JP2019030154A - Stator and motor - Google Patents

Abstract

To provide a stator and a motor, which suppresses the vibration of teeth, and in which a leakage is difficult to occur from the teeth.SOLUTION: A stator includes: a stator core 41 of a magnetic material; and an earthquake-proof members 441 and 442 of a non-magnetic material. The stator core includes a core back 411, and a plurality of teeth 412. The form of the core back is perpendicular to a center axis extended vertically. The plurality of teeth 412 is extended to a radial direction from the core back. The earthquake-proof members 441 and 442 contact to each of the plurality of teeth. The vibration of the teeth during the driving of a motor is suppressed by each of the earthquake-proof members. Since each earthquake-proof member is the non-magnetic material, and thus, it is difficult to leak a flux from the teeth.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a stator and a motor.

  The motor has a stator and a rotor. The stator has a plurality of coils. The rotor has a plurality of magnets. When the motor is driven, a drive current is supplied to the plurality of coils. Torque is generated between the stator and the rotor magnet by the rotating magnetic field generated thereby. As a result, the rotor rotates with respect to the stator.

A conventional motor is described in, for example, Japanese Patent Application Laid-Open No. 2001-190038.
JP 2001-190038 A

  When the motor is driven, a magnetic attractive force and a magnetic repulsive force are generated at a minute time interval between the stator and the rotor. Thereby, the teeth which become the magnetic core of the coil vibrate. The vibration of the teeth can cause vibration and noise of the entire motor. In recent years, motors used for automobile power steering and the like are required to have extremely high quietness and low vibration. In order to realize this quietness and low vibration property, it is necessary to suppress the above-described vibration of the teeth.

  Japanese Patent Application Laid-Open No. 2001-190038 describes a structure that receives a reaction force of rotational torque by bringing adjacent tooth tips into contact with each other (see abstracts and the like). However, when teeth tip portions are brought into contact with each other as in this document, magnetic flux generated in the teeth leaks to the adjacent teeth. If it does so, the output torque of a motor will fall.

  The objective of this invention is providing the stator and motor which suppress the vibration of the tooth | gear at the time of the drive of a motor, and are hard to produce the leakage of the magnetic flux from a tooth | gear.

  1st invention of this application is a stator used for a motor, Comprising: It has a stator core of a magnetic body, and a nonmagnetic seismic damping member which contacts the stator core, and the stator core extends up and down. An annular core back having a central axis as a center, and a plurality of teeth extending in a radial direction from the core back, wherein the vibration control member contacts each of the plurality of teeth.

  According to the exemplary first invention of the present application, the vibration of the teeth during driving of the motor can be suppressed by the vibration control member. Moreover, since the damping member is a non-magnetic material, magnetic flux leakage from the teeth hardly occurs.

FIG. 1 is a longitudinal sectional view of a motor. FIG. 2 is a cutaway perspective view of the stator core. FIG. 3 is a cutaway perspective view of the stator core and the two vibration control members. FIG. 4 is a diagram illustrating a result of analyzing the magnitude of vibration of each part of the stator core. FIG. 5 is a diagram showing the result of analyzing the magnitude of vibration of each part of the stator core. FIG. 6 is a cutaway perspective view of a stator core and two damping members according to a modification. FIG. 7 is a cutaway perspective view of a stator core and two damping members according to a modification. FIG. 8 is a cutaway perspective view of a stator core and two damping members according to a modification. FIG. 9 is a cutaway perspective view of a stator core and two damping members according to a modification.

  Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In this application, the direction parallel to the central axis of the motor is the “axial direction”, the direction orthogonal to the central axis of the motor is the “radial direction”, and the direction along the arc centered on the central axis of the motor is the “circumferential direction”. , Respectively. Moreover, in this application, the shape and positional relationship of each part are demonstrated by making an axial direction into an up-down direction and making a bus-bar unit side into the stator upward. However, the definition of the vertical direction is not intended to limit the orientation of the motor according to the present invention during manufacture and use.

  Further, the above-mentioned “parallel direction” includes a substantially parallel direction. Further, the above-described “orthogonal direction” includes a substantially orthogonal direction.

<1. Overall configuration of motor>
FIG. 1 is a longitudinal sectional view of a motor 1 according to an embodiment of the present invention. The motor 1 of the present embodiment is mounted on, for example, an automobile and is used as a driving source that generates driving force of an electric power steering apparatus. However, the motor of the present invention may be used for applications other than power steering. For example, the motor of the present invention may be used as a driving source for other parts of an automobile, for example, an engine cooling fan or an oil pump. The motor of the present invention may be mounted on home appliances, OA equipment, medical equipment, etc., and generate various driving forces.

  As shown in FIG. 1, the motor 1 has a stationary part 2 and a rotating part 3. The stationary part 2 is fixed to a frame of a device to be driven. The rotating unit 3 is rotatably supported with respect to the stationary unit 2.

  The stationary part 2 of the present embodiment includes a housing 21, a stator 22, a bus bar unit 23, a lower bearing part 24, and an upper bearing part 25.

  The housing 21 includes a cylindrical portion 211, a bottom plate portion 212, and a lid portion 213. The cylindrical portion 211 extends in a substantially cylindrical shape in the axial direction on the radially outer side of the stator 22 and the bus bar unit 23. The bottom plate portion 212 extends substantially perpendicular to the central axis 9 below the stator 22 and the rotor 32 described later. The lid portion 213 extends substantially perpendicular to the central axis 9 above the bus bar unit 23. The stator 22, the bus bar unit 23, and the rotor 32 described later are accommodated in the internal space of the housing 21.

  The cylindrical portion 211, the bottom plate portion 212, and the lid portion 213 are made of a metal such as aluminum or stainless steel, for example. In the present embodiment, the cylindrical portion 211 and the bottom plate portion 212 are constituted by one member, and the lid portion 213 is constituted by another member. However, the cylindrical part 211 and the cover part 213 may be comprised by one member, and the baseplate part 212 may be comprised by the other member.

  The stator 22 is disposed on the radially outer side of the rotor 32 described later. The stator 22 includes a stator core 41, an insulator 42, a plurality of coils 43, and two vibration control members 44. The stator core 41 is made of a laminated steel plate that is a magnetic material. The stator core 41 has an annular core back 411 and a plurality of teeth 412 extending radially inward from the core back 411. The core back 411 is disposed substantially coaxially with the central axis 9. Further, the outer peripheral surface of the core back 411 is fixed to the inner peripheral surface of the tubular portion 211 of the housing 21. The plurality of teeth 412 are arranged at substantially equal intervals in the circumferential direction.

  The insulator 42 is made of a resin that is an insulator. Of the surface of the stator core 41, at least a part of the upper surface, a part of the lower surface, and a part of both end surfaces in the circumferential direction of each tooth 412 are covered with the insulator 42. The coil 43 is constituted by a conductive wire 430 wound around the insulator 42. That is, in this embodiment, the conducting wire 430 is wound around the teeth 412 serving as a magnetic core via the insulator 42. The insulator 42 is interposed between the tooth 412 and the coil 43, thereby preventing the tooth 412 and the coil 43 from being electrically short-circuited.

  The vibration control member 44 is a member for suppressing vibration of the teeth 412 when the motor 1 is driven. The stator 22 of the present embodiment has two vibration damping members 44, an upper vibration damping member 441 and a lower vibration damping member 442. The upper damping member 441 is fixed to the upper ends of the radially inner tip portions of the plurality of teeth 412. The lower vibration damping member 442 is fixed to the lower ends of the radially inner tip portions of the plurality of teeth 412. For example, a non-magnetic metal is used as the material of the upper damping member 441 and the lower damping member 442.

  A more detailed structure of the damping member 44 will be described later.

  The bus bar unit 23 includes a bus bar 51 made of a metal such as copper, which is a conductor, and a resin bus bar holder 52 that holds the bus bar 51. The bus bar 51 is electrically connected to the conductive wire 430 constituting the coil 43. In addition, when the motor 1 is used, a conductive wire extending from an external power source is connected to the bus bar 51. That is, the coil 43 and an external power source are electrically connected via the bus bar 51. Note that a circuit board may be provided in the housing 21 instead of the bus bar unit 23. The coil 43 and the external power supply may be electrically connected via a circuit board.

  The lower bearing portion 24 and the upper bearing portion 25 are disposed between the housing 21 and the shaft 31 on the rotating portion 3 side. For the lower bearing portion 24 and the upper bearing portion 25 of the present embodiment, ball bearings that relatively rotate the outer ring and the inner ring via a sphere are used. The outer ring of the lower bearing portion 24 is fixed to the bottom plate portion 212 of the housing 21. The outer ring of the upper bearing portion 25 is fixed to the lid portion 213 of the housing 21. The inner rings of the lower bearing portion 24 and the upper bearing portion 25 are fixed to the shaft 31. Thereby, the shaft 31 is rotatably supported with respect to the housing 21. However, other types of bearings such as a slide bearing and a fluid bearing may be used instead of the ball bearing.

  The rotating unit 3 according to the present embodiment includes a shaft 31 and a rotor 32.

  The shaft 31 is a columnar member extending along the central axis 9. For example, a metal such as stainless steel is used as the material of the shaft 31. The shaft 31 rotates about the central axis 9 while being supported by the lower bearing portion 24 and the upper bearing portion 25 described above. Further, the upper end portion 311 of the shaft 31 protrudes upward from the lid portion 213. A device to be driven is connected to the upper end portion 311 of the shaft 31 via a power transmission mechanism such as a gear. Note that the shaft 31 does not necessarily have to protrude upward in the axial direction from the lid 213. That is, a through hole may be provided in the bottom portion 212, and the lower end portion of the shaft may protrude below the bottom portion 212 through the through hole. The shaft may be a hollow member.

  The rotor 32 is located on the radially inner side of the stator 22 and rotates together with the shaft 31. The rotor 32 includes a rotor core 61 and a plurality of magnets 62. The rotor core 61 is made of a laminated steel plate in which electromagnetic steel plates are laminated in the axial direction. The rotor core 61 has a through hole 60 extending in the axial direction at the center thereof. The shaft 31 is press-fitted into the through hole 60 of the rotor core 61. Thereby, the rotor core 61 and the shaft 31 are fixed to each other. A member such as a bush may be disposed between the inner side surface constituting the through hole 60 and the outer side surface of the shaft 31. That is, the shaft 31 and the rotor core 61 may be fixed directly or indirectly.

  The plurality of magnets 62 are fixed to the outer peripheral surface of the rotor core 61 with, for example, an adhesive. The radially outer surface of each magnet 62 is a magnetic pole surface facing the radially inner end surface of the tooth 412. The plurality of magnets 62 are arranged in the circumferential direction so that N poles and S poles are alternately arranged. Instead of the plurality of magnets 62, one annular magnet in which N poles and S poles are alternately magnetized in the circumferential direction may be used. Further, the plurality of magnets 62 may be fixed to the rotor core 61 by a mold using resin, or may be indirectly fixed using other members.

  When a drive current is supplied from the external power source to the coil 43 via the bus bar 51, magnetic flux is generated in the plurality of teeth 412 of the stator core 41. A circumferential torque is generated by the action of magnetic flux between the teeth 412 and the magnet 62. As a result, the rotating unit 3 rotates about the central axis 9 with respect to the stationary unit 2.

<2. About vibration control materials>
Subsequently, the two vibration control members 44 included in the stator 22 will be described in more detail. FIG. 2 is a cutaway perspective view of the stator core 41. FIG. 3 is a cutaway perspective view of the stator core 41 and the two vibration control members 44. In the following, FIG. 2 and FIG.

  As described above, the stator core 41 has an annular core back 411 and a plurality of teeth 412. Each tooth 412 extends radially inward from the core back 411. The distal end portion on the radially inner side of the teeth 412 extends in the circumferential direction more than the other portions of the teeth 412. The stator core 41 may be a single member or may be composed of a plurality of members. For example, the stator core 41 may be an annular combination of core pieces divided for each tooth 412.

  The damping member 44 is a single member that contacts the plurality of teeth 412. In the present embodiment, two damping members 44, an upper damping member 441 and a lower damping member 442, are attached to one stator core 41. The upper damping member 441 is in contact with the upper ends of the radially inner tip portions of the plurality of teeth 412. The lower damping member 442 is in contact with the lower ends of the radially inner tip portions of the plurality of teeth 412.

  When the motor 1 is driven, a magnetic attractive force and a magnetic repulsive force are generated between the teeth 412 and the rotor 32 at a minute time interval. However, in the motor 1, a static frictional force is generated between the teeth 412 and the vibration control member 44 because the vibration control member 44 is in contact with each tooth 412. For this reason, the vibration of the teeth 412 due to the magnetic attractive force and the magnetic repulsive force is suppressed. As a result, vibration and noise during driving of the motor 1 are reduced.

  Particularly, the tooth 412 that is most likely to vibrate is the tip portion on the radially inner side of the tooth 412. In the present embodiment, the two damping members 44 are in contact with the radially inner tip of the teeth 412. Thereby, the vibration of the teeth 412 is efficiently suppressed.

  A nonmagnetic material is used as the material of the vibration control member 44. For this reason, although the damping member 44 is in contact with the tooth 412, leakage of magnetic flux from the tooth 412 to the damping member 44 hardly occurs. That is, even if the damping member 44 is added, the magnetic flux flowing between the teeth 412 and the rotor 32 is not reduced. Therefore, high output torque can be obtained while suppressing the vibration of the teeth 412.

  Specific examples of the material used for the vibration control member 44 include non-magnetic aluminum, aluminum alloy, stainless steel, or resin. However, if a metal such as aluminum, an aluminum alloy, or stainless steel is used, the rigidity of the vibration control member 44 can be increased as compared with the case where a resin is used. Therefore, the vibration of the teeth 412 can be further suppressed. In particular, if stainless steel such as SUS is used, the vibration control member 44 can be made more rigid.

  The vibration control member 44 of the present embodiment is annular in top view. If the damping member 44 is annular, the circumferential displacement of the damping member 44 can be suppressed. Therefore, the vibration in the circumferential direction of the teeth 412 can be further suppressed. However, the damping member 44 may have an arc shape in which a part of the circumferential direction is interrupted when viewed from above. If the damping member 44 has an arc shape, the damping member 44 can be easily fitted inside the plurality of teeth 412 by bending the damping member 44.

  Moreover, as shown in FIGS. 1 and 3, the vibration control member 44 of the present embodiment has an L-shaped cross-sectional shape. Specifically, the upper damping member 441 and the lower damping member 442 of the present embodiment each have an annular first contact portion 71 and an annular second contact portion 72.

  The first contact portion 71 of the upper damping member 441 contacts the upper end surface of the tooth 412 in the axial direction. The second contact portion 72 of the upper damping member 441 protrudes from the radially inner end of the first contact portion 71 downward in the axial direction. Then, the second contact portion 72 of the upper vibration damping member 441 contacts the end surface on the radially inner side of the tooth 412. The first contact portion 71 of the lower vibration control member 442 contacts the lower end surface of the tooth 412 in the axial direction. The second contact portion 72 of the lower vibration damping member 442 protrudes upward in the axial direction from the radially inner end of the first contact portion 71. Then, the second contact portion 72 of the lower damping member 442 contacts the end surface on the radially inner side of the tooth 412.

  Thus, in this embodiment, each damping member 44 contacts the two end surfaces of the teeth 412 in the axial direction and the radial direction. Thereby, the vibration of the teeth 412 is further suppressed.

  When the upper damping member 441 is fixed to the stator core 41, for example, the second contact portion 72 of the upper damping member 441 is press-fitted from the upper side of the stator core 41 to the radially inner side of the plurality of teeth 412. Then, the first contact portion 71 of the upper damping member 441 is abutted against the upper surface of the radially inner tip portion of the plurality of teeth 412. Further, when the lower damping member 442 is fixed to the stator core 41, for example, the second contact portion 72 of the lower damping member 442 is press-fitted from the lower side of the stator core 41 into the radial inner side of the plurality of teeth 412. Then, the first contact portion 71 of the lower vibration damping member 442 is abutted against the lower surface of the distal end portion on the radially inner side of the plurality of teeth 412.

  Thus, in the present embodiment, a part of the vibration control member 44 is press-fitted inside the plurality of teeth 412 in the radial direction. Therefore, each tooth 412 receives the pressure which goes to the radial direction outer side from the damping member 44 like the broken-line arrow in FIG. Thereby, the vibration of each tooth 412 is suppressed. Further, the above-described static frictional force generated between the teeth 412 and the vibration control member 44 is also increased. As a result, vibration and noise during driving of the motor 1 are further reduced.

  However, the method of fixing the vibration control member 44 to the stator core 41 may be adhesion. That is, the stator 22 may have an adhesive interposed between the plurality of teeth 412 and the vibration control member 44. Moreover, the 1st contact part 71 and the 2nd contact part 72 do not necessarily need to contact the whole surface with respect to the surface which opposes. If pressure is applied, it may be point contact or line contact. That is, only a part of the first contact part 71 and a part of the second contact part 72 may contact the teeth 412.

  Further, as shown in FIG. 1, in the present embodiment, the upper damping member 441 is positioned on the upper side in the axial direction from the upper surface of the rotor 32. Further, the lower vibration damping member 442 is located on the lower side in the axial direction than the lower surface of the rotor 32. Thus, if each damping member 44 is arrange | positioned in the axial direction position different from the rotor 32, the rotor 32 and the damping member 44 will not overlap in radial direction. Therefore, the outer peripheral surface of the rotor 32 and the distal end portion on the radially inner side of the teeth 412 can be brought close to each other in the radial direction. Thereby, a higher torque can be generated between the teeth 412 and the rotor 32.

  4 and 5 are diagrams showing the results of analyzing the magnitude of vibration of each part of the stator core 41 during driving of the motor 1 using simulation software. FIG. 4 shows an analysis result when there is no damping member 44 (state of FIG. 2). FIG. 5 shows an analysis result in the case where the vibration control member 44 is present (the state of FIG. 3). The conditions other than the presence or absence of the vibration control member 44 are the same in FIG. 4 and FIG. 4 and 5, the darker color portion has a larger deformation amount due to vibration, and the lighter color portion has a smaller deformation amount due to vibration.

  Comparing the results of FIGS. 4 and 5, the amount of deformation of each tooth 412 is smaller when the damping member 44 is present (FIG. 5) than when the damping member 44 is absent (FIG. 4). Yes. From this result, it can be seen that the vibration of the teeth 412 when the motor 1 is driven can be suppressed by providing the vibration control member 44.

<3. Modification>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

  FIG. 6 is a cutaway perspective view of a stator core 41A and two vibration control members 44A according to a modification.

  In the example of FIG. 6, an upper cutout 81 </ b> A and a lower cutout 82 </ b> A are provided at the radially inner tip of each tooth 412 </ b> A. The upper cutout 81A is located at the upper end of the distal end portion on the radially inner side of the teeth 412A. Further, the upper notch 81A is recessed radially outward from the radially inner end face of the teeth 412A, recessed downward from the upper face of the teeth 412A, and spans the entire width of the distal end portion of the teeth 412A radially inside. Extending in the circumferential direction. The lower notch 82A is located at the lower end of the distal end portion on the radially inner side of the teeth 412A. The lower notch 82A is recessed radially outward from the radially inner end surface of the tooth 412A, recessed upward from the lower surface of the tooth 412A, and spans the entire width of the distal end portion of the teeth 412A on the radially inner side. It extends in the circumferential direction.

  On the other hand, in the example of FIG. 6, the two vibration control members 44 </ b> A are both annular, and the cross-sectional shape is rectangular. The upper vibration damping member 441A is accommodated in the plurality of teeth 412A in the upper notches 81A at a plurality of locations in the circumferential direction. And the lower surface and outer peripheral surface of upper damping member 441A are in contact with the surface which constitutes upper notch 81A of teeth 412A. Further, the lower vibration damping member 442A is accommodated in the lower notches 82A of the plurality of teeth 412A at a plurality of locations in the circumferential direction, respectively. And the upper surface and outer peripheral surface of lower damping member 442A contact the surface which constitutes lower notch 82A of teeth 412A. The cross-sectional shape of the vibration control member 44A is not limited to a rectangular shape, and may be other shapes such as a polygonal shape and a circular shape.

  Even in such a structure, when the vibration control member 44A comes into contact with each tooth 412A, a static frictional force is generated between the teeth 412A and the vibration control member 44A. For this reason, the vibration of the teeth 412A during driving of the motor can be suppressed. In particular, if the damping member 44 is press-fitted into the upper notch 81A and the lower notch 82A, each tooth 412A receives a pressure directed radially outward from the damping member 44A. Thereby, the vibration of each tooth 412A is further suppressed. As a result, vibration and noise during driving of the motor are further reduced.

  Moreover, according to the structure of FIG. 6, it can suppress that 44 A of damping members protrude radially inward from the end surface inside radial direction of each teeth 412A. Moreover, it can also suppress that the upper damping member 441A protrudes upward from the upper surface of each tooth 412A. Moreover, it can also suppress that the lower damping member 442A protrudes below from the lower surface of each tooth 412A. Accordingly, it is possible to widen the space for arranging the peripheral components such as the rotor.

  FIG. 7 is a cutaway perspective view of a stator core 41B and two vibration control members 44B according to another modification.

  In the example of FIG. 7, an upper notch 81B and a lower notch 82B are provided at the radially inner tip of each tooth 412B. The upper cutout 81B is located at the upper end of the distal end portion on the radially inner side of the teeth 412B. The upper notch 81B is recessed radially outward from the radially inner end surface of the tooth 412B, recessed downward from the upper surface of the tooth 412B, and spans the entire width of the distal end portion of the teeth 412B on the radially inner side. Extending in the circumferential direction. The lower notch 82B is located at the lower end of the distal end portion on the radially inner side of the teeth 412B. The lower notch 82B is recessed radially outward from the radially inner end surface of the teeth 412B, recessed upward from the lower surface of the teeth 412B, and spans the entire width of the distal end portion of the teeth 412B radially inward. It extends in the circumferential direction.

  On the other hand, in the example of FIG. 7, the upper vibration damping member 441B has an upper base portion 911B and an upper leg portion 912B. The upper base portion 911B is a disk-shaped portion that is disposed perpendicular to the axial direction. The upper base portion 911B has a circular hole 910B for passing the shaft in the center thereof. The upper leg portion 912B extends downward in the axial direction from the upper base portion 911B. The shape of the upper leg portion 912B is a cylindrical shape centered on the central axis. The lower end portion of the upper leg portion 912B is accommodated in the upper cutout 81B. Thereby, the lower end part of the upper leg part 912B contacts the surface which comprises the upper notch 81B of the teeth 412B.

  In the example of FIG. 7, the lower vibration control member 442B includes a lower base portion 921B and a lower leg portion 922B. The lower base 921B is a disk-shaped part disposed perpendicular to the axial direction. The lower base 921B has a circular hole 920B for passing a shaft in the center thereof. The lower leg portion 922B extends axially upward from the lower base portion 921B. The shape of the lower leg portion 922B is a cylindrical shape centered on the central axis. The upper end portion of the lower leg portion 922B is accommodated in the lower notch 82B. Thereby, the upper end part of the lower leg part 922B contacts the surface which comprises the lower notch 82B of the teeth 412B.

  Even in such a structure, when the vibration control member 44B comes into contact with each tooth 412B, a static frictional force is generated between the teeth 412B and the vibration control member 44B. For this reason, the vibration of the teeth 412B during driving of the motor can be suppressed. In particular, if the upper leg portion 912B and the lower leg portion 922B are press-fitted into the upper notch 81B and the lower notch 82B, each tooth 412B receives pressure toward the radially outer side from the vibration control member 44B. Thereby, the vibration of each tooth 412B is further suppressed. As a result, vibration and noise during driving of the motor are further reduced.

  Further, as shown in FIG. 7, the casing 21B can be formed by the upper damping member 441B and the lower damping member 442B. You may use this housing | casing 21B as a housing of the motor mentioned above. If it does so, compared with the case where a housing and a damping member are prepared separately, the number of parts of a motor can be reduced.

  Each of the plurality of teeth 412B may have a groove recessed downward in the axial direction on the upper end surface in the axial direction instead of the upper notch 81B. And the lower end part of the upper leg part 912B of the upper damping member 441B may fit in the said groove | channel. Each of the plurality of teeth 412B may have a groove recessed in the axially upper side on the lower end surface in the axial direction instead of the lower notch 82B. And the upper end part of the lower leg part 922B of the lower damping member 442B may fit in the said groove | channel. If it does in this way, the contact area of the upper leg part 912B and the lower leg part 922B and the teeth 412B will increase. Thereby, the vibration of the teeth 412B can be further suppressed.

  Moreover, you may provide the through-hole extended in an axial direction in each teeth 412B. And the lower end part of the upper leg part 912B of the upper damping member 441B and the upper end part of the lower leg part 922B of the lower damping member 442B may fit into the through-hole.

  FIG. 8 is a cutaway perspective view of a stator core 41C and two damping members 44C according to another modification.

  In the example of FIG. 8, the upper damping member 441C includes a first ring portion 931C, a second ring portion 932C, and a plurality of extending portions 933C. The first ring portion 931C extends in the circumferential direction along the upper surface of the distal end portion on the radially inner side of the plurality of teeth 412C. The second ring portion 932C extends in the circumferential direction along the upper surface of the core back 411C. The plurality of extending portions 933C extend in the radial direction along the upper surface of the teeth 412C between the first ring portion 931C and the second ring portion 932C. The shape of the extending portion 933C in plan view and the shape of the teeth 412C in plan view are substantially the same.

  A part or all of the first ring portion 931C, the second ring portion 932C, and the extending portion 933C are fixed to the stator core 41C. Similarly, the lower vibration control member 442C includes a first ring portion, a second ring portion, and an extending portion.

  The stator core 41C is made of a laminated steel plate in which a plurality of electromagnetic steel plates are laminated in the axial direction. In this example, a damping member 44C having substantially the same shape as that of the electromagnetic steel sheet is laminated on the upper surface and the lower surface of the stator core 41C. If it does in this way, the damping member 44C can be provided, without producing a big unevenness | corrugation in the external shape of a stator. Further, the contact area between the teeth 412C and the vibration control member 44C can be increased. Therefore, the static friction force generated between the teeth 412C and the vibration control member 44C increases.

  Further, a part of the vibration control member 44C may be press-fitted into the teeth 412C. If it does so, each teeth 412C will receive the pressure of radial direction from the damping member 44C. Thereby, the vibration of each tooth 412C is further suppressed. As a result, vibration and noise during driving of the motor are further reduced.

  FIG. 9 is a cutaway perspective view of a stator core 41D and two vibration control members 44D according to another modification.

  In the example of FIG. 9, an upper notch 81D and a lower notch 82D are provided at the radially inner tip of each tooth 412D. The upper notch 81D is positioned at the upper end of the tip portion on the radially inner side of the teeth 412D. The upper notch 81D is recessed radially outward from the radially inner end surface of the tooth 412D, recessed downward from the upper surface of the tooth 412D, and spans the entire width of the distal end portion of the teeth 412D on the radially inner side. Extending in the circumferential direction. The lower notch 82D is positioned at the lower end of the distal end portion on the radially inner side of the teeth 412D. The lower notch 82D is recessed radially outward from the radially inner end surface of the tooth 412D, recessed upward from the lower surface of the tooth 412D, and spans the entire width of the distal end portion of the teeth 412D on the radially inner side. It extends in the circumferential direction.

  On the other hand, in the example of FIG. 7, the upper damping member 441D has an upper base portion 911D and an upper leg portion 912D. The upper base portion 911D is a disk-shaped portion that is disposed perpendicular to the axial direction. The upper base portion 911D has a circular hole 910D for passing the shaft at the center thereof. The upper leg portion 912D extends downward in the axial direction from the outer peripheral portion of the upper base portion 911D. The shape of the upper leg portion 912D is a cylindrical shape centered on the central axis. The lower end portion of the upper leg portion 912D is accommodated in the upper cutout 81D. Thereby, the lower end part of upper leg part 912D contacts the surface which comprises upper notch 81D of teeth 412D.

  In the example of FIG. 7, the lower vibration control member 442D includes a lower base portion 921D and a lower leg portion 922D. The lower base 921D is a disk-shaped portion arranged perpendicular to the axial direction. The lower base 921D has a circular hole 920D for passing the shaft in the center thereof. The lower leg portion 922D extends axially upward from the outer peripheral portion of the lower base portion 921D. The shape of the lower leg portion 922D is a cylindrical shape centered on the central axis. The upper end portion of the lower leg portion 922D is accommodated in the lower notch 82D. Thereby, the upper end part of lower leg part 922D contacts the surface which comprises lower notch 82D of teeth 412D.

  Even in such a structure, when the vibration control member 44D comes into contact with each tooth 412D, a static frictional force is generated between the teeth 412D and the vibration control member 44D. For this reason, the vibration of the teeth 412D during driving of the motor can be suppressed. In particular, if the upper leg portion 912D and the lower leg portion 922D are press-fitted into the upper notch 81D and the lower notch 82D, each tooth 412D receives pressure toward the radially outer side from the vibration control member 44D. Thereby, the vibration of each tooth 412D is further suppressed. As a result, vibration and noise during driving of the motor are further reduced.

  Each of the plurality of teeth 412D may have a groove recessed downward in the axial direction on the upper end surface in the axial direction instead of the upper notch 81D. And the lower end part of upper leg part 912D of upper damping member 441D may fit into the slot concerned. Each of the plurality of teeth 412D may have a groove recessed in the axially upper side on the lower end surface in the axial direction instead of the lower notch 82D. And the upper end part of lower leg part 922D of the lower damping member 442D may fit in the said groove | channel. If it does in this way, the contact area of upper leg part 912D and lower leg part 922D, and teeth 412D will increase. Thereby, the vibration of the teeth 412D can be further suppressed.

  Moreover, you may provide the through-hole extended in an axial direction in each teeth 412D. And the lower end part of upper leg part 912D of upper damping member 441D and the upper end part of lower leg part 922B of lower damping member 442B may fit in the penetration hole.

  Regardless of the structure of the above-described embodiment and modification, either one of the vibration control member and the tooth is provided with a convex portion protruding in the axial direction, and the other groove is recessed in the axial direction on the other side of the vibration control member and the tooth. May be provided. And the said convex part may fit in the said groove | channel. The convex part and the concave part may be annular or may be isolated in the circumferential direction.

  Moreover, in said embodiment, the damping member was contacting with the front-end | tip part of the radial inside of teeth. However, the contact portion of the vibration control member with respect to the teeth does not necessarily need to be the tip portion on the radially inner side of the teeth. For example, the vibration control member may contact the vicinity of the center in the radial direction of the teeth.

  In the above embodiment, the upper damping member is in contact with the upper end of the distal end portion on the radially inner side of the teeth, and the lower damping member is in contact with the lower end of the distal end portion on the radially inner side of the teeth. However, any one of the upper damping member and the lower damping member may be omitted. Moreover, the damping member may be in contact with places other than the upper end and the lower end of the teeth.

  Further, in the above-described embodiments and modifications, a so-called inner rotor type motor in which the rotor is positioned radially inward from the stator has been described. However, the motor of the present invention may be a so-called outer rotor type motor in which the rotor is positioned radially outside the stator. In the case of the outer rotor type, the teeth extend radially outward from the core back.

  Further, the plurality of magnets need not necessarily be located on the outer peripheral surface of the rotor core. At least a part of the magnet may be embedded in the rotor core.

  Furthermore, the motor may have a control board that controls energization to the stator. In this case, the control board is electrically connected to the bus bar. Further, the motor may not have the bus bar unit. In this case, the conducting wire is electrically connected to a connector or the like connected to an external power source. Also, when the motor has a control board, the motor may not have the bus bar unit. In this case, the conducting wire is electrically connected to the control board without going through the bus bar unit.

  Moreover, about the detailed shape of each member, you may differ from the shape shown by each figure of this application. Moreover, you may combine suitably each element which appeared in said embodiment and modification in the range which does not produce inconsistency.

  The present invention can be used for a stator and a motor.

DESCRIPTION OF SYMBOLS 1 Motor 2 Stationary part 3 Rotating part 9 Central axis 21 Housing 21B Case 22 Stator 23 Busbar unit 24 Lower bearing part 25 Upper bearing part 31 Shaft 32 Rotor 41, 41A, 41B, 41C, 41D Stator core 42 Insulator 43 Coil 44, 44A , 44B, 44C, 44D Damping member 61 Rotor core 62 Magnet 71 First contact portion 72 Second contact portion 81A, 81B, 81D Upper notch 82A, 82B, 82D Lower notch 411, 411C Core back 412, 412A, 412B, 412C, 412D Teeth 441, 441A, 441B, 441C, 441D Upper damping member 442, 442A, 442B, 442C, 442D Lower damping member 911B, 911D Upper base 912B, 912D Upper leg 921B, 92 D under the base 922B, 922D lower leg portion 931C first ring portion 932C second ring portion 933C extending portion

Claims (18)

A stator used in a motor,
A magnetic stator core;
A non-magnetic damping member that contacts the stator core;
Have
The stator core is
An annular core back centered on a central axis extending vertically;
A plurality of teeth extending radially from the core back;
Have
The damping member is a stator that contacts each of the plurality of teeth. The stator according to claim 1,
The damping member is a stator having an annular shape in a top view. The stator according to claim 1,
The damping member is a stator having an arc shape in a top view. The stator according to any one of claims 1 to 3, wherein
The said damping member is a stator which contacts each radial front-end | tip of these teeth. The stator according to any one of claims 1 to 4, wherein
The damping member is
A first contact portion in contact with an axial end surface of the tooth;
A second contact portion that contacts a radial end surface of the tooth;
Having a stator. The stator according to claim 5,
The first contact portion is annular;
The second contact portion is a stator that protrudes in an axial direction from a radial end portion of the first contact portion. The stator according to any one of claims 1 to 4, wherein
The teeth have a notch extending in the circumferential direction at the radial tip,
A stator in which a part of the damping member is accommodated in the notch. The stator according to any one of claims 1 to 4, wherein
The damping member is
An annular first ring portion;
A plurality of extending portions extending in the radial direction along the teeth from the first ring portion and having the same shape as the teeth in plan view;
Have
A stator in which at least one of the first ring portion and the extending portion is fixed to the stator core. The stator according to claim 8, wherein
The damping member is
A stator further comprising a second ring portion extending in the circumferential direction along the core back. The stator according to any one of claims 1 to 4, wherein
The damping member is
A base having a circular hole in the center and arranged perpendicular to the axial direction;
Legs extending axially from the base,
Have
A stator in which the legs contact the teeth. The stator according to claim 10, wherein
The leg is a stator having a cylindrical shape centered on the central axis. The stator according to claim 10 or 11, wherein
The teeth have a groove recessed in the axial direction on an end surface in the axial direction,
A stator in which an end in an axial direction of the leg portion is fitted in the groove. The stator according to any one of claims 1 to 4, wherein
The damping member has a cylindrical leg centered on the central axis,
The teeth have a groove recessed in the axial direction on an end surface in the axial direction,
A stator in which an end in an axial direction of the leg portion is fitted in the groove. The stator according to any one of claims 1 to 4, wherein
Either one of the vibration control member and the teeth has a convex portion protruding in the axial direction,
The other of the vibration control member and the teeth has a groove recessed in the axial direction,
A stator in which the convex portion fits in the groove. The stator according to any one of claims 1 to 14,
The damping member is a stator made of metal. The stator according to claim 15, wherein
The damping member is a stator made of aluminum, an aluminum alloy, or stainless steel. The stator according to any one of claims 1 to 16, wherein
The teeth are stators extending radially inward from the core back. A stator according to any one of claims 1 to 17,
A rotor supported to be rotatable about the central axis with respect to the stator;
Having a motor.