A motor

Abstract

The present disclosure provides a motor having a stator core, a housing that houses the stator core, a guide ring housed in the housing, having a ring shape extending around a motor shaft, and being in contact with an end surface of the stator core, a circular ring-shaped cooling liquid flow path provided between an inner peripheral surface of the housing and an outer peripheral surface of the guide ring, and a coil wound around the stator core, having a coil end disposed on an inner peripheral side of the guide ring. The guide ring has a discharge port that discharges a cooling liquid in the circular ring-shaped cooling liquid flow path toward the coil end, the discharge port discharging the cooling liquid in a direction inclined to a circumferential direction of the coil end with respect to a radial direction of the coil end. The structure of the present disclosure can improve the cooling efficiency of the coil end.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a motor. Background Technology

[0002] Japanese Patent Application Publication No. 2013-039012 discloses a motor that discharges coolant from the top towards the coil ends of the stator, thereby cooling the coil ends. However, when coolant is discharged towards the coil ends, the flow rate of the coolant decreases on the surface of the coil ends, making it impossible to effectively cool the coil ends. Utility Model Content

[0003] This disclosure presents a technique for effectively cooling the coil ends.

[0004] This disclosure relates to a motor comprising: a stator core; a housing housing the stator core; a guide ring housed within the housing, having an annular shape extending around a motor shaft and contacting an end face of the stator core; an annular coolant flow path disposed between an inner circumferential surface of the housing and an outer circumferential surface of the guide ring; and a coil wound around the stator core, having a coil end disposed on the inner circumferential side of the guide ring. The guide ring has a discharge port for discharging coolant from the annular coolant flow path toward the coil end, the discharge port discharging coolant in a direction inclined radially toward the circumferential direction of the coil end relative to the radial direction of the coil end.

[0005] In this motor, the outlet located on the guide ring discharges coolant in a direction inclined radially toward the circumferential direction relative to the coil end. Therefore, the coolant easily flows circumferentially on the surface of the coil end, preventing a decrease in coolant flow velocity on the coil end surface. Thus, the coil end can be effectively cooled. Attached Figure Description

[0006] Figure 1 This is an exploded perspective view of the motor in the embodiment.

[0007] Figure 2 This is a partial cross-sectional view of the motor in the embodiment.

[0008] Figure 3A This is a top view schematic diagram of one embodiment of the stator viewed along the axial direction.

[0009] Figure 3B This is a top view schematic diagram of another illustrative embodiment of the stator viewed along the axial direction. Detailed Implementation

[0010] Figure 1 and 2The motor 10 of the illustrated embodiment includes a rotor 20, a stator 30, a housing 50, a guide ring 60, and an annular coolant flow path 56. The rotor 20 has a shaft 24. The stator 30 has a cylindrical shape. The rotor 20 is arranged in the central hole of the stator 30 such that the central axis of the shaft 24 coincides with the central axis of the stator 30. The rotor 20 and the stator 30 are housed within the housing 50. Hereinafter, the direction parallel to the rotation axis of the motor 10 (i.e., the central axis of the shaft 24) will be referred to as the axial direction, and the direction along the radius of the circle centered on the rotation axis of the motor 10 will be referred to as the radial direction.

[0011] The housing 50 has a so-called bottomed cylindrical shape and has an outer peripheral wall 52 and a partition wall 54. The outer peripheral wall 52 has a cylindrical shape. The partition wall 54 is disposed at one end of the outer peripheral wall 52 in the axial direction. A through hole 54a is provided at the center of the partition wall 54 (see...). Figure 2 ).

[0012] The stator 30 has a stator core 32 and a coil 40. The stator core 32 has a cylindrical shape. Although not shown, multiple teeth protruding toward the central axis of the stator core 32 are provided on the inner circumferential surface of the stator core 32. The coil 40 is wound around each tooth. The stator core 32 has an end face 32a and an end face 32b. End face 32a is an axial end face of the stator core 32, and end face 32b is the opposite end face of end face 32a. A coil end 42a is provided on end face 32a. A coil end 42b is provided on end face 32b. Coil ends 42a and 42b are bent portions of the coil 40 wound around the stator core 32. Coil end 42a protrudes from end face 32a, and coil end 42b protrudes from end face 32b.

[0013] like Figure 3A As shown, the coil ends 42a are arranged in a ring on the end face 32a. Similarly, the coil ends 42b are arranged in a ring on the end face 32b. Figure 1 , 2 As shown, the stator core 32 is housed within the housing 50. The stator core 32 is fastened to the housing 50 by bolts 49.

[0014] like Figure 1 and 2 As shown, the outer peripheral wall 52 of the housing 50 has a cylindrical shape extending along the outer peripheral surface of the stator core 32. The outer peripheral wall 52 is opposite to the outer peripheral surface of the stator core 32. The partition wall 54 of the housing 50 is opposite to the end face 32a of the stator core 32. Figure 2 As shown, a gap is provided between the partition wall 54 and the end face 32a of the stator core 32, and the coil end 42a is arranged in the gap.

[0015] The rotor 20 is disposed concentrically with the stator core 32 in the center hole of the stator core 32. The shaft 24 of the rotor 20 is inserted into the through hole 54a of the housing 50. The rotor 20 is rotatably supported within the housing 50 by bearings (not shown) or the like.

[0016] like Figure 1 and 2 As shown, the motor 10 has a guide ring 60. The guide ring 60 has a ring shape. The outer diameter of the guide ring 60 (i.e., the diameter of the largest diameter portion) is smaller than the diameter of the stator core 32. The inner diameter of the guide ring 60 (i.e., the diameter of the smallest diameter portion) is larger than the outer diameter of the coil end 42a. The guide ring 60 is housed within the housing 50. The guide ring 60 is configured to extend in a ring around the shaft (i.e., shaft 24) of the motor 10. The guide ring 60 is arranged concentrically with the rotor 20 and the stator core 32 between the end face 32a of the stator core 32 and the partition wall 54 of the housing 50. The guide ring 60 is clamped and fixed between the end face 32a and the partition wall 54. The coil end 42a is arranged radially inward of the guide ring 60. The guide ring 60 divides the space between the stator core 32 and the partition wall 54 into an outer peripheral space 56 and an inner peripheral space 57. The space 56 on the outer periphery is a circular space enclosed by the inner peripheral surface of the outer peripheral wall 52, the outer peripheral surface of the guide ring 60, the partition wall 54, and the end face 32a of the stator core 32. Hereinafter, this space 56 on the outer periphery will be referred to as the annular coolant flow path 56.

[0017] like Figure 2 As shown, a coolant supply passage 53a is provided on the housing 50. The coolant supply passage 53a connects the outside of the housing 50 to the annular coolant flow path 56. A coolant discharge passage 53b is provided at the lower part of the housing 50. The coolant discharge passage 53b connects the inside of the housing 50 to the outside. The coolant discharge passage 53b is connected to the coolant supply passage 53a via a circulation path (not shown) located outside the housing 50. A pump (not shown) is provided in the circulation path. When the pump operates, coolant is supplied from the coolant supply passage 53a to the annular coolant flow path 56. The coolant supplied to the annular coolant flow path 56 flows inside the housing 50 and is discharged from the coolant discharge passage 53b to the circulation path outside the housing 50. In this way, the coolant circulates in the circulation path and the housing 50. In this embodiment, the coolant is cooling oil. The cooling oil functions as a coolant to cool the motor 10 and as a lubricant to lubricate the rotor 20.

[0018] like Figure 2As shown, multiple internal coolant flow paths 39 are formed within the stator core 32. The upstream end of each internal coolant flow path 39 is connected to an annular coolant flow path 56. The downstream end of each internal coolant flow path 39 is open at end face 32b. Multiple internal coolant flow paths 39 are distributed circumferentially within the stator core 32.

[0019] like Figure 3A As shown, a plurality of protrusions are provided on the inner circumferential surface of the guide ring 60. The portion where each protrusion is provided becomes a thick-walled portion 62 with a thickness greater than other portions of the guide ring 60. A plurality of thick-walled portions 62 are provided circumferentially on the guide ring 60. Discharge ports 64a and 64b are provided on each thick-walled portion 62. Each discharge port 64a and 64b penetrates the guide ring 60. The annular coolant flow path 56 and the space 57 (i.e., the space where the coil end 42a exists) are connected through the discharge ports 64a and 64b. Each discharge port 64a and 64b discharges coolant from the annular coolant flow path 56 toward the coil end 42a. Each discharge port 64b, except for the uppermost discharge port 64a, extends radially and circumferentially inclined relative to the coil end 42a. Each discharge port 64b discharges coolant obliquely downward in the circumferential direction relative to the coil end 42a. More specifically, each outlet 64b discharges coolant along the tangential direction of the coil end 42a.

[0020] When the motor 10 is actuated, coolant is supplied to the interior of the housing 50. The coolant is supplied from the coolant supply passage 53a to the annular coolant flow path 56. The coolant in the annular coolant flow path 56 flows into the core coolant flow path 39 and the outlets 64a and 64b. The stator core 32 is cooled by the coolant flowing in the core coolant flow path 39. The coolant flowing to the downstream end in the core coolant flow path 39 is discharged from the end face 32b. The coil end 42b is cooled by the coolant discharged from the end face 32b. Additionally, the coolant flowing into the outlet 64 is discharged towards the coil end 42a. Thus, the coil end 42a is cooled. The coolant discharged from the core coolant flow path 39 and the outlet 64 flows to the lower part of the housing 50. The coolant flowing to the lower part of the housing 50 is pumped from the coolant discharge passage 53b to the coolant supply passage 53a via an external pump. In this way, the motor 10 is cooled by the circulation of coolant.

[0021] As described above, each outlet 64b discharges coolant obliquely downwards in the circumferential direction relative to the coil end 42a. That is, each outlet 64b discharges coolant along the tangential direction of the coil end 42a. Therefore, at each location where the coolant discharged from the outlet 64b contacts the coil end 42a, the flow rate of the coolant is less likely to decrease. Consequently, the coolant discharged from the outlet 64b flows circumferentially at the coil end 42a at a relatively fast speed, and the coolant is less likely to stagnate on the surface of the coil end 42a. Therefore, the coil end 42a is cooled efficiently. As explained above, the outlet 64b is inclined radially, thereby improving the cooling efficiency of the coil end 42a.

[0022] In addition, Figure 3A In this case, a thick-walled portion 62 is formed by providing a protrusion on the inner circumferential surface of the guide ring 60, but it can also be formed as follows: Figure 3B In this way, a thick-walled portion 62 is formed by providing a protrusion on the outer peripheral surface of the guide ring 60. In this structure, a discharge port 64b that is inclined radially can also be provided on each thick-walled portion 62.

[0023] Although the embodiments have been described in detail above, they are merely illustrative and do not limit the scope of the claims. The technology described in the claims includes technologies obtained by various modifications and alterations to the specific examples illustrated above. The technical elements described in this specification or drawings exert their technical usefulness individually or in various combinations, and are not limited to the combinations recited in the claims at the time of application. In addition, the technology illustrated in this specification or drawings achieves multiple objectives simultaneously, and achieving one of these objectives is itself technically useful.

[0024] Explanation of reference numerals in the attached figures 10 motors 20 rotors 24-axis 30 stators 32 stator core 32a and 32b end faces 39 Iron Core Internal Coolant Flow Path 40 coils 42a and 42b coil terminals 49 bolts 50 Housing 52. Outer wall 53a Coolant Supply Passage 53b Coolant drain passage 54 Next door 54a Through Hole 56. Circular coolant flow path 57 Space 60 Guide ring 62 Thick-walled section 64a and 64b are discharge outlets.

Claims

1. A motor, characterized in that, have: Stator core; The housing contains the stator core; A guide ring, housed within the housing, has a ring shape extending around the motor shaft and contacts the end face of the stator core; A circular coolant flow path is provided between the inner circumferential surface of the housing and the outer circumferential surface of the guide ring; as well as A coil, wound around the stator core, has coil ends disposed on the inner circumferential side of the guide ring. The guide ring has an outlet for discharging coolant from the annular coolant flow path toward the coil end, the outlet discharging coolant in a direction inclined radially toward the circumferential direction of the coil end relative to the radial direction of the coil end.

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