stator internal coolant flow path 70 is not provided at the lowest portion of the annular coolant flow path 62. Excluding the lowest portion, the stator internal coolant flow path 70 is provided at equal angular intervals in the circumferential direction of the guide ring 60. Therefore, the number of stator internal coolant flow paths 70 connected to the annular coolant flow path 62 at a position above the center position CH is greater than the number of stator internal coolant flow paths 70 connected to the annular coolant flow path 62 at a position below the center position CH. In addition, the cross-sectional area of ​​each stator internal coolant flow path 70 is equal. Therefore, the total value of the cross-sectional area of ​​the stator internal coolant flow path 70 connected to the annular coolant flow path 62 at a position above the center position CH is greater than the total value of the cross-sectional area of ​​the stator internal coolant flow path 70 connected to the annular coolant flow path 62 at a position below the center position CH. In addition, as Fig.13When there is the stator inner coolant flow path 70c provided at the center position CH, the cross-sectional area is distributed at a ratio above and below the center position CH, and the above-mentioned total value is calculated.

[0087] When the motor of the sixth embodiment is in operation, the coolant flows to the stator inner coolant flow path 70 in addition to the coolant discharge flow path 68. In the sixth embodiment, due to the influence of gravity, the pressure in the annular coolant flow path 62 becomes higher at the position below the center position CH than at the position above the center position CH. As in the fifth embodiment, the imbalance of the coolant flowing to the coolant discharge flow path 68 can be suppressed between the position above the center position CH and the position below the center position CH, and the coil end 42a can be uniformly cooled. In addition, in the sixth embodiment, the total value of the cross-sectional area of ​​the stator inner coolant flow path 70 at the position above the center position CH is larger than the total value of the cross-sectional area of ​​the stator inner coolant flow path 70 at the position below the center position CH. That is, the comprehensive flow resistance of the stator inner coolant flow path 70 at the position above the center position CH is smaller than the comprehensive flow resistance of the stator inner coolant flow path 70 at the position below the center position CH. Therefore, even if there is a pressure difference between a position above the center position CH and a position below the center position CH, it is difficult for a difference to occur between the flow rate of the coolant flowing to the stator inner coolant flow path 70 above the center position CH and the flow rate of the coolant flowing to the stator inner coolant flow path 70 below the center position CH. Therefore, according to the sixth embodiment, the stator core 32 can be cooled uniformly.

[0088] Example 7

[0089] In the seventh embodiment, the arrangement and cross-sectional area of ​​the coolant discharge flow path 68 are different from those in the fifth embodiment. The other structures of the seventh embodiment are the same as those of the fifth embodiment.

[0090] like Fig.14As shown, in Example 7, the coolant discharge flow path 68 is arranged at equal angular intervals in the entire circumferential direction of the annular coolant flow path 62. Therefore, the number of coolant discharge flow paths 68 connected to the annular coolant flow path 62 at a position above the center position CH is equal to the number of coolant discharge flow paths 68 connected to the annular coolant flow path 62 at a position below the center position CH. In Example 7, the cross-sectional area of ​​each coolant discharge flow path 68a located at a position above the center position CH is larger than the cross-sectional area of ​​each coolant discharge flow path 68b located at a position below the center position CH. Therefore, the total value of the cross-sectional area of ​​the coolant discharge flow path 68 connected to the annular coolant flow path 62 at a position above the center position CH is larger than the total value of the cross-sectional area of ​​the coolant discharge flow path 68 connected to the annular coolant flow path 62 at a position below the center position CH. The flow path resistance of each coolant discharge flow path 68a is smaller than the flow path resistance of each coolant discharge flow path 68b.

[0091] When the motor of the seventh embodiment is in operation, the coolant in the annular coolant flow path 62 is discharged from each coolant discharge flow path 68 toward the coil end 42a. In the seventh embodiment, since the annular coolant flow path 62 is not provided with a partition structure, the pressure in the annular coolant flow path 62 becomes higher at a position below the center position CH than at a position above the center position CH due to the influence of gravity. However, since the flow resistance of the coolant discharge flow path 68a located at a position above the center position CH is smaller than the flow resistance of the coolant discharge flow path 68b located at a position below the center position CH, even if there is a pressure difference between a position above the center position CH and a position below the center position CH, the flow rate of the coolant discharged to the coil end 42a at a position above the center position CH and the flow rate of the coolant discharged to the coil end 42a at a position below the center position CH are unlikely to differ. Therefore, according to the seventh embodiment, the coil end 42a can be uniformly cooled.

[0092] Example 8

[0093] like Fig.15 As shown, in the eighth embodiment, the motor has a stator inner coolant flow path 70 in addition to the coolant discharge flow path 68. The other structures of the eighth embodiment are the same as those of the seventh embodiment. Fig. 9 ) Similarly, each stator inner coolant flow path 70 penetrates the stator core 32 in the axial direction. Fig.15 As shown, the upstream end of each stator internal coolant flow path 70 is connected to the annular coolant flow path 62 .

[0094] In the eighth embodiment, the stator inner coolant flow path 70 is arranged at uniform angular intervals throughout the circumferential direction of the annular coolant flow path 62. Therefore, the number of stator inner coolant flow paths 70 connected to the annular coolant flow path 62 at a position above the center position CH is equal to the number of stator inner coolant flow paths 70 connected to the annular coolant flow path 62 at a position below the center position CH. In addition, in the eighth embodiment, the cross-sectional area of ​​each stator inner coolant flow path 70a located at a position above the center position CH is larger than the cross-sectional area of ​​each stator inner coolant flow path 70b located at a position below the center position CH. Therefore, the total value of the cross-sectional area of ​​the stator inner coolant flow path 70 connected to the annular coolant flow path 62 at a position above the center position CH is larger than the total value of the cross-sectional area of ​​the stator inner coolant flow path 70 connected to the annular coolant flow path 62 at a position below the center position CH. The flow path resistance of each stator internal coolant flow path 70 a is smaller than the flow path resistance of each stator internal coolant flow path 70 b .

[0095] When the motor of the eighth embodiment is in operation, the coolant flows to the stator inner coolant flow path 70 in addition to the coolant discharge flow path 68. In the eighth embodiment, due to the influence of gravity, the pressure in the annular coolant flow path 62 becomes higher at a position below the center position CH than at a position above the center position CH. As in the seventh embodiment, the imbalance of the coolant flowing to the coolant discharge flow path 68 can be suppressed between the position above the center position CH and the position below the center position CH, and the coil end 42a can be evenly cooled. In the eighth embodiment, since the flow resistance of the stator inner coolant flow path 70a located above the center position CH is smaller than the flow resistance of the stator inner coolant flow path 70b located below the center position CH, even if there is a pressure difference between the position above the center position CH and the position below the center position CH, it is difficult for the flow rate of the coolant flowing to the stator inner coolant flow path 70 located above the center position CH to differ from the flow rate of the coolant flowing to the stator inner coolant flow path 70 located below the center position CH. Therefore, according to the eighth embodiment, the stator core 32 can be cooled uniformly.

[0096] In addition, in the eighth embodiment, the cross-sectional area of ​​the entire stator internal coolant flow path 70 in the flow direction is different. However, it is also possible to adjust the flow resistance of the stator internal coolant flow path 70 by providing a throttling portion in a part of the stator internal coolant flow path 70. For example, it is also possible to Fig.16As shown, by providing a throttle portion 70x with a smaller cross-sectional area at the downstream end of the stator internal coolant flow path 70b below the center position, the flow path resistance of the lower stator internal coolant flow path 70b is made greater than the flow path resistance of the upper stator internal coolant flow path 70a.

[0097] In addition, in the above-mentioned embodiments, an annular coolant flow path 62 is provided inside the guide ring 60. However, it may also be Fig.17 As shown, the guide ring 60 does not have a flow path inside, and an annular coolant flow path 62 is formed by the outer peripheral surface of the guide ring 60 , the inner surface of the housing 50 , and the end surface 32 a of the stator core 32 .

[0098] The above detailed description of the implementation methods is provided, but these are merely examples and do not limit the claims. The technology described in the claims includes various modifications and changes to the specific examples illustrated above. The technical elements described in this specification or the drawings can exert technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of application. In addition, the technology illustrated in this specification or the drawings can achieve multiple purposes at the same time, and achieving one of the purposes itself has technical usefulness.

Claims

1. A motor, wherein: The motor has: A stator, wherein the stator is configured such that a central axis intersects a vertical direction; an annular coolant flow path, the annular coolant flow path is arranged along the end surface of the stator and has an annular shape extending around the central axis; as well as a plurality of separate flow paths, each of which is connected to the annular coolant flow path and through which the coolant supplied from the annular coolant flow path flows; The annular coolant flow path has a partition structure, and the partition structure divides the annular coolant flow path into an upper flow path and a lower flow path located below the upper flow path. The plurality of individual flow passages include a plurality of upper individual flow passages connected to the upper flow passage and a plurality of lower individual flow passages connected to the lower flow passage.

2. The motor according to claim 1, wherein: The partition structure is a partition wall that separates the upper flow path from the lower flow path. The motor further includes an upper coolant supply flow path for supplying coolant to the upper flow path, and a lower coolant supply flow path for supplying coolant to the lower flow path.

3. The motor according to claim 1, wherein: The partition structure is a partial partition wall that reduces the cross section of the annular coolant flow path. The motor further includes a coolant supply flow path for supplying coolant to the upper flow path.

4. The motor according to claim 1, wherein: The partition structure is a check valve that allows the coolant to flow from the upper flow path to the lower flow path and prevents the coolant from flowing from the lower flow path to the upper flow path. The motor further includes a coolant supply flow path for supplying coolant to the upper flow path.

5. The motor according to any one of claims 1 to 4, wherein: The motor further includes a coil, which is wound around the stator and has a coil end arranged at an inner peripheral portion of the annular coolant flow path. The plurality of individual flow paths include a plurality of coolant discharge flow paths for discharging the coolant toward the coil ends.

6. The motor according to any one of claims 1 to 4, wherein: The plurality of individual flow paths include a plurality of stator internal coolant flow paths provided inside the stator.

7. A motor, wherein: The motor has: A stator, wherein the stator is configured such that a central axis intersects a vertical direction; an annular coolant flow path, the annular coolant flow path is arranged along the end surface of the stator and has an annular shape extending around the central axis; a coil wound around the stator and having a coil end disposed on an inner circumference of the annular coolant flow path; as well as A plurality of coolant discharge flow paths, each of which is connected to the annular coolant flow path and discharges the coolant supplied from the annular coolant flow path toward the coil end. The total value of the cross-sectional areas of the coolant discharge flow path connected to the annular coolant flow path at a position above the center position of the annular coolant flow path in the up-down direction is greater than the total value of the cross-sectional areas of the coolant discharge flow path connected to the annular coolant flow path at a position below the center position.

8. The motor according to claim 7, wherein: The motor further comprises a plurality of stator inner coolant flow paths, wherein the plurality of stator inner coolant flow paths are respectively arranged inside the stator and are respectively connected to the annular coolant flow path, through which the coolant supplied from the annular coolant flow path flows. The total cross-sectional area of ​​the stator inner coolant flow path connected to the annular coolant flow path above the center position is larger than the total cross-sectional area of ​​the stator inner coolant flow path connected to the annular coolant flow path below the center position.

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