motor

Abstract

Ensure the motor coil ends are properly cooled. [Solution] The motor comprises a stator having a stator core and coils. The motor comprises a housing that accommodates the stator. The motor comprises an insulating first annular member that seals the space between a first end face of the stator core in the axial direction and the inner wall surface of the housing. The coil has a first coil end protruding from the first end face. The inner wall surface has a first inner wall surface radially opposite to the first coil end and a second inner wall surface axially opposite to the first coil end. The first annular member comprises a first portion interposed between the first coil end and the first inner wall surface. The first annular member comprises a second portion protruding radially inward from the first portion and interposed between the first coil end and the second inner wall surface. The first portion comprises a plurality of first holes for injecting refrigerant toward the first coil end.

Description

Technical Field

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

[0002] In the motor shown in Patent Document 1, a stator is housed inside a housing. A plurality of injection holes are arranged in an annular member that seals the axial end face of the stator core and the inner surface of the housing. Refrigerant can be injected from each of the plurality of injection holes toward the coil end.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By miniaturizing the motor, the coil end may be close to the inner surface of the housing. In this case, it may be difficult to ensure the insulation performance between the coil end and the housing.

Means for Solving the Problems

[0005] The motor comprises a stator having a stator core and coils. The motor comprises a housing that accommodates the stator. The motor comprises an insulating first annular member that seals the space between a first end face of the stator core in the axial direction and the inner wall surface of the housing. The coil has a first coil end protruding from the first end face. The inner wall surface has a first inner wall surface radially opposite to the first coil end and a second inner wall surface axially opposite to the first coil end. The first annular member has a cylindrical shape around its axis and comprises a first portion interposed between the first coil end and the first inner wall surface. The first annular member protrudes radially inward from the first portion and comprises a second portion interposed between the first coil end and the second inner wall surface. The first portion comprises a plurality of first holes for injecting refrigerant toward the first coil end.

[0006] The refrigerant can be of various types, such as cooling oil. The refrigerant may also be a liquid such as water, or a fluid containing gases, etc. According to the above configuration, the second portion of the insulating first annular member enhances the insulation performance between the first coil end and the second inner wall surface of the housing. The first annular member enables both the function of cooling the first coil end and the function of insulating the first coil end. This allows for miniaturization of the motor. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic cross-sectional view of motor 1. [Figure 2] This is a side view of the stator 20, etc. [Figure 3A] This is a schematic enlarged view of region RA in Figure 1. [Figure 3B] This is a schematic cross-sectional view along line BB in Figure 1. [Figure 3C] This is a schematic cross-sectional view along the CC line in Figure 1. [Figure 4] This is a partially enlarged cross-sectional view along line IV-IV in Figure 2. [Figure 5] This is a schematic cross-sectional view of the VV line passing through the central plane CP in Figure 1. [Figure 6] This is a schematic cross-sectional view of motor 201. [Figure 7] This is a schematic cross-sectional view of motor 301. [Modes for carrying out the invention]

[0008] Multiple first holes may be located between the first end face and the portion where the second portion is connected to the first portion. According to the above configuration, the refrigerant injected from the first holes can be guided to the first coil end by the second portion. Since the amount of refrigerant reaching the first coil end can be increased, the cooling efficiency can be improved.

[0009] The first annular member may be made of an insulating resin. With the above configuration, the insulating performance between the first coil end and the second inner wall surface of the housing can be reliably improved.

[0010] The coil may comprise multiple segment coils, each having an insulating coating on its outer surface. At the first coil end, each end of the multiple segment coils may be exposed from the insulating coating. The exposed ends of the segment coils are more prone to short circuits with the second inner wall surface of the housing than the parts covered by the insulating coating. With the above configuration, the second portion of the first annular member can improve the insulation performance between the exposed ends of the segment coils and the second inner wall surface of the housing.

[0011] The second part may have a ring shape centered on the axis. This configuration allows for improved insulation performance throughout the entire circumferential direction centered on the axis.

[0012] The stator core may have an inner circumferential surface that forms a cylindrical opening centered on an axis. The radial inner end of the ring-shaped second portion may be located radially outward from the inner circumferential surface of the stator core. This configuration makes it possible to suppress the second portion from hindering the operation of the rotating part of the motor.

[0013] The thickness of the radial inner end of the ring-shaped second part may be less than the thickness of the radial outer end of the second part. This configuration allows for a shape in which the tip of the second part is thinner than the base. Since the weight of the tip can be reduced, the bending moment acting on the base of the second part can be suppressed. This makes it possible to suppress breakage and vibration of the second part.

[0014] At least a portion of the second part may be in contact with the second inner wall surface. This configuration allows for minimizing the distance between the second part and the second inner wall surface, enabling further miniaturization of the motor.

[0015] The motor may further include a plurality of power lines projecting axially from the first coil end. The second part may include at least one through-hole or notch through which the plurality of power lines pass. This configuration allows for proper placement of the second part even when a plurality of power lines are present.

[0016] The system may further include an insulating second annular member that seals the space between the second end face of the stator core, located axially opposite to the first end face, and the inner wall surface of the housing. The coil may have a second coil end protruding from the second end face of the stator core. The first inner wall surface of the housing may face the second coil end radially. The inner wall surface of the housing may further have a third inner wall surface facing the second coil end axially. The second annular member may have a cylindrical shape around an axis and include a third portion interposed between the second coil end and the first inner wall surface, and a fourth portion protruding radially inward from the third portion and interposed between the second coil end and the third inner wall surface. The third portion may include a plurality of second holes for injecting coolant toward the second coil end. With this configuration, the second annular member can perform multiple functions, including cooling the second coil end and insulating the second coil end. This allows for miniaturization of the motor size.

[0017] An insulating second annular member that seals between the first end face of the stator core and the second end face located on the opposite side in the axial direction and the inner wall surface of the housing may be further provided. The coil may have a second coil end protruding from the second end face of the stator core. The first inner wall surface of the housing may face the second coil end in the radial direction. The inner wall surface of the housing may further have a third inner wall surface facing the second coil end in the axial direction. The second annular member has a cylindrical shape centered on the axis and may be interposed between the second coil end and the first inner wall surface. The second annular member may be provided with a plurality of second holes for injecting a refrigerant toward the second coil end. The second annular member may not be interposed between the second coil end and the third inner wall surface. According to the above configuration, it becomes possible to more importantly insulate the first coil end compared to the second coil end.

Embodiment

[0018] (Structure of Motor 1) FIG. 1 shows a schematic cross-sectional view of a motor 1 according to this embodiment. FIG. 2 shows side views of a stator 20, a first annular member 41, and a second annular member 42. In FIG. 2, for clarity, the descriptions of the housing 30, the rotor 10, and the rotating shaft 11 are omitted. Also, the inner wall surface 30w and the supply port 30p of the housing 30 are shown by imaginary lines. In FIGS. 1 and 2, the z-axis direction is the vertical direction, and the x-axis direction and the y-axis direction are the horizontal directions. Also, the x-axis direction is the direction in which the rotating shaft 11 extends. The coordinate relationship is the same in the subsequent figures.

[0019] The motor 1 is mounted on an electric vehicle. The electric vehicle includes a hybrid vehicle and an electric vehicle. In the electric vehicle, the motor 1 may be used as a driving motor that generates power for driving the vehicle, or may be used as a generator that generates electricity by regenerative braking force or surplus power of the engine. In the electric vehicle, the motor 1 is mounted such that the negative direction of the z-axis coincides with the gravitational direction.

[0020] As shown in Figure 1, the motor 1 has a central plane CP perpendicular to the rotation axis 11. The central plane CP is a plane that passes through the axial center of the stator core 21. The motor 1 has a structure that is symmetrical with respect to the central plane CP. Therefore, in this specification, the structure on the +x direction side with respect to the central plane CP will be described mainly.

[0021] Motor 1 mainly comprises a rotor 10, a stator 20, a housing 30, a first annular member 41, and a second annular member 42. The rotor 10 has a rotating shaft 11. The rotating shaft 11 is supported by the housing 30 via bearings (not shown) and is capable of rotation. The rotor 10 is fixed to the rotating shaft 11.

[0022] The stator 20 has a stator core 21 and a coil 22. The stator core 21 is a substantially annular member made of laminated steel plate or the like. A first end face 21e1 is formed at one end of the stator core 21 in the axial direction (x direction), and a second end face 21e2 is formed at the other end. Windings constituting the coil 22 are wound around the stator core 21. The first coil end 22e1 of the coil 22 protrudes axially from the first end face 21e1. The second coil end 22e2 of the coil 22 protrudes axially from the second end face 21e2.

[0023] The stator core 21 also has a central axis CA. The central axis CA of the stator core 21 is the same as the central axis of the rotation axis 11. The stator core 21 has an inner circumferential surface 21i. The inner circumferential surface 21i of the stator core forms a cylindrical opening centered on the central axis CA. The rotor 10 is positioned inside this opening.

[0024] Figure 3A shows a schematic enlarged view of region RA in Figure 1. The coil 22 comprises multiple segment coils 22s. Note that Figure 3A only shows a portion of the multiple segment coils 22s. Also, in Figure 3A, multiple segment coils 22s are shown in a side view, while the others are shown in a cross-sectional view. The segment coils 22s are coated with an insulating film 26 on their outer surface. The end EDs of the multiple segment coils 22s are arranged at the first coil end 22e1. The end EDs are exposed from the insulating film 26. As shown in Figure 3A, the ends EDs of a corresponding pair of segment coils 22s are in contact with each other and their tips are welded together. This forms a welded portion 22m at the tip of the end ED.

[0025] Furthermore, each end ED of the multiple segment coils may be covered with an insulator 27. In Figure 3A, the insulator is shown with dashed lines. The insulator 27 may be of various types, such as dipped resin or powder coating. This can further improve the insulation performance of the end ED.

[0026] On the other hand, the second coil end 22e2 does not have the end of the segment coil positioned there. Also, the segment coil at the second coil end 22e2 is covered with an insulating coating. Therefore, no welded joint is formed at the second coil end 22e2. In other words, the first coil end 22e1 and the second coil end 22e2 have different shapes.

[0027] In Figure 1, the housing 30 is a component that houses the rotor 10 and the stator 20. The housing 30 surrounds the stator 20. A supply port 30p, which will be described later, is formed on the side of the housing 30. A cooling oil reservoir (not shown) is also located at the bottom of the housing 30. The inner wall surface of the housing 30 comprises a first inner wall surface 30w1, a second inner wall surface 30w2, and a third inner wall surface 30w3. The first inner wall surface 30w1 is the surface that faces the first coil end 22e1 in the radial direction. In other words, the first inner wall surface 30w1 surrounds the outer circumference of the first coil end 22e1. The second inner wall surface 30w2 is the surface that faces the first coil end 22e1 in the axial direction. In other words, the second inner wall surface 30w2 is located in the +x direction of the first coil end 22e1. The third inner wall surface 30w3 is the surface that faces the second coil end 22e2 in the axial direction. In other words, the third inner wall surface 30w3 is located in the -x direction of the second coil end 22e2. The basic configuration of the housing 30 can utilize known prior art, so a detailed explanation is omitted here.

[0028] The first annular member 41 is made of an insulating resin. The first annular member 41 comprises a first portion 41_1 and a second portion 41_2. The first portion 41_1 of the first annular member 41 will be described with reference to Figure 3A. The first portion 41_1 has a cylindrical shape centered on the central axis CA. The first portion 41_1 is interposed between the first coil end 22e1 and the first inner wall surface 30w1. The first end portion 41e1 of the first portion 41_1 is connected to the first end face 21e1 of the stator core 21. The second end portion 41e2 of the first portion 41_1 is connected to the first inner wall surface 30w1 of the housing 30. In this way, the first portion 41_1 seals the space between the first end face 21e1 and the first inner wall surface 30w1. Furthermore, various structures (e.g., sealing grooves) to improve airtightness may be formed at the connection between the first end portion 41e1 and the first end face 21e1, and at the connection between the second end portion 41e2 and the first inner wall surface 30w1.

[0029] A space SP1 is formed between the first part 41_1 and the first inner wall surface 30w1. Space SP1 is a ring-shaped space centered on the rotation axis 11. The first part 41_1 surrounds the first coil end 22e1. In other words, the first part 41_1 faces the first coil end 22e1 in the radial direction.

[0030] The first part 41_1 is provided with a plurality of first holes H1. The plurality of first holes H1 are holes for injecting cooling oil toward the first coil end 22e1. The plurality of first holes H1 are located between the first end face 21e1 and the connecting portion 41c. The connecting portion 41c is the portion to which the second part 41_2 connects to the first part 41_1.

[0031] The multiple first holes H1 will be described using Figure 3B. Figure 3B is a schematic cross-sectional view along the line BB in Figure 1. Figure 3B is a cross-sectional view passing through the centers of the multiple first holes H1. The multiple first holes H1 penetrate the first annular member 41 in the thickness direction. As shown in Figure 3B, the multiple first holes H1 are arranged at equal intervals on the circumference. In this embodiment, eight first holes H1 are formed. The shape of the openings of the multiple first holes H1 is circular. All of the multiple first holes H1 have the same first opening area.

[0032] The second portion 41_2 of the first annular member 41 will be described using Figures 3B and 3C. Figure 3C is a schematic cross-sectional view along line CC in Figure 1. Figure 3C is a cross-sectional view passing through a part of the first portion 41_1 and the second portion 41_2. In Figure 3C, the inner circumferential surface 21i of the stator core is shown by dashed lines. The second portion 41_2 protrudes radially inward from the connection portion 41c of the first portion 41_1. The second portion 41_2 is interposed between the first coil end 22e1 and the second inner wall surface 30w2. The second portion 41_2 may be provided along the entire circumferential direction, as shown in Figure 3C. In this case, the second portion 41_2 has a ring shape centered on the central axis CA. The second portion 41_2 may also be provided partially along the circumferential direction. For example, due to various design considerations, such as the arrangement of gears and inverters, there may be areas in the circumferential direction where the distance between the first coil end 22e1 and the second inner wall surface 30w2 is small. In this case, the second portion 41_2 can be provided only in that area. This makes it possible to selectively improve the insulation performance in the desired area.

[0033] The inner end 41_2i is located at the radially inner end of the second part 41_2. The inner end 41_2i is located radially outward by a distance D1 from the inner circumferential surface 21i of the stator core. This prevents the rotational movement of the rotor 10 or the rotating shaft 11 from being obstructed by the second part 41_2.

[0034] The outer end 41_2o is located at the radial outer end of the second part 41_2. The outer end 41_2o has a thickness T1. The inner end 41_2i has a thickness T2. Thickness T2 is smaller than thickness T1. This makes it possible to achieve a shape in which the tip of the second part 41_2 is thinner than the base. Since the weight of the tip side can be reduced, the bending moment acting on the connecting part 41c can be suppressed. This makes it possible to suppress breakage and vibration of the second part 41_2.

[0035] As shown in Figures 1 and 3C, power lines 361-363 are arranged at the first coil end 22e1. Power lines 361-363 are lead wires connected to one end of the U, V, and W phase coils. Power lines 361-363 protrude axially (+x direction) from the first coil end 22e1. In this embodiment, power lines 361-363 are copper busbars. The second part 41_2 is provided with through holes TH1-TH3 through which each of the power lines 361-363 passes. This makes it possible to prevent interference between the power lines 361-363 and the second part 41_2.

[0036] The stator core 21 will be described using Figures 1, 2, 4, and 5. Figure 4 is a partially enlarged cross-sectional view taken along the line IV-IV in Figure 2. Figure 5 is a schematic cross-sectional view taken along the line VV passing through the central plane CP in Figure 1. The stator core 21 is a cylindrical member. As shown in Figure 2, the stator core 21 includes an annular channel 50r, a first channel 50c1, and a second channel 50c2.

[0037] As shown in Figure 5, the annular channel 50r is a groove formed in the circumferential direction around the stator core 21. The upper surface of the annular channel 50r is open. A flow path is formed by covering this open upper surface with the inner wall surface 30w. The annular channel 50r communicates with the supply port 30p of the housing 30.

[0038] As shown in Figures 2 and 4, the multiple first channels 50c1 are tunnel-shaped flow channels formed on the outer circumferential surface of the stator core 21. In Figure 2, the multiple first channels 50c1 and second channels 50c2 are shown by dotted lines. The multiple first channels 50c1 extend from the annular channel 50r to the first end face 21e1 in the +x direction. The multiple first channels 50c1 extend parallel to each other and are arranged at equal intervals in the circumferential direction. Similarly, the multiple second channels 50c2 have the same shape as the multiple first channels 50c1. The multiple second channels 50c2 extend from the annular channel 50r to the second end face 21e2 in the -x direction.

[0039] The above mainly describes the structure on the +x direction side with respect to the central plane CP. The structure on the -x direction side with respect to the central plane CP is the same as the structure on the +x direction side with respect to the central plane CP. That is, a second annular member 42 is provided that seals the space between the second end face 21e2 of the stator core 21 and the first inner wall surface 30w1 of the housing 30. A space SP2 is formed between the second annular member 42 and the first inner wall surface 30w1. The second annular member 42 comprises a third portion 42_3 and a fourth portion 42_4. The third portion 42_3 has a cylindrical shape centered on the central axis CA. The third portion 42_3 is interposed between the second coil end 22e2 and the first inner wall surface 30w1. The third portion 42_3 has a plurality of second holes H2 for injecting cooling oil toward the second coil end 22e2. The fourth portion 42_4 has a ring shape centered on the central axis CA. The fourth section 42_4 protrudes radially inward from the third section 42_3. The fourth section 42_4 is also interposed between the second coil end 22e2 and the third inner wall surface 30w3. Further explanation of the structure on the -x direction side with respect to the central plane CP is omitted here.

[0040] (operation) The operation of motor 1 is described below. Cooling oil stored in the cooling oil reservoir flows into the supply port 30p of housing 30 via a pump and supply pipe (not shown). Cooling oil supplied to supply port 30p flows into the annular channel 50r. The incoming cooling oil flows circumferentially within the annular channel 50r (see Figures 2 and 5, arrow A0). The cooling oil then flows into each of the multiple first channels 50c1 and flows in the +x direction (see Figure 2, arrow A1). Simultaneously, the cooling oil flows into each of the multiple second channels 50c2 and flows in the -x direction (see Figure 2, arrow A2). Cooling oil that reaches the +x end of the multiple first channels 50c1 is discharged into space SP1 and reaches the first annular member 41. Similarly, cooling oil that reaches the -x end of the multiple second channels 50c2 is discharged into space SP2 and reaches the second annular member 42.

[0041] Figure 3B is used to explain the cooling oil injection state. Since the space SP1 is completely filled with cooling oil, pressure is applied to the cooling oil. Cooling oil is injected from each of the multiple first holes H1 toward the first coil end 22e1. In Figure 3B, the flow rate of the cooling oil injected from the multiple first holes H1 is shown by vector JS1.

[0042] (effect) The conventional problems are explained below. If the insulation performance between the coil end and the inner wall surface of the housing is low, discharge may occur between the two. Therefore, in order to ensure insulation performance, it was necessary to secure a certain insulation distance between the coil end and the inner wall surface of the housing. This increased the size of the housing, leading to problems with mounting space in vehicles, etc., and increased costs. This problem was particularly pronounced when the coil conductor was exposed from the insulator (e.g., insulating coating) at the coil end. In this embodiment, the insulating first annular member 41 has a structure that includes a ring-shaped second portion 41_2 (see Figure 3A). The second portion 41_2 is interposed between the first coil end 22e1 and the second inner wall surface 30w2 of the housing 30. As a result, the discharge path between the first coil end 22e1 and the second inner wall surface 30w2 can be blocked by the insulator, thereby improving the insulation performance between the two. Compared to the case without the second part 41_2, the insulation distance ID between the first coil end 22e1 and the second inner wall surface 30w2 can be reduced, making it possible to miniaturize the housing 30. Furthermore, even when the end ED of the segment coil 22s is exposed from the insulating coating 26, the insulation performance can be ensured by the second part 41_2, thus reducing the insulation distance ID.

[0043] In this embodiment, multiple first holes H1 are positioned between the first end face 21e1 and the connecting portion 41c (see Figure 3A). This allows cooling oil to be injected into the space between the first end face 21e1 and the second portion 41_2. The cooling oil injected from the first holes H1 can be guided toward the first coil end 22e1 by the second portion 41_2. For example, as shown by the dotted arrow A3, the cooling oil injected axially can be deflected by the second portion 41 to reach the first coil end 22e1. This increases the amount of cooling oil that reaches the first coil end 22e1, thereby improving cooling efficiency. [Examples]

[0044] Figure 6 shows a schematic cross-sectional view of the motor 201 according to Embodiment 2. Figure 6 is a cross-sectional view of the same location as Figure 1 of Embodiment 1. Components common to Embodiment 2 and Embodiment 1 are given the same reference numerals, and their explanation is omitted. Components unique to Embodiment 2 are distinguished by their reference numerals in the 200s.

[0045] The second portion 41_2 of the first annular member 41 is in contact with the second inner wall surface 230w2. This minimizes the distance between the second portion 41_2 and the second inner wall surface 230w2. Compared to the insulation distance ID (Figure 3A) between the first coil end 22e1 and the second inner wall surface 30w2 in Example 1, the insulation distance ID 200 in Example 2 can be made smaller.

[0046] Similarly, the fourth portion 42_4 of the second annular member 42 is in contact with the third inner wall surface 230w3. Therefore, the distance between the fourth portion 42_4 and the third inner wall surface 230w3 can be minimized. This makes further miniaturization of the motor possible.

[0047] Furthermore, the second part 41_2 and the fourth part 42_4, which have similar shapes and functions, are positioned on both coil ends. Therefore, it is possible to ensure equivalent insulation and cooling performance at both coil ends. In addition, since the first annular member 41 and the second annular member 42 share common parts, cost reduction is possible. [Examples]

[0048] In Example 3, the shape of the second annular member 342 differs from that of Example 1. Components common to both Example 3 and Example 1 are given the same reference numerals, and their explanation is omitted. Components unique to Example 3 are distinguished by their reference numerals in the 300s. Figure 7 shows a schematic cross-sectional view of the motor 301 according to Example 3. Figure 7 is a cross-sectional view of the same location as in Figure 1 of Example 1.

[0049] The second annular member 342 in Example 2 includes a third portion 342_3. However, it does not include a portion corresponding to the fourth portion 42_4 in Example 1. Therefore, the second annular member 342 does not have a portion interposed between the second coil end 22e2 and the third inner wall surface 30w3 (see region R300). In other words, when viewed from the axial direction (x direction), the second annular member 342 and the second coil end 22e2 do not overlap.

[0050] (effect) The first coil end 22e1 has an end ED exposed from the insulating coating 26. On the other hand, the second coil end 22e2 is covered with the insulating coating 26. Therefore, the first coil end 22e1 is more prone to short circuits with the inner wall surface of the housing 30 than the second coil end 22e2. In the technology of this embodiment, the second portion 41_2 of the first annular member 41 makes it possible to improve the insulation of the first coil end 22e1 compared to the insulation of the second coil end 22e2. This makes it possible to insulate the first coil end 22e1 more thoroughly. Also, the second coil end 22e2 is insulated by the insulating coating 26. Therefore, the insulation distance ID 300 between the second coil end 22e2 and the third inner wall surface 30w3 can be made smaller than the insulation distance ID between the first coil end 22e1 and the second inner wall surface 30w2. This makes it possible to contribute to miniaturization of the overall size of the motor 301.

[0051] Although embodiments have been described in detail above, these are merely illustrative and do not limit the scope of the claims. The technologies described in the claims include various modifications and changes to the specific examples illustrated above. The technical elements described in this specification or drawings exhibit technical usefulness individually or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the technologies illustrated in this specification or drawings achieve multiple objectives simultaneously, and achieving even one of these objectives constitutes technical usefulness.

[0052] (modified version) The shapes of the openings of the first and second holes are not limited to circles and can be various shapes. Furthermore, the number and arrangement of the first and second holes are not limited to the embodiments described herein and can be various configurations.

[0053] The shapes of the through holes TH1-TH3 can vary. For example, they may be notched. The notched shape may have a portion where the opening communicates with the inner end 41_2i. Since each of the power lines 361-363 can be housed inside the notched portion via the connecting portion, the effort required for assembly can be reduced.

[0054] The insulator 27 covering the ends ED of the multiple segment coils 22s may be omitted. In this case, the conductors will be exposed at the ends ED, but insulation can be ensured by the second part 41_2.

[0055] The shape of the inner end 41_2i of the second part 41_2 may vary. For example, it may have a rib wall. [Explanation of Symbols]

[0056] 10: Rotor 11: Rotating shaft 20: Stator 21: Stator core 22: Coil 21e1: First end face 21e2: Second end face 22e1: First coil end 22e2: Second coil end 30: Housing 30w1: First inner wall surface 30w2: Second inner wall surface 30w: Inner wall surface 41: First annular member 41_1: First part 41_2: Second part H1: First hole

Claims

1. A stator having a stator core and coils, A housing for the stator, An insulating first annular member seals the space between the first end face of the stator core in the axial direction and the inner wall surface of the housing, A motor equipped with, The coil has a first coil end protruding from the first end face, The inner wall surface has a first inner wall surface facing radially with respect to the first coil end, and a second inner wall surface facing axially with respect to the first coil end. The first annular member is It has a cylindrical shape centered on the aforementioned axis, and a first portion interposed between the first coil end and the first inner wall surface, The first portion protrudes radially inward from the first portion and is interposed between the first coil end and the second inner wall surface, It is equipped with, The first part of the motor is provided with a plurality of first holes for injecting a refrigerant toward the first coil end.

2. The motor according to claim 1, wherein the plurality of first holes are located between the first end face and the portion to which the second portion is connected to the first portion.

3. The motor according to claim 1, wherein the first annular member is made of an insulating resin.

4. The coil comprises a plurality of segment coils, each having an insulating coating on its outer surface. The motor according to claim 1, wherein at the first coil end, each end of the plurality of segment coils is exposed from the insulating coating.

5. The motor according to claim 1, wherein the second part has a ring shape centered on the shaft.

6. The stator core has an inner circumferential surface that forms a cylindrical opening centered on the axis, The motor according to claim 5, wherein the radial inner end of the second ring-shaped portion is located radially outward from the inner circumferential surface of the stator core.

7. The motor according to claim 5, wherein the thickness of the radial inner end of the ring-shaped second portion is smaller than the thickness of the radial outer end of the second portion.

8. The motor according to claim 1, wherein at least a portion of the second part is in contact with the second inner wall surface.

9. The motor further comprises a plurality of power lines protruding axially from the first coil end, The motor according to claim 1, wherein the second portion comprises at least one through-hole or notch through which the plurality of power lines pass.

10. The stator core further comprises an insulating second annular member that seals the space between the first end face and the second end face located on the opposite side in the axial direction and the inner wall surface of the housing, The coil has a second coil end that protrudes from the second end face of the stator core, The first inner wall surface of the housing faces the second coil end in the radial direction. The inner wall surface of the housing further has a third inner wall surface that faces the second coil end in the axial direction. The second annular member is, It has a cylindrical shape centered on the aforementioned axis, and a third portion interposed between the second coil end and the first inner wall surface, A fourth portion that protrudes radially inward from the third portion and is interposed between the second coil end and the third inner wall surface, It is equipped with, The motor according to claim 1, wherein the third portion comprises a plurality of second holes for injecting refrigerant toward the second coil end.

11. The stator core further comprises an insulating second annular member that seals the space between the first end face and the second end face located on the opposite side in the axial direction and the inner wall surface of the housing, The coil has a second coil end that protrudes from the second end face of the stator core, The first inner wall surface of the housing faces the second coil end in the radial direction. The inner wall surface of the housing further has a third inner wall surface that faces the second coil end in the axial direction. The second annular member has a cylindrical shape centered on the axis and is interposed between the second coil end and the first inner wall surface. The second annular member is provided with a plurality of second holes for injecting refrigerant toward the second coil end, The motor according to claim 1, wherein the second annular member is not interposed between the second coil end and the third inner wall surface.

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