JP2019062648A - Stator and motor - Google Patents

Abstract

To provide a stator and a motor capable of lowering the axial height of the stator.SOLUTION: An annular stator centered on the central axis includes a stator core having an annular core back and multiple teeth projecting in the radial direction from the annular core back, and arranged in the hoop direction at intervals, a coil wound around the teeth, a cover 24 placed above the stator core in the axial direction, and at least one conductor 25 for connection with the coil. The cover 24 has a tabular part 241 spreading radially for the medial axis, and multiple rib parts 242 extending axially downward from the undersurface of the tabular part 241 in the axial direction, and inserted between coils adjoining in the hoop direction. At least one rib part 242 is recessed downward from the upper end in the axial direction, and has a hole penetrating in the hoop direction, and the conductor 25 is passed through the hole.SELECTED DRAWING: Figure 5

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 around the teeth, a cover disposed axially above the stator core, and at least one conducting wire connected to the coil, the cover comprising A plate-like portion radially extending with respect to a central axis; and a plurality of rib portions extending axially downward from the lower surface of the plate-like portion in the axial direction and inserted between the adjacent coils in the circumferential direction. And at least one of the rib portions has a hole which is recessed downward from the upper end in the axial direction and which penetrates in the circumferential direction, and the wire is passed through the hole.

  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 cross-sectional view of the stator. FIG. 5 is a perspective view of the cover as viewed from below. FIG. 6 is a cross-sectional view of the cover. FIG. 7 is a front view seen from the circumferential direction of the rib portion of the cover. FIG. 8 is a front view as viewed from the circumferential direction of the rib portion of the stator of the first modified example. FIG. 9 is a front view as viewed from the circumferential direction of the rib portion of the stator of the second modified example. FIG. 10 is a front view seen from the circumferential direction of the rib portion of the stator of the third modified example. FIG. 11 is a front view as viewed from the circumferential direction of the rib portion of the stator of the fourth modified example. FIG. 12 is a longitudinal end view of a stator according to a fifth modification. FIG. 13 is a longitudinal end view of a stator according to a sixth modification. FIG. 14 is a perspective view of a rib portion of a stator according to a seventh modification. FIG. 15 is a bottom view of the stator of the eighth modification. FIG. 16 is a partial longitudinal cross-sectional view of a stator according to an eighth modification. FIG. 17 is a transverse sectional view of a stator according to a ninth modification. FIG. 18 is a front view of the rib portion of the stator of the ninth modification as viewed from the circumferential direction.

  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. Furthermore, in this document, a cross-sectional view parallel to the axial direction is referred to as "longitudinal cross-sectional view", a cross-sectional view perpendicular to the axial direction is referred to as "transverse cross-sectional view", and an end face parallel to the axial direction is "longitudinal end view" Call it 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, a cover 24, and a conducting wire 25.

  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 coil 23 has a connecting portion 231 at the radially outer end. The connection portion 231 extends upward in the axial direction. The connection portion 231 is in contact with a conductor 25 described later or a conducting portion 244 and is electrically connected.

  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 cross-sectional view of the stator 2. FIG. 5 is a perspective view of the cover 24 as viewed from below. FIG. 6 is a cross-sectional view of the cover 24. As shown in FIG. As shown in FIGS. 4, 5 and 6, the cover 24 has a plate-like portion 241 and a rib portion 242. The stator 2 further has a conductor 25.

  The plate-like portion 241 spreads in the radial direction with respect to the central axis Ca. The plate-like portion 241 has an annular shape centered on the central axis Ca, and has an opening 241 a located radially outward of the central axis Ca. Moreover, the plate-like part 241 has a lead-out part 241 b. The lead-out portion 241 b is disposed on the outer peripheral portion in the radial direction on the axial direction upper surface of the plate portion 241. The conducting wire 25 is passed through the lead portion 241b.

  The conducting wire 25 is wired on the lower surface side of the plate-like portion 241 in the axial direction. In the present embodiment, the conducting wire 25 is a lead wire. The conducting wire 25 has a coating made of a resin having an insulating function. A terminal 251 is provided at one end of the conducting wire 25. The other end side of the conducting wire 25 extends to the outside of the stator 2 through the lead portion 241 b and is electrically connected to a power supply source or the like. Conductors 25 extend between adjacent coils 23. The terminal 251 is located at the position of the connection portion 231 of the coil 23. The terminal 251 is in contact with the connection portion 231 and is electrically connected. That is, the conducting wire 25 is connected to the coil 23. In addition, in FIG.5 and FIG.6, although the conducting wire 25 shall be three, the conducting wire 25 is not necessarily limited to three. The stator 2 has at least one conductor 25.

  The rib portions 242 are provided in the same number as the coils 23. The plurality of rib portions 242 are spaced apart in the circumferential direction. The rib portion 242 extends axially downward from the lower surface of the plate portion 241 in the axial direction. The rib portion 242 has a plate shape extending in the axial direction and the radial direction. The rib portion 242 is inserted between the coils 23 adjacent in the circumferential direction.

<3. Details of rib section>
FIG. 7 is a front view of the rib portion 242 of the cover 24 as viewed from the circumferential direction. As shown in FIGS. 5, 6 and 7, the rib 242 of the cover 24 has a hole 242a. Note that at least one rib portion 242 has a hole portion 242a. In the present embodiment, for example, four rib portions 242 have holes 242 a. Depending on the wiring of the conducting wire 25, which rib portion 242 is to be provided with the hole portion 242 a can be determined arbitrarily.

  The hole portion 242 a is disposed at the axial direction upper end of the rib portion 242. The hole 242 a is recessed downward from the upper end in the axial direction and penetrates in the circumferential direction. The hole portion 242 a passes through the rib portion 242 from one side to the other side in the circumferential direction of the rib portion 242. The hole 242a may extend in a radial direction. The hole 242a is rectangular when viewed from the circumferential direction. The hole 242a may have, for example, a circular shape or another shape. Then, the conducting wire 25 is passed through the hole 242a. Accordingly, the rib portion 242 can be provided on the lower surface in the axial direction of the plate portion 241 without avoiding the conducting wire 25 wired on the lower surface side in the axial direction of the plate portion 241. Therefore, the axial height of the stator 2 can be reduced. Moreover, it is possible to wire the conducting wire 25 extended between the adjacent coils 23 at a desired position. Furthermore, when the conducting wire 25 is wired, there is no need to avoid the rib portion 242, and the freedom of wiring the conducting wire 25 can be secured.

  The same number of holes 242 a as the number of the conducting wires 25 wired at the position of the rib portion 242 is provided in one rib portion 242. For example, when the three conducting wires 25 are wired at the position of the rib portion 242, the rib portion 242 has three holes 242a. That is, the hole 242 a accommodates one of the conducting wires 25. Thereby, the plurality of conducting wires 25 can be individually wired to the holes 242 a. Therefore, it is possible to wire each conducting wire 25 in a desired position.

<4. Modified example>
<4-1. First Modification of Stator>
FIG. 8 is a front view seen from the circumferential direction of the rib portion 242 of the stator 2 of the first modified example. As shown in FIG. 8, one hole portion 242 a is provided in one rib portion 242 regardless of the number of the conductive wires 25 wired at the position of the rib portion 242. For example, when three conducting wires 25 are wired at the position of the rib portion 242, the rib portion 242 has one hole portion 242a. That is, the hole 242 a accommodates the plurality of conducting wires 25. Thereby, a plurality of conducting wires 25 can be wired using one hole 242a. Thus, the hole 242a can be easily formed.

  Note that the configuration shown in FIG. 7 may be combined with the configuration shown in FIG. That is, one rib portion 242 may be provided with a hole portion 242 a for accommodating one lead wire 25 and a hole portion 242 a for accommodating two lead wires 25.

<4-2. Second Modification of Stator>
FIG. 9 is a front view as viewed from the circumferential direction of the rib portion 242 of the stator 2 of the second modified example. As shown in FIG. 9, one hole portion 242 a is provided in one rib portion 242 regardless of the number of the conductive wires 25 wired at the position of the rib portion 242. The hole 242 a is open at one end in the radial direction. The hole 242 a may be opened either radially outward or radially inward. Thereby, the hole part 242a can insert the conducting wire 25 from the radial direction end side through the opening. Therefore, the wires 25 can be easily wired.

<4-3. Third Modified Example of Stator>
FIG. 10 is a front view seen from the circumferential direction of the rib portion 242 of the stator 2 of the third modified example. As shown in FIG. 10, the hole 242 a is provided in one rib 242 in the same number as the number of the conducting wires 25 wired at the position of the rib 242. That is, three holes 242 a are provided in one rib 242 and accommodate one lead 25 individually. The hole 242 a may be configured to accommodate a plurality of conducting wires 25. And the conducting wire 25 contacts the inner surface of the axial direction lower part of the hole 242a. In the present embodiment, the hole 242a is rectangular, but contacts the inner surface in the axial direction of the hole 242a similarly even if it has another shape such as, for example, a circular shape. Thereby, the conducting wire 25 can be positioned in the axial direction.

<4-4. Fourth Modification of Stator>
FIG. 11 is a front view seen from the circumferential direction of the rib portion 242 of the stator 2 of the fourth modified example. As shown in FIG. 11, the same number of hole portions 242 a as the number of conducting wires 25 wired at the position of the rib portion 242 is provided in one rib portion 242. That is, three holes 242 a are provided in one rib 242 and accommodate one lead 25 individually. And the conducting wire 25 contacts the axial direction lower part of the hole 242a, and the inner surface of radial direction. In the present embodiment, the hole 242a is rectangular, but it may be in contact with the lower surface in the axial direction of the hole 242a and the inner surface in the radial direction, even if it has another shape such as a circle. Thereby, the conducting wire 25 can be positioned in the axial direction and the radial direction. Then, the conducting wire 25 can be fixed at the hole 242 a.

<4-5. Fifth Modification of Stator>
FIG. 12 is a longitudinal end view of the stator 2 of the fifth modification. As shown in FIG. 12, the rib portion 242 of the cover 24 contacts the circumferential end of each of the coils 23 adjacent in the circumferential direction. Thereby, the rib part 242 can be pinched | interposed with the coil 23 adjacent to the circumferential direction. Therefore, the rib portion 242 can be fixed between the coils 23 adjacent in the circumferential direction.

<4-6. Sixth modified example of stator>
FIG. 13 is a longitudinal end view of a stator 2 according to a sixth modification. As shown in FIG. 13, the rib portion 242 of the cover 24 has a slope that tapers axially downward. In the rib portion 242, a flat portion 242b extending in the radial direction opposite to the circumferential direction is inclined in the axial direction. In the present embodiment, the inclination of the rib portion 242 is a so-called taper in which the two flat portions 242b are inclined symmetrically with respect to the central portion in the circumferential direction, but even if only one flat portion 242b is inclined. good. This makes it possible to easily insert the rib portion 242 between the coils 23 adjacent in the circumferential direction.

4-7. Seventh Modification of Stator>
FIG. 14 is a perspective view of the rib portion 242 of the stator 2 of the seventh modification. As shown in FIG. 14, the rib portion 242 of the cover 24 has a second rib portion 242 c.

  The second rib portion 242 c is provided on a flat portion 242 b of the rib portion 242 that extends in the radial direction to face the circumferential direction. The second rib portion 242c protrudes from the flat portion 242b in the circumferential direction by a predetermined length. The second rib portion 242c extends in the axial direction. The second rib portion 242 c extends from the upper end in the axial direction of the rib portion 242 to the lower end in the axial direction. Three second rib portions 242c are provided for each of the two flat portions 242b. The second rib portion 242 c has a rectangular cross section perpendicular to the axial direction. The arrangement, size, and configuration of the second rib portion 242c are not limited to the above-described configuration, and may be other configurations. Since the rib portion 242 includes the second rib portion 242c, the strength of the rib portion 242 can be increased.

4-8. Eighth Modification of Stator>
FIG. 15 is a bottom view of the stator 2 of the eighth modification. FIG. 16 is a partial longitudinal sectional view of a stator 2 according to an eighth modification. As shown in FIG. 15 and FIG. 16, the cover 24 has a sandwiching portion 243.

  The holding portion 243 is formed on the lower surface of the plate-like portion 241 of the cover 24 in the axial direction. The holding portion 243 is disposed between the rib portions 242 adjacent in the circumferential direction. The holding portion 243 has a protrusion 243 a and an opening 243 b.

  The protrusion 243 a protrudes axially downward from the lower surface in the axial direction of the plate portion 241. Two protrusion parts 243 a are provided for one holding part 243. The two protrusions 243 a are disposed at positions facing each other across the wire 25. The lower part in the axial direction of the protrusion 243 a is bent toward the conducting wire 25, and the tip end is located below the conducting wire 25 in the axial direction.

  The opening 243 b is disposed at the position of the conducting wire 25 between the two opposing protrusions 243 a. The opening 243 b penetrates the plate-like portion 241 along the axial direction.

  With the above configuration, the holding unit 243 holds the conducting wire 25. More specifically, the sandwiching portion 243 sandwiches the conducting wire 25 between the two projecting portions 243 a and the lower surface in the axial direction of the plate portion 241 by the two projecting portions 243 a facing each other. Thereby, the conducting wire 25 can be positioned between the rib portions 242 adjacent in the circumferential direction. And it is possible to control that lead 25 bends in the direction of an axis below, ie, coil 23, side.

<4-9. Ninth modified example of stator>
FIG. 17 is a cross-sectional view of the stator 2 of the ninth modification. FIG. 18 is a front view as viewed from the circumferential direction of the rib portion 242 of the stator 2 of the ninth modification. As shown in FIGS. 17 and 18, the cover 24 has a conducting portion 244.

  The conductive portion 244 is disposed on the lower surface side of the cover 24 in the axial direction. The conducting portion 244 is accommodated in the hole portion 242 a of the rib portion 242 intersecting with the conducting portion 224. For example, one end side in the radial direction of the hole 242a is open. The conducting portion 244 is inserted into the hole 242 a from the radial end via the opening. Conducting portion 244 is formed of, for example, an arc-shaped metal plate.

  As described above, the coil 23 shown in FIG. 3 has the connecting portion 231 at the radially outer end. Conduction portion 244 is connected to connection portion 231. The conducting portion 244 is a neutral point in which the three-phase coil 23 is connected. Thus, the conducting portion 244 used as the neutral point of the wire connection of the coil 23 of the motor 1 can be disposed through the rib portion 242. Therefore, it is possible to lower the axial height of the stator 2.

  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.

<5. 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 ... Lead wire, 31 ... Shaft, 32 ... Rotor, 211 ... Core back, 212 ... Tees, 231 ... Connections, 241 ... Plates, 241 a ... Opening , 241b: lead portion, 242: rib portion 242a: hole portion 242b: flat portion 242c: second rib portion 243: pinching portion 243a Protrusion part, 243b ... opening part, 244 ... conduction part, 251 ... terminal, 321 ... magnet holder, 321a ... hole part, 322 ... magnet, Ca ... central axis

Claims (12)

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;
At least one wire connected to the coil;
Have
The cover is
A plate-like portion radially extending with respect to the central axis;
A plurality of ribs extending axially downward from the axially lower surface of the plate-like portion and inserted between the adjacent coils in the circumferential direction;
Have
At least one of the rib portions has a hole which is recessed downward from the upper end in the axial direction and which penetrates in the circumferential direction;
The stator in which the conducting wire is passed through the hole. The stator according to claim 1, wherein the hole accommodates the one lead wire. The stator according to claim 1, wherein the hole accommodates a plurality of the wires. The stator according to any one of claims 1 to 3, wherein the hole is open at one end side in the radial direction. The stator according to any one of claims 1 to 4, wherein the conducting wire contacts an inner surface axially below the hole. The stator according to any one of claims 1 to 4, wherein the conducting wire contacts an axially lower and radial inner surface of the hole. The stator according to any one of claims 1 to 6, wherein the rib portion contacts circumferential end portions of the coils adjacent in the circumferential direction. The stator according to any one of claims 1 to 7, wherein the rib portion has an inclination which is tapered downward in the axial direction. The stator according to any one of claims 1 to 8, wherein the rib portion has a second rib portion extending in an axial direction. On the lower surface in the axial direction of the plate-like portion of the cover, a sandwiching portion disposed between the rib portions adjacent in the circumferential direction is formed;
The stator according to any one of claims 1 to 9, wherein the sandwiching portion sandwiches the conducting wire. Each of the plurality of coils has a connection at its end,
The cover has a conducting portion disposed on the lower side in the axial direction,
The stator according to any one of claims 1 to 10, wherein the conductive portion is accommodated in the hole portion of the rib portion intersecting the conductive portion and connected to the connection portion. The stator according to any one of claims 1 to 11.
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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