JP6700595B2 - Brushless motor - Google Patents

Description

  The present invention relates to an axial gap type brushless motor.

  2. Description of the Related Art Conventionally, there is an axial gap type brushless motor that includes a rotor fixed to a rotating shaft so as to be integrally rotatable, and a pair of stators arranged on both sides of the rotor in the axial direction. In such a brushless motor, if the air gap in the axial direction between each stator and the rotor is not uniform, problems such as vibration occur, so that the air gap in the axial direction between each stator and the rotor is uniform. It is important to manage so as to be (constant).

  For example, in the brushless motor described in Patent Document 1, the inner peripheral side end portions of the pair of stators are rotatably supported with respect to a rotating shaft rotatably supported by the housing. Further, the outer peripheral side end portion of each stator is supported so as to be relatively movable in the axial direction and non-rotatably in the circumferential direction with respect to the housing that houses each stator therein. Further, the inner peripheral end of each stator is axially positioned by the positioning means provided on the rotary shaft. The positioning means is provided for each stator at an axial end of each stator opposite to the rotor. The positioning means manages an axial air gap between the rotor fixed to the rotating shaft and each stator.

JP, 2005-304101, A

  By the way, in the brushless motor described in Patent Document 1, the inner peripheral side end portion of each stator is supported so as to be rotatable relative to the rotation shaft, and further, the positioning means provided on the rotation shaft axially moves each stator. Is being positioned. Therefore, there is a problem in that the configuration for managing the air gap in the axial direction between each stator and the rotor becomes complicated, and the assembly of the brushless motor becomes complicated. Further, each stator is movable in the axial direction relative to the housing, and the positioning means is only provided at the axial end portion on the opposite side to the rotor with respect to each stator. Therefore, there is a risk that each stator will move toward the rotor along the axial direction due to vibrations and the like, and the air gap in the axial direction between each stator and the rotor will vary.

  The present invention has been made to solve the above problems, and an object thereof is to provide a brushless motor capable of managing an axial air gap between each stator and a rotor with a simple configuration. Especially.

A brushless motor that solves the above-described problems rotates a rotor that rotates integrally with a rotating shaft, a pair of stators each having a stator core around which a coil is wound, and that is arranged on both sides in the axial direction of the rotor, and that rotates the rotating shaft. An axial gap type brushless motor comprising: a housing that movably supports and holds the pair of stators, and is axially abutted to each of the stators between the one stator and the other stator. and have a positioning member, each said stator includes a plurality of teeth projecting in the axial direction towards the rotor side, and a plurality of coils wound around the teeth, wherein the positioning member, wherein It has a cylindrical shape that surrounds the outer circumference of the rotor, the inner peripheral surface of the positioning member is located radially outside of the coils, and surrounds the plurality of coils radially outside .

  According to this configuration, the axial distance between the pair of stators is determined by the positioning member that axially abuts each stator between the pair of stators. Therefore, the axial distance between the pair of stators can be easily determined only by providing the positioning member between the pair of stators so as to come into contact with each stator in the axial direction. Since the rotor is arranged between the pair of stators whose axial distance is maintained constant by the positioning member, the axial air gap between each stator and the rotor is made uniform (constant). It will be easier. Therefore, the axial air gap between each stator and the rotor can be managed with a simple configuration.

A brushless motor that solves the above-described problems rotates a rotor that rotates integrally with a rotating shaft, a pair of stators each having a stator core around which a coil is wound, and that is arranged on both sides in the axial direction of the rotor, and that rotates the rotating shaft. An axial gap type brushless motor comprising: a housing that movably supports and holds the pair of stators, and is axially abutted to each of the stators between the one stator and the other stator. The housing has a positioning member, and the housing axially holds the other stator between the positioning member and a first end frame that axially sandwiches one of the stators. A second end frame sandwiched between the first end frame and the second end frame in the axial direction, and presses the first and second end frames in the axial direction toward the positioning member. And a connecting member.

According to this configuration, the axial distance between the pair of stators is determined by the positioning member that axially abuts each stator between the pair of stators. Therefore, the axial distance between the pair of stators can be easily determined only by providing the positioning member between the pair of stators so as to come into contact with each stator in the axial direction. Since the rotor is arranged between the pair of stators whose axial distance is maintained constant by the positioning member, the axial air gap between each stator and the rotor is made uniform (constant). It will be easier. Therefore, the axial air gap between each stator and the rotor can be managed with a simple configuration.
According to this structure, one stator is axially pressed to the positioning member side via the first end frame, and the other stator is axially pressed to the positioning member side via the second end frame. To be done. Therefore, since each stator is brought into close contact with the positioning member, the axial distance between the pair of stators can be controlled more accurately according to the positioning member. As a result, the axial air gap between each stator and the rotor can be managed with high accuracy with a simple configuration.
In the brushless motor, the positioning member has a tubular shape that surrounds the outer circumference of the rotor and has an outer circumferential surface located radially outside the respective stators, and each of the first and second end frames and the positioning member. And a sealing member for liquid-tightly sealing between each of the first and second end frames and the outer peripheral surface of the positioning member.
With this configuration, it is possible to prevent water from entering the inside of the brushless motor with a simple configuration using the positioning member.

In the brushless motor described above, it is preferable that the positioning member is located radially outward of the coil.
With this configuration, it is easy to prevent the positioning member from coming into contact with the coil. Further, it becomes easy to increase the contact area between each stator and the positioning member.

In the brushless motor, the positioning member has a cylindrical shape that surrounds the outer periphery of the rotor, and one end of the positioning member in the axial direction abuts one of the stators in the axial direction, and the other of the positioning member in the axial direction. The end is in axial contact with the other stator.
According to this structure, since both ends of the cylindrical positioning member in the axial direction come into contact with the pair of stators from the axial direction, the axial gap between the pair of stators is positioned at any position in the circumferential direction. It is kept constant by the member. Therefore, the axial air gap between each stator and the rotor can be controlled with high accuracy with a simple configuration.
In the brushless motor, it is preferable that the positioning member is a non-magnetic material.
According to this configuration, it is possible to prevent the magnetic flux from flowing to the positioning member.

  According to the brushless motor of the present invention, the axial air gap between each stator and the rotor can be managed with a simple configuration.

FIG. 3 is a partially exploded perspective view of the brushless motor according to the embodiment. (A) is sectional drawing which shows the brushless motor of embodiment typically, (b) and (c) are the elements on larger scale in the sectional view. Sectional drawing which shows the brushless motor of another form typically.

Hereinafter, one embodiment of the brushless motor will be described.
As shown in FIGS. 1 and 2A, a brushless motor 10 includes a disk-shaped rotor 20 fixed to a cylindrical rotation shaft 11 so as to be rotatable integrally therewith, and a rotor 20 on both sides in the axial direction with respect to the rotor 20. It is an axial gap type brushless motor including a pair of stators 30 and 40 (that is, the first stator 30 and the second stator 40) arranged.

  The rotor 20 includes a substantially annular rotor core 21, and a first magnet 22 and a second magnet 23 fixed to both axial end portions of the rotor core 21. The rotor core 21 can be integrally rotated with the rotating shaft 11 by press-fitting the rotating shaft 11 in the center portion in the radial direction. Further, the first magnet 22 fixed to one axial end portion (upper end portion in FIG. 2A) of the rotor core 21, and the other axial end portion (lower end portion in FIG. 2A) of the rotor core 21. The second magnet 23 fixed to is provided with N poles and S poles alternately arranged in the circumferential direction. The second magnet 23 is fixed to the rotor core 21 so as to be displaced from the first magnet 22 by one magnetic pole in the circumferential direction. Therefore, the magnetic poles of the first magnet 22 and the magnetic poles of the second magnet 23 that overlap in the axial direction are magnetic poles different from each other (N pole and S pole).

  The first stator 30 arranged on one axial side (upper side in FIG. 2A) of the rotor 20 includes a first stator core 31 and a plurality of first stator cores 31 wound around the first stator core 31. And a coil 32 of.

  The first stator core 31 has an annular plate-shaped first base portion 34 and a plurality of first base portions 34 that axially protrude from the first base portion 34 toward the rotor 20 (extend in the axial direction). With teeth 35. The plurality of first teeth 35 are provided at equal angular intervals in the circumferential direction. Then, the first coil 32 is wound around each of the first teeth 35 by concentrated winding. Further, the outer peripheral edge portion of the first base portion 34 is located radially outside the plurality of first coils 32. Then, a portion of the first base portion 34 which is an end surface in the axial direction on the rotor 20 side and which is radially outside the first coil 32 is provided with a first stator side abutment having a planar shape orthogonal to the axial direction. A contact surface 36 is provided. An axial end surface (upper end surface in FIG. 2A) of the first base portion 34 opposite to the rotor 20 serves as a first pressed surface 37 having a planar shape orthogonal to the axial direction. There is.

  The second stator 40 arranged on the other axial side of the rotor 20 (lower side in FIG. 2A) has the same configuration as the first stator 30. That is, the second stator 40 includes the second stator core 41 having the same shape as the first stator core 31 and the plurality of second teeth 45 wound around the plurality of second teeth 45 of the second stator core 41. Coil 42 of. The outer peripheral edge portion of the second base portion 44 is located radially outward of the plurality of second coils 42, is the axial end surface of the second base portion 44 on the rotor 20 side, and is the second end portion. A second stator-side abutment surface 46, which has a planar shape and is orthogonal to the axial direction, is provided at a portion radially outside the coil 42. An axial end surface (lower end surface in Fig. 2(a)) of the second base portion 44 opposite to the rotor 20 serves as a second pressed surface 47 having a planar shape orthogonal to the axial direction. There is.

  Further, a positioning member 50 is arranged between the first stator 30 and the second stator 40 to make the axial distance between the first stator 30 and the second stator 40 uniform. ing. The positioning member 50 of the present embodiment is formed of a non-magnetic metal (for example, aluminum alloy). The positioning member 50 has a cylindrical shape with a constant axial height along the circumferential direction, and the inner circumferential surface of the positioning member 50 is radially outward of the first and second coils 32, 42. To position. That is, the positioning member 50 has a cylindrical shape that surrounds the outer circumference of the rotor 20, and is located radially outside the first and second coils 32 and 42. Further, the outer diameter of the positioning member 50 is larger than the outer diameter of the first and second stators 30 and 40 (the outer diameter of the first and second base portions 34 and 44 in this embodiment). Therefore, the outer peripheral surface of the positioning member 50 is located radially outside the first and second stators 30 and 40. Further, in the positioning member 50, the end face in the axial direction on the side of the first stator 30 serves as a first contact surface 51 having a planar shape orthogonal to the axial direction, and the axial direction on the side of the second stator 40. The end surface of is a second contact surface 52 that is in a planar shape orthogonal to the axial direction. The first contact surface 51 and the second contact surface 52 are parallel to each other and each has an annular shape.

  Such a positioning member 50 is in axial contact with each of the stators 30, 40 between the first stator 30 and the second stator 40. More specifically, in the positioning member 50, the first contact surface 51 is in contact with the first stator side contact surface 36 of the first stator 30 from the axial direction, and the second contact surface 52 is the second contact surface 52. The second stator-side contact surface 46 of the stator 40 is axially abutted. Therefore, the axial distance between the first stator 30 and the second stator 40 is a distance according to the axial length of the positioning member 50. The rotor 20 is arranged between the first stator 30 and the second stator 40 whose axial distance is determined by the positioning member 50, so that the first stator 30 and the rotor that face each other in the axial direction are disposed. A first air gap G1 is provided between the second stator 40 and the rotor 20, and a second air gap G2 is provided between the second stator 40 and the rotor 20 that are axially opposed to each other.

  The brushless motor 10 also has a housing 60 that holds the first and second stators 30 and 40. The housing 60 of the present embodiment includes a pair of end frames 61 and 62 (that is, the first end frame 61 and the second end frame 62) arranged on both sides of the first and second stators 30 and 40 in the axial direction. Have. Hereinafter, the first end frame 61 will be referred to as the first frame 61, and the second end frame 62 will be referred to as the second frame 62.

  Each of the first and second frames 61 and 62 is made of, for example, a metal of a magnetized body, and has a substantially disk shape having an outer diameter larger than that of each of the first and second stators 30 and 40. There is. The first frame 61 has a substantially disk-like shape having an outer diameter larger than that of the first stator core 31, and has a first holding portion 61a that holds the first stator 30, and an outer peripheral edge portion of the first holding portion 61a. In addition, the first protrusion portion 61b axially protrudes toward the second frame 62 side from a portion radially outward of the first stator 30. Similarly, the second frame 62 has a substantially disk shape having an outer diameter larger than that of the second stator core 41, and has a second holding portion 62a for holding the second stator 40, and a second holding portion 62a. A second projecting portion 62b that axially projects toward the first frame 61 side from a portion that is an outer peripheral edge portion and is located radially outside of the second stator 40 is provided.

  The first and second holding portions 61a and 62a have a planar shape orthogonal to the axial direction on the inner surface (side surface on the inner side of the brushless motor 10) of each of the first and second base portions 34 and 44. The first and second pressed surfaces 37, 47 have first and second pressing surfaces 61c, 62c that come into contact with each other in the axial direction. Then, the first frame 61 axially sandwiches the first stator core 31 of the first stator 30 (the outer peripheral edge portion of the first base portion 34) between the first frame 61 and the positioning member 50, and The frame 62 axially sandwiches the second stator core 41 of the second stator 40 (the outer peripheral edge portion of the second base portion 44) between the frame 62 and the positioning member 50. Further, the first and second holding portions 61a and 62a respectively hold the first and second bearings 63 and 64 at their central portions. The rotary shaft 11 is rotatably supported by the first and second bearings 63 and 64. That is, the first and second frames 61 and 62 rotatably support the rotary shaft 11 via the first and second bearings 63 and 64.

  The first and second protrusions 61b and 62b axially protrude to the positions on the outer circumference of the positioning member 50 that overlap the positioning member 50 in the radial direction, and have a cylindrical shape. The inner diameters of the first and second protrusions 61b and 62b are substantially equal to the outer diameter of the positioning member 50. Further, as shown in FIGS. 2A, 2B, and 2C, the positioning member 50 is radially opposed to the inner peripheral surfaces of the first and second protrusions 61b and 62b. The first and second annular housing grooves 61d and 62d extending in the circumferential direction are formed at the respective positions. Sealing members 65 and 66 that liquid-tightly seal between the first and second frames 61 and 62 and the outer peripheral surface of the positioning member 50 are housed in the housing grooves 61d and 62d, respectively. .. In the present embodiment, each sealing member 65, 66 is an O-ring. The seal member 65 accommodated in the first accommodating groove 61d is liquid-tightly adhered to the first protrusion 61b and the outer peripheral surface of the positioning member 50, and the seal member 66 accommodated in the second accommodating groove 62d is , And the second protrusion 62b and the outer peripheral surface of the positioning member 50 are liquid-tightly adhered.

  The first frame 61 and the second frame 62 are axially connected by a connecting member 67 on the outer side in the radial direction with respect to the first and second stators 30 and 40. In the present embodiment, the connecting member 67 is a plurality of bolts that penetrate the first frame 61 and are screwed into the second frame 62. The connecting member 67 connects and fixes the first and second frames 61 and 62 in the axial direction and presses the first and second frames 61 and 62 toward the positioning member 50 in the axial direction. ing.

  When assembling the brushless motor 10 as described above, first, the second pressed surface 47 of the second stator core 41 is placed on the second pressed surface 62c of the second frame 62 and the second pressed surface 47c of the second stator core 41 is pressed. The second stator 40 is arranged so as to abut. At this time, the seal member 66 (O-ring in this embodiment) is housed in the second housing groove 62d of the second frame 62. After that, the rotating shaft 11 to which the rotor 20 is fixed is rotatably supported by the second frame 62 via the second bearing 64, and the rotor 20 is axially opposed to the second stator 40. Further, the axial end portion of the positioning member 50 on the second contact surface 52 side is inserted into the second holding portion 62a, and the second contact surface 52 is attached to the second stator of the second stator core 41. The side contact surface 46 is contacted in the axial direction. Either the rotor 20 or the positioning member 50 may be assembled first. Then, the first stator-side contact surface 36 of the first stator core 31 is axially contacted with the first contact surface 51 while the first stator 30 is axially opposed to the rotor 20. To do. After that, the first frame 61 is assembled to the first stator 30 while inserting the axial end portion of the positioning member 50 on the first contact surface 51 side into the first protrusion 61b. At this time, the first frame 61 causes the first pressing surface 61 c to abut against the first pressed surface 37 of the first stator core 31 and rotates the rotary shaft 11 via the first bearing 63. Assembled to support as possible. Then, the brushless motor 10 is completed by connecting the first frame 61 and the second frame 62 with the connecting member 67.

Next, the operation of this embodiment will be described.
The axial distance between the pair of first and second stators 30, 40 is such that the first and second stators 30, 40 have first and second axial distances between the first and second stators 30, 40. It is determined by the positioning member 50 that abuts the two stator cores 31 and 41 from the axial direction. Therefore, by simply providing the positioning member 50 between the first and second stators 30 and 40 so as to abut the stators 30 and 40 in the axial direction, it is possible to easily provide a space between the first and second stators 30 and 40. Axial spacing can be determined. Since the rotor 20 is arranged between the first and second stators 30 and 40 whose axial distance is kept constant by the positioning member 50, the stators 30 and 40 and the rotor 20 are separated from each other. It becomes easy to make the axial air gaps (first and second air gaps G1, G2) between them uniform (constant).

Next, the characteristic effects of this embodiment will be described.
(1) The axial air gap between the first and second stators 30 and 40 and the rotor 20 (that is, the first and second air gaps G1 and G2) can be managed with a simple configuration.

  (2) Since both end portions (first and second contact surfaces 51 and 52) of the cylindrical positioning member 50 in the axial direction contact the first and second stators 30 and 40 in the axial direction, The axial gap between the first and second stators 30, 40 is kept constant by the positioning member 50 at any position in the direction. Therefore, the axial air gap between each of the stators 30 and 40 and the rotor 20 can be managed with high accuracy with a simple configuration.

  (3) The positioning member 50 is located radially outside the first and second coils 32 and 42. Therefore, it is easy to prevent the positioning member 50 from coming into contact with the first and second coils 32 and 42. Further, the contact area between each of the first and second stators 30 and 40 and the positioning member 50 can be easily obtained. In the present embodiment, since the positioning member 50 has a cylindrical shape, the positioning member 50 is located radially outward of the first and second coils 32 and 42, thereby increasing the diameter of the positioning member 50. Therefore, the areas of the first and second contact surfaces 51 and 52 can be increased. Therefore, the contact state between the first and second stators 30 and 40 and the positioning member 50 can be made more stable, so that the axial distance between the first and second stators 30 and 40 can be made more stable. It can be made uniform (constant).

  (4) Since the positioning member 50 is a non-magnetic material, it is possible to prevent magnetic flux from flowing through the positioning member 50. That is, it is possible to suppress the generation of leakage magnetic flux by the positioning member 50.

  (5) The first stator 30 is axially pressed toward the positioning member 50 side via the first frame 61, and the second stator 40 is axially moved toward the positioning member 50 side via the second frame 62. Is pressed in the direction. Therefore, the stators 30 and 40 are brought into close contact with the positioning member 50, so that the axial distance between the first and second stators 30 and 40 can be controlled more accurately according to the positioning member 50. You can As a result, the axial air gap between each of the stators 30 and 40 and the rotor 20 can be managed with high accuracy with a simple configuration.

  (6) The positioning member 50 has a cylindrical shape that surrounds the outer periphery of the rotor 20 and has an outer peripheral surface located radially outside the first and second stators 30 and 40. Further, between each of the first and second protrusions 61b and 62b and the outer peripheral surface of the positioning member 50, between each of the first and second frames 61 and 62 and the outer peripheral surface of the positioning member 50. Sealing members 65 and 66 for liquid-tightly sealing are respectively arranged. Therefore, intrusion of water into the interior of the brushless motor 10 can be suppressed with a simple configuration using the positioning member 50.

  (7) Since the positioning member 50 is in axial contact with the first and second stator cores 31 and 41 of the first and second stators 30 and 40, the positioning members 50 can be separated from each other. It is easy to stabilize the contact state. Therefore, it becomes easy to make the axial distance between the first and second stators 30 and 40 uniform (constant) by the positioning member 50.

The above embodiment may be modified as follows.
-In the said embodiment, the sealing members 65 and 66 are O-rings. However, as long as the first frame 61 and the outer peripheral surface of the positioning member 50 are liquid-tightly adhered, and the second frame 62 and the outer peripheral surface of the positioning member 50 are liquid-tightly adhered, a seal is formed. The members 65 and 66 do not necessarily have to be O-rings. For example, the seal members 65 and 66 may be gaskets or adhesives filled between the first and second frames 61 and 62 and the outer peripheral surface of the positioning member 50, respectively. Further, the brushless motor 10 does not necessarily have to include the seal members 65 and 66.

  -In the said embodiment, the bolt is used for the connection member 67 which connects the 1st frame 61 and the 2nd frame 62 to the axial direction. However, the connecting member 67 is not limited to the bolt, and may be any member that connects the first frame 61 and the second frame 62 in the axial direction and presses the frames 61, 62 in the axial direction toward the positioning member 50. Good.

  In the above embodiment, the pressing members that press the stators 30 and 40 axially toward the positioning member 50 are configured by the first and second frames 61 and 62 and the connecting member 67. However, the structure of the pressing member is not limited to this. For example, a spring or the like may be used as the pressing member to press the stators 30 and 40 axially toward the positioning member 50. Even in this case, the pressing member axially presses the first and second stators 30 and 40 toward the positioning member 50. Therefore, the stators 30 and 40 are brought into close contact with the positioning member 50, so that the axial distance between the first and second stators 30 and 40 can be controlled more accurately according to the positioning member 50. You can As a result, the axial air gap between each of the stators 30 and 40 and the rotor 20 can be managed with high accuracy with a simple configuration.

  In the above embodiment, the housing 60 is configured to include the first and second frames 61 and 62 arranged on both sides of the first and second stators 30 and 40 in the axial direction. However, the structure of the housing that holds the first and second stators 30 and 40 is not limited to this.

  For example, in the example shown in FIG. 3, the housing 70 includes a housing body 71 having a bottomed tubular shape and an end frame 72 that closes an opening of the housing body. In addition, in FIG. 3, the same reference numerals are given to the same configurations and corresponding configurations as the above-described embodiment. The second bearing 64 is arranged at the center of the bottom 71 a of the housing body 71, and the first bearing 63 is arranged at the center of the end frame 72. Further, the first and second stators 30 and 40 are fixed (for example, press-fitted and fixed) to the inner peripheral surface of the side wall portion 71b of the housing body 71. In the example shown in FIG. 3, the second stator 40 is axially separated from the bottom portion 71a of the housing body 71, but may be in contact with the bottom portion 71a. The positioning member 50 arranged between the first and second stators 30 and 40 facing each other in the axial direction is located radially outside the first and second coils 32 and 42, and at the outside thereof. The diameter is smaller than the inner diameter of the side wall portion 71b. Even in this case, the same effects as (1) to (4) and (7) of the above embodiment can be obtained.

  The positioning member 50 may be made of a non-magnetic material other than aluminum alloy (for example, non-magnetic stainless steel or the like). Further, the positioning member 50 does not necessarily have to be a non-magnetic material.

  -In the above-mentioned embodiment, the positioning member 50 has a cylindrical shape. However, the shape of the positioning member 50 is not limited to this. For example, the positioning member 50 may have a polygonal tubular shape, an elliptical tubular shape as viewed in the axial direction, or the like. Further, the positioning member 50 is not limited to the cylindrical shape, and may have an arc shape, a flat plate shape, or the like. Further, the positioning member 50 may have a columnar shape extending in the axial direction, and a plurality of the positioning members 50 may be arranged on the outer circumference of the rotor 20 in the circumferential direction.

  In the above embodiment, the positioning member 50 is in axial contact with the first and second stator cores 31, 41 of the first and second stators 30, 40. However, in the first and second stators 30 and 40, the locations where the positioning member 50 abuts in the axial direction need not necessarily be the first and second stator cores 31 and 41. For example, the positioning member 50 axially abuts an insulator mounted on the first and second stator cores 31 and 41 for electrical insulation between the first and second coils 32 and 42. It may be.

Next, technical ideas that can be understood from the above-described embodiment and modified examples will be added below.
(A) The brushless motor according to any one of claims 1 to 6, further comprising a pressing member that axially presses each of the stators toward the positioning member.

  According to this structure, one stator is axially pressed toward the positioning member side by the pressing member, and the other stator is axially pressed toward the positioning member side. Therefore, since each stator is brought into close contact with the positioning member, the axial distance between the pair of stators can be controlled more accurately according to the positioning member. As a result, the axial air gap between each stator and the rotor can be managed with high accuracy with a simple configuration.

  (B) In the brushless motor according to any one of claims 1 to 6 and (a), the positioning member is in axial contact with the stator cores of the pair of stators. Brushless motor.

  According to this configuration, it is easy to stabilize the contact state between each stator and the positioning member. Therefore, it becomes easy to make the axial distance between the pair of stators uniform by the positioning member.

  DESCRIPTION OF SYMBOLS 10... Brushless motor, 11... Rotating shaft, 20... Rotor, 30... 1st stator as a stator, 31... 1st stator core as a stator core, 32... 1st coil as a coil, 40... 1st as a stator No. 2 stator, 41... Second stator core as stator core, 42... Second coil as coil, 50... Positioning member, 60, 70... Housing, 61... First end frame, 62... Second end frame , 65, 66... Sealing member, 67... Connecting member.

Claims (6)

A rotor that rotates integrally with the rotating shaft,
A pair of stators, each having a stator core around which a coil is wound, and arranged on both sides in the axial direction of the rotor;
A housing that rotatably supports the rotating shaft and holds the pair of stators;
Is an axial gap type brushless motor equipped with
And have a positioning member in contact with the axial direction of each said stator between one of the stator and the other of said stator,
Each of the stators has a plurality of teeth projecting in the axial direction toward the rotor side, and a plurality of coils wound around the teeth,
The positioning member has a cylindrical shape that surrounds the outer periphery of the rotor, the inner peripheral surface of the positioning member is located radially outside the coils, and surrounds the plurality of coils radially outside. Brushless motor that does. A rotor that rotates integrally with the rotating shaft,
A pair of stators each having a stator core around which a coil is wound and arranged on both sides in the axial direction of the rotor;
A housing that rotatably supports the rotating shaft and holds the pair of stators;
Is an axial gap type brushless motor equipped with
It has a positioning member that is in axial contact with each of the stators between the one stator and the other stator,
The housing has a first end frame that axially sandwiches the one stator with the positioning member, and a second end frame that axially sandwiches the other stator with the positioning member. And a connecting member that axially connects the first end frame and the second end frame and presses the first and second end frames axially toward the positioning member. And brushless motor. The brushless motor according to claim 2 ,
The positioning member has a tubular shape that surrounds the outer circumference of the rotor and has an outer circumferential surface located radially outward of each of the stators,
Between each of the first and second end frames and the outer peripheral surface of the positioning member, liquid-tightly seals between each of the first and second end frames and the outer peripheral surface of the positioning member. A brushless motor is characterized in that respective sealing members are arranged. The brushless motor according to claim 2 or 3 ,
The brushless motor, wherein the positioning member is positioned radially outward of the coil. The brushless motor according to any one of claims 1 to 4 ,
The positioning member has a cylindrical shape that surrounds the outer periphery of the rotor, one end of the positioning member in the axial direction abuts one of the stators in the axial direction, and the other end of the positioning member in the axial direction of the other is the other. A brushless motor, which is in contact with the stator in the axial direction. The brushless motor according to any one of claims 1 to 5 ,
The brushless motor according to claim 1, wherein the positioning member is a non-magnetic material.