Motor

Abstract

To provide a technology which can optimize a discharge part of a coolant, etc. to efficiently cool a cooling object while restraining a space for cooling.SOLUTION: There is provided a motor comprising: a rotor 6 fixed to a shaft 4; a stator 8 which is annular to a center shaft of the rotor 6; and a motor case 20 which accommodates the rotor 6 and the stator 8. The motor case 20 comprises, on a surface facing the stator 8 in the axial direction of the center shaft, a coolant passage 40 at least including a first passage 42 through which a coolant flows in a vertical direction, and a plurality of discharge parts 50 which discharge the coolant in an axial direction toward the inside of the motor case 20 from the coolant passage 40.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Patent Document 1 discloses that an annular ring is disposed at the end of the motor case in order to cool the inside of the motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-41487 Summary of the Invention [Problem to be solved by the invention]

[0004] If such an annular ring is provided inside the motor case, the volume of the motor unit may increase. Also, because the ring is annular, the number and locations from which the refrigerant is discharged may be limited.

[0005] The present specification provides a technology that can efficiently cool a cooling target in a motor by optimizing the refrigerant discharge location and the like while minimizing the space required for cooling. [Means for solving the problem]

[0006] The technology disclosed in this specification is embodied in a motor. The motor includes a rotor fixed to a shaft, a stator annular about a central axis of the rotor, and a motor case that houses the rotor and the stator. The motor case has, on a surface axially facing the stator and the central axis, a refrigerant flow path that includes at least a first flow path through which a refrigerant flows vertically, and a plurality of discharge ports that discharge the refrigerant from the refrigerant flow path toward the interior of the motor case in the axial direction.

[0007] In the motor, the refrigerant is discharged directly to the stator, etc., through the refrigerant flow path from the surface of the motor case that faces the stator in the axial direction. By providing such a refrigerant flow path on this surface, the pattern of the refrigerant flow path and discharge portion can be designed according to the areas to be cooled and the degree of cooling, enabling efficient cooling. Furthermore, an increase in the space required for cooling can be suppressed even when the number of refrigerant discharge areas increases. [Brief explanation of the drawings]

[0008] [Figure 1] 4 is a cross-sectional view showing an embodiment of a refrigerant flow path and a discharge portion provided in a cover of a motor case. FIG. [Figure 2] 5A and 5B are diagrams illustrating an example of a pattern of a refrigerant flow path and a discharge portion. [Figure 3] 10A and 10B are diagrams showing an example of a pattern of ejection portions for a stator and a rotor. [Figure 4] 10A and 10B are diagrams showing another example of the pattern of the refrigerant flow path and the discharge portion. [Figure 5] 10A and 10B are diagrams showing another example of a pattern of ejection portions for a stator and a rotor. [Figure 6] 10A and 10B are diagrams showing another example of a pattern of ejection portions for a stator and a rotor. [Figure 7] FIG. 10 is a cross-sectional view showing an embodiment in which refrigerant is discharged through a resolver. [Figure 8] 10A and 10B are diagrams illustrating an example of a communication flow path and a discharge portion formed in a resolver. DETAILED DESCRIPTION OF THE INVENTION

[0009] One embodiment of the motor disclosed in this specification comprises a rotor fixed to a shaft, a stator that is annular about a central axis of the rotor, and a motor case that houses the rotor and stator, wherein the motor case has, on a surface that faces the stator in the axial direction of the central axis, a refrigerant flow path that includes at least a first flow path through which refrigerant flows in a vertical direction, and a plurality of discharge portions that discharge the refrigerant from the refrigerant flow path in the axial direction toward the interior of the motor case.

[0010] In another embodiment of the motor, the refrigerant flow path includes at least one second flow path branching from the first flow path, and at least one of the plurality of discharge ports is located in the at least one second flow path, which allows for more freedom in designing the patterns of the refrigerant flow path and the discharge ports, enabling efficient cooling.

[0011] In another embodiment of the motor, the motor case includes covers on opposing surfaces in the axial direction, the refrigerant flow path is provided inside the covers, and the plurality of discharge ports are holes that communicate with the refrigerant flow path inside the covers. This allows the refrigerant to flow through and discharge areas to be increased while suppressing an increase in the cooling space.

[0012] In another embodiment of the motor, the plurality of discharge portions include holes that discharge the coolant toward coil ends of the stator. This makes it possible to cool the coil ends, which are prone to temperature rise.

[0013] In another embodiment of the motor, the plurality of discharge portions include holes that discharge the coolant toward inner circumferential sides of coil ends of the stator, thereby making it possible to effectively cool the coil ends, which have traditionally been difficult to cool, from the inner circumferential sides.

[0014] In another embodiment of the motor, the plurality of discharge portions include holes for discharging the refrigerant to a bearing of the shaft for lubrication of the bearing, thereby improving the lubrication of the bearing while cooling it.

[0015] In another embodiment of the motor, the plurality of discharge portions include a plurality of holes with different diameters. This allows the discharge amount and discharge pressure of the refrigerant to be changed depending on the degree of cooling. In this embodiment, the plurality of holes with different diameters may include a first hole having a first diameter and a second hole having a second diameter different from the first diameter, and the first hole may discharge the refrigerant toward a coil end portion located vertically above the stator, and the second hole may discharge the refrigerant toward a coil end portion located vertically below the stator. This allows the coil end to be cooled regardless of whether it is located vertically above or below the stator.

[0016] Another embodiment of the motor further includes a rotation angle sensor unit having a rotation angle sensor that detects the rotation angle of the rotor and a protective cover attached to the rotation angle sensor, the protective cover having a communication passage that communicates with the refrigerant passage, and the multiple holes including a hole that discharges the refrigerant from the communication passage toward the coil ends of the stator. This allows the coil ends to be efficiently cooled by utilizing the remaining space near the coil ends, even when the motor includes a rotation angle sensor unit. In this embodiment, the multiple holes include the opening that discharges the refrigerant toward the inner periphery of the coil ends. This allows the inner periphery of the coil ends to be efficiently cooled.

[0017] The motor disclosed in this specification will be described below with reference to the accompanying drawings. In this specification, the term "motor" is not particularly limited, but may be, for example, a traction motor mounted on an electric vehicle or part of an e-axle. Examples of electric vehicles include battery electric vehicles (BEVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and battery electric vehicles (FCEVs). The vertically upward direction of a motor mounted on a vehicle may be simply referred to as "upward," and similarly, the vertically downward direction may be simply referred to as "downward." Furthermore, in this specification, the term "axial direction" simply refers to the direction parallel to the central axis of the rotor of the motor. In the drawings, the vertically upward direction, the vertically downward direction, and one and the other of the width directions of the vehicle are indicated as "UP," "DW," "W1," and "W2," respectively.

[0018] (First embodiment) In the first embodiment, refrigerant is discharged directly from the cover 22 of the motor case 20 toward the coil ends 10a, 10b. Fig. 1 is a cross-sectional view taken along a plane including the central axis Z, showing the coil ends 10a, 10b on the non-output side of the motor 2 and the vicinity of the cover 22. Fig. 2 shows an example of the patterns of the refrigerant flow paths (hereinafter simply referred to as flow paths) 40 and discharge portions 50 in the cover 22. Fig. 3 shows an example of the pattern of the discharge portions 50 toward the rotor 6 and the stator 8.

[0019] As shown in FIG. 1, the motor 2 includes a rotor 6 and a stator 8 and is housed in a motor case 20.

[0020] The rotor 6 is rotatably supported by a shaft 4 extending along a central axis Z, which is also the rotation axis of the rotor 6. In FIG. 1, one end of the shaft 4 is attached to a cover 22 of a motor case 20 via a bearing 30. The rotor 6 has a configuration known to those skilled in the art. An end face of the rotor 6 that faces the cover 22 in the axial direction is provided with an end plate 7 as needed. The direction in which the central axis Z extends is not particularly limited, but the rotor 6 may be arranged so that the central axis Z is horizontal, for example.

[0021] The stator 8 as a whole is configured as an annular body about the central axis Z. The stator 8 has a stator core 8a and coils 10 attached to the stator core 8a. The stator core 8a is an annular body about the central axis Z, extends along the axial direction along 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) that protrude radially inward along its circumferential direction.

[0022] The coil 10 is attached, for example, by winding a conducting wire around the teeth of the stator core 8a. The coil 10 protrudes from an axial end face 9 of the stator core 8a to form coil ends 10a and 10b. The coil end 10a is the protruding portion of the coil 10 arranged vertically above the stator 8, and the coil end 10b is the protruding portion of the coil 10 arranged vertically below the stator 8. Although not shown, the coil 10 also protrudes from the end face of the stator core 8a opposite to end face 9 in the axial direction to form a coil end.

[0023] The motor case 20 is configured to accommodate the entire motor 2. The motor case 20 has a case body 20a, which is a cylindrical body that extends along the axial direction of the motor 2, and a cover 22 that covers the non-output side of the motor 2 along the axial direction of the case body 20a. The non-output side refers to the end of the shaft 4 that extends along the axial direction and is not connected to a gear unit (not shown). Furthermore, although not shown, the motor case 20 has a cover that covers the output side of the motor 2. The motor case 20 is made of a metal material such as aluminum.

[0024] The case body 20a holds the stator core 8a from its radially outer side. The cover 22 is configured to cover the non-output end of the motor 2. The cover 22 rotatably supports the shaft 4. A bearing 30 is mounted around the shaft 4 on an inner surface 22a of the cover 22 that faces the stator 8 in the axial direction. The other cover (not shown) also rotatably supports the shaft 4.

[0025] 1 to 3, the cover 22 is provided with a flow path 40 through which a refrigerant flows and a discharge unit 50 that discharges the refrigerant inside. FIG. 2 shows an example of the pattern of the flow path 40 inside the cover 22. As shown in FIG. 2, the flow path 40 has a vertical flow path 42 that extends vertically inside the cover 22 and a branch flow path 44 that branches off from the vertical flow path 42. The vertical flow path 42 is an example of a first flow path disclosed in this specification, and the branch flow path 44 is an example of a second flow path disclosed in this specification.

[0026] The vertical flow path 42 extends linearly in the vertical direction, for example, intersecting the central axis Z. This allows the refrigerant to be easily discharged to a desired location, either alone or in combination with the branch flow path 44. A plurality of vertical flow paths 42 may be provided.

[0027] The branch flow passages 44 are flow passages that branch off from any location of the vertical flow passage 42. The number of branch flow passages 44 may be one or more. The flow passage pattern of the branch flow passages 44 is not particularly limited. For example, as shown in FIG. 2, the branch flow passages 44 may be provided vertically above and below the vertical flow passage 42. This makes it easier to discharge the refrigerant to the coil end 10a and the coil end 10b, respectively. In FIG. 2, the branch flow passages 44a and 44b extend obliquely from both sides of the vertical flow passage 42 at any height position of the vertical flow passage 42, each facing in one direction (upward in FIG. 2). The branch flow passages 44c and 44d also extend obliquely at another height position, facing in one direction (upward in FIG. 2).

[0028] 2, for example, the tip of the branch flow path 44 may be closed within the cover 22, or may be open to the outside of the cover 22. The branch flow path 44 may be perpendicular to the vertical flow path 42, or may extend obliquely downward or obliquely upward. The branch flow path 44 may extend linearly and / or curvedly.

[0029] The pattern of the flow path 40 is not particularly limited as long as it has at least one vertical flow path 42. The pattern is set appropriately depending on the part of the motor 2 to be cooled.

[0030] A refrigerant that cools the motor 2 is supplied to the flow path 40 from outside the motor case 20. The refrigerant is supplied to the flow path 40 from a cooling system, such as an e-axle that includes the motor 2 (not shown). The cooling system includes a flow path that circulates the refrigerant to cool the motor 2 and a gear unit (not shown), and a pump that pressure-feeds the refrigerant. In the motor 2 shown in FIGS. 1 to 3, an oil-based cooling medium with lubricating properties is used as the refrigerant. In this specification, the term "refrigerant" refers to a liquid cooling medium, and in addition to oil-based cooling mediums, aqueous cooling mediums can also be used.

[0031] The flow path 40 has a refrigerant inlet 40a through which the refrigerant flows from the cooling system into the flow path 40. As shown in Figures 1 and 2, the refrigerant inlet 40a opens at the lower end of the vertical flow path 42. Note that the openings of the flow path 40 other than the refrigerant inlet 40a are sealed with appropriate plugs.

[0032] The flow path 40 has discharge portions 50 made up of a plurality of holes, as shown in Figures 1 to 3. The pattern of the discharge portions 50 is shown in Figures 2 and 3.

[0033] 2 and 3, holes 51-53 and holes 54-56 are formed as discharge portions 50 at the upper and lower vertical positions of the entire flow path 40. These holes 51-56 all communicate the interiors of branch flow paths 44a, 44b, 44c, and 44d with the interior of the motor case 20. The holes 51 and 53 are open to the branch flow paths 44a and 44b, and the hole 52 is open to the vertical flow path 42. The holes 54 and 56 are open to the branch flow paths 44c and 44d, and the hole 55 is open to the vertical flow path 42.

[0034] As shown in FIGS. 1 to 3, holes 51 to 53 of discharge portion 50 are opened at positions where they can discharge refrigerant toward the inner periphery of coil end 10a. Holes 51 to 53 are located closer to central axis Z than coil end 10a. Holes 54 to 56 are opened at positions where they can discharge refrigerant toward the inner periphery of coil end 10b. Holes 54 to 56 are located closer to central axis Z than coil end 10a. Holes 51 to 53 are an example of a first hole in this specification, and holes 54 to 56 are an example of a second hole in this specification.

[0035] Furthermore, for example, although not particularly limited, holes 51 to 53 have a circular opening shape with the same hole diameter, and holes 54 to 56 have a circular opening shape with the same hole diameter but smaller than holes 51 to 53. The hole diameters of holes 51 to 53 are an example of a first hole diameter in this specification, and the hole diameters of holes 54 to 56 are an example of a second hole diameter in this specification.

[0036] Furthermore, a hole 57 is provided at one location of the vertical flow path 42, and the hole 57 is connected to a part of the bearing 30 attached to the shaft 4. The hole 57 is formed so that the refrigerant can be discharged toward the rolling element holding portion of the bearing 30. This allows the hole 57 to lubricate and cool the rolling elements of the bearing 30 with the refrigerant. The hole 57 has a circular opening shape with a smaller diameter than the holes 54 to 56. The hole 57 is located closer to the center than the holes 51 to 53 and the holes 54 to 56.

[0037] Next, the operation of the motor 2 will be described. With this motor 2, when refrigerant is supplied through the refrigerant inlet 40a of the flow path 40, it is pumped through the flow path 40 from below to above at a predetermined discharge pressure. As a result, the refrigerant is discharged from the holes 54-56, the holes 51-53, and the hole 57. As the refrigerant is discharged from the holes 54-56 toward the inner periphery of the coil end 10b, the refrigerant cools the coil end 10b from the inner periphery. As the refrigerant is discharged from the holes 51-53 toward the inner periphery of the coil end 10a, the refrigerant cools the coil end 10b from the inner periphery.

[0038] Holes 54-56 have smaller diameters than holes 51-53, but because they are closer to refrigerant inlet 40a, they have higher discharge pressures. This allows coil end 10b to be sufficiently cooled. Holes 51-53 have larger diameters than holes 54-56, allowing more refrigerant to be discharged, allowing coil end 10a, which tends to have a higher temperature, to be sufficiently cooled.

[0039] Furthermore, the refrigerant is discharged from the holes 57 toward the rolling element holding portion of the bearing 30. In the motor 2, an oil-based medium is used as the refrigerant, so the lubricating performance of the bearing 30 is maintained or improved and the bearing 30 is cooled.

[0040] In this way, in the motor 2, the refrigerant is discharged in an amount according to the degree of cooling to any part to be cooled, such as the coil ends 10a, 10b. Refrigerant is also discharged to lubricate the bearings 30.

[0041] The flow path 40 has a vertical flow path 42. This allows the refrigerant to circulate vertically upward and downward. Furthermore, because it has the vertical flow path 42, the refrigerant can be freely discharged to any desired cooling target part in the vertical direction, above, in the center, or below. By providing the vertical flow path 42 and the branch flow paths 44, the refrigerant can also be freely discharged to cooling target parts around the vertical flow path 42.

[0042] Furthermore, both the flow passage 40 and the discharge portion 50 are formed within a range of thickness along the axial direction inside the cover 22. This avoids forming cooling flow passages or discharge ducts on the inner surface of the cover 22, and reduces the axial distance (e.g., the distance in the vehicle width direction) between the cover 22 and the coil ends 10a, 10b inside the motor case 20.

[0043] In the first embodiment, the flow path 40 and the discharge portion 50 are formed inside the cover 22, but this is not limited to this. There is also a case where the flow path 40 is formed on the inner surface of the cover 22 so as to be convex toward the motor 2, and the discharge portion 50 is formed including a plurality of holes and pipes through which the refrigerant is discharged into the flow path 40.

[0044] In the first embodiment, the flow path 40 has the refrigerant inlet 40a at the lower end of the vertical flow path 42 so that the refrigerant flows from bottom to top, but the refrigerant inlet 40a may be set at any position in the flow path 40. The flow direction of the refrigerant in the flow path 40 may also be from top to bottom, and is not particularly limited.

[0045] In the first embodiment, the flow path 40 has the pattern shown in FIG. 2 , but is not limited to this. There is no particular limitation as long as it has at least one vertical flow path 42. The pattern of the flow path 40 is set appropriately depending on the part of the motor 2 to be cooled. For example, the pattern of the flow path 40 shown in FIG. 4 can also be adopted. This flow path 40 has a vertical flow path 42 and branch flow paths 44e, 44f, 44g, and 44h. The branch flow paths 44e and 44f extend obliquely from both sides of the vertical flow path 42 at an arbitrary height position above the vertical flow path 42, each facing in one direction (downward in FIG. 4 ). The branch flow paths 44g and 44h extend obliquely from both sides of the vertical flow path 42 at an arbitrary height position below, each facing in another direction (upward in FIG. 4 ).

[0046] The hole pattern of the discharge portion 50 is not particularly limited. The holes are formed in various patterns in the vertical flow path 42 and / or the branch flow path 44 depending on the parts of the motor 2 to be cooled. The holes may be formed so as to be able to discharge the refrigerant not only on the inner circumferential side of the coil ends 10a, 10b but also on the outer circumferential side and tip portions of the coil ends 10a, 10b. For example, as shown in FIGS. 4 and 5, the inner circumferential side of the coil ends 10a, 10b may include multiple holes 60-67 that can discharge the refrigerant, or as shown in FIG. 6, the inner circumferential side of the coil ends 10a, 10b may include multiple holes 70-76 that are oriented toward the outer circumferential surfaces of the coil ends 10a, 10b.

[0047] There are no particular limitations on the opening area, such as the hole diameter, of the discharge portion 50. It is set appropriately taking into consideration the part to be cooled, the discharge pressure of the refrigerant, the degree of cooling, and the like.

[0048] (Second embodiment) In the second embodiment, refrigerant supplied to cover 122 of motor case 120 is discharged toward coil ends 10b via resolver 80. Fig. 7 shows a cross section of a flow path 140 provided in cover 122 arranged on the non-output side of motor 102 and the vicinity of coil ends 10a, 10b, and Fig. 8 shows a cross section taken along line AA in Fig. 7. Elements common to the first embodiment will be given the same reference numerals and their description will be omitted, and differences from the first embodiment will be mainly described.

[0049] The motor 102 includes a motor case 120, a flow path 140, a resolver 80, and a communication flow path 90. The motor 102 includes a shaft 4, a rotor 6, and a stator 8 that are configured similarly to those in the first embodiment. A cover 122 included in the motor case 120 includes a fixing portion 124 for fixing the resolver 80 to the surface of the cover 122 that faces the motor 2. The fixing portion 124 includes a recessed portion 124a. The recessed portion 124a fits and fixes the resolver 80 so that the resolver 80 is operable.

[0050] The flow path 140 has a vertical flow path 142. The vertical flow path 142 has a refrigerant inlet 140a at its upper end. The vertical flow path 142 has a connection part 148 for connecting the communication flow path 90 of the resolver 80. The connection part 148 is formed below the resolver 80. The connection part 148 has a recessed shape that allows the communication flow path 90 of the resolver 80, which will be described later, to be inserted therein while providing a liquid-tight seal. To achieve a liquid-tight seal, a sealing member such as an O-ring (not shown) is arranged between the inner circumferential surface of this connection part 148 and the outer circumferential surface of the communication flow path 90.

[0051] The resolver 80 is fixed to the shaft 4 so as to face the rotor 6 in the axial direction. The outer periphery of the resolver 80 is surrounded by coil ends 10a, 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 about the central axis Z. The protective cover 86 is an annular body that covers the coil ends of the stator 84 and is made of a resin material or the like. The resolver 80 is an example of a rotation angle sensor unit disclosed in this specification.

[0052] As shown in Figures 7 and 8, the protective cover 86 has a communication passage 90 on its lower edge. The communication passage 90 is a cylindrical duct extending along the axial direction. The communication passage 90 is formed at an end 88 that extends radially outward from a portion of the lower edge of the protective cover 86. The communication passage 90 is disposed so as to face the inner circumferential surface of the coil end 10b of the stator 84. The communication passage 90 is provided on the lower edge of the protective cover 86 by integral molding or the like.

[0053] The end of the communication flow passage 90 facing the rotor 6 in the axial direction is closed. The end of the communication flow passage 90 facing the cover 122 is open, and a communication part 92 with the flow passage 140 is formed.

[0054] The discharge section 150 includes a plurality of holes 93, 94, 95 provided in the communication flow passage 90. The holes 93-95 are formed in the circumferential wall of the communication flow passage 90 that faces the inner circumferential surface of the coil end 10b. The holes 93-95 are opened at positions that allow the refrigerant to be discharged from the communication flow passage 90 toward the inner circumferential side of the coil end 10b. The holes 93-95 are located closer to the center than the coil end 10b, and are provided at positions that overlap with the coil end 10b in the axial direction.

[0055] 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 and 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 circumferential surface of the coil end 10b. Because the refrigerant is discharged toward the inner circumferential surface of the coil end 10b, the coil end 10b is effectively cooled. Furthermore, the refrigerant is discharged to the coil end 10b by effectively utilizing the space in which the resolver 80 is disposed. Therefore, even if the resolver 80 is provided, the distance along the axial direction (for example, the distance in the vehicle width direction) between the motor 102 and the cover 122 is reduced.

[0056] In the second embodiment, the communication flow path 90 is provided only at the lowest part of the protective cover 86 of the resolver 80, but this is not limited to this. If necessary, one or more communication flow paths 90 and holes serving as the discharge portion 150 can be provided at any location on the protective cover 86. In this case, it may be necessary to form a branch flow path with respect to the vertical flow path 142.

[0057] In the second embodiment, the holes 93 to 95 are formed so as to face the inner circumferential side of the coil end 10b of the communication flow passage 90, but this is not limited to this. The discharge portion 150 is formed so as to face a portion to be cooled, such as another portion of the coil end 10b, as necessary.

[0058] In the second embodiment, the refrigerant is discharged via the resolver 80, but the second embodiment may include various aspects of the flow path 140 and the discharge portion 50 in the first embodiment. In addition, the second embodiment may also include various modifications of the first embodiment.

[0059] According to the disclosure of this specification, the specification can include the following configurations. [1] A motor, a rotor fixed to a shaft; a stator that is annular with respect to a central axis of the rotor; a motor case that houses the rotor and the stator; Equipped with The motor case has, on a surface facing the stator in the axial direction of the central axis, a refrigerant flow path including at least a first flow path through which refrigerant flows in a vertical direction, and a plurality of discharge ports that discharge the refrigerant from the refrigerant flow path in the axial direction toward the inside of the motor case. [2] The refrigerant flow path includes at least one second flow path branching from the first flow path, The motor according to [1], wherein at least one of the plurality of discharge portions is located in the at least one second flow path. [3] The motor case includes covers on surfaces facing each other in the axial direction, The cover has the refrigerant flow path therein, The motor according to [1] or [2], wherein the plurality of discharge portions are holes in the cover that communicate with the refrigerant flow path. [4] The motor according to any one of [1] to [4], wherein the plurality of discharge portions include holes that discharge the refrigerant toward coil ends of the stator. [5] The motor according to any one of [1] to [5], wherein the plurality of discharge portions include holes that discharge the refrigerant toward an inner circumferential side of a coil end of the stator. [6] The motor according to any one of [1] to [7], wherein the plurality of discharge portions include holes that discharge the refrigerant to a bearing of the shaft for lubricating the bearing. [7] The motor according to any one of [1] to [6], wherein the plurality of discharge portions include a plurality of holes with different diameters. [8] The plurality of holes having different hole diameters include first holes having a first hole diameter and second holes having a second hole diameter different from the first hole diameter; the first hole discharges the refrigerant toward a coil end portion disposed vertically above the stator, The motor according to [7], wherein the second hole discharges the refrigerant toward a coil end portion arranged vertically below the stator. [9] Further, a rotation angle sensor unit having a rotation angle sensor that detects the rotation angle of the rotor and a protective cover attached to the rotation angle sensor, the protective cover is provided with a communication flow path that communicates with the refrigerant flow path, The motor according to any one of [1] to [8], wherein the plurality of holes include a hole provided in the communication flow path that discharges the refrigerant from the communication flow path toward a coil end of the stator.

[10] The motor according to [9], wherein the plurality of holes includes the hole that discharges the refrigerant toward the inner circumferential side of the coil end.

[0060] Although specific examples of the technology disclosed in this specification have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and variations of the specific examples exemplified above. The technical elements described in this specification or in the drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. The technology exemplified in this specification or in the drawings can achieve multiple objectives simultaneously, and achieving one of these objectives itself has technical utility. [Explanation of symbols]

[0061] 2, 102 motor, 4 rotor, 6 stator, 8 stator, 8a stator core, 10 coil, 10a, 10b coil end, 20, 120 motor case, 40, 140 refrigerant flow path, 42, 142 vertical flow path, 44 branch flow path, 50, 150 discharge part, 80 resolver, 90 connecting flow path, 92 communication part, 148 connection part, Z central axis

Claims

1. A motor, a rotor fixed to a shaft; a stator that is annular with respect to a central axis of the rotor; a motor case that accommodates the rotor and the stator; Equipped with The motor case has, on a surface facing the stator in the axial direction of the central axis, a refrigerant flow path including at least a first flow path through which refrigerant flows in a vertical direction, and a plurality of discharge ports that discharge the refrigerant from the refrigerant flow path in the axial direction toward the inside of the motor case.

2. the refrigerant flow path includes at least one second flow path branching from the first flow path, The motor of claim 1 , wherein at least one of the plurality of outlets is located in the at least one second flow path.

3. the motor case includes covers on surfaces facing each other in the axial direction; The cover has the refrigerant flow path therein, The motor according to claim 1 , wherein the plurality of discharge portions are holes in the cover that communicate with the refrigerant flow path.

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

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

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

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

8. the plurality of holes having different diameters include first holes having a first diameter and second holes having a second diameter different from the first diameter; the first hole discharges the refrigerant toward a coil end portion disposed vertically above the stator, The motor according to claim 7 , wherein the second holes discharge the refrigerant toward coil end portions that are arranged vertically below the stator.

9. a rotation angle sensor unit having a rotation angle sensor that detects the rotation angle of the rotor and a protective cover attached to the rotation angle sensor; the protective cover is provided with a communication flow path that communicates with the refrigerant flow path, The motor according to claim 1 , wherein the plurality of holes include a hole provided in the communication flow path that discharges the refrigerant from the communication flow path toward a coil end of the stator.

10. The motor according to claim 9 , wherein the plurality of holes includes the hole that discharges the coolant toward an inner circumferential side of the coil end.

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