Stator and motor

Abstract

To provide a stator capable of improving heat dissipation performance.SOLUTION: A stator 4 is placed in a motor frame 3 together with a rotor 2. The rotor 2 has a rotation axis 22 with an axis Ax1 as a center of rotation, which extends in an extending direction D1 of the axis Ax1. The stator 4 includes a stator core 6, a coil 5, and a heat dissipation member 7. The coil 5 has a winding part 51. The winding part 51 is wound on the stator core 6 to laminate in a winding direction, the rectangular conductor is perpendicular to the extension direction D1 of the axis Ax1. The heat dissipation member 7 has lower hardness than the conductor constituting the coil 5. The heat dissipation member 7 is arranged being sandwiched by the coil 5 and the motor frame 3 in the winding direction. The coil 5 has a contact part 54 that is in face contact with the heat dissipation member 7.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates generally to stators and motors, and more particularly to a stator including a coil and a motor including said stator. [Background technology]

[0002] The motor described in Patent Document 1 includes a stator having a coil, a rotor, and an insulating resin layer provided on the surface of the coil end. The motor described in Patent Document 1 further includes a non-magnetic electric heating member that is arranged in contact with the insulating resin layer and the inner wall surface of the motor housing and thermally connects the insulating resin layer and the inner wall surface of the motor housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-290543 Summary of the Invention [Problem to be solved by the invention]

[0004] When a current flows through the coil, the coil generates heat, causing the temperature inside the motor to rise. If the temperature inside the motor exceeds a certain level, it may shorten the motor's lifespan.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and has an object to provide a stator and a motor with improved heat dissipation performance. [Means for solving the problem]

[0006] A stator according to one aspect of the present disclosure is disposed inside a motor frame together with a rotor. The rotor has a rotation axis that rotates around an axis and extends in the extension direction of the axis. The stator includes a stator core, a plurality of coils, and a heat dissipation member. Each of the plurality of coils has a winding portion. The winding portion is wound around the stator core such that the flat conductor wire is stacked in a winding direction that is perpendicular to the extension direction of the axis. The heat dissipation member has a hardness lower than that of the flat conductor wire. The heat dissipation member is disposed so as to be sandwiched between each of the plurality of coils and the motor frame in the winding direction. Each of the plurality of coils has a contact portion that is in surface contact with the heat dissipation member.

[0007] A stator according to one aspect of the present disclosure is disposed inside a motor frame together with a rotor. The rotor has a rotation axis that rotates around an axis and extends in the extension direction of the axis. The stator includes a stator core, a plurality of coils, and a heat dissipation member. Each of the plurality of coils has a winding portion. The winding portion is wound around the stator core such that the flat conductor wire is stacked in a winding direction that is perpendicular to the extension direction of the axis. The heat dissipation member is formed of a silicone-based resin or a fluorine-based resin. The heat dissipation member is disposed so as to be sandwiched between each of the plurality of coils and the motor frame in the winding direction. Each of the plurality of coils has a contact portion that is in surface contact with the heat dissipation member.

[0008] A motor according to one aspect of the present disclosure includes the stator, the rotor, and the motor frame. Effect of the Invention

[0009] According to the present disclosure, it is possible to provide a stator and a motor with improved heat dissipation performance. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is an exploded perspective view of the motor according to the first embodiment. [Diagram 2]FIG. 2 is a front view of the motor according to the above embodiment. [Diagram 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. [Figure 4] FIG. 4 is a cross-sectional view of a main part of the motor according to the above embodiment. [Diagram 5] FIG. 5 is a side view of a stator of the motor according to the above embodiment. [Figure 6] FIG. 6 is a schematic diagram of a main part of the motor according to the above embodiment. [Figure 7] FIG. 7 is a perspective view of a coil included in the stator according to the embodiment. [Figure 8] FIG. 8 is a schematic diagram of a heat dissipation path of the motor according to the above embodiment. [Figure 9] FIG. 9 is a front view of the coil according to the first modification. [Figure 10] FIG. 10 is a side view of a coil according to the second modification. [Figure 11] FIG. 11 is a schematic diagram of a motor according to the third modification. [Figure 12] FIG. 12 is a perspective view of a coil according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the drawings. In addition, elements common to the embodiments described below are given the same reference numerals, and duplicated descriptions of the common elements will be omitted. Each of the following embodiments is merely one of various embodiments of the present disclosure. Each embodiment can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved.

[0012] Each drawing described in this disclosure is a schematic drawing, and the ratio of the size and thickness of each component in each drawing does not necessarily reflect the actual dimensional ratio. Note that the arrows indicating each direction are merely examples, and are not intended to define the directions in which the motor 1 is used. Also, the arrows indicating each direction in the drawings are merely indicated for the purpose of explanation, and do not have any substance.

[0013] In this disclosure, "orthogonal" does not only mean that the angle between two objects is exactly 90 degrees, but also means that the angle between two objects is approximately orthogonal within a certain margin of error. In other words, the angle between two objects that are orthogonal falls within a certain margin of error (for example, 10 degrees or less) from 90 degrees.

[0014] (Embodiment 1) (1) Overview First, an overview of a motor 1 according to a first embodiment will be described with reference to FIGS.

[0015] As shown in FIG. 1, the motor 1 of the first embodiment includes a rotor 2, a motor frame 3, and a stator 4.

[0016] The rotor 2 has a rotating shaft 22. The rotating shaft 22 rotates about an axis Ax1. The rotating shaft 22 extends in an extension direction D1 of the axis Ax1.

[0017] The stator 4, together with the rotor 2, is disposed inside the motor frame 3 in the radial direction D2 (see FIG. 2). Here, the "radial direction" in this disclosure means the radial direction of a virtual circle C1 centered on the axis Ax1 as shown in FIG. 2. In other words, the "radial direction" is a direction perpendicular to the extension direction D1 of the axis Ax1.

[0018] The stator 4 of the first embodiment includes a plurality of coils 5, a stator core 6, and a heat dissipation member 7. In the following description, when there is no need to distinguish between the plurality of coils 5, each of the plurality of coils 5 may be referred to as a "coil 5."

[0019] 3, the heat dissipation member 7 is disposed so as to be sandwiched between the coil 5 and the motor frame 3 in the radial direction D2. The heat dissipation member 7 is formed of, for example, a silicone-based resin, and has a lower hardness than the conductive wire (for example, copper) that constitutes the coil 5.

[0020] The coil 5 is made of a conductor wire. The conductor wire is made of copper, for example. As shown in FIG. 4, the coil 5 has a winding portion 51. The winding portion 51 is made of a rectangular conductor wire (see FIGS. 5 to 7). Specifically, the winding portion 51 is formed by winding the rectangular conductor wire around the teeth 62 of the stator core 6 so as to be laminated in a winding direction D4 (see FIG. 7). The "winding direction" in this disclosure refers to one direction in the radial direction D2.

[0021] 6, the coil 5 has a contact portion 54 that is in surface-to-surface contact with the heat dissipation member 7. In the present disclosure, "surface contact" refers to a state in which surfaces that are parallel to each other or can be considered to be parallel to each other are in surface-to-surface contact.

[0022] According to the stator 4 of the first embodiment, heat generated in the coil 5 can be dissipated to the motor frame 3 via the heat dissipation member 7. In addition, the conductor forming the contact portion 54 of the coil 5 is in surface contact with the heat dissipation member 7. Therefore, according to the stator of the first embodiment, it is possible to improve the heat dissipation performance compared to, for example, a stator in which the coil and the heat dissipation member are in point or line contact with each other.

[0023] (2)Details Hereinafter, the motor 1 according to the first embodiment will be described in detail with reference to FIGS.

[0024] (2.1) Motor 1, the motor 1 of the first embodiment is an inner rotor type motor. The motor 1 includes a rotor 2, a stator 4, and a motor frame 3.

[0025] (2.2) Rotor The rotor 2 includes a rotor body 21, a rotating shaft 22, and a rotor core 23.

[0026] 2, the rotor body 21 has a circular shape centered on the axis Ax1 in a plan view along the extension direction D1. Also, as shown in FIG 3, the cross section of the rotor body 21 along the radial direction D2 has an H-shape.

[0027] The rotor body 21 is disposed inside the rotor core 23 in the radial direction D2. The rotor body 21 holds a rotating shaft 22. The rotor body 21 is made of, for example, iron. The rotor body 21 may also be made of silicon steel, permalloy, ferrite, or the like.

[0028] The rotating shaft 22 protrudes along an extension direction D1 of the axis Ax1 from the center of the rotor body 21. As shown in Fig. 2, the rotating shaft 22 of the first embodiment has a cylindrical shape centered on the axis Ax1.

[0029] The rotor core 23 is disposed outside the rotor body 21 in the radial direction D2. The rotor core 23 is fixed to the rotor body 21. The rotor core 23 has a cylindrical shape centered on the axis Ax1. The rotor core 23 is made of iron, for example. The rotor core 23 may be made of silicon steel, permalloy, ferrite, or the like.

[0030] 4, rotor core 23 holds a plurality of magnets 231. The plurality of magnets 231 are arranged such that N poles and S poles are alternately arranged in the circumferential direction (circumferential direction D3 of imaginary circle C1) of rotor core 23. The plurality of magnets 231 are permanent magnets such as neodymium magnets.

[0031] The rotor core 23 rotates due to the interaction between the magnetic field generated by the multiple magnets 231 and the magnetic field generated by current flowing through the multiple coils 5 of the stator 4. The rotor core 23, the rotor body 21, and the rotating shaft 22 rotate integrally about the axis Ax1.

[0032] (2.3) Motor frame The motor frame 3 is disposed outside the stator 4 in the radial direction D2. As shown in Fig. 3, the motor frame 3 has a main body portion 31 and a plurality of flow passages 32 (two in the example of Fig. 3).

[0033] 2, the shape of the main body 31 is a cylinder centered on an axis Ax1. The main body 31 of the first embodiment is made of a metal such as iron. However, the main body 31 may be made of a resin such as engineering plastic.

[0034] 3, the multiple flow paths 32 are formed inside the main body 31 (motor frame 3). In the following description, when there is no need to distinguish between the multiple flow paths 32, each of the multiple flow paths 32 may be referred to as a "flow path 32."

[0035] The flow path 32 is formed along the shape of the main body 31, and has a circular shape. A liquid such as water W1 (see FIG. 8) passes through the flow path 32. The flow path 32 is connected to a flow path outside the motor 1, and the water W1 flowing through the flow path 32 is a heat dissipation path from the inside of the motor frame 3 (motor 1) to the outside of the motor frame 3 (motor 1). The liquid flowing through the flow path 32 is not limited to water W1, and may be water containing an additive, or oil.

[0036] (2.4) Stator 2, the overall shape of the stator 4 is a cylinder centered on an axis Ax1. The stator 4 includes a plurality of coils 5 (18 coils in the example of FIG. 2), a stator core 6, and a heat dissipation member 7.

[0037] The stator core 6 has an outer circumferential portion 61 and a plurality of teeth 62 (18 teeth in the example of FIG. 2).

[0038] The outer peripheral portion 61 has a cylindrical shape centered on the axis Ax1. The outer peripheral portion 61 is made of, for example, silicon steel.

[0039] The multiple teeth 62 are arranged at equal intervals along the circumferential direction of the outer peripheral portion 61 (the circumferential direction D3 of the imaginary circle C1). The multiple teeth 62 protrude from the inner circumferential surface of the outer peripheral portion 61 toward the axis Ax1. The multiple teeth 62 are formed of, for example, silicon steel. In the following description, when there is no need to distinguish between the multiple teeth 62, each of the multiple teeth 62 may be referred to as a "tooth 62."

[0040] The coils 5 are arranged at equal intervals along the circumferential direction D3 of the imaginary circle C1. Specifically, each of the coils 5 is formed by winding around a corresponding one of the teeth 62. As described above, the coils 5 are formed of a conductor such as copper.

[0041] 5 is a side view (plan view along radial direction D2) of the stator 4 with the heat dissipation member 7 removed. In the following description, the portion of the coil 5 that does not overlap with the outer periphery 61 of the stator core 6 in a plan view along radial direction D2 (winding direction D4) may be referred to as a "coil end." In the example of FIG. 5, the coil 5 has two coil ends 501, 502.

[0042] As shown in FIG. 7, the coil 5 of the first embodiment has a winding portion 51, a first lead portion 52, a second lead portion 53, a contact portion 54, and a stopper portion 55.

[0043] The winding portion 51 is formed by winding a rectangular conductor wire having a rectangular cross section around the teeth 62 in a so-called edgewise winding manner so as to be laminated in a winding direction D4 (lamination direction).

[0044] The first drawn-out portion 52 extends from a first end 511 (one end) of the winding portion 51. The first drawn-out portion 52 of the first embodiment extends from the first end 511 of the winding portion 51 along an extension direction D1 of the axis Ax1. The first drawn-out portion 52 has a rectangular shape in a plan view along the winding direction D4. The first drawn-out portion 52 functions as an input / output portion for electric power.

[0045] The contact portion 54 in the first embodiment (shown with dots in Figures 5, 7, 9, and 12) is provided on the winding portion 51. Specifically, the contact portion 54 is provided on the outermost layer of the winding portion 51 in the direction along the winding direction D4, which is the coil end 501 (see Figure 5). As shown in Figure 6, the contact portion 54 faces the heat dissipation member 7 in the winding direction D4. As described above, the contact portion 54 is in surface contact with the heat dissipation member 7 in the winding direction D4. The contact portion 54 in the first embodiment has a protrusion 541.

[0046] The protrusion 541 protrudes toward the heat dissipation member 7 (motor frame 3) along the winding direction D4. The shape of the protrusion 541 is a rectangle whose longitudinal direction is perpendicular to the extension direction D1 and the winding direction D4 in a plan view along the winding direction D4. The protrusion 541 is formed, for example, by bending a rectangular conductor wire.

[0047] 7, the protruding portion 541 has a first surface 5411 perpendicular to the winding direction D4 and a pair of second surfaces 5412 perpendicular to the extension direction D1. The first surface 5411 is in surface contact with the heat dissipation member 7 in the winding direction D4. The pair of second surfaces 5412 are in surface contact with the heat dissipation member 7 in the extension direction D1. That is, by having the protruding portion 541, the contact portion 54 of the first embodiment can increase the contact area with the heat dissipation member 7 and improve the heat dissipation performance.

[0048] Furthermore, since the pair of second surfaces 5412 are in surface contact with the heat dissipation member 7 in the extension direction D1, it is possible to prevent the heat dissipation member 7 from falling off (shifting) along the extension direction D1.

[0049] The contact portion 54 may have a recess instead of the protrusion 541. That is, the contact portion 54 may have at least one of the recess and the protrusion 541. Even when the contact portion 54 has only a recess, it is possible to increase the contact area between the contact portion 54 and the heat dissipation member 7 and to prevent the heat dissipation member 7 from shifting along the extension direction D1.

[0050] The stopper portion 55 of the first embodiment has a first portion 552 and a second portion 553. The first portion 552 protrudes (extends) from the first end 511 (one end) of the winding portion 51 toward the motor frame 3 along the winding direction D4. The second portion 553 protrudes (extends) from one end of the first portion 552 along a direction perpendicular to the extension direction D1 of the axis Ax1 and the winding direction D4. The stopper portion 55 is disposed on the outer side (motor frame 3 side) of the contact portion 54 in the winding direction D4. The shape of the stopper portion 55 is L-shaped in a plan view along the extension direction D1. Note that a gap Sp2 is formed between the second portion 553 and the contact portion 54 in the winding direction D4.

[0051] The stopper portion 55 faces the heat dissipation member 7 in the extension direction D1 of the axis Ax1. More specifically, the stopper portion 55 is in surface contact with the heat dissipation member 7 in the extension direction D1. As shown in Fig. 6, the stopper portion 55 and the stator core 6 are disposed to sandwich at least a part of the heat dissipation member 7 in the extension direction D1.

[0052] The stopper portion 55 is in surface contact with the heat dissipation member 7 in the extension direction D1, so that the heat dissipation member 7 sandwiched between the coil 5 and the motor frame 3 in the winding direction D4 can be prevented from shifting along the extension direction D1. Also, the stopper portion 55 in the first embodiment is a part of the coil 5, and functions as a heat dissipation portion that dissipates heat generated in the coil 5 to the heat dissipation member 7, which has the advantage of improving the heat dissipation performance of the stator 4.

[0053] 5, the stopper portion 55 (second portion 553) of the first embodiment has a plurality of (four in the example of FIG. 7) protrusions 551. The plurality of protrusions 551 are aligned along the extension direction of the second portion 553 of the stopper portion 55 (a direction perpendicular to the extension direction D1 of the axis Ax1 and the winding direction D4). In the following description, when there is no need to distinguish between the plurality of protrusions 551, each of the plurality of protrusions 551 may be referred to as a "protrusion 551."

[0054] The protruding portion 551 has a first surface 5511 perpendicular to the extension direction D1, and a pair of second surfaces 5512 perpendicular to a direction perpendicular to the extension direction D1 and the winding direction D4. The first surface 5511 is in surface contact with the heat dissipation member 7 in the extension direction D1. The pair of second surfaces 5512 are in surface contact with the heat dissipation member 7 in a direction perpendicular to the extension direction D1 and the winding direction D4. That is, by having the protruding portion 551, the stopper portion 55 of the first embodiment can increase the contact area with the heat dissipation member 7, and can improve the heat dissipation performance.

[0055] Furthermore, since the pair of second surfaces 5512 are in surface contact with the heat dissipation member 7 in a direction perpendicular to the extension direction D1 and the winding direction D4, it is possible to prevent the heat dissipation member 7 from shifting in a direction perpendicular to the extension direction D1 and the winding direction D4.

[0056] Furthermore, since the stopper portion 55 of embodiment 1 has multiple protrusions 551 along the extension direction of the second portion 553 of the stopper portion 55, the heat dissipation performance is further improved and the shifting of the heat dissipation member 7 can be further suppressed compared to when there is only one protrusion 551.

[0057] The stopper portion 55 may have a recess instead of the protrusion 551. That is, the stopper portion 55 may have at least one of a recess or a protrusion 551. Even when the stopper portion 55 has only a recess, it is possible to increase the contact area between the stopper portion 55 and the heat dissipation member 7 and to prevent the heat dissipation member 7 from shifting in a direction perpendicular to the extension direction D1 and the winding direction D4.

[0058] The second drawn-out portion 53 extends from one end of the stopper portion 55. The second drawn-out portion 53 of the first embodiment extends from one end of the second portion 553 of the stopper portion 55 along the winding direction D4, is bent, and extends along the extension direction D1 of the axis Ax1. The shape of the second drawn-out portion 53 is rectangular in a plan view along the winding direction D4. The second drawn-out portion 53 functions as an input / output portion for electric power.

[0059] 2, the heat dissipation member 7 has a cylindrical shape centered on the axis Ax1. The heat dissipation member 7 is disposed outside the multiple coils 5 in the radial direction D2 (winding direction D4). More specifically, the heat dissipation member 7 of the first embodiment is disposed outside the coil ends 501 (see FIG. 5) of the multiple coils 5 in the radial direction D2. The heat dissipation member 7 of the first embodiment is in surface contact with the motor frame 3 and the contact portions 54 and stopper portions 55 of each of the multiple coils 5.

[0060] The heat dissipation member 7 is formed of a material having electrical insulation and a lower hardness than the conductive wire forming the coil 5. The heat dissipation member 7 of the first embodiment is formed of a material having electrical insulation and a lower hardness than the rectangular conductive wire forming the winding portion 51. The heat dissipation member 7 is formed of a viscous material such as a gel. The heat dissipation member 7 may be formed of a material obtained by hardening a viscous material. The heat dissipation member 7 is formed of, for example, a silicone-based resin or a fluorine-based resin. In the first embodiment, the heat dissipation member 7 is formed of a silicone-based resin, and the hardness of the heat dissipation member 7 is 1.6 in accordance with JISK 6253 (Type E), and the thermal conductivity is 2.8 [W / m·K]. When the heat dissipation member 7 is formed of a silicone-based resin, there is an advantage that the cost of the heat dissipation member 7 can be easily reduced. The hardness of the heat dissipation member 7 is preferably about 1 to 20 in accordance with JISK 6253 (Type E).

[0061] The hardness of the heat dissipation member 7 is lower than that of the conductive wire (eg, copper) that constitutes the coil 5. The hardness of the heat dissipation member 7 is also lower than that of the motor frame 3 and that of the stator core 6.

[0062] (3) Heat dissipation path Next, the heat dissipation path from the coil 5 will be described with reference to FIG.

[0063] First, heat (copper loss) is generated in the coil 5 as a result of current flowing through the coil 5. The heat generated in the coil 5 is transferred from the coil 5 to the stator core 6. In addition, the heat generated in the stator core 6 (iron loss) and the heat transferred from the coil 5 are transferred from the stator core 6 to the motor frame 3. The heat transferred to the motor frame 3 is then transferred to the air A1 in contact with the motor frame 3 and to the water W1 passing through the flow path 32 of the motor frame 3.

[0064] In the motor 1 of the first embodiment, since the heat dissipation member 7 is interposed between the coil 5 and the motor frame 3, the heat generated in the coil 5 moves to the motor frame 3 via the heat dissipation member 7. That is, in the motor 1 of the first embodiment, since the heat dissipation member 7 is interposed between the coil 5 and the motor frame 3, the number of heat dissipation paths for the heat generated in the coil 5 is increased, and the heat dissipation performance can be improved. Furthermore, since the coil 5 and the heat dissipation member 7 of the first embodiment are in surface contact, the heat dissipation performance can be further improved compared to the case where the coil 5 and the heat dissipation member 7 are in point-like or line-like contact.

[0065] (4) Variations The first embodiment is merely one of various embodiments of the present disclosure. The first embodiment can be modified in various ways depending on the design and the like as long as the object of the present disclosure can be achieved.

[0066] Below, we will list some modified examples of the first embodiment. The modified examples described below can be applied in appropriate combination with the first embodiment.

[0067] (4.1) Variation 1 The number and shape of the protrusions 541 of the contact portion 54 can be set appropriately. The coil 5a shown in FIG.

[0068] The second lead-out portion 53 of the coil 5a extends along the extension direction D1 from the first end 511 (one end) of the winding portion 51. That is, the coil 5a does not have a stopper portion 55.

[0069] The contact portion 54 of the coil 5a has a plurality of (two in the example of FIG. 9) protruding portions 542 and a plurality of (three in the example of FIG. 9) protruding portions 543. In the following description, when the plurality of protruding portions 542 are not distinguished from one another, each of the plurality of protruding portions 542 may be referred to as a "protruding portion 542." In the following description, when the plurality of protruding portions 543 are not distinguished from one another, each of the plurality of protruding portions 543 may be referred to as a "protruding portion 543."

[0070] The plurality of protruding portions 542 are arranged along the extending direction D1. The protruding portions 542 protrude toward the heat dissipating member 7 (motor frame 3) along the winding direction D4. The shape of the protruding portion 542 is a rectangular parallelepiped whose longitudinal direction is perpendicular to the extending direction D1 and the winding direction D4. Like the protruding portion 541, the protruding portion 542 has a surface that comes into surface contact with the heat dissipating member 7 in the winding direction D4 and a surface that comes into surface contact with the heat dissipating member 7 in the extending direction D1. That is, the contact portion 54 has the protruding portion 542, which is advantageous in that the contact area between the contact portion 54 and the heat dissipating member 7 can be increased, and that the heat dissipating member 7 can be prevented from shifting along the extending direction D1. That is, the protruding portion 542 functions as a heat dissipating portion and a stopper portion.

[0071] Furthermore, since the convex portion 542 has a surface that comes into face-to-face contact with the heat dissipation member 7 in a direction perpendicular to the extension direction D1 and the winding direction D4, it is possible to prevent the heat dissipation member 7 from shifting along a direction perpendicular to the extension direction D1 and the winding direction D4.

[0072] The multiple protrusions 543 are aligned along a direction inclined at approximately 45° with respect to the extension direction D1. The protrusions 543 protrude toward the heat dissipation member 7 along the winding direction D4. The heat dissipation member 7 has a cubic shape. That is, by having the protrusions 543 in the contact portion 54, there is an advantage that the contact area between the contact portion 54 and the heat dissipation member 7 can be increased, and that the heat dissipation member 7 can be prevented from shifting along the extension direction D1. That is, the protrusions 543 function as a heat dissipation portion and a stopper portion.

[0073] Furthermore, since the convex portion 543 has a surface that comes into face-to-face contact with the heat dissipation member 7 in a direction perpendicular to the extension direction D1 and the winding direction D4, it is possible to prevent the heat dissipation member 7 from shifting along a direction perpendicular to the extension direction D1 and the winding direction D4.

[0074] (4.2) Variation 2 The contact portion 54 of the coil 5 may be provided across the winding portion 51 and the second lead-out portion 53. The coil 5b shown in FIG.

[0075] The second lead-out portion 53 of the coil 5b extends along the extension direction D1 from the first end 511 (one end) of the winding portion 51. That is, the coil 5b does not have a stopper portion 55.

[0076] The contact portion 54 of the coil 5b is provided across the winding portion 51 and the second drawn-out portion 53. When the contact portion 54 is provided across the winding portion 51 and the second drawn-out portion 53, it is preferable to enlarge the heat dissipation member 7 along the extension direction D1 so that the heat dissipation member 7 and the second drawn-out portion 53 face each other in the winding direction D4, as shown in FIG.

[0077] By providing the contact portion 54 across the winding portion 51 and the second drawn-out portion 53, the contact area between the contact portion 54 and the heat dissipation member 7 can be increased.

[0078] (4.3) Variation 3 The heat dissipation member 7 may be disposed so as to be sandwiched in the extension direction D1 between the coil 5 and the motor frame 3. A motor 1a shown in FIG.

[0079] The motor frame 3a included in the motor 1a has a pair of bottom surfaces 33 that close a pair of openings in a main body 31. The motor frame 3a houses the rotor 2 and the stator 4 in a space surrounded by the main body 31 and the pair of bottom surfaces 33.

[0080] In the motor 1a, the heat dissipation member 7 is disposed so as to be sandwiched between the coil 5 and the motor frame 3a not only in the winding direction D4 but also in the extension direction D1. The heat dissipation member 7 is in surface contact with the coil 5 and the motor frame 3a also in the winding direction D4. By disposing the heat dissipation member 7 so as to be sandwiched between the coil 5 and the motor frame 3a also in the extension direction D1, the contact area between the coil 5 and the heat dissipation member 7 can be further increased.

[0081] Furthermore, in motor 1a, heat dissipation member 7 is arranged not only on coil end 501 side of coil 5 but also on coil end 502 side of coil 5. By arranging heat dissipation member 7 also on coil end 502 side, the contact area between coil 5 and heat dissipation member 7 can be further increased.

[0082] The motor frame 3a may include, for example, a bracket for supporting the bearing 34. When the motor frame 3a includes a bracket, the heat dissipation member 7 may be disposed so as to be sandwiched between the coil 5 and the bracket.

[0083] (4.4) Other Modifications The heat dissipation member 7 may be made of a fluororesin. By making the heat dissipation member 7 of a fluororesin, the oil resistance of the heat dissipation member 7 can be improved.

[0084] The stator 4 may further include a heat dissipation member 7 (inter-coil heat dissipation member) arranged in a gap Sp1 (see FIG. 4) between two adjacent coils 5 of the multiple coils 5. The inter-coil heat dissipation member arranged in the gap Sp1 may be continuous with the heat dissipation member 7 sandwiched between the contact portion 54 of the coil 5 and the motor frame 3. Furthermore, the inter-coil heat dissipation member arranged in the gap Sp1 itself may be in contact with the motor frame 3. By further including an inter-coil heat dissipation member arranged in the gap Sp1 in the stator 4, it is possible to further increase the number of heat dissipation paths from the coils 5.

[0085] (Embodiment 2) The coil 5c according to the second embodiment differs from the coil 5 according to the first embodiment in that it has a protruding portion 56.

[0086] As shown in FIG. 12, the coil 5 c of the second embodiment has a protrusion 56 .

[0087] The protrusion 56 protrudes from an end of the stopper portion 55 toward the stator core 6 (see FIG. 6) along the extension direction D1 of the axis Ax1. More specifically, the protrusion 56 protrudes from an end of the second portion 553 of the stopper portion 55 that is closer to the contact portion 54 toward the stator core 6. The protrusion 56 is disposed between the contact portion 54 and the motor frame 3 (see FIG. 6) in the winding direction D4.

[0088] The protrusion 56 has a plate-like shape and is rectangular in a plan view along the winding direction D4. The protrusion 56 of the first embodiment is in surface contact with the heat dissipation member 7 in the winding direction D4. That is, the protrusion 56 also functions as a heat dissipation portion (contact portion 54).

[0089] Since the heat dissipation member 7 can be sandwiched between the contact portion 54 and the protruding portion 56 in the winding direction D4, the heat dissipation member 7 can be prevented from shifting.

[0090] Here, it is assumed that a material to become the heat dissipation member 7 is poured between the coil 5c and the motor frame 3 and hardened to form the heat dissipation member 7. The coil 5c has the protrusion 56, which can prevent the material poured between the coil 5c and the motor frame 3 from leaking out of the gap Sp2 and causing the coil 5c and the heat dissipation member 7 to not come into surface contact with each other.

[0091] The second embodiment is merely one of various embodiments of the present disclosure. The second embodiment can be modified in various ways depending on the design and the like as long as the object of the present disclosure can be achieved.

[0092] The protruding portion 56 may have at least one of a convex portion that protrudes along the winding direction D4 and a concave portion that is recessed along the winding direction D4.

[0093] The various configurations (including modified examples) described in the second embodiment can be adopted in appropriate combination with the various configurations (including modified examples) described in the first embodiment.

[0094] (summary) As described above, the stator (4) according to the first embodiment is disposed inside the motor frame (3; 3a) together with the rotor (2). The rotor (2) has a rotating shaft (22) that rotates about the axis (Ax1) and extends in the extension direction (D1) of the axis (Ax1). The stator (4) includes a stator core (6), a plurality of coils (5; 5a; 5b; 5c), and a heat dissipation member (7). Each of the plurality of coils (5; 5a; 5b; 5c) has a winding portion (51). The winding portion (51) is wound around the stator core (6) such that the rectangular conductor is layered in a winding direction (D4) that is perpendicular to the extension direction (D1) of the axis (Ax1). The heat dissipation member (7) has a hardness lower than that of the rectangular conductor. The heat dissipation member (7) is disposed so as to be sandwiched between each of the coils (5; 5a; 5b; 5c) and the motor frame (3; 3a) in the winding direction (D4). Each of the coils (5; 5a; 5b; 5c) has a contact portion (54) that is in surface contact with the heat dissipation member (7).

[0095] According to this embodiment, the heat generated in the coils (5; 5a; 5b; 5c) can be dissipated to the motor frame (3; 3a) via the heat dissipation member 7. In addition, since the contact portions (54) of the coils (5; 5a; 5b; 5c) are in surface contact with the heat dissipation member (7), the heat dissipation performance can be improved compared to, for example, a stator in which the coils (5; 5a; 5b; 5c) and the heat dissipation member (7) are in point or line contact.

[0096] The stator (4) according to the second embodiment is disposed inside the motor frame (3; 3a) together with the rotor (2). The rotor (2) has a rotating shaft (22) that rotates about an axis (Ax1) and extends in an extension direction (D1) of the axis (Ax1). The stator (4) includes a stator core (6), a plurality of coils (5; 5a; 5b; 5c), and a heat dissipation member (7). Each of the plurality of coils (5; 5a; 5b; 5c) has a winding portion (51). The winding portion (51) is wound around the stator core (6) such that the rectangular conductor is layered in a winding direction (D4) that is perpendicular to the extension direction (D1) of the axis (Ax1). The heat dissipation member (7) is formed of a silicone-based resin or a fluorine-based resin. The heat dissipation member (7) is disposed so as to be sandwiched between each of the coils (5; 5a; 5b; 5c) and the motor frame (3; 3a) in the winding direction (D4). Each of the coils (5; 5a; 5b; 5c) has a contact portion (54) that is in surface contact with the heat dissipation member (7).

[0097] According to this embodiment, the heat generated in the coils (5; 5a; 5b; 5c) can be dissipated to the motor frame (3; 3a) via the heat dissipation member 7. In addition, since the contact portions (54) of the coils (5; 5a; 5b; 5c) are in surface contact with the heat dissipation member (7), the heat dissipation performance can be improved compared to, for example, a stator in which the coils (5; 5a; 5b; 5c) and the heat dissipation member (7) are in point or line contact.

[0098] In the stator (4) according to the third aspect, in the first or second aspect, the contact portion (54) has at least one of a recessed portion or a protruding portion (541).

[0099] According to this embodiment, the contact area between the contact portion (54) and the heat dissipation member (7) can be increased, thereby improving the heat dissipation performance.

[0100] In the stator (4) according to the fourth aspect, in the third aspect, at least one of the recessed portion or the protruding portion (541) of the contact portion (54) has a surface (second surface 5412) that comes into surface contact with the heat dissipation member (7) in the extension direction (D1) of the axis (Ax1).

[0101] According to this embodiment, the surface (second surface 5412) of the concave or convex portion (541) is in surface contact with the heat dissipation member (7) in the extension direction (D1), thereby preventing the heat dissipation member (7) from falling off (shifting) along the extension direction (D1).

[0102] In the stator (4) according to the fifth aspect, in any one of the first to fourth aspects, each of the plurality of coils (5; 5c) further has a stopper portion (55) that comes into surface contact with the heat dissipation member (7) in the extension direction (D1) of the axis (Ax1).

[0103] According to this embodiment, the stopper portion (55) comes into surface contact with the heat dissipation member (7) in the extension direction (D1), thereby preventing the heat dissipation member (7) sandwiched between the coil (5; 5c) and the motor frame (3; 3a) in the winding direction (D4) from shifting along the extension direction (D1). Furthermore, the stopper portion (55) functions as a heat dissipation portion that dissipates heat generated in the coil (5; 5c) to the heat dissipation member (7), which is advantageous in that the heat dissipation performance of the stator (4) is improved.

[0104] In the stator (4) according to the sixth aspect, in the fifth aspect, the stopper portion (55) has at least one of a recessed portion or a protruding portion (551).

[0105] According to this embodiment, the contact area between the stopper portion (55) and the heat dissipating member (7) can be increased, thereby improving the heat dissipating performance. Also, the heat dissipating member (7) can be prevented from shifting.

[0106] In the stator (4) according to the seventh aspect, in the sixth aspect, the stopper portion (55) has at least one of a recessed portion or a protruding portion (551) along a direction perpendicular to the extension direction (D1) of the axis (Ax1) and the winding direction (D4).

[0107] According to this embodiment, compared to the case where there is one recess or protrusion (551), the heat dissipation performance can be further improved and the displacement of the heat dissipation member (7) can be further suppressed.

[0108] In the stator (4) according to an eighth aspect, in any one of the fifth to seventh aspects, each of the coils (5c) further has a plate-shaped protruding portion (56). The protruding portion (56) protrudes from an end of the stopper portion (55) toward the stator core (6) along the extension direction (D1) of the axis (Ax1). The protruding portion (56) is disposed between the contact portion (54) and the motor frame (3; 3a) in the winding direction (D4).

[0109] According to this embodiment, the heat dissipation member (7) can be sandwiched between the contact portion (54) and the protrusion (56) in the winding direction (D4), so that the heat dissipation member (7) can be prevented from shifting.

[0110] The stator (4) according to the ninth aspect is in any one of the first to eighth aspects, and further includes an inter-coil heat dissipation member (heat dissipation member 7) arranged between two adjacent coils (5; 5a; 5b; 5c) among the plurality of coils (5; 5a; 5b; 5c).

[0111] According to this embodiment, it is possible to further increase the number of heat dissipation paths from the coils (5; 5a; 5b; 5c).

[0112] In the stator (4) according to the tenth aspect, in any one of the first to ninth aspects, the motor frame (3; 3a) has a flow path (32) through which a liquid (water H1) passes. The flow path (32) is formed inside the motor frame (3; 3a).

[0113] According to this embodiment, the flow path (32) inside the motor frame (3; 3a) is connected to, for example, the flow path (32) outside the motor frame (3; 3a), thereby creating a heat dissipation path between the inside of the motor frame (3; 3a) and the outside of the motor frame (3; 3a), thereby improving heat dissipation performance.

[0114] In the stator (4) according to an eleventh aspect, in any one of the first and third to tenth aspects, the heat dissipation member (7) is made of a silicone resin or a fluorine resin.

[0115] According to this embodiment, when the heat dissipation member 7 is made of a silicone-based resin, it is advantageous in that it is easy to reduce the cost of the heat dissipation member 7. Also, when the heat dissipation member 7 is made of a fluorine-based resin, it is possible to improve the oil resistance of the heat dissipation member 7.

[0116] The configurations other than those of the first embodiment are not essential to the stator (4) and may be omitted as appropriate.

[0117] A motor (1; 1a) according to a twelfth aspect includes a stator (4) according to any one of the first to eleventh aspects, a rotor (2), and a motor frame (3; 3a).

[0118] According to this embodiment, the stator (4) can dissipate heat generated in the coils (5; 5a; 5b; 5c) to the motor frame (3; 3a) via the heat dissipation member (7). In addition, since the contact portions (54) of the coils (5; 5a; 5b; 5c) are in surface contact with the heat dissipation member (7), the heat dissipation performance can be improved compared to, for example, a stator in which the coils (5; 5a; 5b; 5c) and the heat dissipation member (7) are in point or line contact. [Explanation of symbols]

[0119] 1,1a Motor 2 Rotors 22 Rotation axis 3,3a Motor frame 32 Flow Path 4 Stator 5,5a,5b,5c coils 51 Winding section 54 Contact part 541,542,543 Convex 55 Stopper part 551 Convex 56 Protrusion 6 Stator core 7 Heat dissipation materials D1: Extension direction of shaft center D4 Winding direction W1 Water (liquid)

Claims

1. a rotor having a rotation axis extending in a direction in which the axis is extended and having a rotation center at a central axis; and a stator disposed inside a motor frame together with the rotor, A stator core; A plurality of coils each having a winding portion in which a flat conductor wire is wound around the stator core in a winding direction perpendicular to the extending direction of the axis, A heat dissipation member having a hardness lower than that of the flat conductor wire; Equipped with the heat dissipation member is disposed so as to be sandwiched between each of the coils and the motor frame in the winding direction, Each of the plurality of coils further has a contact portion that is in surface contact with the heat dissipation member. Stator.

2. a rotor having a rotation axis extending in a direction in which the axis is extended and having a rotation center at a central axis; and a stator disposed inside a motor frame together with the rotor, A stator core; A plurality of coils each having a winding portion in which a flat conductor wire is wound around the stator core in a winding direction perpendicular to the extending direction of the axis, a heat dissipation member formed of a silicone resin or a fluorine resin; Equipped with the heat dissipation member is disposed so as to be sandwiched between each of the coils and the motor frame in the winding direction, Each of the plurality of coils further has a contact portion that is in surface contact with the heat dissipation member. Stator.

3. The contact portion has at least one of a recessed portion and a protruding portion.

3. A stator according to claim 1 or 2.

4. At least one of the recess and the protrusion of the contact portion has a surface that comes into surface contact with the heat dissipation member in the extension direction of the axis. The stator according to claim 3 .

5. Each of the coils further includes a stopper portion that is in surface contact with the heat dissipation member in the extension direction of the axis. A stator according to any one of claims 1 to 4.

6. The stopper portion has at least one of a recessed portion and a protruding portion. The stator according to claim 5 .

7. The stopper portion has at least one of the recessed portion and the protruding portion arranged along a direction perpendicular to the extension direction of the axis and the winding direction.

7. The stator according to claim 6.

8. Each of the coils further includes a plate-shaped protruding portion protruding from an end of the stopper portion toward the stator core along the extension direction of the axis, The protrusion is disposed between the contact portion and the motor frame in the winding direction. A stator according to any one of claims 5 to 7.

9. Further comprising an inter-coil heat dissipation member disposed between two adjacent coils of the plurality of coils. A stator according to any one of claims 1 to 8.

10. The motor frame has a flow passage through which a liquid passes, The flow path is formed inside the motor frame. A stator according to any one of claims 1 to 9.

11. The heat dissipation member is formed of a silicone resin or a fluorine resin. A stator according to any one of claims 1 and 3 to 10.

12. A stator according to any one of claims 1 to 11; The rotor; The motor frame; Equipped with Motor.

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