JP6662008B2 - Stator, motor, and stator manufacturing method - Google Patents

Description

  The present invention relates to a stator, a motor, and a method for manufacturing a stator.

  2. Description of the Related Art Conventionally, as shown in Patent Document 1, for example, a motor including a so-called Landel type (consequent pole type) structure stator and a rotor having a permanent magnet as a magnetic pole facing the stator in a radial direction is known. . The stator of the Landel type structure uses a pair of annular stator cores having a plurality of claw-shaped magnetic poles in the circumferential direction, and the stator cores of the pair of stator cores are combined so that the claw-shaped magnetic poles are alternately arranged in the circumferential direction. The coil portions are arranged in the axial direction, and the claw-shaped magnetic poles function as mutually different magnetic poles.

  Further, each stator core of the stator has, for example, a core back portion extending in the same direction as the claw-shaped magnetic poles on the opposite side in the radial direction from the claw-shaped magnetic poles of the stator core. By providing this core back portion on the stator core, magnetic saturation is suppressed.

JP 2007-181303 A

  By the way, in the above-described stator, magnetic saturation in the core member (stator core) is suppressed by providing the core back portion, but the components constituting the core member (stator core) including the claw-shaped magnetic poles are complicated. I was

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a stator, a motor, and a method of manufacturing a stator that can simplify the components of a core member.

A stator for solving the above-mentioned problems includes a first core portion having a plurality of claw-shaped magnetic poles extending in a circumferential direction from a disc-shaped core base in a circumferential direction, and a claw extending in an axial direction from the disc-shaped core base. A stator comprising: a second core portion having a plurality of magnetic poles in a circumferential direction; and a coil axially sandwiched by the first core portion and the second core portion, wherein the first and second cores are provided. A core back portion made of a magnetic member and provided separately from the first and second core portions is provided on a radially opposite side of the claw-shaped magnetic pole of the portion, and the first core portion and the second core portion are provided. The concave portion is provided on the side where the core back portion is located in the radial direction on the claw-shaped magnetic pole side, and the core back portion is located in the concave portion .

  According to this configuration, the core back portion made of a magnetic member is provided separately from the first and second core portions on the radially opposite side of the claw-shaped magnetic poles of the first and second core portions. The structure of each component can be simplified as compared with the case where the core back portion is provided on the same component.

According to this configuration, since the core back portion is provided in the concave portion, the core back portion can position the first and second core portions in the circumferential direction.
In the above-described stator, a plurality of stator portions having the first core portion, the second core portion, and the coil are laminated in the axial direction, and a plurality of the stator portions are laminated and sandwiched from both axial sides. It is preferable to have a part.

  According to this configuration, a plurality of stator portions having the first core portion, the second core portion, and the coil are stacked in the axial direction, and the holding portion for holding the plurality of stator portions in a stacked state from both sides in the axial direction is provided. Therefore, the plurality of stator portions can be sandwiched and fixed by the sandwiching portion in a state of being stacked.

  In the above stator, the holding portion is a first holding portion positioned on one side in the axial direction when a plurality of the stator portions are stacked, and a first holding portion positioned on the other side in the axial direction when a plurality of the stator portions are stacked. It is preferable that the core back portion be provided as a part of the connecting portion, comprising: a second holding portion; and a connecting portion connecting between the first holding portion and the second holding portion.

  According to this configuration, the holding portion includes a first holding portion that is located on one side in the axial direction when a plurality of stator portions are stacked, and a first holding portion that is located on the other side in the axial direction when the plurality of stator portions are stacked. A second holding portion, and a connecting portion connecting between the first holding portion and the second holding portion, wherein the core back portion is provided as a part of the connecting portion. That is, by providing the core back portion in the holding portion, the effect of the core back portion can be provided while holding and fixing. In addition, an increase in the number of parts can be suppressed as compared with a case where the holding portion and the core back portion are formed separately.

According to another aspect of the present invention, there is provided a motor including the stator described above.
According to this configuration, it is possible to provide a motor having the same effect as any of the effects described above.

Further, a method of manufacturing a motor that solves the above-described problem includes a first core portion having a plurality of claw-shaped magnetic poles extending in a circumferential direction from a disc-shaped core base in a circumferential direction, and A method of manufacturing a stator, comprising: a second core portion having a plurality of claw-shaped magnetic poles extending in a circumferential direction; and a coil axially held between the first core portion and the second core portion. The first core portion and the second core portion are powder magnetic cores formed by compression molding, and a separate core back portion made of a magnetic member abuts on a side radially opposite to the claw-shaped magnetic pole. The first core portion and the second core portion are provided with a concave portion that is recessed toward the claw-shaped magnetic pole on a side where the core back portion is located in a radial direction, and the core back portion is provided in the concave portion. Is located .

  According to this configuration, the first core portion and the second core portion are powder magnetic cores formed by compression molding, and a separate core back portion made of a magnetic member is on the side opposite to the claw-shaped magnetic pole in the radial direction. At the contact position. For this reason, a core back portion that is separate from the first and second core portions and made of a magnetic member is provided on the opposite side of the claw-shaped magnetic poles of the first and second core portions in the radial direction. The structure of each part can be simplified as compared with the case where the parts are provided on the same part.

  ADVANTAGE OF THE INVENTION According to the stator, the motor, and the manufacturing method of a stator of this invention, the component parts of a core member can be simplified.

FIG. 2 is a cross-sectional view of the motor according to the embodiment. FIG. 3 is an exploded perspective view of the motor of the same embodiment. The exploded perspective view of the stator of the same form. Sectional perspective view of the stator of the same form.

Hereinafter, an embodiment of the motor will be described.
As shown in FIG. 1, the motor M of the present embodiment is a brushless motor, and has a rotor 10 and a stator 20.

As shown in FIGS. 1 and 2, the rotor 10 has a rotor core 11 made of a magnetic material, and magnets 12 and 13 fixed to the rotor core 11.
The rotor core 11 has an inner peripheral cylindrical portion 14 having a cylindrical shape centered on the axis L of the rotor 10 and an outer peripheral portion having a cylindrical shape centered on the axis L and located on an outer peripheral side of the inner cylindrical portion 14. It has a side cylindrical portion 15 and an upper bottom portion 16 connecting one end in the axial direction of the inner cylindrical portion 14 and the outer cylindrical portion 15. The upper bottom part 16 is formed in a flat plate shape perpendicular to the axis L. In the rotor core 11, the inner peripheral surface of the inner peripheral side cylindrical portion 14 is rotatably supported on a support shaft 17 via a bearing 18.

  An A-phase magnet 12 and a B-phase magnet 13 are fixed to the inner peripheral surface of the outer cylindrical portion 15. The magnets 12 and 13 are arranged side by side in the axial direction. The magnet 12 radially opposes a first stator 21 described later, and the magnet 13 radially opposes a second stator 22 described later. Has become. Each of the magnets 12 and 13 is magnetized in the radial direction, and N poles and S poles are alternately arranged at equal intervals in the circumferential direction.

  The stator 20 is fixed to the housing H, and includes an annular first stator portion 21, an annular second stator portion 22, and the first stator portion 21 and the second stator portion 22. And a fixing portion 40 for fixing the fixing portion 40 to the fixing portion.

  The first and second stator portions 21 and 22 have the same configuration and the same shape as each other, and are arranged side by side in the axial direction. The second stator portion 22 is disposed on the upper bottom portion 16 side (upper side in FIGS. 1 and 2) in the axial direction, and the first stator portion 21 is disposed on the axially open end side of the rotor core 11 (in FIGS. Lower).

  In the present embodiment, the first stator section 21 is used for the A phase, and the same current (A phase) is supplied to them. The second stator section 22 is used for the B phase, and the same phase (B phase) drive current is supplied to them.

  As shown in FIGS. 2 and 3, the first and second stator portions 21 and 22 each include a pair of stator cores (a first stator core 23 and a second stator core 24) having the same shape, and a pair of the stator cores 23 and 24. 24, and a winding 25 disposed between them.

  Each of the stator cores 23 and 24 is, for example, a dust core formed by compression molding, and has a cylindrical core base 26 and a plurality (six in the present embodiment) extending from the core base 26. And a claw-shaped magnetic pole. The claw-shaped magnetic poles formed on the first stator core 23 are referred to as first claw-shaped magnetic poles 27, and the claw-shaped magnetic poles formed on the second stator core 24 are referred to as second claw-shaped magnetic poles 28. Each claw-shaped magnetic pole 27, 28 has the same shape as each other. The first claw-shaped magnetic poles 27 are provided at equal intervals (60-degree intervals) in the circumferential direction, and the second claw-shaped magnetic poles 28 are also provided at equal intervals (60-degree intervals) in the circumferential direction.

  Each claw-shaped magnetic pole 27, 28 extends radially outward from the core base 26 and is bent at a right angle so as to face the axial direction. Here, in each of the claw-shaped magnetic poles 27 and 28, a portion extending radially outward from the core base 26 is referred to as a radially extending portion 29, and a tip portion bent in the axial direction is referred to as a magnetic pole portion 30. The radially extending portion 29 is formed such that the circumferential width decreases toward the outer peripheral side. The outer peripheral surface (radially outer surface) of the magnetic pole portion 30 is formed in an arc surface centered on the axis L.

Each of the stator cores 23 and 24 has a recess 23a and 24a that is recessed radially outward on a radially inner side surface.
The first and second stator cores 23 and 24 having the above-described configuration are assembled such that the first and second claw-shaped magnetic poles 27 and 28 (magnetic pole portions 30) face in opposite directions in the axial direction. In this assembled state, the magnetic pole portions 30 of the first claw-shaped magnetic poles 27 and the magnetic pole portions 30 of the second claw-shaped magnetic poles 28 are alternately arranged at equal intervals in the circumferential direction.

  In this assembled state, the winding 25 is interposed between the first and second stator cores 23 and 24 in the axial direction. An insulating member (not shown) is interposed between the winding 25 and the first and second stator cores 23 and 24. The winding 25 has an annular shape along the circumferential direction of the stator 20. The winding 25 is disposed between the radially extending portion 29 of the first claw-shaped magnetic pole 27 and the radially extending portion 29 of the second claw-shaped magnetic pole 28 in the axial direction. Is disposed between the core base 26 of each stator core 23, 24 and the magnetic pole portion 30 of each claw-shaped magnetic pole 27, 28.

  Each of the stator portions 21 and 22 configured as described above has a so-called Lundell type structure. That is, the first and second stator portions 21 and 22 cause the first and second claw-shaped magnetic poles 27 and 28 to be different from each other at each time by the windings 25 arranged between the first and second stator cores 23 and 24. It has a 12-pole Rundel-type structure that excites the magnetic poles.

As shown in FIG. 2, the first and second stator portions 21 and 22 are stacked such that the second stator cores 24 are adjacent to each other in the axial direction.
The arrangement angle of the B-phase second stator section 22 with respect to the A-phase first stator section 21 is shifted by a predetermined angle in a clockwise direction when viewed from the axial upper side (the stator section 21 side). I have. In other words, the magnetic poles (claw-shaped magnetic poles 27, 28) of the second stator portion 22 are shifted clockwise by a predetermined angle with respect to the magnetic poles (claw-shaped magnetic poles 27, 28) of the first stator portion 21. Have been.

  Further, the magnets 12 and 13 on the rotor 10 side radially facing the first and second stator portions 21 and 22 are also configured to be shifted from each other in the circumferential direction. More specifically, when viewed from the upper side in the axial direction (the magnet 13 side), the N-pole (S-pole) of the B-phase magnet 13 is counterclockwise with respect to the N-pole (S-pole) of the A-phase magnet 12. Are arranged so as to be shifted by a predetermined angle.

As shown in FIGS. 1, 2, and 4, each of the stator portions 21 and 22 is sandwiched by the fixing portion 40 and fixed to the housing H in a state of being stacked in the axial direction.
The fixing part 40 has a first fixing part 41 and a second fixing part 42. The first and second fixing portions 41 and 42 include a contact portion 43 that comes into contact with each of the stator portions 21 and 22 in the axial direction, a plurality of core back portions 44, and a plurality of mounting portions 45.

  The contact portions 43 of the first and second fixing portions 41 and 42 are formed so as to form annular plates, respectively. The contact portion 43 of the first fixed portion 41 contacts the core base 26 of the first stator core 23 of the first stator portion 21 in the axial direction, and the contact portion 43 of the second fixed portion 42 is the second contact portion of the second stator portion 22. It comes into contact with the core base 26 of one stator core 23 in the axial direction.

  Each core back portion 44 is formed on each of the first fixing portions 41 and 42 so as to extend in the axial direction from the radial inside. Each of the core back portions 44 is formed such that a cross section cut in a direction perpendicular to the axis forms an arc shape, and each of the core back portions 44 is fitted into the concave portions 23 a and 24 a provided in each of the stator cores 23 and 24. I have.

  The mounting portion 45 is formed to extend radially inward at the distal end side of each core back portion 44. An insertion hole 45a is formed in the attachment portion 45, and can be attached to the attachment portion H1 of the housing H by, for example, a bolt or the like.

Further, the mounting portion 45 is disposed at a boundary position in the axial direction between the first stator portion 21 and the second stator portion 22, that is, at a boundary position of each phase (A phase, B phase).
The fixing portion 40 configured as described above is sandwiched by the contact portions 43 of the first and second fixing portions 41 and 42 in a state where the first and second stator portions 21 and 22 are laminated in the axial direction, and attached. The first and second stator portions 21 and 22 are fixed to the housing H by attaching the portion 45 to the housing H.

Next, the operation of the present embodiment will be described.
An A-phase drive current is supplied to each winding 25 of the first A-phase stator portion 21, and a B-phase drive current is supplied to each winding 25 of the second B-phase stator portion 22. The A-phase drive current and the B-phase drive current are AC currents, and their phase difference is set to, for example, 90 degrees. Then, when the A-phase and B-phase driving currents corresponding to the respective stator sections 21 and 22 are supplied, torque for rotating the magnets 12 and 13 is generated, and the rotor 10 is driven to rotate.

Next, the characteristic effects of the present embodiment will be described.
(1) A core back portion made of a magnetic member that is separate from the first and second stator cores 23 and 24 and is located on the opposite side of the first and second stator cores 23 and 24 in the radial direction from the claw-shaped magnetic poles 27 and 28. Since the 44 is provided, the structure of each component (the stator cores 23 and 24 and the core back portion 44) can be simplified as compared with the case where the core back portion 44 is provided on the same component.

  (2) Since the core back portions 44 are provided in the recesses 23a and 24a of the stator cores 23 and 24, the stator cores 23 and 24 can be positioned in the circumferential direction by the core back portions 44.

  (3) A plurality of stator portions 21 and 22 having the first stator core 23, the second stator core 24, and the windings 25 are stacked in the axial direction, and the plurality of stator portions 21 and 22 are stacked from both sides in the axial direction. Since the fixing portion 40 that forms the holding portion for holding is provided, the fixing portion 40 can hold and fix the plurality of stator portions 21 and 22 in a stacked state.

  (4) The fixing portion 40 is a state in which the abutting portion 43 of the first fixing portion 41 located on one side in the axial direction in a state where the plurality of stator portions 21 and 22 are stacked, and the plurality of stator portions 21 and 22 are stacked. And a contact part 43 of the second fixing part 42 located on the other side in the axial direction, and a core back part 44 and a mounting part 45 as connecting parts for connecting the contact parts 43 to each other. That is, by providing the core back portion 44 as a part of the fixing portion 40, the effect of the core back portion 44 can be imparted while holding and fixing. In addition, an increase in the number of parts can be suppressed as compared with the case where the fixing portion 40 and the core back portion 44 are formed separately.

  (5) Since the mounting portion 45 is disposed at the boundary between the first stator portion 21 and the second stator portion 22, fine adjustment of the circumferential position between the first stator portion 21 and the second stator portion 22 is performed. Is possible.

The above embodiment may be modified as follows.
In the above-described embodiment, the stator 20 is formed by laminating the first stator portion 21 and the second stator portion 22 in the axial direction. However, the number of laminations may be changed as appropriate.

Further, the stator 20 may be constituted by only one of the first stator portion 21 and the second stator portion 22.
-In the above-mentioned embodiment, although fixed part 40 and core back part 44 were formed in one, it may be separate.

  In the above-described embodiment, the recesses 23a and 24a are formed in the stator cores 23 and 24, and the core back portion 44 is fitted into the recesses 23a and 24a. , The concave portions 23a and 24a may be omitted.

  -The said embodiment and each modification may be combined suitably.

  M: motor, 20: stator, 21: first stator portion, 22: second stator portion, 23: first stator core (first core portion), 23a: concave portion, 24: second stator core (second core portion), 24a: concave portion, 25: coil (winding), 26: core base, 27, 28: claw-shaped magnetic pole, 40: fixed portion (holding portion), 43: contact portion (first holding portion and second holding portion) , 44: core back portion (connection portion), 45: mounting portion (connection portion).

Claims (5)

A first core portion having a plurality of claw-shaped magnetic poles extending in the circumferential direction from the disk-shaped core base, and a plurality of claw-shaped magnetic poles extending in the circumferential direction from the disk-shaped core base in the circumferential direction. A stator comprising: a second core portion; and a coil axially sandwiched between the first core portion and the second core portion,
A core back portion made of a magnetic member and provided separately from the first and second core portions is provided on a radially opposite side of the claw-shaped magnetic poles of the first and second core portions ,
The first core portion and the second core portion are provided with concave portions that are recessed on the claw-shaped magnetic pole side on a side where the core back portion is located in a radial direction,
The stator, wherein the core back portion is located in the concave portion . The stator according to claim 1 ,
A plurality of stator portions each including the first core portion, the second core portion, and the coil are stacked in an axial direction,
A stator having a holding portion for holding the plurality of stator portions in a stacked state from both sides in the axial direction. The stator according to claim 2 ,
The holding portion is a first holding portion that is located on one side in the axial direction when a plurality of the stator portions are stacked, and a second holding portion that is located on the other side in the axial direction when a plurality of the stator portions are stacked. A connection portion that connects between the first holding portion and the second holding portion,
The stator, wherein the core back portion is provided as a part of the connection portion. A motor comprising the stator according to any one of claims 1 to 3 . A first core portion having a plurality of claw-shaped magnetic poles extending in the circumferential direction from the disk-shaped core base, and a plurality of claw-shaped magnetic poles extending in the circumferential direction from the disk-shaped core base in the circumferential direction. A method for manufacturing a stator, comprising: a second core portion; and a coil axially sandwiched between the first core portion and the second core portion,
The first core portion and the second core portion are powder magnetic cores formed by compression molding, and a separate core back portion made of a magnetic member abuts on a side radially opposite to the claw-shaped magnetic pole. As well as
The first core portion and the second core portion are provided with a concave portion that is recessed on the claw-shaped magnetic pole side on a side where the core back portion is located in a radial direction, and the core back portion is located in the concave portion. A method for manufacturing a stator, comprising:

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