Motor

Abstract

A motor includes: a shaft; a rotor fixed to the shaft; a ring-shaped stator surrounding the central axis of the rotor; and a motor housing that accommodates the rotor and the stator. The motor housing has, on a surface facing the stator in the axial direction of the central shaft, a refrigerant flow path including at least a first flow path through which a refrigerant flows in the vertical direction, and a plurality of discharge portions for discharging the refrigerant from the refrigerant flow path toward the inside of the motor housing in the axial direction.

Description

Technical Field

[0001] The present disclosure relates to a motor. Background Art

[0002] Japanese Unexamined Patent Application Publication No. 2019-41487 discloses a circular ring disposed at an end portion inside a motor housing for cooling the inside of the motor.

[0003] If such a circular ring is provided inside the motor housing, the volume of the motor unit may increase. In addition, since it is circular, the positions and the number of refrigerant discharge portions may be limited. Summary of the Invention

[0004] The present disclosure provides a technique for efficiently cooling a cooling object by optimizing a refrigerant discharge portion and the like while suppressing a space for cooling in a motor.

[0005] According to an embodiment of the present disclosure, a motor includes: a shaft; a rotor fixed to the shaft; a stator surrounding a central axis of the rotor and having a ring shape; and a motor housing housing the rotor and the stator. The motor housing has a refrigerant flow path including at least a first flow path through which a refrigerant flows in a vertical up-and-down direction on a surface facing the stator along the axial direction of the central axis, and a plurality of discharge portions that discharge the refrigerant from the refrigerant flow path toward the inside of the motor housing along the axial direction.

[0006] According to the motor, the refrigerant is directly discharged to the stator or the like from a surface of the motor housing facing the stator in the axial direction via the refrigerant flow path. By providing such a refrigerant flow path on this surface, it is possible to design the refrigerant flow path and the pattern of the discharge portions according to the cooling portion and the degree of cooling thereof, thereby achieving efficient cooling. In addition, an increase in the space required for cooling due to an increase in the refrigerant discharge portions can be suppressed. Brief Description of the Drawings

[0007] Hereinafter, features, advantages, techniques, and industrial significance of exemplary embodiments of the present invention will be described with reference to the drawings, in which the same reference numerals denote the same components, and:

[0008] Figure 1 is a cross-sectional view showing an embodiment of a refrigerant flow path and discharge portions of a cover provided on a motor housing.

[0009] Figure 2 is a diagram showing an example of a pattern of a refrigerant flow path and discharge portions.

[0010] Figure 3 is a diagram showing an example of a pattern of discharge portions for a stator and a rotor.

[0011] Figure 4This is a diagram showing another example of the pattern of the refrigerant flow path and the discharge portion.

[0012] Figure 5 This is a diagram showing another example of the pattern of the discharge portion for the stator and the rotor.

[0013] Figure 6 This is a diagram showing another example of the pattern of the discharge portion for the stator and the rotor.

[0014] Figure 7 This is a cross-sectional view showing an embodiment of discharging the refrigerant via a resolver.

[0015] Figure 8 This is a diagram showing an example of the connection flow path and the discharge portion formed in the resolver. Detailed Embodiment

[0016] According to an embodiment of the present disclosure, a motor includes: a rotor fixed to a shaft; a stator surrounding a central axis of the rotor and having an annular shape; and a motor housing housing the rotor and the stator. The motor housing has a refrigerant flow path including at least a first flow path for the refrigerant to flow in the vertical up-and-down direction on a surface facing the stator along the axial direction of the central axis, and a plurality of discharge portions for discharging the refrigerant from the refrigerant flow path toward the inside of the motor housing along the axial direction.

[0017] The refrigerant flow path may include at least one second flow path branched from the first flow path. At least one of the plurality of discharge portions may be located in the at least one second flow path. In this way, the pattern of the refrigerant flow path and the discharge portion can be designed with higher degrees of freedom, achieving efficient cooling.

[0018] The motor housing may include a cover on a surface facing the stator along the axial direction. The refrigerant flow path may be provided inside the cover. The plurality of discharge portions may be holes communicating with the refrigerant flow path inside the cover. In this way, it is possible to both suppress an increase in the space for cooling and increase the refrigerant circulation and discharge portions.

[0019] The plurality of discharge portions may include holes for discharging the refrigerant toward the coil ends of the stator. In this way, it is possible to cool the coil ends where the temperature is likely to rise.

[0020] The plurality of discharge portions may include holes for discharging the refrigerant toward the inner peripheral side of the coil ends of the stator. In this way, it is possible to effectively cool the coil ends, which are difficult to cool in the past, from the inner peripheral side.

[0021] The above-mentioned motor may include a bearing for the shaft. The above-mentioned plurality of discharge portions may include holes for discharging the refrigerant to the bearing for lubricating the bearing. In this way, the lubricity of the bearing and the cooling can be improved simultaneously.

[0022] The above-mentioned plurality of discharge portions may include a plurality of holes with different hole diameters. In this way, the discharge amount and discharge pressure of the refrigerant can be changed according to the degree of cooling. The plurality of holes with different hole diameters may include a first hole having a first hole diameter and a second hole having a second hole diameter different from the first hole diameter. The first hole may discharge the refrigerant above a portion of the coil end of the stator disposed above the vertical direction. The second hole may discharge the refrigerant below a portion of the coil end of the stator disposed below the vertical direction. In this way, the coil ends can be cooled regardless of whether it is above or below in the vertical direction.

[0023] The above-mentioned motor may further include a rotation angle sensor unit, which includes a rotation angle sensor for detecting the rotation angle of the rotor and a protective cover installed on the rotation angle sensor. The protective cover may include a communication flow path communicating with the refrigerant flow path. The discharge portion may include a plurality of holes provided in the communication flow path. The plurality of holes discharge the refrigerant from the communication flow path toward the coil ends of the stator. In this way, even when the rotation angle sensor unit is provided, the remaining space near the coil ends can be used to efficiently cool the coil ends. At least one of the plurality of holes may discharge the refrigerant toward the inner peripheral side of the coil end. In this way, the inner peripheral side of the coil end can be efficiently cooled.

[0024] Hereinafter, the motor disclosed in this specification will be described with appropriate reference to the drawings. In the specification, the motor is not particularly limited. For example, it may be a driving motor mounted on an electric vehicle or a part of an eAxle (eAxle), etc. The electric vehicle is a BEV (Battery Electric Vehicle), HEV (Hybrid Electric Vehicle), PHEV (Plug-in Hybrid Electric Vehicle), FCEV (Fuel_Cell Electric Vehicle), etc. Sometimes, the upper part in the vertical direction when the motor is mounted on the vehicle is simply referred to as "upper", etc. Similarly, the lower part in the vertical direction is simply referred to as "lower", etc. In addition, in this specification, the "axial direction" only refers to the direction parallel to the central axis of the rotor included in the motor. Among them, in the drawings, the upper part in the vertical direction, the lower part in the vertical direction, and one side and the other side in the vehicle width direction are respectively represented as "UP", "DW", "W1", and "W2".

[0025] (First Embodiment)

[0026] In the first embodiment, the refrigerant is directly discharged from the cover 22 of the motor housing 20 toward the coil ends 10a, 10b. Figure 1 This is a cross-sectional view of a plane including the central axis Z, showing the vicinity of the coil ends 10a, 10b on the non-output side of the motor 2 and the cover 22. Figure 2 This shows an example of each pattern of the refrigerant flow path (hereinafter simply referred to as the flow path) 40 and the discharge portion 50 in the cover 22. Figure 3 This shows an example of the pattern of the discharge portion 50 for the rotor 6 and the stator 8.

[0027] As Figure 1 shown, the motor 2 includes a rotor 6 and a stator 8 and is housed in the motor housing 20.

[0028] The rotor 6 is supported by a shaft 4 extending along the central axis Z which also serves as the rotation axis of the rotor 6 so as to be rotatable. In Figure 1 this, one end of the shaft 4 is mounted to the cover 22 of the motor housing 20 via a bearing 30. The rotor 6 has a structure well-known to those skilled in the art. In addition, an end plate 7 is provided on the end face of the rotor 6 facing the cover 22 in the axial direction as needed. The extending direction of the central axis Z is not particularly limited, and for example, the central axis Z is configured to be horizontal.

[0029] The stator 8 is integrally formed as an annular body around the central axis Z. The stator 8 has a stator core 8a and a coil 10 mounted on the stator core 8a. The stator core 8a is a circular annular body around the central axis Z, extends along the axial direction of the central axis Z, and surrounds the outer peripheral surface of the rotor 6. The stator core 8a has, for example, a plurality of teeth (not shown) protruding radially inward along its circumferential direction.

[0030] The coil 10 is mounted, for example, by winding a wire around the teeth of the stator core 8a. The coil 10 protrudes from the axial end face 9 of the stator core 8a to form coil ends 10a, 10b. Among them, the coil end 10a is the protruding portion of the coil 10 of the stator 8 disposed above the vertical direction, and the coil end 10b is the protruding portion of the coil 10 of the stator 8 disposed below the vertical direction. Although not shown, the coil 10 also protrudes from the end face of the stator core 8a on the side opposite to the end face 9 in the axial direction to form a coil end.

[0031] The motor housing 20 has a shape for housing the entire motor 2. The motor housing 20 has a cylindrical body along the axial direction of the motor 2, that is, a housing main body 20a, and a cover 22 that covers the non-output side of the motor 2 along the axial direction of the housing main body 20a. The non-output side is the end of the motor 2 along the axial direction of the shaft 4 that is not connected to a gear unit (not shown). And, although not shown, the motor housing 20 has a cover that covers the output side of the motor 2. The motor housing 20 is made of a metal material such as aluminum.

[0032] The housing main body 20a holds the stator core 8a from its radially outer side. The cover 22 has a form that covers the non-output side end portion of the motor 2. The cover 22 supports the shaft 4 rotatably. Further, a bearing 30 is mounted around the shaft 4 on the inner surface 22a of the cover 22 that faces the stator 8 in the axial direction. The other cover (not shown) also supports the shaft 4 rotatably.

[0033] As Figures 1 to 3 shown, a flow path 40 through which refrigerant flows and a discharge portion 50 for discharging the refrigerant are provided inside the cover 22. Figure 2 The pattern of the flow path 40 inside the cover 22 is illustrated. As Figure 2 shown, the flow path 40 has a vertical flow path 42 that extends in the vertical up-and-down direction inside the cover 22 and branch flow paths 44 that branch off from the vertical flow path 42. The vertical flow path 42 is an example of the first flow path disclosed in this specification, and the branch flow paths 44 are examples of the second flow path disclosed in this specification.

[0034] The vertical flow path 42, for example, intersects the central axis Z and extends linearly up and down in the vertical direction. Thereby, the refrigerant can be easily discharged to a desired portion either alone or in combination with the branch flow paths 44. A plurality of vertical flow paths 42 may be provided.

[0035] The branch flow paths 44 are flow paths that branch off from an arbitrary portion of the vertical flow path 42. The branch flow paths 44 may be one or two or more. Further, the flow path pattern of the branch flow paths 44 is not particularly limited. For example, as Figure 2 shown, the branch flow paths 44 are respectively provided above and below the vertical flow path 42 in the vertical direction. Thereby, it is easy to discharge the refrigerant to the coil ends 10a and 10b respectively. In Figure 2 , the branch flow paths 44a, 44b extend obliquely from both sides of the vertical flow path 42 at an arbitrary height position of the vertical flow path 42 in one direction (upward in Figure 2 ), and the branch flow paths 44c, 44d also extend obliquely in one direction (upward in Figure 2 ) at other height positions.

[0036] The branch flow paths 44, as Figure 2 shown, for example, the front end portions thereof may be closed inside the cover 22 or may open to the outside of the cover 22. The branch flow paths 44 may be orthogonal to the vertical flow path 42, or may extend obliquely downward or obliquely upward. The branch flow paths 44 may extend linearly and / or in a curve.

[0037] The pattern of the flow path 40 is not particularly limited as long as it has at least one vertical flow path 42. It can be appropriately set according to the cooling target portion of the motor 2.

[0038] A refrigerant for cooling the motor 2 is supplied to the flow path 40 from the outside of the motor housing 20. For example, the refrigerant is supplied to the flow path 40 from a cooling system such as an e-axle including the motor 2 (not shown). The cooling system includes the motor 2, a flow path for circulating the refrigerant to cool a gear unit (not shown), and a pump for pumping the refrigerant. Among them, in the Figures 1 to 3 shown motor 2, an oily cooling medium with lubricity is used as the refrigerant. Among them, in this specification, the refrigerant refers to a liquid cooling medium. In addition to using an oily cooling medium, an aqueous cooling medium can also be used.

[0039] The flow path 40 has a refrigerant inlet 40a through which the refrigerant flows from the cooling system into the flow path 40. As Figure 1 and Figure 2 shown, the refrigerant inlet 40a opens at the lower end of the vertical flow path 42. Among them, the openings of the flow path 40 other than the refrigerant inlet 40a are appropriately buried and sealed with plugs.

[0040] As Figures 1 to 3 shown, the flow path 40 has a discharge portion 50 composed of a plurality of holes. In Figures 2 to 3 the pattern of the discharge portion 50 is shown.

[0041] For example, as Figure 2 and Figure 3 shown, when observing the entire flow path 40, holes 51 to 53 and holes 54 to 56 are respectively formed as the discharge portion 50 above and below the vertical direction. These holes 51 to 56 all communicate the inside of the branch flow paths 44a, 44b, 44c, 44d with the inside of the motor housing 20. Holes 51 and 53 open in the branch flow paths 44a and 44b. Hole 52 opens in the vertical flow path 42. Holes 54 and 56 open in the branch flow paths 44c and 44d. Hole 55 opens in the vertical flow path 42.

[0042] As Figures 1 to 3 shown, the holes 51 to 53 in the discharge portion 50 open at positions where the refrigerant can be discharged to the inner peripheral side of the coil end 10a. In addition, the holes 51 to 53 are located on the side closer to the central axis Z than the coil end 10a. The holes 54 to 56 open at positions where the refrigerant can be discharged to the inner peripheral side of the coil end 10b. In addition, the holes 54 to 56 are located on the side closer to the central axis Z than the coil end 10b. The holes 51 to 53 are an example of the first holes in this specification. The holes 54 to 56 are an example of the second holes in this specification.

[0043] In addition, for example, although the holes 51 to 53 are not particularly limited, they have a circular opening shape with the same hole diameter. The holes 54 to 56 have a circular opening shape with a hole diameter smaller than that of the holes 51 to 53 and the same hole diameter as each other. The hole diameter of the holes 51 to 53 is an example of the first hole diameter in this specification. The hole diameter of the holes 54 to 56 is an example of the second hole diameter in this specification.

[0044] Moreover, a hole 57 is provided at one place in the vertical flow path 42, and the hole 57 communicates with a part of the bearing 30 mounted on the shaft 4. The hole 57 is formed so as to be able to discharge the refrigerant toward the rolling element holding portion of the bearing 30. Thus, the hole 57 can lubricate and cool the rolling elements of the bearing 30 with the refrigerant. The hole 57 has a circular opening shape with a hole diameter smaller than that of the holes 54 to 56. The hole 57 is located closer to the center side than the holes 51 to 53 and the holes 54 to 56.

[0045] Next, the functions of the motor 2 will be described. According to this motor 2, when the refrigerant is supplied from the refrigerant inlet 40a of the flow path 40, it is pressure-fed upward from below in the flow path 40 at a specified discharge pressure. Thus, the refrigerant is discharged from the holes 54 to 56, the holes 51 to 53, and the hole 57, respectively. By discharging the refrigerant from the holes 54 to 56 toward the inner peripheral side of the coil end 10b, the refrigerant cools the coil end 10b from the inner peripheral side. In addition, by discharging from the holes 51 to 53 toward the inner peripheral side of the coil end 10a, the refrigerant cools the coil end 10a from the inner peripheral side.

[0046] Regarding the holes 54 to 56, although the hole diameter is smaller than that of the holes 51 to 53, since they are close to the refrigerant inlet 40a, the discharge pressure is high. Therefore, the coil end 10b is sufficiently cooled. Regarding the holes 51 to 53, since the hole diameter is larger than that of the holes 54 to 56 and more refrigerant can be discharged, the coil end 10a, which has a greater tendency to become hot, is sufficiently cooled.

[0047] Moreover, the refrigerant is discharged from the hole 57 toward the rolling element holding portion of the bearing 30. In the motor 2, since an oily medium is used as the refrigerant, the lubricating performance of the bearing 30 can be maintained or improved and cooling can be performed.

[0048] In this way, in the motor 2, the refrigerant in an amount corresponding to the degree of cooling is discharged to any cooling target portions such as the coil ends 10a and 10b. In addition, the refrigerant is also discharged for the lubrication of the bearing 30.

[0049] The flow path 40 has a vertical flow path 42. Therefore, the refrigerant can flow upward and downward in the vertical direction. In addition, since the vertical flow path 42 is provided, the refrigerant can be freely discharged to any cooling target part above, in the center, and below in the vertical direction. By providing the vertical flow path 42 and the branch flow path 44, the refrigerant can also be freely discharged to the cooling target parts around the vertical flow path 42.

[0050] In addition, both the flow path 40 and the discharge part 50 are formed within the range of the thickness along the axial direction inside the cover 22. Therefore, it is possible to avoid forming a cooling flow path and a pipe for discharge on the inner surface of the cover 22, and the axial distance (for example, the distance in the vehicle width direction) between the cover 22 and the coil ends 10a, 10b within the motor housing 20 can be reduced.

[0051] In the first embodiment, the flow path 40 and the discharge part 50 are formed inside the cover 22, but it is not limited thereto. There is also a case where a flow path 40 that is convex toward the motor 2 is formed on the inner surface of the cover 22, and a discharge part 50 including a plurality of holes and pipes for discharging the refrigerant is formed in the flow path 40.

[0052] In the first embodiment, the flow path 40 has a refrigerant inlet 40a at the lower end of the vertical flow path 42, and the refrigerant flows upward from below, but the refrigerant inlet 40a can be set at any position of the flow path 40. In addition, the flow direction of the refrigerant in the flow path 40 can also be from above to below, and it is not particularly limited otherwise.

[0053] In the first embodiment, it has Figure 2 the flow path 40 of the shown pattern, but it is not limited thereto. As long as there is at least one vertical flow path 42, it is not particularly limited. The pattern of the flow path 40 can be appropriately set according to the cooling target parts of the motor 2. For example, it is also possible to adopt Figure 4 the pattern of the flow path 40 shown. This flow path 40 has a vertical flow path 42 and branch flow paths 44e, 44f, 44g, 44h. The branch flow paths 44e, 44f extend obliquely from both sides of the vertical flow path 42 at an arbitrary height position above the vertical flow path 42 in one direction (downward in Figure 4 ), and the branch flow paths 44g, 44h extend obliquely from both sides of the vertical flow path 42 at an arbitrary height position below the vertical flow path 42 in the other direction (upward in Figure 4 ).

[0054] The pattern of the holes of the discharge part 50 is not particularly limited either. The holes are formed in various patterns in the vertical flow path 42 and / or the branch flow paths 44 according to the cooling target parts of the motor 2. It can be formed to discharge the refrigerant not only to the outer peripheral side and the front end part in addition to the inner peripheral side of the coil ends 10a, 10b. For example, it can be as Figure 4 andFigure 5 As shown, it includes a plurality of holes 60 to 67 that can discharge the refrigerant to the inner peripheral sides of the coil ends 10a and 10b, and can be as Figure 6 shown, including a plurality of holes 70 to 76 that point to the outer peripheral surfaces of the coil ends 10a and 10b.

[0055] The opening area such as the hole diameter of the discharge part 50 is not particularly limited. It can be appropriately set in consideration of the cooling target part, the discharge pressure of the refrigerant, the cooling degree, etc.

[0056] (Second Embodiment)

[0057] In the second embodiment, the refrigerant supplied to the cover 122 of the motor housing 120 is discharged toward the coil end 10b via the resolver 80. Figure 7 It shows a cross-section near the flow path 140 provided in the cover 122 disposed on the non-output side of the motor 102 and the coil ends 10a and 10b. Figure 8 It shows Figure 7 the cross-section along line A - A in. Among them, regarding the elements common to the first embodiment, the same reference numerals are used and their descriptions are omitted. The description will be centered on the points different from the first embodiment.

[0058] The motor 102 includes a motor housing 120, a flow path 140, a resolver 80, and a connection channel 90. The motor 102 has a shaft 4, a rotor 6, and a stator 8 having the same structure as that of the first embodiment. The cover 122 included in the motor housing 120 has a fixing portion 124 for fixing the resolver 80 to the surface of the cover 122 facing the motor 2. The fixing portion 124 has a concave portion 124a. The concave portion 124a fits and fixes the resolver 80 in a manner that the resolver 80 can operate.

[0059] The flow path 140 has a vertical flow path 142. The vertical flow path 142 has a refrigerant inlet 142a at its upper end. The vertical flow path 142 has a connection portion 148 for connecting the connection channel 90 of the resolver 80. The connection portion 148 is formed below the resolver 80. The connection portion 148 has a concave shape that can insert and liquid-tightly seal the connection channel 90 of the resolver 80 to be described later. For liquid-tight sealing, a sealing member such as an O-ring (not shown) is disposed between the inner peripheral surface of the connection portion 148 and the outer peripheral surface of the connection channel 90.

[0060] The resolver 80 is fixed to the shaft 4 so as to face the rotor 6 axially. The outer periphery of the resolver 80 is surrounded by the coil ends 10a and 10b. The resolver 80 includes a rotor 82, a stator 84, and a protective cover 86. The rotor 82 is fixed to the shaft 4, and the stator 84 is an annular body around the central axis Z. The protective cover 86 is an annular body that covers the coil ends of the stator 84 and is formed of a resin material or the like. The resolver 80 is an example of the rotation angle sensor unit disclosed in this specification.

[0061] As Figure 7 and Figure 8 shown, the protective cover 86 has a communication flow path 90 at the lower edge. The communication flow path 90 is a cylindrical pipe extending along the axial direction. The communication flow path 90 is formed at an end portion 88 where a part of the lower edge of the protective cover 86 extends radially outward. The communication flow path 90 is arranged to face the inner peripheral surface of the coil end 10b of the stator 84. The communication flow path 90 is provided at the lower end edge of the protective cover 86 by integral molding or the like.

[0062] The end portion of the communication flow path 90 that faces the rotor 6 axially is closed. The end portion of the communication flow path 90 that faces the cover 122 is open, forming a communication portion 92 with the flow path 140.

[0063] The discharge portion 150 includes a plurality of holes 93, 94, 95 provided in the communication flow path 90. The holes 93 to 95 are formed in the peripheral wall of the communication flow path 90 that faces the inner peripheral surface of the coil end 10b. The holes 93 to 95 are open at positions where the refrigerant can be discharged from the communication flow path 90 toward the inner peripheral side of the coil end 10b. The holes 93 to 95 are located closer to the center side than the coil end 10b and are provided at positions axially overlapping with the coil end 10b.

[0064] Next, the operation of the motor 102 will be described. The refrigerant is supplied from the refrigerant inlet 140a to the vertical flow path 142, reaches the communication flow path 90 via the connection portion 148 and the communication portion 92. The refrigerant is discharged from the holes 93 to 95 toward the inner peripheral surface of the coil end 10b. Since the refrigerant is discharged to the inner peripheral surface of the coil end 10b, the coil end 10b can be effectively cooled. In addition, the space where the resolver 80 is arranged can be effectively utilized to discharge the refrigerant to the coil end 10b. Therefore, even if the resolver 80 is provided, the axial distance (for example, the distance in the vehicle width direction) between the motor 102 and the cover 122 can be reduced.

[0065] In the second embodiment, the communication flow path 90 is configured to be provided only at the lowermost part of the protective cover 86 of the resolver 80, but it is not limited thereto. One or two or more holes serving as the communication flow path 90 and the discharge portion 150 can be provided at any position of the protective cover 86 as needed. In this case, it may be necessary to form a branch flow path for the vertical flow path 142.

[0066] In the second embodiment, the holes 93 to 95 are formed on the peripheral wall of the communication flow path 90 so as to point to the inner peripheral side of the coil end 10b, but it is not limited thereto. The discharge portion 150 can be formed to point to other parts of the coil end 10b, such as a cooling target part, as needed.

[0067] In the second embodiment, the discharge mode of the refrigerant via the resolver 80 is shown, but it may also include various modes of the flow path 140 and the discharge portion 50 in the first embodiment. In addition, in the second embodiment, various modified modes in the first embodiment can also be included.

[0068] According to the disclosure of this specification, this specification can include the following configurations.

[0069] Appendix 1

[0070] A motor, comprising:

[0071] A rotor fixed to a shaft;

[0072] A stator surrounding the central axis of the rotor and having an annular shape; and

[0073] A motor housing accommodating the rotor and the stator,

[0074] The motor housing has a refrigerant flow path including at least a first flow path for allowing refrigerant to flow vertically in the vertical direction on a surface facing the stator along the axial direction of the central axis, and a plurality of discharge portions for discharging the refrigerant from the refrigerant flow path toward the inside of the motor housing along the axial direction.

[0075] Appendix 2

[0076] According to the motor described in Appendix 1, wherein

[0077] The refrigerant flow path includes at least one second flow path branched from the first flow path,

[0078] At least one of the plurality of discharge portions is located in the at least one second flow path.

[0079] Appendix 3

[0080] According to the motor described in Appendix 1 or 2, wherein

[0081] The above-mentioned motor housing is provided with a cover on the surface facing the above-mentioned stator along the above-mentioned axial direction.

[0082] The above-mentioned refrigerant flow path is provided inside the above-mentioned cover.

[0083] The above-mentioned plurality of discharge portions are holes in the above-mentioned cover that communicate with the above-mentioned refrigerant flow path.

[0084] Appendix 4

[0085] The motor according to any one of Appendices 1 to 3, wherein

[0086] The above-mentioned plurality of discharge portions include holes that discharge the above-mentioned refrigerant toward the coil ends of the above-mentioned stator.

[0087] Appendix 5

[0088] The motor according to any one of Appendices 1 to 4, wherein

[0089] The above-mentioned plurality of discharge portions include holes that discharge the above-mentioned refrigerant toward the inner peripheral side of the coil ends of the above-mentioned stator.

[0090] Appendix 6

[0091] The motor according to any one of Appendices 1 to 5, wherein

[0092] The above-mentioned plurality of discharge portions include holes that discharge the above-mentioned refrigerant toward the above-mentioned bearings for lubrication of the above-mentioned shaft.

[0093] Appendix 7

[0094] The motor according to any one of Appendices 1 to 6, wherein

[0095] The above-mentioned plurality of discharge portions include a plurality of holes with different hole diameters.

[0096] Appendix 8

[0097] The motor according to Appendix 7, wherein

[0098] The above-mentioned plurality of holes with different hole diameters include a first hole having a first hole diameter and a second hole having a second hole diameter different from the above-mentioned first hole diameter.

[0099] The above-mentioned first hole discharges the above-mentioned refrigerant toward the coil end portion of the above-mentioned stator disposed above in the vertical direction.

[0100] The above-mentioned second hole discharges the above-mentioned refrigerant toward the coil end portion of the above-mentioned stator disposed below in the vertical direction.

[0101] Appendix 9

[0102] The motor according to any one of Appendices 1 to 8, wherein

[0103] It also has a rotation angle sensor unit, which has a rotation angle sensor for detecting the rotation angle of the rotor and a protective cover mounted on the rotation angle sensor.

[0104] The protective cover has a communication flow path communicating with the refrigerant flow path.

[0105] The discharge portion includes a plurality of holes provided in the communication flow path.

[0106] The plurality of holes discharge the refrigerant from the communication flow path toward the coil end of the stator.

[0107] Appendix 10

[0108] The motor according to Appendix 9, wherein

[0109] At least one of the plurality of holes discharges the refrigerant toward the inner peripheral side of the coil end.

[0110] As described above, specific examples of the present disclosure have been described in detail, but these are merely examples and do not limit the scope of protection claimed in the present application. The technology described in the scope of protection claimed in the present application includes technologies obtained by various modifications and changes to the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical usefulness alone or through various combinations, and are not limited to the combinations described in the technical solution at the time of application. The technology illustrated in this specification or the drawings can achieve multiple purposes simultaneously, and achieving one of the purposes itself has technical usefulness.

Claims

1. A motor, characterized in that, Comprising: A shaft; A rotor, fixed to the shaft; A stator, surrounding the central axis of the rotor and annular; And A motor housing, housing the rotor and the stator, Wherein, The motor housing has, on a surface facing the stator along the axial direction of the central axis, a refrigerant flow path including at least a first flow path for refrigerant to flow in the vertical up-and-down direction, and a plurality of discharge portions for discharging the refrigerant from the refrigerant flow path toward the inside of the motor housing along the axial direction.

2. The motor according to claim 1, wherein The refrigerant flow path includes at least one second flow path branched from the first flow path, At least one of the plurality of discharge portions is located in the at least one second flow path.

3. The motor according to claim 1, wherein The motor housing has a cover on a surface facing the stator along the axial direction, The refrigerant flow path is inside the cover, The plurality of discharge portions are holes communicating with the refrigerant flow path in the cover.

4. The motor according to claim 1, wherein The plurality of discharge portions include holes for discharging the refrigerant toward the coil ends of the stator.

5. The motor according to claim 1, wherein The plurality of discharge portions include holes for discharging the refrigerant toward the inner circumferential side of the coil ends of the stator.

6. The motor according to claim 1, wherein It further includes a bearing for the shaft, Wherein, The plurality of discharge portions include holes for discharging the refrigerant to the bearing for lubrication of the bearing.

7. The motor according to claim 1, wherein The plurality of discharge portions include a plurality of holes with different diameters.

8. The motor according to claim 7, wherein The plurality of holes with different diameters include a first hole having a first diameter and a second hole having a second diameter different from the first diameter, The first hole discharges the refrigerant toward an upper portion above the coil end of the stator arranged in the upper part in the vertical direction, The second hole discharges the refrigerant toward a lower portion below the coil end of the stator arranged in the lower part in the vertical direction.

9. The motor according to claim 1, wherein It further includes a rotation angle sensor unit, which includes a rotation angle sensor for detecting the rotation angle of the rotor and a protective cover installed on the rotation angle sensor, Wherein, The protective cover has a communication flow path communicating with the refrigerant flow path, The discharge portions include a plurality of holes provided in the communication flow path, The plurality of holes discharge the refrigerant from the communication flow path toward the coil ends of the stator.

10. The motor according to claim 9, wherein At least one of the plurality of holes discharges the refrigerant toward the inner circumferential side of the coil end.

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