Rotor housing device and motor

Abstract

To provide a rotor housing device and a motor that can appropriately exhibit cooling performance and a support function of a stator and can be easily manufactured.SOLUTION: A rotor housing device and a motor include a stator that can be disposed so as to surround a rotor having a shaft rotatable around a rotation axis, extends along the rotation axis, and is disposed along a circumferential direction with respect to the rotation axis, a pair of support members that fix both end portions of the stator in an axial direction of the rotation axis, at least one heat sink that has a plurality of fins on an outer side in a radial direction of the rotation axis and comes into contact with an outer peripheral surface of the stator to cover the outer peripheral surface, and a fixing member that extends in the circumferential direction of the at least one heat sink and fixes the stator and the at least one heat sink from the outer side of the at least one heat sink in the radial direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a rotor accommodating device and a motor. [Background technology]

[0002] Patent Document 1 discloses a motor housing. This motor housing has ridges at predetermined intervals around its outer periphery, with corrugated fins held between the ridges, and each corrugated fin is fixed in contact with the outer periphery of the motor housing. This motor housing is shrink-fitted to a stator. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 6-253496 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, a motor housing must be provided around the stator to secure the corrugated fins to the stator. Conventionally, the motor housing has also been considered necessary as a structure for supporting the stator. However, because it is necessary to manufacture a motor housing with ridges and provide the corrugated fins inside the motor housing, there are concerns about increased manufacturing costs and the number of steps required for manufacturing and installation. Therefore, there is a demand for a rotor housing device and motor that can adequately demonstrate cooling performance and stator support functions, and that can be manufactured inexpensively.

[0005] Therefore, an object of the present invention is to provide a rotor accommodating device and a motor that can adequately exhibit cooling performance and stator support function and that can be easily manufactured. [Means for solving the problem]

[0006] A rotor accommodating device according to one aspect of the present invention is capable of being arranged to surround a rotor having a shaft that can rotate around a rotation axis, and includes a stator that extends along the rotation axis and is arranged circumferentially relative to the rotation axis, a pair of support members that fix both axial ends of the rotation axis of the stator, at least one heat sink that has a plurality of fins radially outside the rotation axis and covers the outer peripheral surface of the stator, and a fixing member that extends circumferentially of the at least one heat sink and fixes the stator and the at least one heat sink from the radial outside of the at least one heat sink.

[0007] This rotor accommodating device does not require a motor housing as a housing, and at least one heat sink with multiple fins covers the outer peripheral surface of the stator. Therefore, even if a motor housing with fins is not provided, the multiple fins can provide adequate cooling performance. Although at least one heat sink covers the outer peripheral surface of the stator, a pair of support members secure both ends of the stator, thereby providing adequate support for the stator even when the stator is not supported by the motor housing. To provide cooling performance to a conventional rotor accommodating device, a process of forming a recess in the motor housing, a process of placing fins in the recess, and a process of fixing the motor housing to the stator were required. Compared to such conventional rotor accommodating devices, this rotor accommodating device requires only the placement of at least one heat sink on the stator, thereby reducing the number of steps required to provide cooling performance. Therefore, this rotor accommodating device can provide adequate cooling performance and stator support functions, and is easily manufactured.

[0008] In the rotor accommodating device according to one embodiment, the at least one heat sink may be in contact with the outer peripheral surface of the stator. In this case, the at least one heat sink is in contact with and covers the outer peripheral surface of the stator, thereby enabling efficient cooling of the stator.

[0009] In one embodiment of the rotor accommodating device, the fixing member may be strip-shaped and may fasten the stator and at least one heat sink together. In this case, the at least one heat sink and the stator are more easily fastened together (fixed) by the fixing member than when the stator and the motor housing are fixed together by shrink fitting. This makes the rotor accommodating device easier to manufacture.

[0010] In a rotor accommodating device according to one embodiment, the at least one heat sink may be a plurality of heat sinks arranged in a circumferential direction. In this case, since the plurality of heat sinks are arranged in a circumferential direction, each heat sink can be manufactured separately. For example, each heat sink can be divided into shapes that are applicable to manufacturing machines that perform precision manufacturing. Therefore, for example, the spacing between the plurality of fins in each heat sink can be reduced, or the axial length of each fin can be increased. Therefore, this rotor accommodating device can improve cooling performance.

[0011] The rotor accommodating device according to one embodiment may further include a covering member that covers an outer periphery of at least one heat sink and forms a flow path between the covering member and the fins. In this case, the flow path formed between the covering member and the fins allows the cooling gas to be efficiently supplied between the fins. Therefore, the rotor accommodating device can improve cooling performance.

[0012] In one embodiment of the rotor accommodating device, the stator and one of the pair of support members form a flow path through which gas drawn from the outside toward the rotation axis can flow. The fins are arranged in a circumferential direction and extend along the axial direction. The stator may extend in the axial direction and have a region exposed to the flow path. In this case, the stator has a region exposed to the flow path, and the axial ends of the fins of a heat sink provided on the outer peripheral surface of the stator are located in that region. This allows the gas drawn into the flow path to reach the ends of the fins arranged in the circumferential direction via that region and pass between the fins. This allows the rotor accommodating device to exhibit appropriate cooling performance.

[0013] In one embodiment of the rotor accommodating device, at least one heat sink may be provided in the axial center of the stator, and the pair of support members may have outer peripheral surfaces of both ends of the stator, both end faces facing the axial direction of the rotation axis, and portions facing both axial ends of the at least one heat sink. In this case, the pair of support members can support the stator so as to suppress oscillation of the stator in the radial and axial directions of the rotation axis. Therefore, the stator can be appropriately supported without special processing of the stator. Furthermore, because the pair of support members are disposed on both sides of the at least one heat sink, the stator can be appropriately supported as described above even if the entire stator is not supported by a fixed member such as a motor housing.

[0014] A motor according to one embodiment may include a rotor containing device and a rotor disposed inside a stator. This motor can achieve the same effects as the rotor containing device described above. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a rotor accommodating device and a motor that can appropriately exhibit cooling performance and a stator support function and that can be easily manufactured. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view showing a motor including a rotor accommodating device according to an embodiment; [Figure 2] 2 is a perspective cross-sectional view showing a motor equipped with the rotor accommodating device shown in FIG. 1. [Figure 3] 2 is a cross-sectional view showing a part of the rotor accommodating device shown in FIG. 1. [Figure 4] 2 is a conceptual diagram showing the relationship between a motor equipped with the rotor accommodating device shown in FIG. 1 and the flow of gas. [Figure 5] 1 is a conceptual diagram illustrating a relationship between a motor including a rotor accommodating device according to an embodiment and a gas flow. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that identical or corresponding parts in each drawing are denoted by the same reference numerals, and redundant description will be omitted. In the following description, the X-axis, Y-axis, and Z-axis directions are mutually orthogonal axes in a Cartesian coordinate system in three-dimensional space. The X-axis and Y-axis directions are, for example, horizontal directions. For example, the X-axis direction is a horizontal direction, and the Y-axis direction is a horizontal direction intersecting the X-axis direction. In this embodiment, the positive direction of the X-axis direction is referred to as "rightward," the negative direction of the X-axis direction is referred to as "leftward," and the X-axis direction is referred to as the "left-right direction." In this embodiment, the positive direction of the Y-axis direction is referred to as "forward," the negative direction of the Y-axis direction is referred to as "rearward," and the Y-axis direction is referred to as the "front-to-back direction." The left-to-right direction is an example of a direction intersecting the front-to-back direction. The Z-axis direction is, for example, the up-down direction (vertical direction). In this embodiment, the positive direction of the Z-axis direction is referred to as "upward," and the negative direction of the Z-axis direction is referred to as "downward."

[0018] Fig. 1 is a perspective view showing a motor equipped with a rotor accommodating device according to one embodiment. In Fig. 1, motor 1 of this embodiment has a function of circulating gas introduced through duct 75 therein. Motor 1 may be a unit equipped with an inverter (not shown) that controls motor 1.

[0019] The motor 1 is, for example, a three-phase AC motor. The motor 1 may be a motor used in an industrial vehicle. The motor 1 may be, for example, a traction motor for an industrial vehicle. FIG. 2 is a perspective cross-sectional view showing a motor equipped with the rotor accommodating device shown in FIG. 1. FIG. 2 shows a cross section of the motor 1 taken along a plane passing through a rotation axis L of a shaft 11, which will be described later. As shown in FIG. 2, the motor 1 is equipped with a rotor 10, which is a rotor, and a rotor accommodating device 2 having a stator 20, which is a stator. The rotor 10 is disposed inside the rotor accommodating device 2. The rotor 10 may be a rotor used in a conventional motor.

[0020] The stator 20 generates a rotating magnetic field around the rotor 10. This rotating magnetic field generates torque in the rotor 10. As a result, the rotor 10 rotates around the rotation axis L. In the following description, the axial direction (the Y direction in FIG. 2) refers to the direction extending along the rotation axis L, and the circumferential direction R refers to the direction along the circumference of a circle centered on the rotation axis L. The radial direction D refers to the direction perpendicular to the rotation axis L.

[0021] The rotor 10 has, for example, a shaft 11 to which an impeller (not shown) of a fuel pump is connected, a plurality of magnets 12 arranged to surround the shaft 11, a pair of end rings 13 that axially sandwich the magnets 12, and an armor ring 14 arranged to surround the plurality of magnets 12. The shaft 11 has a cylindrical shape with a rotation axis L as its central axis, and is arranged to be rotatable about the rotation axis L.

[0022] The multiple magnets 12 extend along the rotation axis L and are arranged side by side in the circumferential direction R around the rotation axis L. The multiple magnets 12 are arranged side by side in the circumferential direction R around the rotation axis L at regular intervals and at a regular angle.

[0023] Each of the pair of end rings 13 is an annular member with the rotation axis L as its central axis. Each of the pair of end rings 13 has, for example, a circular ring shape. The pair of end rings 13 are arranged so as to cover both end faces of the multiple magnets 12 in the axial direction (Y direction) of the rotation axis L. The pair of end rings 13 cover the outer peripheral surface of the shaft 11.

[0024] The armor ring 14 has the rotation axis L as its central axis and extends along the rotation axis L. The armor ring 14 has, for example, a cylindrical shape. The armor ring 14 houses a plurality of magnets 12 and a pair of end rings 13. The armor ring 14 and the pair of end rings 13 are bonded together, for example, with an adhesive. The armor ring 14 and the pair of end rings 13 do not have to be bonded together, for example. The shaft 11, the plurality of magnets 12, the pair of end rings 13, and the armor ring 14 rotate together around the rotation axis L.

[0025] The rotor accommodating device 2 includes a stator 20, at least one heat sink 30, and a pair of support members 40. The rotor accommodating device 2 of this embodiment includes a covering member 50, a fixing member 60, and a cooling unit .

[0026] The stator 20 can be arranged to surround (cover) the rotor 10, extends along the rotation axis L, and is arranged in a circumferential direction R with respect to the rotation axis L. The stator 20 includes a cylindrical core 21 arranged around the rotor 10, and a coil 25 formed by winding a conductor around teeth provided on the core 21. The rotor accommodating device 2 is required to include at least the core 21 of the stator 20. When an alternating current is supplied to the coil 25 via the conductor, the stator 20 generates a rotating magnetic field around the rotor 10.

[0027] The coil 25 covers the armour 14 of the rotor 10. The coil 25 has an inner circumferential portion 25a which is a portion on the inside in the radial direction D (towards the rotation axis L) and an outer circumferential portion 25b which is a portion on the outside in the radial direction D. In the radial direction D, the inner circumferential portion 25a faces the outer circumferential surface of the armour 14. In the radial direction D, the inner circumferential portion 25a is spaced apart from the armour 14. In the axial direction (Y direction), the central portion of the outer circumferential portion 25b may be recessed inward in the radial direction D compared to both end portions of the outer circumferential portion 25b.

[0028] The core 21 is provided on the radially outer side (opposite the inner side) of the coil 25. The core 21 may be provided in the axial center of the outer circumferential portion 25b of the coil 25. The core 21 is, for example, open in the axial direction and extends in the axial direction. The core 21 has, for example, a cylindrical shape. The core 21 has an inner circumferential surface 21a on the inner side in the radial direction D (toward the rotation axis L), an outer circumferential surface 21b on the outer side in the radial direction D, an end face 21c facing the negative side of the Y axis, and an end face 21d facing the positive side of the Y axis. The inner circumferential surface 21a is a surface facing the outer circumferential portion 25b of the coil 25. The core 21 has, along the axial direction, a central portion 23a and end portions 23b and 23c. The end portion 23b is located on the negative side of the Y axis, and the end portion 23c is located on the positive side of the Y axis. In the axial direction, the end portion 23b and the end portion 23c are positioned with the central portion 23a interposed therebetween.

[0029] At least one heat sink 30 has a plurality of fins 32 on the outside in the radial direction D of the rotation axis L. At least one heat sink 30 covers the outer peripheral surface 21b of the stator 20. At least one heat sink 30 is in contact with the outer peripheral surface 21b of the stator 20. The rotor accommodating device 2 of this embodiment includes a plurality of heat sinks 30 as the at least one heat sink 30. The plurality of heat sinks 30 are arranged side by side in the circumferential direction R. In this embodiment, the heat sink 30 is divided into four parts and arranged adjacent to each other. Each heat sink 30 cools the stator 20. The material of each heat sink 30 is, for example, aluminum.

[0030] Fig. 3 is a cross-sectional view showing a portion of the rotor accommodating device shown in Fig. 1. Fig. 3 shows a cross section of the rotor accommodating device 2 taken along a plane perpendicular to the rotation axis L. As shown in Figs. 2 and 3, each heat sink 30 is provided in the axial center portion 23a of the stator 20. Each heat sink 30 has a substrate portion 31 and a plurality of fins 32.

[0031] The substrate portion 31 extends circumferentially along the outer periphery of the core 21 of the stator 20 and also extends axially. The substrate portion 31 is provided, for example, on the outer periphery 21b of the central portion 23a of the core 21 in the axial direction. That is, the stator 20 has a region 22 that is not covered by the substrate portion 31 and is exposed radially outward. The substrate portion 31 has an inner periphery 31a on the inside in the radial direction D (toward the rotation axis L). The inner periphery 31a faces the outer periphery 21b of the core 21. The substrate portion 31 is fixed so that the inner periphery 31a and the outer periphery 21b of the core 21 of the stator 20 are in contact with each other. That is, the inner periphery 31a of the substrate portion 31 and the outer periphery 21b of the core 21 form mounting surfaces that face each other for the substrate portion 31 of each heat sink 30 and the core 21 of the stator 20.

[0032] The outer dimensions of inner circumferential surface 31a of substrate portion 31 are equal to the outer dimensions of the center of outer circumferential surface 21b of core 21 of stator 20. Note that "equal" here is a concept that includes not only completely equal but also substantially equal. The inner layer of substrate portion 31, including inner circumferential surface 31a, may be composed of a heat transfer sheet, sealing rubber, liquid sealing agent, or the like. Substrate portion 31 may be fixed to outer circumferential surface 21b of core 21 with an adhesive or the like. Substrate portion 31 may be fixed to core 21 with a plurality of bolts. Substrate portion 31 has an end portion 35 on the negative side of the Y-axis and an end portion 36 on the positive side of the Y-axis.

[0033] Each fin 32 is provided on the outer side of the substrate portion 31 in the radial direction D. Each fin 32 protrudes outward from the substrate portion 31 in the radial direction D. The multiple fins 32 are arranged side by side in the circumferential direction R and extend along the axial direction. A recess (part of a second flow path 73 described below) is formed between the outer circumferential surface of the substrate portion 31 and two of the fins 32. The outer circumferential portion 33 of each fin 32 is the tip of each fin 32. The outer circumferential portion 33 is provided, for example, at a position where the length in the radial direction D from the rotation axis L to the outer circumferential portion 33 is the same.

[0034] By having the rotor accommodating device 2 include multiple heat sinks 30, the heat sinks can be provided in a state where they are divided into multiple pieces in the circumferential direction R with respect to the stator 20. Compared to manufacturing an annular heat sink that is continuous in the circumferential direction R, manufacturing each heat sink 30 with a short length in the circumferential direction R is easier. Furthermore, when manufacturing multiple heat sinks 30 divided into multiple pieces in the circumferential direction R, each heat sink 30 can be easily formed by extrusion molding. This allows the pitch of the multiple fins 32 to be narrower and the height of the multiple fins 32 to be greater than when each heat sink 30 is formed by die casting. As a result, the heat dissipation performance of each heat sink 30 can be improved.

[0035] Referring again to FIG. 2, the pair of support members 40 support both axial ends (ends 23b, 23c) of the stator 20. The support members 40 are, for example, end covers. In this embodiment, the pair of support members 40 support only both axial ends (ends 23b, 23c) of the stator 20. The pair of support members 40 do not abut each other but are spaced apart in the axial direction of the stator 20. This means that the pair of support members 40 do not support the axial central portion 23a of the stator 20. On the outer peripheral surface 21b of the core 21 of the stator 20, one of the pair of support members 40, multiple heat sinks 30, and the other of the pair of support members 40 are arranged in this order in the axial direction. The pair of support members 40 do not directly support the multiple heat sinks 30. By fixing the stator 20, the pair of support members 40 indirectly support the multiple heat sinks 30 fixed to the stator 20.

[0036] The pair of support members 40 have portions facing the outer peripheral surfaces 21b at both ends of the stator 20, the axial end faces 21c, 21d of the stator 20, and both axial ends (ends 35, 36) of at least one heat sink 30. The pair of support members 40 of this embodiment have portions facing both axial ends (ends 35, 36) of multiple heat sinks 30. The pair of support members 40 do not constitute all or part of the housing (motor housing). Note that the rotor accommodating device 2 may have a support portion composed of multiple members instead of each of the pair of support members 40. Each of the pair of support members 40 is, for example, an annular member extending in the circumferential direction R. The pair of support members 40 support the stator 20 so as to suppress vibrations of the stator 20 in the axial and radial directions.

[0037] The pair of support members 40 has a first support portion 41 located in the negative direction of the Y axis and a second support portion 42 located in the positive direction of the Y axis. As portions facing both end faces 21c, 21d of stator 20 in the axial direction, first support portion 41 has a first inner extending portion 43, and second support portion 42 has a second inner extending portion 45. The first inner extending portion 43 and the second inner extending portion 45 are in contact with or close to stator 20 in the axial direction.

[0038] The first inner extending portion 43 and the second inner extending portion 45 are positioned to sandwich the stator 20 in the axial direction. The first inner extending portion 43 faces an end face 21c of the core 21 of the stator 20, which faces in the negative direction of the Y axis. The first inner extending portion 43 has a first inner facing surface 43a facing the end face 21c. The second inner extending portion 45 faces an end face 21d of the core 21 of the stator 20, which faces in the positive direction of the Y axis. The second inner extending portion 45 has a second inner facing surface 45a facing the end face 21d.

[0039] The first support portion 41 has a first outer extension portion 44, and the second support portion has a second outer extension portion 46, as portions facing both ends 23b, 23c of the outer peripheral surface 21b of the core 21 of the stator 20 facing radially outward and facing both axial ends 35, 36 of at least one heat sink 30. The first outer extension portion 44 and the second outer extension portion 46 are in contact with or close to the stator 20. The first outer extension portion 44 is spaced apart from the multiple heat sinks 30 in the axial direction. The second outer extension portion 46 may be spaced apart from or in contact with the multiple heat sinks 30 in the axial direction. The first outer extension portion 44 and the second outer extension portion 46 do not cover the central portion 23a of the stator 20 in the axial direction.

[0040] The first outer extension portion 44 faces the outer peripheral surface 21b of the end portion 23b of the core 21 of the stator 20 on the negative side of the Y axis, and the end portions 35 of the multiple heat sinks 30 on the negative side of the Y axis. The first outer extension portion 44 has a first outer facing surface 44a facing the outer peripheral surface 21b of the end portion 23b. The first outer extension portion 44 has a first heat sink facing surface 44b facing the end portions 35 of the multiple heat sinks 30 on the negative side of the Y axis. The second outer extension portion 46 faces the outer peripheral surface 21b of the end portion 23c of the core 21 of the stator 20 on the positive side of the Y axis, and the end portions 36 of the multiple heat sinks 30 on the negative side of the Y axis. The second outer extension portion 46 has a second outer facing surface 46a facing the outer peripheral surface 21b of the end portion 23c. The second outer extension portion 46 has a second heat sink facing surface 46b that faces the ends 36 of the heat sinks 30 in the positive direction of the Y axis.

[0041] 2 and 3, the covering member 50 covers the outer periphery 33 of at least one heat sink 30 and forms a second flow path 73 between the covering member 50 and the fins 32. The covering member 50 may also have the function of covering and protecting the outer peripheries 33 of the heat sinks 30. The covering member 50 is, for example, a thin plate-like member. The covering member 50 is, for example, a cover made of a metal plate such as a steel plate that can be bent and deformed, and can be formed into a cylindrical shape by bending.

[0042] The covering member 50 is provided radially outside the plurality of heat sinks 30. The covering member 50 covers at least a portion of the plurality of heat sinks 30 in the axial direction. The covering member 50 is provided so as not to cover the region 22 of the stator 20 in the axial direction. The covering member 50 is, for example, open in the axial direction and extends in the axial direction and the circumferential direction R. The covering member 50 has an opening 51 that penetrates in the radial direction at an end portion in the positive direction of the Y axis. The opening 51 may be open toward the positive direction of the Y axis.

[0043] The covering member 50 has an inner circumferential surface 50a on the inside in the radial direction D (toward the rotation axis L) and an outer circumferential surface 50b on the outside in the radial direction D. The inner circumferential surface 50a faces the outer circumferential portions 33 of the heat sinks 30. The inner circumferential surface 50a is in contact with or close to the outer circumferential portions 33 of the heat sinks 30. The covering member 50 is fixed together with at least one heat sink 30 by a fixing member 60. The fixing member 60 presses at least a portion of the covering member 50 against the outer circumferential portions 33 of the heat sinks 30 and brings the covering member 50 into contact with the outer circumferential portions 33. A region of the outer circumferential surface 50b where the fixing member 60 is not provided may be exposed to the outside. The covering member 50 may be bent in advance and then wrapped around the outer circumferential portion 33 of at least one heat sink 30. The covering member 50 may be an unbent flat plate that is then wrapped around the outer circumferential portion 33 of at least one heat sink 30. The covering member 50 is wrapped around the outer periphery 33 of at least one heat sink 30 by being tightened with a fixing member 60 described below.

[0044] The fixing member 60 extends in the circumferential direction of the at least one heat sink 30 and fixes the stator 20 and the at least one heat sink 30 from the radially outer side of the at least one heat sink. The fixing member 60 extends over a portion of the outer circumferential portion 33 and fixes the stator 20 and the at least one heat sink 30. Specifically, the fixing member 60 has a strip shape. The fixing member 60 bundles the stator 20 and the at least one heat sink 30. The fixing member 60 is, for example, a bundling member. The fixing member 60 is wound in the circumferential direction R so as to cover a portion of the outer circumferential portion 33 of the at least one heat sink 30. The fixing member 60 of this embodiment may also be wound in the circumferential direction so as to cover a portion of the covering member 50 provided on the at least one heat sink 30. In other words, the fixing member 60 bundles the stator 20, the at least one heat sink 30, and the covering member 50. "Wound in the circumferential direction R so as to cover a portion of the outer circumferential portion 33 of at least one heat sink 30" includes a state in which the fixing member 60 is not in direct contact with at least one heat sink 30, and also includes a state in which a member such as the covering member 50 is interposed between at least one heat sink 30 and the fixing member 60.

[0045] The fixing member 60 may be, for example, a metal hose clamp or a plate clip. In this case, with the covering member 50 wrapped around the stator 20 and the at least one heat sink 30, the stator 20, the at least one heat sink 30, and the covering member 50 may be fixed by tightening the hose clamp or fastening with a plate clip. Note that the fixing member 60 is not limited to a metal member. The fixing member 60 may be formed of, for example, rubber. The fixing member 60 is provided on the outer peripheral surface 50b of the covering member 50, and by contracting toward the inside in the radial direction D (toward the rotation axis L), the fixing member 60 fastens the components (the stator 20, the at least one heat sink 30, and the covering member 50) located inside the radial direction D of the fixing member 60. When the fixing member 60 is a band-shaped rubber, an operator (operating in the manufacturing apparatus for the rotor accommodating device) may wrap the stretched fixing member 60 around the covering member 50 from the radially outer side of the covering member 50, and fix (bind) both ends of the fixing member 60 (rubber) by gluing or bonding. When the fixing member 60 is annular rubber, the stator 20 and at least one heat sink 30, around which the covering member 50 is wrapped, may be passed through the radially inner side of the stretched fixing member 60 (rubber), and then fixed (bind) by shrinking the fixing member 60 (rubber). The fixing member 60 may be, for example, a plate-shaped, band-shaped, or annular member made of synthetic resin.

[0046] The fixing member 60 is provided radially outside the covering member 50. In the axial direction, the fixing member 60 covers at least a portion of the covering member 50. The fixing member 60 is provided so as not to cover the region 22 of the stator 20 in the axial direction. The fixing member 60 is, for example, open in the axial direction and extends in the axial direction and the circumferential direction R.

[0047] The fixing member 60 has an inner peripheral surface 60a on the inside in the radial direction D (toward the rotation axis L) and an outer peripheral surface 60b on the outside in the radial direction D. The inner peripheral surface 60a faces the outer peripheral surface 50b of the covering member 50. The inner peripheral surface 60a is in contact with the outer peripheral surface 50b of the covering member 50. The fixing member 60 is bound so that the inner peripheral surface 60a and the outer peripheral surface 50b of the covering member 50 are in contact with each other. In other words, the inner peripheral surface 60a of the fixing member 60 and the outer peripheral surface 50b of the covering member 50 constitute mounting surfaces of the fixing member 60 and the covering member 50 that face each other. The outer peripheral surface 60b may be exposed to the outside.

[0048] FIG. 4 is a conceptual diagram showing the relationship between a motor including the rotor accommodating device shown in FIG. 1 and the flow of gas. The cooling unit 70 shown in FIGS. 1 and 4 guides gas supplied through a duct 75 (see FIG. 1) toward the rotation axis L and forms a flow path through which the gas flows, as described below. The gas may be air supplied from a blower, fan, compressor, or the like, or a refrigerant supplied from a cooling source (not shown). The cooling unit 70 is attached to the outside of the region 22 of the stator 20 in the radial direction D. The cooling unit 70 may be attached to, for example, the first support portions 41 of the pair of support members 40 and the outer circumferential portion 33 of at least one heat sink 30. The cooling unit 70 may be attached to, for example, the first support portions 41 of the pair of support members 40 and the covering member 50.

[0049] Here, the flow paths through which the gas flows will be described. As shown in FIGS. 2 and 4, the internal space of the cooling section 70 is connected to a first flow path 72, a plurality of second flow paths 73, and a third flow path 74. The stator 20 and the first support portion 41 form the first flow path 72 through which gas taken in from the outside toward the rotation axis L can flow. The first flow path 72 is a space surrounded by the outer circumferential surface 21b (region 22) of the core 21 of the stator 20, the end portions 35 of the plurality of heat sinks 30 (see FIG. 2), and the first outer extending portions 44 of the first support portions 41 of the pair of support members 40. The first flow path 72 is a space extending in the circumferential direction R. The region 22 is a region exposed to the first flow path 72.

[0050] Each heat sink 30 and the covering member 50 form a second flow path 73 through which the gas taken in the first flow path 72 can flow. Each second flow path 73 is a space surrounded by the substrate portion 31 of the multiple heat sinks 30, the two fins 32, and the covering member 50. Each second flow path 73 is a space extending in the axial direction. The multiple second flow paths 73 are arranged side by side in the circumferential direction. The multiple second flow paths 73 are continuous with the first flow path 72 and the third flow path 74.

[0051] The stator 20, each heat sink 30, and the second support portion 42 form a second flow path 73 through which the gas taken in the first flow path 72 can flow. The third flow path 74 is a space surrounded by the outer peripheral surface 21b of the core 21 of the stator 20, the end portions 36 of the multiple heat sinks 30 (see FIG. 2), and the second outer extending portions 46 of the second support portions 42 of the pair of support members 40. The third flow path 74 may be a space surrounded by the multiple fins 32 (end portions 36) of each heat sink 30 and the second outer extending portions 46 of the second support portions 42 of the pair of support members 40. The third flow path 74 is a space extending in the circumferential direction R. The third flow path 74 is open to the outside through an opening 51 of the covering member 50.

[0052] Next, the cooling function of the rotor 10 and the stator 20 by each heat sink 30 will be described with reference to Figures 4 and 5. Figure 5 is a conceptual diagram showing the relationship between a motor including a rotor accommodating device according to one embodiment and the flow of gas. As shown in Figures 4 and 5, gas introduced from duct 75 (see Figure 1) is introduced inward in radial direction D via cooling unit 70 along arrow FA pointing inward in radial direction D, and reaches first flow path 72.

[0053] 5, the gas that reaches the first flow passages 72 flows along the arrows FB that point in the circumferential direction R. Because the second flow passages 73 provided in each heat sink 30 open toward the first support portion 41, the gas that reaches the first flow passages 72 may flow to the respective second flow passages 73 of each heat sink 30. The gas that flows from the first flow passages 72 to the respective second flow passages 73 flows in the direction of the arrows FC that point in the positive direction of the Y axis, and reaches the third flow passages 74.

[0054] Here, heat generated by the rotation of the rotor 10, etc., is transferred to the stator 20, which has a lower temperature than the rotor 10. The heat from the stator 20 is transferred to the multiple heat sinks 30, which have a lower temperature than the stator 20. As a result, the heat from the rotor 10 is transferred to the multiple fins 32 provided on the substrate portion 31 of each heat sink 30. By providing the multiple fins 32 that protrude radially outward on the substrate portion 31, the number of regions to which heat is transferred can be increased, and the surface area of ​​the regions can be widened. By forming the second flow paths 73 between the multiple fins 32, the heat held by the multiple fins 32 can be transferred to the gas flowing through the second flow paths 73.

[0055] The gas that has been heat-transferred in the second flow path 73 and that has reached the third flow path 74 is discharged to the outside through the opening 51 of the covering member 50 along the arrow FD that points outward in the radial direction D.

[0056] Next, we will explain the effects of the motor 1 and rotor accommodating device 2 of this embodiment while explaining the problems with conventional motors. Conventionally, providing multiple fins has been considered for cooling motors. Some motors have motor housings with multiple fins integrated into them. For example, multiple fins may be provided directly on the stator by die casting or other methods. Motor housings with multiple fins integrated into them may have large spacing between the fins due to manufacturing constraints such as die casting, resulting in a small number of fins and poor cooling performance. Furthermore, this manufacturing method may only be applicable to large motors.

[0057] To secure the fins manufactured by extrusion molding, it has been considered to provide a motor housing on the outer periphery of the stator. However, this requires manufacturing a motor housing with irregularities and providing fins inside the motor housing, which can increase manufacturing costs and the number of steps required for manufacturing and installation. While it is possible to omit the motor housing, the motor housing has traditionally been considered a necessary component for supporting the stator. Therefore, there is a need for a rotor accommodating device and motor that can adequately provide cooling performance and stator support functions and can be manufactured inexpensively.

[0058] Here, in the motor 1 and rotor accommodating device 2 of this embodiment, a motor housing as a case is not provided, and at least one heat sink 30 having a plurality of fins 32 contacts and covers the outer peripheral surface 21b of the stator 20. Therefore, even if a motor housing with fins 32 is not provided, the plurality of fins 32 can provide adequate cooling performance. Furthermore, although at least one heat sink 30 is provided in contact with the outer peripheral surface 21b of the stator 20, a pair of support members 40 secure both ends 23b, 23c of the stator 20, thereby enabling the stator 20 to be adequately supported even when the stator 20 is not supported by the motor housing. Here, in order to provide cooling performance to a conventional rotor accommodating device, a process of forming a recess (hollow portion) in the motor housing, a process of arranging fins 32 in the recess, and a process of securing the motor housing to the stator 20 were required. Compared to such conventional rotor accommodating devices, this rotor accommodating device 2 can be completed by arranging at least one heat sink 30 for the stator 20, thereby reducing the number of steps required to provide cooling performance. Furthermore, compared to when the stator and motor housing are fixed by shrink fitting, the at least one heat sink 30 and the stator 20 can be easily fixed by the fixing member 60. Therefore, this motor 1 and rotor accommodating device 2 can appropriately exhibit cooling performance and a function of supporting the stator 20, and can be easily manufactured.

[0059] Furthermore, in the motor 1 and the rotor accommodating device 2, at least one heat sink 30 may be in contact with the outer peripheral surface 21b of the stator 20. In this case, since at least one heat sink 30 is in contact with and covers the outer peripheral surface 21b of the stator 20, the stator can be cooled efficiently.

[0060] Furthermore, in the motor 1 and the rotor accommodating device 2, the fixing member 60 may be strip-shaped and may fasten the stator 20 to at least one heat sink 30. In this case, the at least one heat sink 30 and the stator 20 are more easily fastened (fixed) to each other by the fixing member 60 than when the stator and the motor housing are fixed by shrink fitting. Therefore, this rotor accommodating device can be easily manufactured.

[0061] Furthermore, in the motor 1 and the rotor accommodating device 2, the at least one heat sink 30 may be a plurality of heat sinks 30 arranged in the circumferential direction R. In this case, since the plurality of heat sinks 30 are arranged in the circumferential direction R, each heat sink 30 can be manufactured in a divided form. For example, each heat sink 30 can be divided into shapes that are applicable to manufacturing machines that perform precision manufacturing. Therefore, for example, the spacing between the plurality of fins 32 in each heat sink 30 can be reduced, or the axial length of each fin 32 can be increased. Therefore, the motor 1 and the rotor accommodating device 2 can improve cooling performance.

[0062] The motor 1 and the rotor accommodating device 2 may further include a covering member 50 that covers the outer periphery 33 of at least one heat sink 30 and forms second flow paths 73 between the covering member 50 and the fins 32. In this case, first flow paths 72 are formed between the covering member 50 and the fins 32, and thus the cooling gas is efficiently supplied between the fins 32 (second flow paths 73). Therefore, the motor 1 and the rotor accommodating device 2 can improve cooling performance.

[0063] Furthermore, in the motor 1 and the rotor accommodating device 2, the stator 20 and one of the pair of support members 40 form a first flow passage 72 through which gas taken in from the outside toward the rotation axis L can flow. The multiple fins 32 are arranged side by side in the circumferential direction R and extend along the axial direction. The stator 20 may have a region 22 that extends in the axial direction and is exposed to the first flow passage 72. In this case, since the stator 20 has the region 22 exposed to the first flow passage 72, the axial ends 35 of the multiple fins 32 of the heat sink 30 provided on the outer peripheral surface 21b of the stator 20 are provided in the region 22. As a result, the gas taken in the flow passage 72 can reach the ends 35 of the multiple fins 32 arranged side by side in the circumferential direction R via the region 22 and pass through the spaces between the multiple fins 32 (second flow passages 73). Therefore, the motor 1 and the rotor accommodating device 2 can exhibit appropriate cooling performance.

[0064] Furthermore, in the motor 1 and the rotor accommodating device 2, at least one heat sink 30 may be provided in the axial center portion 23a of the stator 20, and the pair of support members 40 may have outer peripheral surfaces 21b of both end portions 23b of the stator 20, both end faces 21d facing the axial direction of the rotation axis L, and portions (first inner extending portion 43, first outer extending portion 44, second inner extending portion 45, and second outer extending portion 46) facing both axial end portions 36 of the at least one heat sink 30. In this case, the pair of support members 40 can support the stator 20 so as to suppress oscillation of the stator 20 in the radial direction D and the axial direction of the rotation axis L. Therefore, the stator 20 can be appropriately supported without performing special processing on the stator 20. Furthermore, since a pair of support members 40 are arranged on both sides of at least one heat sink 30, the stator 20 can be properly supported as described above even if the entire stator 20 is not supported by a housing such as a motor housing.

[0065] Although various exemplary embodiments have been described above, the present disclosure is not limited to the above-described exemplary embodiments, and various omissions, substitutions, and modifications may be made. For example, the rotor accommodating device 2 may not include the covering member 50. In this case, the fixing member 60 may be provided so as to directly contact the outer periphery 33 of at least one heat sink 30. Furthermore, instead of the covering member 50, the fixing member 60 may cover the outer periphery 33 of at least one heat sink 30 and form a second flow path 73 between the fixing member 60 and the multiple fins 32.

[0066] The cooling section 70 may be provided so as to cover the end 35 of at least one heat sink 30 provided on the stator 20. In this case, the first flow path 72 may not be provided, and the stator 20 may not have the region 22. In this case, the at least one heat sink 30 can be provided over a wide area of ​​the stator 20, thereby improving cooling performance.

[0067] [Note] The rotor receiving device and the motor include the following components.

[0068] [Form 1] a rotor having a shaft rotatable about a rotation axis, a stator extending along the rotation axis and disposed circumferentially relative to the rotation axis; a pair of support members that support both axial ends of the stator along the rotation axis; At least one heat sink having a plurality of fins radially outward of the rotation axis and covering an outer peripheral surface of the stator; a fixing member extending in a circumferential direction of the at least one heat sink and fixing the stator and the at least one heat sink from the radially outer side of the at least one heat sink; A rotor containing device comprising:

[0069] [Form 2] The rotor accommodating device according to [Mode 1], wherein the at least one heat sink is in contact with an outer peripheral surface of the stator.

[0070] [Form 3] The rotor accommodating device according to the above-mentioned [Mode 1] or [Mode 2], wherein the fixing member is strip-shaped and binds the stator and the at least one heat sink together.

[0071] [Form 4] The rotor accommodating device according to any one of the above [Mode 1] to [Mode 3], wherein the at least one heat sink is a plurality of heat sinks arranged side by side in the circumferential direction.

[0072] [Form 5] The rotor accommodating device according to any one of the above [Mode 1] to [Mode 4] further comprises a covering member that covers the outer periphery of the at least one heat sink and forms a flow path between the covering member and the plurality of fins, and the covering member is fixed together with the at least one heat sink by the fixing member.

[0073] [Form 6] the stator and one of the pair of support members form a flow path through which gas taken in from the outside toward the rotation axis line can flow, The plurality of fins are arranged side by side in the circumferential direction and extend along the axial direction, The stator extends in the axial direction and has a region exposed to the flow path. The rotor accommodating device according to any one of the above [Mode 1] to [Mode 5].

[0074] [Form 7] the at least one heat sink is provided at a central portion of the stator in the axial direction, the pair of support members have portions facing the outer circumferential surfaces of the both end portions of the stator, both end faces facing the axial direction of the rotation axis, and both end portions of the at least one heat sink in the axial direction; The rotor accommodating device according to any one of the above [Mode 1] to [Mode 6].

[0075] [Form 8] A rotor accommodating device according to any one of the above [Mode 1] to [Mode 7]; a rotor disposed inside the stator; A motor comprising: [Explanation of symbols]

[0076] 1...motor, 2...rotor accommodating device, 10...rotor, 11...shaft, 20...stator, 21b...outer surface, 22...area, 23a...central portion, 30...heat sink, 32...fins, 33...outer surface, 40...support member, 50...covering member, 60...fixing member, 72...first flow path, 73...second flow path, 74...third flow path, D...radial direction, L...rotation axis, R...circumferential direction.

Claims

1. a stator that can be disposed to surround a rotor having a shaft that can rotate around a rotation axis, the stator extending along the rotation axis and disposed along a circumferential direction with respect to the rotation axis; a pair of support members supporting both axial ends of the stator in the rotation axis direction; At least one heat sink having a plurality of fins radially outward from the rotation axis and covering an outer peripheral surface of the stator; a fixing member extending in a circumferential direction of the at least one heat sink and fixing the stator and the at least one heat sink from the radially outer side of the at least one heat sink; A rotor containing device comprising:

2. The rotor containment device of claim 1 , wherein the at least one heat sink contacts an outer peripheral surface of the stator.

3. The rotor accommodating device according to claim 1 or 2, wherein the fixing member is strip-shaped and binds the stator and the at least one heat sink together.

4. The rotor accommodating device according to claim 1 or 2, wherein the at least one heat sink is a plurality of heat sinks arranged side by side in the circumferential direction.

5. 3. The rotor accommodating device according to claim 1, further comprising a covering member that covers an outer periphery of the at least one heat sink and forms a flow path between the covering member and the plurality of fins, the covering member being fixed together with the at least one heat sink by the fixing member.

6. the stator and one of the pair of support members form a flow path through which gas taken in from the outside toward the rotation axis line can flow, The plurality of fins are arranged side by side in the circumferential direction and extend along the axial direction, The stator extends in the axial direction and has a region exposed to the flow path. The rotor accommodating device according to claim 1 or 2.

7. the at least one heat sink is provided at a central portion of the stator in the axial direction, 3. The rotor accommodating device according to claim 1, wherein the pair of support members have portions that face the outer peripheral surfaces of the both ends of the stator, both end faces facing the axial direction of the rotation axis, and both end ends of the at least one heat sink in the axial direction.

8. The rotor accommodating device according to claim 1 or 2; a rotor disposed inside the stator; A motor comprising:

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