JP2019062649A - Stator and motor - Google Patents

Abstract

To provide a stator and a motor that can reduce the axial height of the stator.SOLUTION: An annular stator 2 centered on the central axis includes a stator core 21 having an annular core back 211 and a plurality of teeth 212 protruding radially from a core back 211 and disposed so as to be spaced apart in the circumferential direction, a coil 23 wound around the teeth 212, a cover 24 disposed axially above the stator core 21, and an insulating plate 25 axially facing the cover 24 and disposed between the coils 23 adjacent in the circumferential direction, and the cover 24 and the insulating plate 25 are separate members.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a stator and a motor.

  Conventionally, a motor is widely known in which a rotor having a magnet and a shaft is disposed radially outward or radially inward of an annular stator having a coil. And the cover which wired the conducting wire for supplying electric power to the coil of a stator may be arrange | positioned at the one end side of the axial direction of a stator core, and a stator may be comprised. For example, the conventional motor described in Patent Document 1 has an insulating cover that covers one axial end surface of the stator.

JP, 2010-45952, A

  In a stator having coils, insulation between coils adjacent in the circumferential direction is important, and insertion of an insulating member or the like between coils adjacent in the circumferential direction is conventionally performed. And, when the cover is disposed only on one end side in the axial direction of the stator core, it is desirable to reduce the axial height of the stator by providing an insulating member inserted between the coils on the stator core side of the cover. It is preferable from the viewpoint.

  However, in the conventional motor described in Patent Document 1, the lead wire or lead wire of the winding is present between the insulating cover and the winding (coil) of the stator and becomes a hindrance, and is inserted between the coils If the insulating member to be used is provided on the coil side of the insulating cover, there is a problem in that the axial height of the stator becomes higher than necessary.

  The present invention is made in view of the above-mentioned point, and an object of the present invention is to provide the stator and motor which can make the height of the direction of an axis of a stator low.

  An exemplary stator of the present invention is an annular stator centered on a central axis, said stator projecting radially from said annular core back and said core back and being circumferentially spaced apart A stator core having a plurality of teeth, a coil wound on the teeth, a cover disposed axially above the stator core, and a coil axially opposed to the cover and circumferentially adjacent to the coils And the cover and the insulating plate are separate members.

  An exemplary motor according to the present invention has a stator of the above configuration, and a rotor that is disposed radially outward of the stator and rotates about a central axis that extends in the vertical direction.

  According to the exemplary stator and motor of the present invention, it is possible to lower the axial height of the stator.

FIG. 1 is a longitudinal sectional view of a motor according to an embodiment of the present invention. FIG. 2 is a perspective view of a stator according to an embodiment of the present invention. FIG. 3 is an exploded perspective view of a stator according to an embodiment of the present invention. FIG. 4 is a top view of the stator. FIG. 5 is a longitudinal end view of the stator. FIG. 6 is a top view of the stator of the first modification. FIG. 7 is a longitudinal end view of a stator according to a second modification. FIG. 8 is a longitudinal end view of a stator according to a third modification. FIG. 9 is a longitudinal end view of a stator according to a fourth modification. FIG. 10 is a longitudinal end view of a stator according to a fifth modification. FIG. 11 is a perspective view of the insulating plate of the stator of the sixth modification. FIG. 12 is a front view seen from the circumferential direction of the insulating plate of the stator of the seventh modified example. FIG. 13 is a front view seen from the circumferential direction of the insulating plate of the stator of the eighth modified example. FIG. 14 is a perspective view of the insulating plate of the stator of the ninth modification.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In this document, the direction in which the rotational axis of the motor extends is simply referred to as “axial direction”, and the direction orthogonal to the rotational axis (direction perpendicular to the axial direction) about the rotational axis of the motor is simply referred to as “radial direction”. The direction along the arc centering on the rotation axis of is simply referred to as "circumferential direction". The central axis of the stator coincides with the rotational axis of the motor. That is, also for the stator, the direction coinciding with the axial direction, radial direction and circumferential direction of the motor in a state of being incorporated into the motor will be simply referred to as “axial direction”, “radial direction” and “circumferential direction”.

  Further, in this document, for convenience of explanation, the axial direction is referred to as the vertical direction, and the vertical direction of FIG. 1 is referred to as the stator, and the shape and positional relationship of each part are described. Note that the definition in the vertical direction does not limit the direction of use of the motor. Further, in this document, a cross-sectional view parallel to the axial direction is referred to as “longitudinal cross-sectional view”, and an end view parallel to the axial direction is referred to as “longitudinal end view”. Also, as used herein, "parallel" and "perpendicular" do not mean strictly parallel and perpendicular, but include approximately parallel and approximately perpendicular.

<1. Schematic configuration of motor>
A schematic configuration of a motor according to an exemplary embodiment of the present invention will be described. FIG. 1 is a longitudinal sectional view of a motor 1 according to an embodiment of the present invention. FIG. 2 is a perspective view of the stator 2 according to the embodiment of the present invention. FIG. 3 is an exploded perspective view of the stator 2 according to the embodiment of the present invention. As shown in FIGS. 1, 2 and 3, the motor 1 has a stator 2 and a rotating portion 3. The motor 1 is an outer rotor type motor.

  The stator 2 has an annular shape centered on the central axis Ca. The stator 2 is an armature of the motor 1. The stator 2 has a stator core 21, an insulator 22, a coil 23 and a cover 24.

  The stator core 21 has an annular shape centered on the central axis Ca. The stator core 21 is formed by laminating a plurality of electromagnetic steel plates in the axial direction. The stator core 21 has a core back 211 and a plurality of teeth 212. The core back 211 has an annular shape centered on the central axis Ca. The plurality of teeth 212 protrude radially outward from the outer circumferential surface of the core back 211 in the radial direction. The plurality of teeth 212 are spaced apart in the circumferential direction.

  The insulator 22 is disposed on the stator core 21. The insulator 22 is provided to surround the outer surface of the tooth 212. The insulator 22 is disposed between the stator core 21 and the coil 23. The insulator 22 is made of, for example, an insulating member such as a synthetic resin.

  The coil 23 is wound around the teeth 212. The coil 23 is formed by winding a conducting wire around the teeth 212 via the insulator 22. The plurality of coils 23 are spaced apart in the circumferential direction.

  The cover 24 is disposed axially above the stator core 21. The cover 24 is annular and centered on the central axis Ca, and has a plate shape. The cover 24 covers the upper side in the axial direction of the coil 23.

  The rotating unit 3 rotates around the central axis Ca. The rotating unit 3 has a shaft 31 and a rotor 32.

  The shaft 31 extends in the axial direction up and down along the central axis Ca. The shaft 31 is a rotating shaft of the motor 1. The shaft 31 is in the shape of a column or a pipe formed of, for example, a metal such as stainless steel. The shaft 31 is inserted into bearings 4 respectively provided on the upper and lower sides in the radial direction of the core back 211 and rotatably supported. The rotating unit 3 rotates around a shaft 31 extending in the vertical direction.

  The rotor 32 is disposed radially outward of the stator 2 and rotates about a central axis Ca extending in the vertical direction. The rotor 32 has a magnet holder 321 and a magnet 322.

  The magnet holder 321 is in the form of a cup whose one end in the axial direction is open. The magnet holder 321 is placed on the stator 2 from the opening side. The magnet holder 321 has a hole 321 a at the center in the radial direction on the other end side in the axial direction. The hole 321a penetrates the magnet holder 321 in the axial direction. The shaft 31 is, for example, press-fit into the hole 321 a and fixed to the magnet holder 321. When the motor 1 is driven, the magnet holder 321 rotates with the shaft 31.

  The magnet 322 is fixed to the inner circumferential surface of the magnet holder 321. The magnets 322 are arranged radially outside the stator 2 at predetermined intervals. The magnet 322 is, for example, a single permanent magnet. An N pole and an S pole are alternately magnetized in the circumferential direction on the radially inner surface of the magnet 322. Instead of a single magnet, a plurality of magnets in which either the N pole or the S pole is magnetized may be used.

  In the motor 1, by supplying power to the coil 23, radial magnetic flux is generated in the teeth 212. A magnetic field formed by the magnetic flux and a magnetic field formed by the magnet 322 act to generate torque in the circumferential direction of the rotor 32. By this torque, the rotary unit 3 rotates around the central axis Ca. When the power supply to the coil 23 is stopped, the rotation of the rotating unit 3 is stopped.

<2. Details of the stator>
FIG. 4 is a top view of the stator 2. FIG. 5 is a longitudinal end view of the stator 2. FIG. 4 shows a state in which the cover 24 is removed. As shown in FIG. 3, FIG. 4 and FIG. 5, the stator 2 further has an insulating plate 25.

  The insulating plate 25 is disposed below the cover 24 in the axial direction. The insulating plate 25 faces the cover 24 in the axial direction. Specifically, the axial direction upper surface of the insulating plate 25 faces the axial direction lower surface of the cover 24. The number of insulating plates 25 is the same as that of the coils 23. The plurality of insulating plates 25 are arranged at intervals in the circumferential direction. The insulating plate 25 is a plate extending along the axial direction and the radial direction. The insulating plate 25 is disposed between the coils 23 adjacent in the circumferential direction.

  The cover 24 and the insulating plate 25 are separate from each other. That is, the cover 24 and the insulating plate 25 are respectively formed of different members. Thus, a gap can be provided between the cover 24 and the insulating plate 25. That is, for example, even when a member such as the lead wire of the coil 23 is disposed on the lower surface side of the cover 24 in the axial direction, the insulating plate 25 can be provided below the cover 24 in the axial direction. Therefore, it is possible to lower the axial height of the stator 2. Furthermore, the cover 24 can suppress the displacement of the insulating plate 25 upward in the axial direction.

<3. Modified example>
<3-1. First Modification of Stator>
FIG. 6 is a top view of the stator 2 of the first modification. 6 shows a state in which the cover 24 is removed. As shown in FIG. 6, the stator 2 has an insulating plate 25. Further, as described above, the stator 2 has the insulator 22 disposed between the stator core 21 and the coil 23.

  The insulating plate 25 has a fixing portion 25a at one end in the radial direction. The fixing portion 25 a has, for example, a pin (not shown) extending along the axial direction, and is inserted into a hole (not shown) provided in the insulator 22. Thereby, the insulating plate 25 is fixed to the insulator 22.

  The insulating plate 25 is fixed to at least one of the end of the insulator 22 radially inward of the coil 23 and the end of the insulator 22 radially outward of the coil 23. In the present embodiment, the fixing portion 25 a is provided at the radial inner end of the insulating plate 25, and the insulating plate 25 is fixed at the radial inner end of the insulator 22 than the coil 23. The fixing portion 25 a may be provided at the radial outer end of the insulating plate 25, and the insulating plate 25 may be fixed at the radial outer end of the insulator 22 than the coil 23. Thereby, the insulating plate 25 can be fixed to the stator 2.

<3-2. Second Modification of Stator>
FIG. 7 is a longitudinal end view of the stator 2 of the second modification. As shown in FIG. 7, the insulating plate 25 contacts the axial lower surface of the cover 24. Specifically, the axial direction upper surface of the insulating plate 25 contacts the axial direction lower surface of the cover 24. This makes it possible to enhance the effect of suppressing the displacement of the insulating plate 25 upward in the axial direction.

<3-3. Third Modified Example of Stator>
FIG. 8 is a longitudinal end view of the stator 2 of the third modification. As shown in FIG. 8, the insulating plate 25 is disposed below the cover 24 in the axial direction. The insulating plate 25 is axially opposed to the cover 24 and axially separated. The height of the upper end in the axial direction of the insulating plate 25 in the axial direction coincides with the height of the upper end in the axial direction of the coil 23 in the axial direction. Thus, the axial upper end portion of the coil 23 can be insulated without increasing the axial height of the upper end in the axial direction of the insulating plate 25 more than necessary. Therefore, it is possible to lower the axial height of the stator 2 while securing insulation between the coils 23 adjacent in the circumferential direction.

<3-4. Fourth Modification of Stator>
FIG. 9 is a longitudinal end view of a stator 2 according to a fourth modification. As shown in FIG. 9, the insulating plate 25 contacts the circumferential end of each of the coils 23 adjacent in the circumferential direction. Thus, the insulating plate 25 can be sandwiched by the coils 23 adjacent in the circumferential direction. Therefore, the insulating plate 25 can be fixed between the coils 23 adjacent in the circumferential direction.

<3-5. Fifth Modification of Stator>
FIG. 10 is a longitudinal end view of the stator 2 of the fifth modification. As shown in FIG. 10, the insulating plate 25 has a slope which is tapered downward in the axial direction. In the insulating plate 25, a flat portion 25 b extending in the radial direction opposite to the circumferential direction is inclined in the axial direction. In the present embodiment, the inclination of the insulating plate 25 is a so-called taper in which the two flat portions 25b are inclined symmetrically with respect to the central portion in the circumferential direction, but even if only one flat portion 25b is inclined. good. This makes it possible to easily insert the insulating plate 25 between the coils 23 adjacent in the circumferential direction.

<3-6. Sixth modified example of stator>
FIG. 11 is a perspective view of insulating plate 25 of stator 2 of the sixth modification. As shown in FIG. 11, the insulating plate 25 has a rib 25c.

  The rib portion 25c is provided on a flat portion 25b of the insulating plate 25 which extends in the radial direction to be opposed to the circumferential direction. The rib portion 25c protrudes from the flat portion 25b in the circumferential direction by a predetermined length. The rib portion 25c extends in the axial direction. The rib portion 25 c extends from the upper end in the axial direction of the insulating plate 25 to the lower end in the axial direction. Three rib portions 25c are provided for each of the two flat portions 25b. The rib 25c has a rectangular cross section perpendicular to the axial direction. The arrangement, size, and configuration of the rib portion 25c are not limited to the above-described configuration, and may be another configuration. The strength of the insulating plate 25 can be enhanced by the insulating plate 25 having the rib portion 25 c.

<3-7. Seventh Modification of Stator>
FIG. 12 is a front view seen from the circumferential direction of the insulating plate 25 of the stator 2 of the seventh modification. As shown in FIG. 12, the stator 2 has a conducting wire 26. The insulating plate 25 has a hole 25 d.

  The conducting wire 26 is wired on the lower surface side of the cover 24 in the axial direction. In the present embodiment, the conducting wire 26 is a lead wire. The conducting wire 26 has a resin coating having an insulating function. One end side of the lead 26 extends toward the outside of the stator 2 through the lead portion 241 (see FIG. 3) of the cover 24 and is electrically connected to a power source or the like. Conductors 26 extend between adjacent coils 23. The other end side of the conducting wire 26 is located at the position of the connecting portion 231 (see FIG. 3) of the coil 23 and is electrically connected to the connecting portion 231. That is, the conducting wire 26 is connected to the coil 23. Although three conductors 26 are shown in FIG. 12, the number of conductors 26 is not limited to three. The stator 2 has at least one conductor 26.

  The hole 25 d is disposed at the axial direction upper end of the insulating plate 25. The hole 25 d is recessed downward from the upper end in the axial direction, and penetrates the insulating plate 25 in the circumferential direction. The holes 25 d penetrate the insulating plate 25 from one side to the other side in the circumferential direction of the insulating plate 25. The hole 25d may extend in a radial direction. The hole 25 d is rectangular when viewed from the circumferential direction. The hole 25d may have, for example, a circular shape or another shape. Then, the conducting wire 26 is passed through the hole 25 d. Thus, the insulating plate 25 can be provided on the lower surface in the axial direction of the cover 24 without avoiding the conducting wire 26 wired on the lower surface side in the axial direction of the cover 24. Therefore, the axial height of the stator 2 can be reduced. Moreover, it is possible to wire the conducting wire 26 extended between the adjacent coils 23 at a desired position. Furthermore, when the conducting wire 26 is wired, it is not necessary to avoid the insulating plate 25, and the freedom of wiring the conducting wire 26 can be secured.

  In addition, the same number of holes 25 d as the number of the conducting wires 26 wired at the position of the insulating plate 25 is provided in one insulating plate 25. For example, when the three conducting wires 26 are wired at the position of the insulating plate 25, the insulating plate 25 has three holes 25 d. That is, the hole 25 d accommodates one lead 26. Thereby, the plurality of conducting wires 26 can be individually wired to the holes 25 d. Accordingly, it is possible to wire each of the conductors 26 at a desired position.

  Although not shown, one hole 25 d may be provided in one insulating plate 25 regardless of the number of the conductive wires 26 wired at the position of the insulating plate 25. For example, when three conducting wires 26 are wired at the position of the insulating plate 25, the insulating plate 25 may have one hole 25d. That is, the hole 25 d may be configured to accommodate a plurality of conducting wires 26. Thereby, the several conducting wire 26 can be wired using one hole 25d. Therefore, the hole 25 d can be easily formed.

  Further, the hole 25 d for accommodating one conducting wire 26 and the hole 25 d for accommodating two conducting wires 26 may be provided in one insulating plate 25.

<3-8. Eighth Modification of Stator>
FIG. 13 is a front view seen from the circumferential direction of the insulating plate 25 of the stator 2 of the eighth modified example. As shown in FIG. 13, one hole 25 d is provided in one insulating plate 25 regardless of the number of the conductive wires 26 wired at the position of the insulating plate 25. The hole 25d is open at one end in the radial direction. Either the radially outer side or the radially inner side of the hole 25 d may be opened. Thereby, the hole 25 d can insert the conducting wire 26 from the radial end via the opening. Therefore, the wires 26 can be easily wired.

<3-9. Ninth modified example of stator>
FIG. 14 is a front view seen from the circumferential direction of the insulating plate 25 of the stator 2 of the ninth modification. As shown in FIG. 14, the stator 2 has a connecting member 27.

  The connection member 27 has an annular shape centered on the central axis Ca. The connection member 27 is disposed axially above the plurality of insulating plates 25. The connection member 27 is disposed adjacent to the insulator 22.

  The connecting member 27 connects one end side of each of the plurality of insulating plates 25 in the radial direction. In the present embodiment, the connecting member 27 connects the radially inner end portions of the plurality of insulating plates 25. The connection member 27 may connect the radially outer end of each of the plurality of insulating plates 25. Furthermore, the connection member 27 may be disposed below each of the plurality of insulating plates 25 in the axial direction. Thus, the plurality of insulating plates 25 can be inserted simultaneously between the adjacent coils 23. Therefore, the plurality of insulating plates 25 can be easily inserted between the adjacent coils 23.

  The motor 1 includes the stator 2 shown as the embodiment and the modification thereof, and a rotor 32 which is disposed radially outward of the stator 2 and rotates around a central axis Ca extending in the vertical direction. As a result, it is possible to lower the axial height of the motor 1.

<4. Other>
The embodiment of the present invention has been described above, but the scope of the present invention is not limited to this, and various modifications can be made without departing from the scope of the invention. In addition, the above-described embodiment and the modifications thereof can be arbitrarily combined arbitrarily.

  The present invention is applicable to, for example, a stator and a motor. The structure according to the stator of the present invention is applicable to, for example, a compressor mounted on a refrigerator or the like.

DESCRIPTION OF SYMBOLS 1 ... Motor 2, 2 ... Stator, 3 ... Rotation part, 4 ... Bearing, 21 ... Stator core, 22 ... Insulator, 23 ... Coil, 24 ... Cover, 25 ... Insulating plate, 25a ... fixed part, 25b ... flat part, 25c ... rib part, 25d ... hole part, 26 ... conducting wire, 27 ... connecting member, 31 ... · · · · · · · · Shaft · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · shaft, 32 rotor, 211 coreback 212 teeth 231 connection portion , 322 ... Magnet, Ca ... Central axis

Claims (11)

An annular stator centered on the central axis,
The stator is
A stator core having an annular core back and a plurality of teeth protruding radially from the core back and spaced apart in the circumferential direction;
A coil wound on the teeth,
A cover disposed axially above the stator core;
An insulating plate disposed between the coils axially opposed to the cover and circumferentially adjacent to each other;
Have
The stator which is a separate body from the cover and the insulating plate. An insulator disposed between the stator core and the coil;
The stator according to claim 1, wherein the insulating plate is fixed to at least one of an end of the insulator radially inward of the coil and an end of the insulator radially outward of the coil. The stator according to claim 1, wherein the insulating plate contacts an axial lower surface of the cover. The stator according to any one of claims 1 to 3, wherein the axial height of the upper end in the axial direction of the insulating plate coincides with the height in the axial direction of the upper end in the axial direction of the coil. The stator according to any one of claims 1 to 4, wherein the insulating plate contacts circumferential end portions of the respective coils adjacent in the circumferential direction. The stator according to any one of claims 1 to 5, wherein the insulating plate has an inclination which is tapered downward in the axial direction. The stator according to any one of claims 1 to 6, wherein the insulating plate has an axially extending rib portion. The stator has at least one wire connected to the coil,
The insulating plate has a hole at the upper end in the axial direction that penetrates the insulating plate in the circumferential direction,
The stator according to any one of claims 1 to 7, wherein the conducting wire is passed through the hole. The stator according to claim 8, wherein one end of the hole in the radial direction is open. The stator according to any one of claims 1 to 9, further comprising a connecting member for connecting one end side in the radial direction of each of the plurality of insulating plates. The stator according to any one of claims 1 to 10.
A rotor disposed radially outward of the stator and rotating about a central axis extending in the vertical direction;
With a motor.

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