JP2019088082A - motor - Google Patents

Abstract

To provide a motor capable of efficiently exhausting heat of a coil.SOLUTION: A motor comprises a plurality of teeth, a plurality of coils, and a plurality of resin members. The plurality of teeth are arranged along a circumferential direction. The plurality of coils surround respective plurality of teeth. The plurality of resin members are provided in respective gaps formed between the adjoining two coils.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a motor.

  Conventionally, the motor has a cylindrical metal member and a plurality of teeth disposed along the circumferential direction of the metal member, and each of the plurality of teeth is surrounded by a coil. Moreover, both are insulated by interposing an insulation member between teeth and a coil (for example, refer to patent documents 1).

Unexamined-Japanese-Patent No. 2002-291190

  However, in the prior art, when the heat generated in the coil is exhausted to the outside, the heat is transmitted to the air in the air gap formed between the adjacent coils and the above-mentioned insulating member to be exhausted, so that it is efficient. It was not possible to say that it was exhausted.

  The present invention is made in view of the above, and an object of the present invention is to provide a motor capable of efficiently removing heat of the coil.

  In order to solve the problems described above and to achieve the object, a motor according to an aspect of the present invention includes a plurality of teeth, a plurality of coils, and a plurality of resin members. The plurality of teeth are arranged along the circumferential direction. The plurality of coils surround each of the plurality of teeth. The plurality of resin members are provided in each of the air gaps formed between two adjacent coils.

  According to one aspect of the present invention, it is possible to provide a motor that can prevent the performance from being degraded by heat.

FIG. 1 is a perspective view of a motor according to the embodiment. FIG. 2 is a perspective view of a motor according to the embodiment. FIG. 3 is a top view of the motor according to the embodiment. FIG. 4A is a perspective view of a first resin member according to the embodiment. FIG. 4B is a bottom view of the motor according to the embodiment. FIG. 5 is a cross-sectional view of the motor according to the embodiment. FIG. 6 is a cross-sectional view of the motor according to the embodiment. FIG. 7 is a cross-sectional view of the motor according to the embodiment. FIG. 8 is a cross-sectional view of a motor according to a modification.

  Hereinafter, a motor according to an embodiment will be described with reference to the drawings. In addition, the relationship of the dimension of each element in drawing, the ratio of each element, etc. may differ from reality. Even between the drawings, there may be a case where the dimensional relationships and ratios differ from one another. In each drawing, in order to make the explanation easy to understand, a three-dimensional orthogonal coordinate system in which the axial direction of the motor 1 is the Z-axis positive direction may be illustrated.

  Moreover, although the following embodiment demonstrates the case where the motor 1 is a brushless motor of an inner-rotor type | mold, the motor 1 may be a brushless motor of an outer-rotor type | mold. In addition, the motor 1 may be applied to another motor such as a brushed motor.

  First, the appearance of the motor 1 according to the embodiment will be described with reference to FIG. As shown in FIG. 1, the motor 1 includes a rotating shaft 2 and a frame 3. Although not illustrated in FIG. 1, the motor 1 includes a plurality of external terminals, and a three-phase alternating current serving as a driving source of the rotary shaft 2 is supplied via the external terminals.

  The rotating shaft 2 extends in the axial direction (Z-axis direction) of the motor 1 and a power transmission mechanism such as a gear rotates with the rotating shaft 2 at one end projecting from the frame 3 described later in the positive Z-axis direction. It is provided possible. In the following, the Z-axis direction may be described as a rotation axis direction.

  The frame 3 is formed of, for example, a metal member containing a metal material such as iron or aluminum, and includes a housing 3a and a lid 3b. The housing portion 3a has a cylindrical shape, in particular a cylindrical shape, and a stator, a rotor, and the like described later are accommodated in the internal space.

  The lid 3 b is a lid that covers an opening at one end of the housing 3 a in the positive Z-axis direction. Moreover, the through-hole which the rotating shaft 2 and the external terminals 4a-4c pass is provided in the cover part 3b.

  The plurality of external terminals (not shown) are formed of, for example, a conductive metal material, extend in the direction of the rotation axis which is the Z-axis direction, and are arranged to project from the lid 3 b of the frame 3. As a result, an external power supply (not shown) can be connected to the external terminal, so that three-phase alternating current can be supplied to the motor 1 from the external power supply. Three external terminals are provided, each corresponding to each phase of three-phase alternating current (U phase, V phase, W phase).

  Next, the inside of the motor 1 will be described using FIGS. 2 and 3. FIG. 2 is a perspective view of the motor 1 according to the embodiment. FIG. 3 is a top view of the motor 1. In FIG. 2 and FIG. 3, the configuration of the motor 1 is partially omitted from the viewpoint of easy viewing.

  As shown in FIGS. 2 and 3, the motor 1 includes a stator 6, an insulator (an example of an insulating member) 7a, a rotor 8, a coil 10, a first resin member 51, and a second resin member 52. Further equipped. Although not illustrated in FIGS. 2 and 3, the motor 1 includes an internal terminal which is a terminal for electrically connecting the plurality of coils 10 to each other.

  The stator 6 has a cylindrical magnetic member. The magnetic member is a magnetic body, and is formed of, for example, a plate-like metal member such as a silicon steel plate, a soft magnetic steel plate such as an electromagnetic steel plate, or the like. Specifically, the stator 6 is formed by stacking a plurality of the plate-like metal members in the rotation axis direction which is the Z-axis direction.

  The stator 6 is not limited to the case where a plurality of metal members are stacked and formed, and the stator 6 may be integrally formed of one metal member.

  Further, as shown in FIG. 3, the stator 6 has a cylindrical metal member (hereinafter referred to as a core) 6 a and a plurality of teeth 6 b arranged along the circumferential direction of the cylindrical core 6 a. Although six teeth 6 b are shown in FIG. 3, the number of teeth 6 b may be three, nine, or more as long as there are teeth 6 b corresponding to each phase of three-phase alternating current (U phase, V phase, W phase). It may be The core 6a is formed of a known metal material. As a metal member, magnetic bodies, such as iron, etc. are mentioned.

  Moreover, although the insulating film 30 (refer FIG. 5) is provided in the inner peripheral part of the stator 6, the detail of the insulating film 30 is later mentioned using FIG.

  The insulator 7 a is a cylindrical insulating member, and is formed of, for example, an insulating material such as a resin, and provided on the stator 6. Specifically, insulator 7a is provided at a position covering the end surface of stator 6 in the positive Z-axis direction. More specifically, the insulator 7a is provided at a position covering the end faces of the core 6a and the plurality of teeth 6b. Further, the end surface of the stator 6 in the negative Z-axis direction is covered with an insulating film 30 described later.

  An adhesive (for example, varnish) not shown is provided between the insulator 7 a and the stator 6. Thereby, the insulator 7 a is fixed to the stator 6.

  The coil 10 is formed of a conducting wire and surrounds the teeth 6b with the insulator 7a interposed therebetween. Further, the ends of the conductive wires constituting the coil 10 are electrically connected to the external terminal 4 and the internal terminal 5.

  As shown in FIG. 3, the rotor 8 is a rotating body in the motor 1 and includes a yoke 8 a and a magnet 8 b. The rotor 8 is a so-called inner rotor type provided on the inner circumferential portion of the stator 6. The rotor 8 is not limited to the inner rotor type, and may be a so-called outer rotor type provided along the outer peripheral portion of the stator 6.

  The yoke 8 a has a through hole through which the rotation shaft 2 passes, and is fixed to the rotation shaft 2 at a position concentric with the rotation shaft 2. The magnet 8 b is a cylindrical permanent magnet, the inner peripheral surface of the magnet 8 b is fixed to the outer peripheral surface of the yoke 8 a, and the outer peripheral surface of the magnet 8 b faces the inner peripheral portion of the stator 6. Further, in the radial direction of the motor 1, a magnetic gap is formed between the magnet 8b and the teeth 6b. Thus, the rotor 8 is rotated by the magnetic field generated by the teeth 6 b.

  Here, a conventional motor will be described. In the conventional motor, there is a gap between two adjacent coils in the circumferential direction, and the heat of the coil is dissipated by transmitting the heat to the air and insulator of the gap.

  However, for example, in an environment where the motor requires high torque and the temperature around the motor becomes high (for example, in the engine room), it is necessary to efficiently dissipate the heat of the coil to the outside of the motor. In the conventional configuration, it can not be said that heat is efficiently exhausted.

  Therefore, as shown in FIGS. 2 and 3, the motor 1 according to the embodiment includes a plurality of resin members (first resin member 51 and second resin) provided in a gap formed between two adjacent coils 10. A member 52).

  For the first resin member 51 and the second resin member 52, various resin materials such as nylon resin can be used, for example. The first resin member 51 and the second resin member 52 may be the same resin material, or may be different resin materials.

  In addition, each of the first resin member 51 and the second resin member 52 may be made of one type of resin material, may be made of a plurality of resin materials, or other resin material such as a metal material. It may be a composite material including a material. Further, it is more preferable that the first resin member 51 and the second resin member 52 have a thermal conductivity higher than that of air, and further higher than that of the insulator 7a.

  Further, as shown in FIG. 3, the first resin member 51 includes a base 51 a and a projecting portion 51 b, the details of which will be described later, and the projecting portion 51 b is disposed substantially at the center between two adjacent coils 10. Be done. In addition, the second resin member 52 is disposed between the coil 10 and the protrusion 51 b.

  More specifically, the first resin member 51 is a solid member molded in advance by the manufacturing stage, and the protrusion 51b is inserted into the stator 6 from the negative Z-axis direction and mounted. The second resin member 52 is a flowable member at the manufacturing stage, and in the state where the first resin member 51 is mounted on the stator 6, the flowable member is poured from the Z-axis positive direction side, and then the heat is applied. Or the like, or left standing for a predetermined period of time to cure by a known means such as passing a solvent present in the fluid member.

  As described above, since the space formed between the coils 10 is filled with the first resin member 51 (the protrusion 51 b) and the second resin member 52, the heat of the coil 10 is transmitted through the resin member to be exhausted. . That is, the heat conductivity from the coil 10 to the air gap can be improved by replacing the air gap between the coils 10 with air to make the resin member (the heat conductivity is higher than that of air). In other words, the heat exhaust efficiency is improved by further including the first resin member 51 and the second resin member 52 for exhaust heat in a state in which the heat of the coil 10 is easily exhausted by the insulator 7a and air. Can.

  Therefore, according to the motor 1 according to the embodiment, the heat of the coil 10 can be efficiently exhausted. Furthermore, since the number of turns of the coil 10 can be increased and the volume of the magnet 8 b can be reduced by improving the exhaust heat efficiency, the product cost of the motor 1 can be reduced. Hereinafter, the first resin member 51 and the second resin member 52 will be described in detail.

  First, the first resin member 51 will be described in detail with reference to FIGS. 4A to 5. FIG. 4A is a perspective view of the first resin member 51 according to the embodiment. FIG. 4B is a bottom view of the motor 1 according to the embodiment. FIG. 5 is a cross-sectional view of the motor 1 according to the embodiment. In FIG. 4B, a bottom view of the state in which the first resin member 51 is mounted on the stator 6 is shown, and a part of the configuration of the motor 1 is omitted from the viewpoint of easy viewing. 5 shows a cross-sectional view taken along the line B-B in FIG.

  As shown to FIG. 4A, the 1st resin member 51 is provided with the cyclic | annular base 51a and the some protrusion part 51b. For example, after the first resin member 51 pours a fluid resin member into a mold member having a shape of the first resin member 51 before manufacturing the motor 1, the resin member is cured in advance. It can be manufactured. The base 51a and the projecting portion 51b may be integrally formed or may be formed by connecting different members.

  The base 51a is disposed at the end of the teeth 6b (see FIG. 3) in the negative Z-axis direction. Specifically, the base 51 a contacts the end surface of the stator 6 in the negative Z-axis direction. Moreover, as shown to FIG. 4A, the space 51c is formed by the base 51a being separated by the protrusion part 51b adjacent to the circumferential direction. Moreover, the base 51a is arrange | positioned facing the edge part of the teeth 6b in the axial direction.

  A part of the coil 10 enters the space 51c. Specifically, a portion of the coil 10 that protrudes from the stator 6 in the negative Z-axis direction enters the space 51c. As described above, by providing the space 51c, it is possible to prevent the protruding part of the coil 10 from coming into contact with the base 51a, so that the coil 10 can be prevented from being broken.

  Moreover, as shown to FIG. 4A, the protrusion part 51b protrudes in the axial direction which is a Z-axis positive direction side from the base 51a. Moreover, although the protrusion part 51b contacts two adjacent teeth 6b, this point is mentioned later by FIG.

  Moreover, as shown to FIG. 4A, the protrusion part 51b has the nail | claw part 51ba in the edge part at the side of the Z-axis positive direction which is the opposite side to the base 51a. More specifically, the claws 51 ba are formed to face the outer peripheral side. The claw portion 51 ba will be described later with reference to FIG.

  Further, as shown in FIG. 4B, when the first resin member 51 is attached to the stator 6, a part of the opening of the stator 6 is closed by the first resin member 51. Specifically, the base 51a of the first resin member 51 blocks the opening between the two adjacent teeth 6b. Thereby, it is possible to prevent the leakage to the outside even when the second resin member 52 is poured in during manufacturing. The rotation shaft 2 and the rotor 8 pass through the central hole of the first resin member 51.

  Moreover, as shown to FIG. 4B, the space 51c formed between the two adjacent protrusion parts 51b respond | corresponds to the position of the teeth 6b and the coil 10, As mentioned above, a part of coil 10 is arrange | positioned. .

  Next, as shown in FIG. 5, when the first resin member 51 is mounted on the stator 6, the first resin member 51 is supported by the insulator 7a. Specifically, the first resin member 51 is supported by the claw portion 51ba of the protrusion 51b being fitted in the groove 7ab of the insulator 7a.

  More specifically, when mounting the first resin member 51 on the stator 6, the claws 51ba are moved from the negative direction of the Z-axis to the positive direction of the Z-axis while rubbing the protrusions 51b on the inner peripheral surface of the stator 6. It fits by adjusting to the height position of groove part 7ab. Thus, the first resin member 51 can be prevented from slipping off in the negative Z-axis direction and disengaging from the stator 6, so that the second resin member 52 can be reliably prevented from leaking.

  Further, the groove 7 ab of the insulator 7 a is formed on a protrusion 7 aa that protrudes along the inner peripheral surface of the stator 6. As a result, the protrusion 51b can be prevented from jumping out of the stator 6 in the positive Z-axis direction, so that the height position of the lid 3b and the like can be prevented from being restricted. Furthermore, the presence of the protrusion 7 aa can prevent the position of the insulator 7 a from shifting. Further, as shown in FIG. 5, the insulating film 30 is provided on the side surface of the stator 6.

  Next, the second resin member 52 will be described in detail with reference to FIGS. 6 and 7. 6 and 7 show cross-sectional views of the motor 1 according to the embodiment. 6 shows a part of a cross section taken along the line A-A in FIG. 1, and FIG. 7 shows an enlarged view of the periphery of the coil 10 of FIG.

  Here, as shown in FIG. 6, an insulating film 30 formed by powder coating, for example, an insulating resin member or the like is provided on the side surface of the stator 6. Specifically, insulating film 30 opposes coil 10 among the inner peripheral surfaces of stator 6 other than the surface facing the rotor 8, that is, the inner peripheral surface of core 6a and the side surfaces of teeth 6b. Provided on the side to be That is, each of the plurality of insulating films 30 is provided on each of the side surfaces of the plurality of teeth 6 b in the circumferential direction. As described above, by performing insulation with the film-like insulating film 30, it is possible to secure a relatively large volume for arranging the first resin member 51 and the second resin member 52.

  And as shown in FIG. 6, the 2nd resin member 52 is provided so that the space | gap between the 1st resin member 51 and the coil 10 may be filled. Specifically, the projection 51b of the first resin member 51 contacts the two adjacent teeth 6b to play a role of a lid so that the second resin member 52 does not flow into the rotor 8.

  More specifically, the protruding portion 51b contacts the tip end portion of the two teeth 6b adjacent to each other at the radially inner end 51bb, which is close to the rotor 8. As a result, the second resin member 52 can be prevented from leaking to the rotor 8 side, and the amount of the second resin member 52 poured can be made relatively large.

  Further, as shown in FIG. 6, in the protrusion 51 b, one end 51 bc on the radially outer side is in contact with a part of the insulating film 30 provided on the inner peripheral surface of the core 6 a. Thereby, the space | gap formed between the adjacent two teeth 6b is parted by two space | gap 100a, 100b.

  Then, the second resin member 52 is poured into each of the divided air gaps 100a and 100b and hardened to fill the air gaps 100a and 100b. In addition, although it is preferable that the 2nd resin member 52 is filled with space | gap 100a, 100b without clearance, some clearances may remain.

  In addition, although the second resin member 52 is cured to fill the gaps 100a and 100b, for example, the second resin member 52 in a solid state may be manufactured in advance and inserted into the gaps 100a and 100b.

  In addition, although one end 51 bc of the protrusion 51 b contacts the insulating film 30 provided on the inner circumferential surface of the core 6 a, the one end 51 bc does not necessarily have to be in contact with the insulating film 30. That is, it is not necessary to divide into two space | gaps 100a and 100b, and the other end 51bb should just be in contact with the teeth 6b, and should be covered.

  Moreover, in the enlarged view of FIG. 7, the conducting wire 10a which forms the coil 10 is shown. As shown in FIG. 7, when the lead 10a is viewed one by one, a void 100c exists between the leads 10a. Therefore, the second resin member 52 is provided also in the air gap 100c by using the second resin member 52 having fluidity.

  That is, the second resin member 52 is provided so as to fill the air gap 100 c between the conducting wires 10 a forming the coil 10. As a result, the surface area of the coil 10 in contact with the second resin member 52 can be increased, so the heat removal efficiency can be further improved.

  As described above, the motor 1 according to the embodiment includes the plurality of teeth 6 b, the plurality of coils 10, and the plurality of resin members (the first resin member 51 and the second resin member 52). The plurality of teeth 6 b are arranged along the circumferential direction. The plurality of coils 10 surround each of the plurality of teeth 6 b. A plurality of resin members (the first resin member 51 and the second resin member 52) are provided in each of the air gaps 100a and 100b formed between two adjacent coils 10. Thus, the air gaps 100a and 100b formed between the two adjacent coils 10 are filled with the resin member, so the heat of the coil 10 is transmitted through the resin member to be exhausted. That is, since the heat conductivity from the coil 10 to the air gaps 100a and 100b can be improved by replacing the air gaps 100a and 100b between the coils 10 with air and using a resin member, the heat of the coil 10 can be efficiently dissipated. Can. Furthermore, since the number of turns of the coil 10 can be increased and the volume of the magnet 8 b can be reduced by improving the exhaust heat efficiency, the product cost of the motor 1 can be reduced.

  In the embodiment described above, the case where the motor 1 is a brushless motor has been described, but the motor 1 may be a known motor such as a brushed motor or a stepping motor.

  Further, in the embodiment described above, the first resin member 51 and the second resin member 52 are provided in the gaps (six locations in FIG. 3) of all the locations formed between two adjacent coils 10, It may be provided at at least one place.

  Moreover, in the embodiment mentioned above, although the insulating film 30 was provided in the side surface of the stator 6, it is not limited to this, For example, you may provide the insulator 7a in the side surface of the stator 6. FIG. This point will be described with reference to FIG.

  FIG. 8 is a cross-sectional view of a motor 1 according to a modification. As shown in FIG. 8, in the motor 1 according to the modification, the insulator 7 a is also provided on the side surface of the stator 6. That is, the insulator 7a is disposed instead of the insulating film 30 described above.

  Specifically, the protrusion 7 aa (see FIG. 5) of the insulator 7 a is provided to extend from the end on the Z-axis positive direction side of the stator 6 to the end on the Z-axis negative direction side. More specifically, the protrusions 7 aa are provided on the inner peripheral surface of the core 6 a of the stator 6 and the side surface of the teeth 6 b that faces the coil 10. An insulator 7 a may be provided on the end surface of the stator 6 in the negative Z-axis direction, and an insulating film 30 may be provided.

  And as shown in FIG. 8, as for the protrusion part 51b, one end 51bc of radial direction outer side contacts with the insulator 7a. Thereby, the space | gap formed between the adjacent two teeth 6b is parted by two space | gap 100a, 100b. Then, the second resin member 52 is poured into each of the divided air gaps 100a and 100b and hardened to fill the air gaps 100a and 100b.

  Further, the present invention is not limited by the above embodiment. What is configured by appropriately combining the above-described constituents is also included in the present invention. Further, further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the above embodiment, and various modifications are possible.

  DESCRIPTION OF SYMBOLS 1 motor 2 rotating shaft 3 frame 4 external terminal 5 internal terminal 6 stator 6a metal member (core) 6b tooth 7a insulator 8 rotor 8a yoke 8b magnet 10 coil 10a conducting wire 30 insulating film 51 1st resin member 51a base 51b protrusion 51ba claw Part 52 Second resin member

Claims (6)

Several teeth arranged along the circumferential direction,
A plurality of coils surrounding each of the plurality of teeth;
And a plurality of resin members provided in respective gaps formed between two adjacent coils. The resin member is
A first resin member in contact with two adjacent teeth,
The motor according to claim 1, further comprising: a second resin member filling a gap between the first resin member and the coil. The second resin member is
The motor according to claim 2, wherein an air gap between the conductive wires forming the coil is filled. The first resin member includes a base and a protrusion.
The base is disposed axially opposite to the end of the teeth,
The motor according to claim 2, wherein the protrusion axially protrudes from the base. A cylindrical metal member and a stator having the plurality of teeth disposed along the circumferential direction of the metal member;
A plurality of insulating members provided on end faces of the plurality of teeth in the axial direction;
The motor according to any one of claims 2 to 4, further comprising: a plurality of insulating films provided on side surfaces of the plurality of teeth in a circumferential direction. The first resin member is
The motor according to claim 5, supported by the insulating member.

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