Motor

Abstract

To improve the cooling effect of a stator.SOLUTION: A motor includes a stator extending in an axial direction, a rotor located radially inward of the stator and rotating with respect to the stator, a cooling pipe having an annular first cooling portion located radially outward of the stator, and a casing accommodating the stator, the rotor, and the cooling pipe. The stator includes a stator core having a tubular core back portion extending in an axial direction and a plurality of tooth portions extending radially inward from the core back portion and arranged in a circumferential direction, and a stator coil wound around the plurality of tooth portions. An inner circumferential surface of the first cooling portion is located radially outward of a radially outermost position of the core back portion when viewed in the axial direction. The casing includes a molded resin portion that integrally resin-molds the stator core, the stator coil, and the cooling pipe.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a motor. [Background technology]

[0002] A motor is known in which a coolant passage for cooling the stator is formed radially outward of the stator. As such a motor, a rotating electric machine is known which has a double-structure housing including an inner housing that houses a stator and a rotor, and an outer housing that covers the outer periphery of the inner housing, and a main passage for circulating the coolant is formed between the inner housing and the outer housing (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-176820 Summary of the Invention [Problem to be solved by the invention]

[0004] In the rotating electric machine described above, the coolant flow path is formed in a housing that accommodates the stator and rotor. Meanwhile, the stator coil, which is the heat source of the stator, is located radially inward of the stator. Therefore, a configuration in which the coolant flow path is formed in the housing may not provide sufficient cooling. Therefore, a motor configuration that can further improve the cooling effect of the stator has been desired.

[0005] An object of the present invention is to provide a motor with an improved stator cooling effect. [Means for solving the problem]

[0006] A motor according to an exemplary embodiment of the present invention includes a stator extending in the axial direction, a rotor positioned radially inward of the stator and rotating relative to the stator, a cooling pipe positioned radially outward of the stator and having an annular first cooling portion, and a casing that houses the stator, the rotor, and the cooling pipe. The stator includes a stator core having a cylindrical core back portion extending axially and a plurality of teeth extending radially inward from the core back portion and arranged circumferentially, and a stator coil wound around the plurality of teeth. The inner circumferential surface of the first cooling portion is positioned radially outward from the outermost radial position of the core back portion when viewed in the axial direction. The casing includes a molded resin portion that integrally molds the stator core, the stator coil, and the cooling pipe with resin. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a motor with an improved stator cooling effect. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view showing a schematic configuration of a motor according to an embodiment. [Figure 2] FIG. 2 is a perspective view showing a schematic configuration of the cooling pipe and the first cover portion. [Figure 3] FIG. 3 is a plan view of the cooling pipe as viewed in the axial direction. [Figure 4] FIG. 4 is a plan view of the first cover part as viewed in the axial direction. [Figure 5] FIG. 5 is a plan view of the cooling pipe and the first cover part as viewed in the axial direction. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals, and their description will not be repeated. Furthermore, the dimensions of the components in each drawing do not faithfully represent the actual dimensions of the components and the dimensional ratios of the components.

[0010] In the following description, the direction parallel to the central axis P of the motor 1 will be referred to as the axial direction, the direction perpendicular to the central axis P as the radial direction, and the direction along the arc centered on the central axis P as the circumferential direction. In each drawing, the axial direction is indicated by A. Within the axial direction A, the downward direction in FIG. 1 is referred to as one axial direction A1, and the opposite direction is referred to as the other axial direction A2. However, these definitions of directions are not intended to limit the orientation of the motor 1 according to the present invention when in use.

[0011] Furthermore, in the following description, the expressions "fix," "connect," and "attach" (hereinafter referred to as "fixing") include not only cases where members are directly fixed to each other, but also cases where members are fixed via other members. In other words, in the following description, the expression "fixing" includes both direct and indirect fixing of members to each other.

[0012] (Motor configuration) A motor 1 according to an exemplary embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a cross-sectional view showing a schematic configuration of the motor 1. As shown in Fig. 1, the motor 1 has a stator 2, a rotor 3, a cooling pipe 4, a casing 6, and a bearing 7. The motor 1 is a so-called inner rotor type motor in which the rotor 3 is positioned radially inward of the stator 2 and is rotatable about a central axis P.

[0013] The stator 2 extends in an axial direction A along a central axis P. The stator 2 includes a stator core 21 and a stator coil 22.

[0014] The stator core 21 has a core back portion 211 and a plurality of teeth portions 212. The stator core 21 has a one-side end face 21a at an end in one axial direction A1. The stator core 21 has an other-side end face 21b at an end in the other axial direction A2. The stator core 21 has an outer peripheral surface 21c on the radially outer side. The one-side end face 21a is the one-side axial end face of the stator core 21 of the present invention. The other-side end face 21b is the other-side axial end face of the stator core 21 of the present invention.

[0015] The core back portion 211 has a cylindrical shape extending in the axial direction A along the central axis P. The core back portion 211 is located on the outer circumferential side of the stator core 21. The outer circumferential surface of the core back portion 211 forms the outer circumferential surface 21c of the stator core 21.

[0016] The teeth 212 extend radially inward from the core back portion 211. The teeth 212 are aligned in the circumferential direction. The radially inner tips of the teeth 212 face the outer peripheral surface of the rotor 3 in the radial direction.

[0017] Stator coils 22 are wound around the multiple teeth 212. More specifically, the stator coils 22 are formed by winding conductive wires coated with an insulator around the teeth 212. Therefore, the stator coils 22 have portions that run along the circumferential side surfaces of the teeth 212 and portions that protrude in the axial direction A from both sides of the stator core 21 in the axial direction A.

[0018] The portion of the stator coil 22 that protrudes from one axial side A1 of the stator core 21 forms a one-side coil end portion 22a. The portion of the stator coil 22 that protrudes from the other axial side A2 of the stator core 21 forms an other-side coil end portion 22b.

[0019] The wire ends of the conductors forming the stator coil 22 protrude from the other coil end portion 22b in the other axial direction A2. A connection terminal 221 is attached to the tip end, and is connected to an external power source via a bus bar, a circuit board, etc. (not shown).

[0020] When a driving current is supplied to the stator coil 22 via the connection terminal 221, a radial magnetic flux is generated in the teeth portion 212. This generates a circumferential torque in the rotor 3, causing the rotor 3 to rotate about the central axis P.

[0021] A first cooling portion 42 of the cooling pipe 4 is located radially outward of the stator 2. A second cooling portion 43 of the cooling pipe 4 is located on one axial side A1 of the stator 2.

[0022] The rotor 3 is located radially inward of the stator 2. The rotor 3 extends in the axial direction A along the central axis P. The rotor 3 rotates about the central axis P relative to the stator 2. The rotor 3 rotates about the central axis P due to a circumferential torque generated when a drive current is supplied to the stator 2.

[0023] The rotor 3 has a shaft 31. The shaft 31 extends in an axial direction A along a central axis P of the rotor 3. The shaft 31 is fixed to the rotor 3 so as not to be rotatable. Therefore, the shaft 31 rotates together with the rotor 3. The configuration of the rotor 3 is similar to that of a conventional rotor, and therefore a detailed description of the rotor 3 will be omitted.

[0024] (cooling pipe) Fig. 2 is a perspective view showing a schematic configuration of the cooling pipe 4 and the first cover part 62. Fig. 3 is a plan view of the cooling pipe 4 as viewed in the axial direction A. As shown in Fig. 2, the cooling pipe 4 is formed by a pipe 5 having a flow path therein through which a refrigerant flows. In this embodiment, the pipe 5 is made of resin. In this embodiment, the cross-sectional shape of the pipe 5 is circular.

[0025] In this embodiment, the cooling pipe 4 has an inlet section 41, a first cooling section 42, a second cooling section 43, and an outlet section 44. The second cooling section 43 and the outlet section 44 are each formed by a part of the pipe 5 that forms the cooling pipe 4. The pipe 5 that forms the inlet section 41, the pipe 5 that forms the first cooling section 42, the pipe 5 that forms the second cooling section 43, and the pipe 5 that forms the outlet section 44 are connected. Therefore, the flow path in the inlet section 41, the flow path in the first cooling section 42, the flow path in the second cooling section 43, and the flow path in the outlet section 44 are connected.

[0026] The cooling pipe 4 has an inlet 4a which is an inlet for the refrigerant and an outlet 4b which is an outlet for the refrigerant. The refrigerant input from the inlet 4a flows through the flow path in the inlet section 41, the flow path in the first cooling section 42, the flow path in the second cooling section 43, and the flow path in the outlet section 44, in that order, and is output from the outlet 4b. Hereinafter, the flow of the refrigerant through the flow paths in the inlet section 41, the first cooling section 42, the second cooling section 43, and the outlet section 44 will also be simply referred to as the refrigerant flowing through the inlet section 41, the first cooling section 42, the second cooling section 43, and the outlet section 44, respectively.

[0027] 1, the first cooling section 42 is located radially outward of the stator 2. The first cooling section 42 cools the stator 2 from the radially outward side.

[0028] As shown in Fig. 2, the first cooling section 42 has an overall cylindrical shape extending in the axial direction A along the central axis P. That is, the first cooling section 42 is annular and located radially outward of the stator 2. The tubes 5 forming the first cooling section 42 extend spirally around the stator 2. Therefore, the refrigerant flows spirally radially outward of the stator 2.

[0029] The first cooling section 42 has a one-side end portion 42a at an end portion on one axial direction A1. As shown in FIG. 1, the one-side end portion 42a of the first cooling section 42 is located on the one axial direction A1 from the one-side end face 21a of the stator core 21. In other words, the one-side end portion 42a of the first cooling section 42 is located radially outward from the one-side coil end portion 22a. The one-side end portion 42a of the first cooling section 42 can cool the one-side coil end portion 22a from the radially outer side. The one-side end portion 42a is the one axial side end portion of the first cooling section 42 of the present invention.

[0030] The first cooling section 42 has an other-side end portion 42b at its end in the other axial direction A2. The other-side end portion 42b of the first cooling section 42 is located further in the axial direction A2 than the other-side end face 21b of the stator core 21. In other words, the other-side end portion 42b of the first cooling section 42 is located radially outward from the other-side coil end portion 22b. The other-side end portion 42b of the first cooling section 42 can cool the other-side coil end portion 22b from the radially outer side. The other-side end portion 42b is the other axial side end portion of the first cooling section 42 of the present invention.

[0031] The first cooling section 42 and the stator core 21 do not overlap when viewed in the axial direction A. That is, when viewed in the axial direction A, the inner circumferential surface 42c of the first cooling section 42 is located radially outward from the radially outermost position of the core back portion 211. Therefore, for example, when manufacturing the motor 1, after forming the first cooling section 42 into a cylindrical shape, the stator 2 can be inserted radially inward of the first cooling section 42 from the axial direction A. This improves the workability of the work of forming the first cooling section compared to a manufacturing method in which the first cooling section is formed by winding a tube around the outer circumferential surface of the stator.

[0032] 1, the first cooling section 42 is fixed radially outward of the stator 2 by a molded resin section 61. The molded resin section 61 will be described later.

[0033] In the present embodiment, the inlet portion 41 is connected to the other axial direction A2 side of the first cooling section 42. Therefore, in the present embodiment, the refrigerant flows from the other axial direction A2 side to the one axial direction A1 side within the first cooling section 42.

[0034] The second cooling section 43 is located on one axial side A1 with respect to the stator 2. Specifically, the second cooling section 43 is located on one axial side A1 with respect to one end face 21a and one coil end portion 22a of the stator core 21. The second cooling section 43 cools the stator 2 from one axial side A1.

[0035] 2 and 3, the second cooling section 43 is located radially inward with respect to one side end 42a of the first cooling section 42. The pipe 5 forming the second cooling section 43 extends in the circumferential direction at a position radially inward of the radial position of the first cooling section 42.

[0036] As shown in FIG. 1, the second cooling section 43 is fixed to the stator 2 by a molded resin section 61 on one side A1 in the axial direction.

[0037] 2, the flow path in the second cooling section 43 is connected to the flow path in the first cooling section 42. An outflow section 44 is connected to the second cooling section 43. The refrigerant sent from the first cooling section 42 flows in the second cooling section 43. The refrigerant that has flowed in the second cooling section 43 is output from the outflow section 44.

[0038] That is, the refrigerant input into the cooling pipe 4 from the inlet 4a flows spirally radially outward of the stator 2 from the other axial side A2 to the one axial side A1 of the stator 2. Next, the refrigerant flows circumferentially on the one axial side A1 of the one coil end portion 22a. Thereafter, the refrigerant is output from the outlet 4b. The refrigerant flowing in this manner cools the stator 2.

[0039] 1, the inlet portion 41 is connected to the other axial direction A2 side of the first cooling portion 42. The inlet portion 41 extends radially outward from the first cooling portion 42 and is located radially outward from the molded resin portion 61. The inlet portion 41 can be connected to, for example, an external pipe and a pump.

[0040] The outflow portion 44 is connected to the second cooling portion 43. The outflow portion 44 extends radially outward from the second cooling portion 43 and is located radially outward from the molded resin portion 61. The outflow portion 44 can be connected to, for example, an external pipe and a pump.

[0041] As described above, the connection terminals 221 of the stator coil 22 are located on the other axial side A2 relative to the other end portion 42b of the stator core 21. More specifically, the connection terminals 221 of the stator coil 22 are located on the other axial side A2 relative to the other end portion 42b of the first cooling portion 42. In other words, the connection terminals 221 of the stator coil 22 are located on the opposite side to the one axial side A1 on which the second cooling portion 43 is located. This prevents interference between the second cooling portion 43 of the cooling pipe 4 and the connection terminals 221 of the stator 2.

[0042] (Casing) The casing 6 is an exterior body of the motor 1. The stator 2, the rotor 3, and the cooling pipes 4 are housed inside the casing 6. In this embodiment, the casing 6 has a molded resin part 61, a first cover part 62, and a second cover part 63. FIG. 4 is a plan view of the first cover part 62 as viewed in the axial direction A. FIG. 5 is a plan view of the cooling pipes 4 and the first cover part 62 as viewed in the axial direction A.

[0043] 1, the molded resin portion 61 extends in the axial direction A along the central axis P. The molded resin portion 61 covers the radially outer and axial end faces of the stator 2. In this embodiment, the outer peripheral surface of the molded resin portion 61 forms the outer peripheral surface of the motor 1.

[0044] The molded resin part 61 has an opening 61a and an opening 61b on one axial side A1 and the other axial side A2, respectively. The opening 61a of the molded resin part 61 is covered by a first cover part 62. The opening 61b of the molded resin part 61 is covered by a second cover part 63.

[0045] The molded resin portion 61 integrally resin-moldes the stator core 21, the stator coil 22, the cooling pipe 4, and the first cover portion 62. That is, the molded resin portion 61 integrates the stator core 21, the stator coil 22, the cooling pipe 4, and the first cover portion 62 with resin.

[0046] The molded resin portion 61 is located radially between the outer peripheral surface 21c of the stator core 21 and the first cooling portion 42, radially between the one-side coil end portion 22a and the first cooling portion 42, and radially between the other-side coil end portion 22b and the first cooling portion 42. The molded resin portion 61 is also located axially between the one-side coil end portion 22a and the second cooling portion 43, and axially between the second cooling portion 43 and the first cover portion 62. The radially inner tips of the multiple teeth portions 212 are exposed from the molded resin portion 61.

[0047] 1, the first cover part 62 is located on one axial side A1 of the molded resin part 61. The first cover part 62 faces the one axial side A1 of the stator 2, the first cooling part 42, and the second cooling part 43.

[0048] The first cover part 62 is integrated with the stator core 21, the stator coil 22, and the cooling pipe 4 by the molded resin part 61. The molded resin part 61 is located on the other axial direction A2 side of the first cover part 62. The one axial direction A1 side of the first cover part 62 is exposed from the molded resin part 61.

[0049] The first cover portion 62 is made of a material having a higher thermal conductivity than the material that makes up the molded resin portion 61. In this embodiment, the first cover portion 62 is made of aluminum.

[0050] By using aluminum, which has high thermal conductivity, as the material for the first cover portion 62, the heat of the stator 2 can be transferred to the first cover portion 62. Therefore, the cooling effect of the stator 2 can be further improved.

[0051] As described above, the first axial direction A1 side of the first cover part 62 is exposed from the molded resin part 61. This allows heat from the stator 2 to be dissipated to the outside from the first axial direction A1 side of the first cover part 62. This further improves the cooling effect of the stator 2.

[0052] 2, the first cover part 62 has a cover main body part 621, a protrusion part 622, and a bearing accommodating part 623. The first cover part 62 has a through hole 62a at the center when viewed in the axial direction, which penetrates in the axial direction A. As shown in FIG. 1, the shaft 31 of the rotor 3 passes through the through hole 62a.

[0053] 2 and 4, the cover main body 621 is circular when viewed in the axial direction A. As shown in Fig. 5, the diameter of the cover main body 621 is equal to the outer diameter of the first cooling section 42. As shown in Fig. 1, the cover main body 621 is in contact with one side end 42a of the first cooling section 42 in the axial direction A.

[0054] 2, the protrusion 622 protrudes in the other axial direction A2 from the surface on the other axial direction A2 side of the cover main body 621. In this embodiment, the protrusion 622 has an arc shape extending circumferentially around the central axis P when viewed in the axial direction A.

[0055] 1, the protruding portion 622 is located radially between the first cooling portion 42 and the second cooling portion 43. That is, the protruding portion 622 is radially inward from one side end portion 42a of the first cooling portion 42 and extends in the circumferential direction along the first cooling portion 42.

[0056] The protruding portion 622 has a notched portion 622a that is cut out in the circumferential direction and in the axial direction A. The first cooling portion 42 and the second cooling portion 43 are connected in the radial direction at the position of the notched portion 622a.

[0057] As described above, the pipe 5 forming the second cooling section 43 extends in the circumferential direction at a position radially inward from the radial position of the first cooling section 42. That is, the pipe 5 forming the second cooling section 43 has a portion extending in the radial direction. The cutout portion 622a allows the radially extending portion of the second cooling section 43 to pass through.

[0058] That is, the first cover portion 62 has a flat cover main body portion 621 that contacts one side end portion 42a of the first cooling portion 42 in the axial direction A, and a protrusion portion 622 that protrudes from the cover main body portion 621 in the other axial direction A2 and extends circumferentially along the first cooling portion 42, radially inward from the one side end portion 42a of the first cooling portion 42.

[0059] As described above, the protruding portion 622 has the notch 622a. The notch 622a allows the first cover portion 62 to be configured such that the first cooling portion 42 is in contact with the cover main body portion 621 of the first cover portion 62 radially outward of the protruding portion 622, and the second cooling portion 43 can be disposed radially inward of the protruding portion 622.

[0060] Therefore, with the above-described configuration, the protruding portion 622 of the first cover portion 62 can be inserted radially inward of one side end portion 42a of the first cooling portion 42, and the one side end portion 42a of the first cooling portion 42 can be brought into contact with the cover main body portion 621 and the protruding portion 622 of the first cover portion 62. This allows the cooling pipe 4 to be attached to the first cover portion 62.

[0061] With the cooling pipes 4 attached to the first cover part 62, the cooling pipes 4 are positioned in the axial direction A and radial direction relative to the first cover part 62. Therefore, during manufacturing, with the cooling pipes 4 positioned relative to the first cover part 62, the stator core 21, the stator coil 22, the cooling pipes 4, and the first cover part 62 can be resin-molded together.

[0062] 1, tip 622b of protrusion 622 is in contact with the end face of stator core 21 in the axial direction A. More specifically, tip 622b of protrusion 622 is in contact with one side end face 21a of stator core 21.

[0063] As a result, the stator 2 is positioned in the axial direction A relative to the first cover part 62. The cooling pipe 4 is positioned in the axial direction and radial direction in the first cover part 62. Therefore, the first cooling part 42 can be positioned in the axial direction A and radial direction relative to the stator 2 via the first cover part 62.

[0064] Therefore, during manufacturing, the stator core 21, the stator coil 22, the cooling pipe 4, and the first cover portion 62 can be resin-molded together in a state where the cooling pipe 4 is positioned relative to the stator 2. This improves the workability of the resin-molding operation.

[0065] 1, the bearing accommodating portion 623 is located in the center of the cover main body portion 621. The bearing 7 is accommodated in the bearing accommodating portion 623. As described above, the rotor 3 has the shaft 31 extending in the axial direction A and rotating together with the rotor 3. The bearing accommodating portion 623 of the first cover portion 62 accommodates the bearing 7 that rotatably supports the shaft 31.

[0066] In this way, the first cover part 62 also has the function of holding the bearing 7. Therefore, the number of parts constituting the motor 1 can be reduced compared to a motor in which the first cover part and the bearing accommodating part that accommodates the bearing are separate parts.

[0067] 1, the second cover part 63 is located on the other axial side A2 of the molded resin part 61. The second cover part 63 faces the other axial side A2 of the stator 2 and the first cooling part 42. The second cover part 63 is fixed to the other axial side A2 of the molded resin part 61. The second cover part 63 has a bearing accommodating part 631 that accommodates the bearing 7 that rotatably supports the shaft 31.

[0068] The motor 1 according to this embodiment, having the above configuration, is a motor having a stator 2 extending in the axial direction A, a rotor 3 positioned radially inward of the stator 2 and rotating relative to the stator 2, a cooling pipe 4 having an annular first cooling portion 42 positioned radially outward of the stator 2, and a casing 6 accommodating the stator 2, the rotor 3, and the cooling pipe 4. The stator 2 has a cylindrical core back portion 211 extending in the axial direction A, a stator core 21 having a plurality of teeth 212 extending radially inward from the core back portion 211 and arranged circumferentially, and a stator coil 22 wound around the plurality of teeth 212. As viewed in the axial direction A, an inner circumferential surface 42c of the first cooling portion 42 is positioned radially outward from the outermost position of the core back portion 211. The casing 6 has a molded resin portion 61 that resin-moldes the stator core 21, the stator coil 22, and the cooling pipe 4 together.

[0069] In the motor 1 having the above-described configuration, the stator core 21, stator coil 22, and cooling pipe 4 are integrated by the molded resin portion 61. That is, a resin with a higher thermal conductivity than air is located between the stator core 21 and stator coil 22 and the cooling pipe 4. Therefore, more heat from the stator coil 22 can be transferred to the cooling pipe 4 than in a motor in which air is located between the stator core and stator coil and the cooling pipe. This improves the cooling effect of the stator 2.

[0070] Furthermore, in the above-described configuration, the first cooling section 42 and the stator core 21 do not overlap when viewed in the axial direction A. Therefore, for example, when manufacturing the motor 1, after the first cooling section 42 is formed into a cylindrical shape, the stator 2 can be inserted radially inward of the first cooling section 42 from the axial direction A. This improves the workability of forming the first cooling section compared to a manufacturing method in which the first cooling section is formed by wrapping a tube around the outer peripheral surface of the stator.

[0071] In this embodiment, the cooling pipe 4 further includes a second cooling portion 43 located on one side A1 of the stator 2 in the axial direction.

[0072] The second cooling section 43 is located in the axial direction of one side coil end portion 22a of the stator coil 22 that protrudes from one side end surface 21a of the stator core 21. This allows the heat of the stator coil 22 to be cooled from the axial direction A. Therefore, a configuration can be provided that can cool the stator 2 from the radial direction and the axial direction A of the stator 2. Therefore, the cooling effect of the stator 2 can be improved.

[0073] In this embodiment, the casing 6 has a first cover part 62 located on one axial side A1 of the stator 2 and the cooling pipes 4. The cooling pipes 4 are attached to the first cover part 62. The molded resin part 61 resin-moldes the stator core 21, the stator coil 22, the cooling pipes 4, and the first cover part 62 together.

[0074] As a result, when manufacturing the motor 1, the stator core 21, stator coil 22, cooling pipe 4, and first cover part 62 can be integrally resin molded with the cooling pipe 4 attached to the first cover part 62. This makes it possible to realize a motor 1 that can be easily manufactured and has an improved cooling effect for the stator 2.

[0075] In this embodiment, the cooling pipe 4 further has an inlet portion 41 located at an inlet 4a for the refrigerant flowing through the cooling pipe 4, and an outlet portion 44 located at an outlet 4b for the refrigerant. The second cooling portion 43 is connected to the first cooling portion 42 on one axial side A1 of the first cooling portion 42. The inlet portion 41 is connected to the other axial side A2 of the first cooling portion 42, and the outlet portion 44 is connected to the second cooling portion 43.

[0076] In this embodiment, the cooling pipes 4 are not located on the other axial side A2 of the stator 2. That is, the cooling pipes 4 are not located in the axial direction A of the other-side coil end portions 22b of the stator coil 22 that protrude from the other-side end face 21b of the stator core 21. Therefore, the other-side coil end portions 22b that protrude from the other-side end face 21b are not cooled in the axial direction A.

[0077] In contrast, in the above-described configuration, the refrigerant is input from the other axial direction A2 side. That is, in the above-described configuration, the refrigerant that absorbs less heat is located on the other axial direction A2 side. Therefore, the other axial direction A2 side of the stator 2 can be cooled more by the first cooling unit 42 than the one axial direction A1 side.

[0078] In this embodiment, the inlet portion 41 and the outlet portion 44 are located radially outward of the molded resin portion 61 .

[0079] An external pipe and a pump can be connected to the inlet port 41 and the outlet port 44. This allows the refrigerant in the cooling pipe 4 to circulate.

[0080] (Other embodiments) Although the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiments, and it is possible to appropriately modify the above-described embodiments within the scope of the spirit of the present invention.

[0081] In the above embodiment, the cooling pipe 4 has the second cooling section 43. However, the cooling pipe does not have to have the second cooling section. In this case, the inlet and outlet may be connected to the first cooling section.

[0082] In the above embodiment, the cooling pipe 4 has an inlet portion 41 and an outlet portion 44. However, the cooling pipe does not have to have an inlet portion. For example, the first cooling section may have an inlet for the refrigerant. The cooling pipe does not have to have an outlet portion. For example, the second cooling section may have an outlet for the refrigerant.

[0083] In the above embodiment, the inlet portion 41 is connected to the other axial side A2 of the first cooling section 42, and the outlet portion 44 is connected to the second cooling section 43 located on the one axial side A1 of the first cooling section 42. Therefore, the refrigerant flows from the other axial side A2 to the one axial side A1 within the first cooling section 42. However, the outlet portion may be connected to the other axial side of the first cooling section, and the inlet portion may be connected to the second cooling section located on the one axial side of the first cooling section. In other words, the first cooling section may be configured so that the refrigerant flows from the one axial side to the other axial side.

[0084] In the above embodiment, the flow path in the first cooling section 42 and the flow path in the second cooling section 43 are connected. However, the flow path in the first cooling section and the flow path in the second cooling section do not have to be connected. In this case, the inlet and outlet may be connected to the first cooling section, and the inlet and outlet may be connected to the second cooling section.

[0085] In the above embodiment, the inlet portion 41 and the outlet portion 44 are located radially outward from the molded resin portion 61. However, the inlet portion and the outlet portion do not have to be located radially outward from the molded resin portion. For example, the inlet portion and the outlet portion may be located on one axial side of the first cover portion or the other axial side of the second cover portion. The inlet portion and the outlet portion may be located inside the casing.

[0086] In the above embodiment, the first cover portion 62 of the casing 6 is made of aluminum. However, the first cover portion does not have to be made of aluminum. It is preferable that the material of the first cover portion is made of a material having a higher thermal conductivity than the material of the molded resin portion.

[0087] In the above embodiment, the outer peripheral surface of the molded resin portion 61 constitutes the outer peripheral surface of the motor 1. However, the motor may be configured to further include an outer casing that covers the outer side of the molded resin portion in the radial direction.

[0088] In the above embodiment, the molded resin part 61 integrally resin-moldes the stator core 21, the stator coil 22, the cooling pipes 4, and the first cover part 62. That is, the first cover part 62 is integrated with the stator core 21, the stator coil 22, and the cooling pipes 4 by the molded resin part 61. However, the molded resin part may integrally resin-molde the stator core, the stator coil, and the cooling pipes, and the first cover part may be fixed to one axial side of the molded resin part.

[0089] In the embodiment described above, the first cover part 62 has a protrusion 622. The protrusion 622 positions the first cooling part 42 in the radial direction relative to the first cover part 62. However, the first cover part does not have to have a protrusion. That is, the first cover part does not have to have a component for positioning the first cooling part in the radial direction. The first cover part may have another component for positioning the first cooling part in the radial direction.

[0090] In the embodiment, the first cover portion 62 has one arc-shaped protrusion 622 that extends circumferentially around the central axis P when viewed in the axial direction A. However, the first cover portion may have a plurality of protrusions that are arranged circumferentially around the central axis P when viewed in the axial direction A.

[0091] In the above embodiment, the protrusion 622 is located radially between the first cooling section 42 and the second cooling section 43. The first cooling section 42 is positioned radially relative to the first cover section 62 by the protrusion 622. However, the protrusion may be located radially outward of the first cooling section. Even with this configuration, the first cooling section 42 can be positioned radially relative to the first cover section 62.

[0092] In the above embodiment, the first cover part 62 has the bearing accommodating part 623. However, the first cover part does not have to have a bearing accommodating part. The motor may have a structure capable of holding a bearing separate from the first cover part.

[0093] In the above embodiment, the second cover part 63 has the bearing accommodating part 631. However, the second cover part does not have to have a bearing accommodating part. The motor may have a structure capable of holding a bearing separate from the second cover part.

[0094] In the above embodiment, the connection terminals 221 of the stator coil 22 are located on the opposite side of the axial direction A1 where the second cooling unit 43 is located. However, the connection terminals of the stator coil may be located on the axial direction side where the second cooling unit is located.

[0095] In the above embodiment, the tube 5 is made of resin, but the tube may also be made of metal such as aluminum.

[0096] (Configuration example) The present technology can also be configured as follows.

[0097] (1) The motor includes a stator extending in the axial direction, a rotor positioned radially inward of the stator and rotating relative to the stator, a cooling pipe with an annular first cooling portion positioned radially outward of the stator, and a casing accommodating the stator, the rotor, and the cooling pipe. The stator includes a stator core having a cylindrical core back portion extending axially and a plurality of teeth extending radially inward from the core back portion and arranged circumferentially, and a stator coil wound around the plurality of teeth. The inner circumferential surface of the first cooling portion is positioned radially outward from the outermost radial position of the core back portion when viewed in the axial direction. The casing includes a molded resin portion that resin-moldes the stator core, the stator coil, and the cooling pipe together.

[0098] (2) In the motor described in (1), the cooling pipe further includes a second cooling portion located on one axial side of the stator.

[0099] (3) In the motor described in (1) or (2), the casing has a first cover portion located on one axial side of the stator and the cooling pipe. The cooling pipe is attached to the first cover portion. The molded resin portion resin-moldes the stator core, the stator coil, the cooling pipe, and the first cover portion together.

[0100] (4) In the motor described in (3), the rotor has an axially extending shaft that rotates together with the rotor, and the first cover portion has a bearing accommodating portion that accommodates a bearing that rotatably supports the shaft.

[0101] (5) In the motor described in (3) or (4), the first cover portion has a flat cover main body portion that axially contacts one axial end of the first cooling portion, and a protrusion portion that protrudes from the cover main body portion in the other axial direction and extends circumferentially along the first cooling portion, radially inward from the one axial end of the first cooling portion.

[0102] (6) In the motor described in (5), the tip of the protrusion of the first cover part contacts the axial end face of the stator core.

[0103] (7) In the motor described in (5) or (6), the protrusion of the first cover part has a notch cut out in the circumferential direction and the axial direction, and the first cooling part and the second cooling part are connected in the radial direction at the position of the notch.

[0104] (8) In the motor according to any one of (1) to (7), the cooling pipe further has an inlet portion located at an inlet for a refrigerant flowing through the cooling pipe, and an outlet portion located at an outlet for the refrigerant, the inlet portion and the outlet portion being located radially outward from the molded resin portion.

[0105] (9) In the motor described in (2), the cooling pipe further has an inlet portion located at an inlet for the refrigerant flowing through the cooling pipe and an outlet portion located at an outlet for the refrigerant. The second cooling portion is connected to the first cooling portion on one axial side of the first cooling portion. The inlet portion is connected to the other axial side of the first cooling portion, and the outlet portion is connected to the second cooling portion.

[0106] (10) In the motor according to (9), The connection terminal of the stator coil is located on the other axial side of the other axial end of the first cooling portion.

[0107] (11) In the motor described in any one of (3) to (7), the first cover portion is made of a material having a higher thermal conductivity than a material constituting the molded resin portion, and one axial side of the first cover portion is exposed from the molded resin portion.

[0108] (12) In the motor according to any one of (3) to (7) or (11), the first cover portion is made of aluminum. [Industrial Applicability]

[0109] The present invention can be used in a motor having a cooling pipe for cooling a stator. [Explanation of symbols]

[0110] 1 motor 2 stator 3 rotors 4 Cooling pipe 4a Inlet 4b Outlet 5 tubes 6 Casing 7. Bearings 21 Stator core 21a One end face (one end face in the axial direction) 21b Other end face (other axial end face) 21c Outer surface 22 stator coil 22a One side coil end 22b Other side coil end 31 Shaft 41 Inlet 42 1st cooling section 42a One end (one end in the axial direction) 42b Other end (other axial end) 42c Inner surface 43 Second cooling section 44 Outlet 61 Molded resin part 61a, 61b opening 62 First cover part 62a through hole 63 Second cover part 211 Core back part 212 Teeth 221 Connection terminal 621 Cover body 622 Protrusion 623 Bearing housing 622a Notch 622b tip 631 Bearing housing

Claims

1. a stator extending in an axial direction; a rotor positioned radially inward of the stator and rotating relative to the stator; a cooling pipe having an annular first cooling portion located radially outward of the stator; a casing that accommodates the stator, the rotor, and the cooling pipe; A motor having The stator includes: a stator core having a cylindrical core back portion extending in an axial direction and a plurality of teeth portions extending radially inward from the core back portion and arranged in a circumferential direction; a stator coil wound around the plurality of teeth; and an inner circumferential surface of the first cooling portion is located radially outward from a radially outermost position of the core back portion when viewed in the axial direction; the casing has a molded resin portion that resin-moldes the stator core, the stator coil, and the cooling pipe together. Motor.

2. 2. The motor according to claim 1, The cooling pipe further includes a second cooling portion located on one axial side of the stator. Motor.

3. 3. The motor according to claim 1, the casing has a first cover portion located on one axial side of the stator and the cooling pipe, the cooling pipe is attached to the first cover portion, the molded resin portion integrally resin-moldes the stator core, the stator coil, the cooling pipe, and the first cover portion; Motor.

4. 4. The motor according to claim 3, the rotor has an axially extending shaft that rotates with the rotor; The first cover portion has a bearing accommodating portion that accommodates a bearing that rotatably supports the shaft. Motor.

5. 4. The motor according to claim 3, The first cover portion is a flat cover body portion that contacts an axial end portion of the first cooling portion in the axial direction; a protruding portion that protrudes from the cover main body portion in the other axial direction and extends in a circumferential direction along the first cooling portion, radially inward from the one axial side end portion of the first cooling portion; having Motor.

6. 6. The motor according to claim 5, A tip end of the protrusion of the first cover portion is in contact with an axial end surface of the stator core. Motor.

7. 6. The motor according to claim 5, The protruding portion of the first cover portion has a notched portion that is notched in both the circumferential direction and the axial direction, The first cooling section and the second cooling section are connected in the radial direction at the position of the notch portion. Motor.

8. 2. The motor according to claim 1, The cooling pipe is an inlet portion located at an inlet of a refrigerant flowing through the cooling pipe; an outlet portion located at the outlet of the refrigerant; and The inlet portion and the outlet portion are located radially outward of the molded resin portion. Motor.

9. 3. The motor according to claim 2, The cooling pipe is an inlet portion located at an inlet of a refrigerant flowing through the cooling pipe; an outlet portion located at the outlet of the refrigerant; and the second cooling section is connected to the first cooling section on one axial side of the first cooling section, the inlet portion is connected to the other axial side of the first cooling portion, The outflow portion is connected to the second cooling portion. Motor.

10. 10. The motor according to claim 9, the connection terminal of the stator coil is located on the other axial side of the other axial end of the first cooling portion; Motor.

11. 4. The motor according to claim 3, the first cover portion is made of a material having a higher thermal conductivity than a material constituting the molded resin portion, One axial side of the first cover portion is exposed from the molded resin portion. Motor.

12. 12. The motor according to claim 11, The first cover portion is made of aluminum. Motor.

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