JP2013042633A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure which enables a bus bar holder to be positioned in the axial direction and also enables a claw part and a receiving part to be arranged without causing unnecessary stress in the bus bar holder or an insulator even when an axial dimension error occurs in the bus bar holder or the insulator in a motor having a bus bar.SOLUTION: A bus bar holder 232A holding a bus bar 231A has an annular holder body part 60A and a first leg part 61A and a second leg part 62A which extend downward from the holder body part. The first leg part 61A has a claw part 611A protruding in the lateral direction. An upper surface of the claw part 611A faces a lower surface of a receiving part 521A provided at an insulator in the axial direction through a gap. Thus, the bus holder 232A is restricted from moving upward by the claw part 611A and the receiving part 521A of the insulator. On the other hand, a lower end part of the second leg part 62A is in contact with a teeth 512A or the insulator 52A.

Description

  The present invention relates to a motor.

2. Description of the Related Art Conventionally, a structure is known in which conductive parts called wiring boards or bus bars are arranged in the vicinity of a motor coil, and the coil and an external power source are electrically connected via the parts. For example, Japanese Patent No. 4350972 describes a structure in which a wiring board forming a coil terminal circuit is mounted on the upper end side of a stator of an electric motor (paragraph 0020, FIG. 1). The wiring board of the publication has a configuration in which three ring-shaped differential terminal members are integrated with a mold resin (paragraph 0022). Moreover, the wiring board of the publication has a plurality of terminal pieces to which the winding ends of the coils are connected and external connection terminals (paragraphs 0023 to 0024).
Japanese Patent No. 4350972

  A plurality of hooks that can be elastically deformed are provided on the outer peripheral portion of the wiring board of Japanese Patent No. 4350972. The wiring board and the insulator fitted in the stator are fixedly held to each other by the hook (paragraph 0025). However, in such a structure, if the hook claw and the hook receiver on the insulator side are designed to come into contact with each other, unnecessary stress is generated in both members due to the dimensional error of the wiring board or the insulator. You may not be able to join. On the other hand, if the hook claw and the hook receiver on the insulator side are designed to be separated from each other, the wiring board cannot be accurately positioned only by engaging the hook.

  An object of the present invention is to provide a motor having a bus bar, in which the bus bar holder can be positioned in the axial direction, and even when an axial dimensional error occurs in the bus bar holder or the insulator, unnecessary stress is generated in both members. And providing a structure in which the claw portion and the receiving portion can be arranged.

  An exemplary first invention of the present application includes a stationary part and a rotating part that rotates with respect to the stationary part about a central axis that extends vertically, and the stationary part is arranged around the central axis. A plurality of teeth, an insulator attached to the teeth, a coil composed of a conductive wire wound around the insulator, and a coil disposed above the coil and electrically connected to an end of the conductive wire A bus bar having a plurality of terminals; and a resin-made bus bar holder for holding the bus bar, the bus bar holder having an annular holder main body portion and a first leg portion extending downward from the holder main body portion. And the second leg part, the first leg part has a claw part projecting sideways, and the holder body part is a through hole extending in the axial direction above the claw part. Of the nail portion The surface, the lower surface of the receiving portion provided in the insulator is axially opposed via the gap, the lower end portion of the second leg is a contact with the motor on the teeth or the insulator.

  An exemplary second invention of the present application includes a stationary part and a rotating part that rotates with respect to the stationary part about a central axis that extends vertically, and the stationary part is arranged around the central axis. A plurality of teeth, an insulator attached to the teeth, a coil composed of a conductive wire wound around the insulator, and a coil disposed above the coil and electrically connected to an end of the conductive wire A bus bar having a plurality of terminals; and a resin bus bar holder for holding the bus bar, wherein the bus bar holder has an annular holder main body and a plurality of legs extending downward from the holder main body. And the leg portion includes a lower end portion that comes into contact with the teeth or the insulator, and a claw portion that protrudes laterally, and the holder main body portion is located above the claw portion. A has a through hole extending in the axial direction, and the upper surface of the claw portion, and the lower surface of the receiving portion provided in the insulator is a motor facing the axial direction via a clearance.

  According to the first exemplary invention of the present application, the bus bar holder is positioned in the axial direction by the contact between the teeth or the insulator and the second leg. Further, the upward movement of the bus bar holder is restricted by the claw portion of the first leg portion and the receiving portion of the insulator. Further, even if a dimensional error in the axial direction occurs in the bus bar holder or the insulator, the claw portion and the receiving portion can be arranged without generating unnecessary stress on both members.

  According to the second exemplary invention of the present application, the bus bar holder is positioned in the axial direction by the contact between the teeth or the insulator and the leg portion. Further, the upward movement of the bus bar holder is restricted by the claw portion and the receiving portion of the insulator. Further, even if a dimensional error in the axial direction occurs in the bus bar holder or the insulator, the claw portion and the receiving portion can be arranged without generating unnecessary stress on both members.

FIG. 1 is a longitudinal sectional view of a motor. FIG. 2 is a longitudinal sectional view of the motor. FIG. 3 is a perspective view of the bus bar unit. FIG. 4 is a bottom view of the bus bar unit. FIG. 5 is a partial longitudinal sectional view of the motor in the vicinity of the bus bar unit. FIG. 6 is a partial longitudinal sectional view of the motor in the vicinity of the bus bar unit. FIG. 7 is a partial longitudinal sectional view of the motor in the vicinity of the first leg portion. FIG. 8 is a horizontal sectional view of the first leg. FIG. 9 is a partial longitudinal sectional view of the motor in the vicinity of the second leg. FIG. 10 is a view of the state when the first leg is assembled to the insulator as seen from the inside in the radial direction. FIG. 11 is a view of the state when the second leg portion is arranged on the top of the tooth as viewed from the inside in the radial direction. FIG. 12 is a partial longitudinal sectional view of the motor in the vicinity of the bus bar unit.

  Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the following, the shape and positional relationship of each part will be described with the direction along the central axis of the motor as the vertical direction and the bus bar side as the top with respect to the coil. However, this defines the vertical direction for the convenience of explanation, and does not limit the direction when the motor according to the present invention is used.

<1. Motor according to one embodiment>
FIG. 1 is a longitudinal sectional view of a motor 1A according to an embodiment. The motor 1A includes a stationary part 2A and a rotating part 3A. The rotating part 3A rotates with respect to the stationary part 2A around the central axis 9A.

  The stationary part 2A has a plurality of teeth 512A, an insulator 52A, a coil 53A, a bus bar 231A, and a bus bar holder 232A. The plurality of teeth 512A are arranged around the central axis 9A. The insulator 52A is attached to the tooth 512A. The coil 53A is configured by a conductive wire wound around the insulator 52A. Bus bar 231A is arranged above coil 53A. Bus bar 231A has a plurality of terminals 233A that are electrically connected to the ends of the conductive wires. The bus bar holder 232A is a resin member that holds the bus bar 231A.

  The bus bar holder 232A has an annular holder body 60A, a first leg 61A, and a second leg 62A. The first leg portion 61A and the second leg portion 62A extend downward from the holder main body portion 60A. 61 A of 1st leg parts have the claw part 611A which protrudes toward a side. The holder body 60A has a through hole 602A extending in the axial direction above the claw 611A.

As shown in FIG. 1, the upper surface of the claw portion 611A and the lower surface of the receiving portion 521A provided on the insulator 52A are opposed to each other in the axial direction with a gap 71A. For this reason, upward movement of the bus bar holder 232A is restricted by the claw portion 611A of the first leg portion 61A and the receiving portion 521A of the insulator 52A. Further, even if a dimensional error in the axial direction occurs in the bus bar holder 232A or the insulator 52A, the claw portion 611A and the receiving portion 521A can be arranged without causing unnecessary stress on both members.

  On the other hand, the lower end portion of the second leg portion 62A is in contact with the tooth 512A. Thereby, the bus bar holder 232A is positioned in the axial direction. Note that the lower end portion of the second leg portion 62A may be in contact with the insulator 52A, whereby the bus bar holder 232A may be positioned in the axial direction.

<2. More specific embodiment>
<2-1. Overall configuration of motor>
Subsequently, a more specific embodiment of the present invention will be described.

  The motor 1 according to the present embodiment is mounted on an automobile and used to generate a driving force for power steering. However, the motor of the present invention may be used for other known applications. For example, the motor of the present invention may be used as a drive source for another part of an automobile, for example, an engine cooling fan. The motor of the present invention may be mounted on home appliances, OA equipment, medical equipment, etc., and generate various driving forces.

  FIG. 2 is a longitudinal sectional view of the motor 1 according to the present embodiment. As shown in FIG. 2, the motor 1 includes a stationary part 2 and a rotating part 3. The stationary part 2 is fixed to the frame of the automobile. 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, an armature 22, a bus bar unit 23, a sensor unit 24, a lower bearing part 25, and an upper bearing part 26.

  The housing 21 includes a cylindrical member 41, a bottom member 42, and a lid member 43. The cylindrical member 41 is a substantially cylindrical member that extends in the axial direction (the direction along the central axis; the same applies hereinafter) outside the armature 22 in the radial direction (the direction orthogonal to the central axis; the same applies hereinafter). The armature 22, the bus bar unit 23, a rotor core 32 described later, and a plurality of rotor magnets 33 described later are accommodated inside the cylindrical member 41 in the radial direction.

  The bottom member 42 extends in the radial direction below the armature 22. The outer peripheral portion of the bottom member 42 is fixed to the lower portion of the cylindrical member 41. A lower annular holding portion 421 for holding the lower bearing portion 25 is provided at the center of the bottom member 42. The lid member 43 extends in the radial direction above the armature 22 and the bus bar unit 23. The outer peripheral portion of the lid member 43 is fixed to the cylindrical member 41. In the center of the lid member 43, an upper annular holding portion 431 for holding the upper bearing portion 26 is provided.

  The armature 22 has a stator core 51, an insulator 52, and a coil 53. The stator core 51 is made of a laminated steel plate in which a plurality of electromagnetic steel plates are laminated in the axial direction, for example. The stator core 51 includes an annular core back 511 and a plurality of teeth 512 projecting radially inward from the core back 511. The core back 511 is fixed to the inner peripheral surface of the cylindrical member 41 of the housing 21. The plurality of teeth 512 are arranged at substantially equal intervals in the circumferential direction.

  The insulator 52 is made of a resin that is an insulator and is attached to the teeth 512. The insulator 52 is provided for each tooth 512. Surfaces other than the end surface on the radially inner side of each tooth 512 are covered with an insulator 52. The coil 53 is composed of a conductive wire wound around the insulator 52. The insulator 52 prevents the teeth 512 and the coil 53 from being electrically short-circuited by being interposed between the teeth 512 and the coil 53.

  The bus bar unit 23 is attached to the upper part of the armature 22. The coil 53 and the external power source are electrically connected via the bus bar unit 23. The bus bar unit 23 of the present embodiment includes four arc-shaped bus bars 231 made of a conductor and a resin bus bar holder 232 that holds the bus bars 231. The four bus bars 231 respectively correspond to the U phase, V phase, W phase, and ground line of the three-phase alternating current. Further, the four bus bars 231 are held in a state separated from each other by being held by the bus bar holder 232.

  The four bus bars 231 have a plurality of first terminals 233 projecting outward from the outer peripheral surface of the bus bar holder 232 in the radial direction above the coil 53. The ends of the conductive wires constituting each coil 53 are welded to the first terminals 233 of the corresponding bus bars 231. Thereby, the conducting wire and the first terminal 233 are electrically connected. Each of the four bus bars 231 has a second terminal 234 that protrudes upward from the upper surface of the bus bar holder 232. The second terminal 234 is electrically connected to an external power source.

  The sensor unit 24 is disposed above a sensor magnet 35 to be described later. The sensor unit 24 includes a circuit board 241 extending in a direction orthogonal to the central axis 9 and a hall element 242 provided on the lower surface of the circuit board 241. The circuit board 241 is fixed to the cylindrical member 41 above the lid member 43. The hall element 242 is a magnetic sensor that detects the magnetic flux of the sensor magnet 35. The detection signal from the hall element 242 is used to detect the rotational position and the rotational speed of the rotating unit 3.

  The lower bearing portion 25 and the upper bearing portion 26 are mechanisms that rotatably support the shaft 31 on the rotating portion 3 side. For the lower bearing portion 25 and the upper bearing portion 26 of the present embodiment, ball bearings that rotate the outer ring and the inner ring relative to each other via a sphere are used. However, other types of bearings such as a slide bearing and a fluid bearing may be used instead of the ball bearing.

  The outer ring 251 of the lower bearing portion 25 is fixed to the lower annular holding portion 421 of the bottom member 42. Further, the outer ring 261 of the upper bearing portion 26 is fixed to the upper annular holding portion 431 of the lid member 43. On the other hand, the inner rings 252 and 262 of the lower bearing portion 25 and the upper bearing portion 26 are fixed to the shaft 31. For this reason, the shaft 31 is rotatably supported with respect to the housing 21.

  The rotating unit 3 according to the present embodiment includes a shaft 31, a rotor core 32, a plurality of rotor magnets 33, a yoke 34, and a sensor magnet 35.

  The shaft 31 is a substantially cylindrical member that extends vertically along the central axis 9. The shaft 31 rotates around the central axis 9 while being supported by the lower bearing portion 25 and the upper bearing portion 26 described above. The shaft 31 has a first end 311 that protrudes upward from the lid member 43 of the housing 21. The inner peripheral portion of the yoke 34 is fixed to the first end portion 311. The shaft 31 has a second end 312 that protrudes downward from the bottom member 42 of the housing 21. The second end 312 is connected to a steering device for an automobile via a power transmission mechanism such as a gear.

  The rotor core 32 and the plurality of rotor magnets 33 are disposed radially inside the armature 22 and the bus bar unit 23 and rotate together with the shaft 31. The rotor core 32 is a substantially cylindrical member fixed to the shaft 31. The rotor core 32 is made of, for example, a laminated steel plate in which a plurality of electromagnetic steel plates are laminated in the axial direction. The plurality of rotor magnets 33 are fixed to the outer peripheral surface of the rotor core 32 with, for example, an adhesive. The radially outer surface of each rotor magnet 33 is a magnetic pole surface facing the radially inner end surface of the teeth 512. The plurality of rotor magnets 33 are arranged at equal intervals in the circumferential direction so that N-pole magnetic pole faces and S-pole magnetic pole faces are alternately arranged.

  Instead of the plurality of rotor magnets 33, one annular rotor magnet in which N poles and S poles are alternately magnetized in the circumferential direction may be used.

  When a drive current is applied to the coil 53 from the external power source via the bus bar 231, a radial magnetic flux is generated in the plurality of teeth 512 of the stator core 51. Then, circumferential torque is generated by the action of magnetic flux between the teeth 512 and the rotor magnet 33. As a result, the rotating unit 3 rotates about the central axis 9 with respect to the stationary unit 2.

  The sensor magnet 35 is fixed to the upper surface of a yoke 34 made of a magnetic material. The yoke 34 extends in the radial direction above the lid member 43 of the housing 21. The inner peripheral portion of the yoke 34 is fixed to the first end 311 of the shaft 31. The sensor magnet 35 is a substantially annular magnet. The upper surface of the sensor magnet 35 faces the hall element 242 in the axial direction. Further, N poles and S poles are alternately magnetized on the upper surface of the sensor magnet 35 in the circumferential direction.

<2-2. About Bus Bar Unit Configuration>
Next, a more detailed structure of the bus bar unit 23 will be described. FIG. 3 is a perspective view of the bus bar unit 23. FIG. 4 is a bottom view of the bus bar unit 23. 5 and 6 are partial longitudinal sectional views of the motor 1 in the vicinity of the bus bar unit 23. FIG. As described above, the bus bar unit 23 according to the present embodiment includes the four bus bars 231 and the bus bar holder 232 that holds the bus bars 231.

  The bus bar unit 23 of the present embodiment is obtained by so-called insert molding. That is, when manufacturing the bus bar unit 23, first, the four bus bars 231 are arranged inside the mold for resin molding. Then, resin flows into the mold, and the resin is cooled and cured. Thereafter, the cured resin is released from the mold. Thereby, the bus bar holder 232 holding the four bus bars 231 is obtained.

  The bus bar holder 232 has an annular holder main body 60, three first leg parts 61, and six second leg parts 62. The three first leg parts 61 and the six second leg parts 62 extend downward from the holder main body part 60. In order to stabilize the posture of the bus bar holder 232 relative to the stator core 51 and the insulator 52, the three first leg portions 61 are arranged at substantially equal intervals in the circumferential direction. Further, the six second leg portions 62 are also arranged at substantially equal intervals in the circumferential direction for the same purpose.

  In the present embodiment, the first leg portion 61 and the second leg portion 62 extend downward from the lower surface near the inner peripheral portion of the holder main body portion 60. Therefore, the first leg portion 61 and the second leg portion 62 are not interposed between the coil 53 and the first terminal 233. For this reason, it is easy to extend the conducting wire from the coil 53 to the first terminal 233. In addition, it is easy to perform a welding operation of the lead wire to the first terminal 233.

  As shown in FIGS. 3 and 4, the holder main body 60 has an annular step 601 that protrudes radially inward from the vicinity of the lower end of the inner peripheral surface. The first leg portion 61 extends downward from the lower surface of the step portion 601. Further, the holder main body 60 has an arc-shaped convex portion 603 that projects downward from the lower surface of the stepped portion 601. Then, the second leg portion 62 extends further downward from the convex portion 603. By providing such a convex portion 603, the resin can easily flow to the lower end portion of the second leg portion 62 during the above-described resin molding. As a result, the second leg portion 62 can be accurately molded.

  5 and 7 are partial longitudinal sectional views of the motor 1 in the vicinity of the first leg portion 61. As shown in FIGS. 5 and 7, a claw portion 611 that protrudes outward in the radial direction is provided at the lower end portion of the first leg portion 61. On the other hand, a receiving portion 521 corresponding to the claw portion 611 is provided at an end edge portion on the radially inner side of the insulator 52. The upper surface of the claw part 611 and the lower surface of the receiving part 521 are opposed to each other in the axial direction. For this reason, when the bus bar holder 232 tries to move upward, the upper surface of the claw portion 611 and the lower surface of the receiving portion 521 come into contact with each other. Thereby, the upward movement of the bus bar holder 232 is restricted.

  Further, the step portion 601 of the holder main body portion 60 has three through holes 602. Each through hole 602 penetrates the step portion 601 in the axial direction above the claw portion 611. During the insert molding described above, a part of the mold is disposed in the through hole 602. And the upper surface of the nail | claw part 611 is shape | molded by the lower surface of the said part of a metal mold | die. In the present embodiment, a through hole 602 is formed in a stepped portion 601 having a smaller axial dimension than other portions of the holder main body 60. For this reason, the axial length of the part arrange | positioned in the through-hole 602 of a metal mold | die can be shortened. Thereby, the material cost of a metal mold | die can be suppressed. Further, if the length of the portion of the mold in the axial direction is shortened, the strength of the mold is increased compared to the case where the portion is long. For this reason, the service life of the mold increases.

  The lower surface of the nail | claw part 611 is inclined so that the distance with the upper surface of the teeth 512 may become large as it goes to the edge part of a radial direction outer side. On the other hand, the upper surface of the receiving portion 521 is inclined so as to become lower toward the radially inner end. When the claw portion 611 is assembled to the receiving portion 521, the bus bar holder 232 is moved downward while the lower surface of the claw portion 611 and the upper surface of the receiving portion 521 are brought into contact with each other. At this time, the first leg portion 61 descends while bending inward in the radial direction. And if the upper surface of the nail | claw part 611 reaches | attains below from the lower surface of the receiving part 521, the bending of the 1st leg part 61 will be eliminated and it will be in the state of FIG. 5 and FIG.

  As shown in FIG. 7, the upper surface of the claw portion 611 and the lower surface of the receiving portion 521 are opposed to each other in the axial direction with a gap 71 therebetween. For this reason, even if an axial dimensional error occurs in the bus bar holder 232 or the insulator 52, the claw portion 611 and the receiving portion 521 can be arranged without causing unnecessary stress on both members.

  In the present embodiment, the lower end portion of the first leg portion 61 and the upper surface of the tooth 512 are opposed to each other in the axial direction via the gap 72. For this reason, even if a dimensional error in the axial direction occurs in the bus bar holder 232 or the stator core 51, the first leg portion 61 and the teeth 512 can be disposed without causing unnecessary stress on both members.

  Furthermore, in the present embodiment, the radially outer surface of the first leg portion 61 and the radially inner end of the receiving portion 521 of the insulator 52 are opposed to each other in the radial direction via the gap 73. Yes. For this reason, even if a dimensional error in the radial direction occurs in the bus bar holder 232 or the insulator 52, the first leg portion 61 and the receiving portion 521 can be arranged without causing unnecessary stress on both members.

  FIG. 8 is a horizontal sectional view of the first leg 61 viewed from the position XIII-XIII in FIG. As shown in FIG. 8, the first leg portion 61 of the present embodiment is formed in a substantially rectangular shape in a cross section orthogonal to the central axis 9. That is, the radially inner surface 612 of the first leg portion 61 is molded into a substantially flat surface rather than a part of the cylindrical inner peripheral surface of the bus bar holder 232. If it does in this way, the 1st leg part 61 will become easy to bend to radial inside. As a result, the claw portion 611 can be more easily assembled to the receiving portion 521 of the insulator 52.

  In the present embodiment, the radially inner surface 612 of the first leg portion 61 is arranged at a position slightly recessed outward from the cylindrical inner peripheral surface of the step portion 601 of the bus bar holder 232. Thus, if the surface on the radially inner side of the first leg portion 61 is disposed at the same radial position as the inner peripheral surface of the holder main body portion 60 or on the radially outer side, the first leg portion 61 and Contact with the rotor magnet 33 on the rotating unit 3 side can be suppressed.

  Moreover, as shown in FIG. 8, in this embodiment, the 1st leg part 61 and the convex part 603 are spaced apart in the circumferential direction. For this reason, the 1st leg part 61 becomes easy to bend to the radial direction inner side rather than the case where the 1st leg part 61 and the convex part 603 are continuing in the circumferential direction.

  6 and 9 are partial longitudinal sectional views of the motor 1 in the vicinity of the second leg portion 62. As shown in FIGS. 6 and 9, the lower end portion of the second leg portion 62 is positioned below the lower end portion of the first leg portion 61. The lower end portion of the second leg portion 62 is in contact with the upper surface of the tooth 512. Thereby, the position of the bus bar holder 232 in the axial direction with respect to the stator core 51 is determined.

  At the time of manufacturing the motor 1, the conductive wire is extended from the coil 53 without loosening while the lower end portion of the second leg portion 62 is in contact with the upper surface of the tooth 512, and is welded to the first terminal 233 of the bus bar 231. Thereby, the upward movement of the bus bar 231 is prevented. As a result, the lower end portion of the second leg portion 62 and the upper surface of the tooth 512 are maintained in contact with each other. The claw portion 611 and the receiving portion 521 described above prevent separation of the armature 22 and the bus bar holder 232 at least in the manufacturing process before welding the conductive wire to the first terminal 233, and facilitate transport of these members. Plays a role.

  Further, as shown in FIG. 9, in the present embodiment, the radially outer surface of the second leg portion 62 and the radially inner end portion of the receiving portion 521 of the insulator 52 are arranged with a diameter 74 through a gap 74. Opposite direction. For this reason, even if a dimensional error in the radial direction occurs in the bus bar holder 232 or the insulator 52, the second leg portion 62 and the receiving portion 521 can be disposed without causing unnecessary stress on both members.

  The first leg portion 61 is more flexible inward in the radial direction as the radial dimension d1 of the proximal end portion shown in FIG. 7 is smaller. If the flexibility of the first leg portion 61 is improved, the claw portion 611 of the first leg portion 61 can be easily assembled to the receiving portion 521 of the insulator 52. On the other hand, the strength of the second leg 62 increases as the radial dimension d2 of the base end shown in FIG. 9 increases. If the strength of the second leg portion 62 is improved, the bus bar holder 232 is supported more stably with respect to the stator core 51. Further, when the radial dimension d2 of the base end portion of the second leg portion 62 is increased, the resin can be more easily flowed to the lower end portion of the second leg portion 62 at the time of insert molding. Based on these viewpoints, in the present embodiment, the radial dimension d1 of the proximal end portion of the first leg portion 61 is set to be smaller than the radial dimension d2 of the proximal end portion of the second leg portion 62. .

  FIG. 10 is a view of the state when the first leg 61 is assembled to the insulator 52 as seen from the radially inner side. FIG. 11 is a view of the state when the second leg portion 62 is disposed on the top of the tooth 512, as viewed from the inside in the radial direction. In the present embodiment, the circumferential width w1 of the first leg portion 61 is set smaller than the circumferential width w2 of the second leg portion 62 based on the same viewpoint as the radial dimensions d1 and d2. Yes. Thereby, the flexibility of the 1st leg part 61 and the intensity | strength of the 2nd leg part 62 are ensured. Moreover, the fluidity | liquidity of the resin to the lower end part of the 2nd leg part 62 at the time of insert molding is also ensured.

  The plurality of insulators 52 are provided for each tooth 512. Each insulator 52 is provided with a notch 522 into which the first leg portion 61 or the second leg portion 62 is fitted. The notch 522 is recessed outward in the radial direction on the radially inner surface of the upper portion of the insulator 52. In the present embodiment, the circumferential width w <b> 3 of the notch 522 is substantially equal to the circumferential width w <b> 2 of the portion that fits into the notch 522 of the second leg portion 62. Therefore, the circumferential width w1 of the portion of the first leg 61 that fits into the notch 522 is smaller than the circumferential width w3 of the notch 522. In the present embodiment, the bus bar holder 232 is positioned in the circumferential direction with respect to the insulator 52 by the notch 522 and the second leg portion 62.

  Thus, in this embodiment, the notch 522 of the same dimension is provided in all the insulators 52. As shown in FIGS. 10 and 11, in the present embodiment, receiving portions 521 are provided inside the notches 522 of all the insulators 52. That is, the receiving portion 521 is provided not only on the insulator 52 corresponding to the first leg portion 61 but also on the insulator 52 corresponding to the second leg portion 62 and the insulator 52 into which the leg portion is not inserted. As described above, if the shapes of the plurality of insulators 52 are made equal, the insulators 52 may be arranged interchangeably. For this reason, the assembly work of the motor 1 becomes easy and the manufacturing cost of the insulator 52 is also suppressed.

<3. Modification>
As mentioned above, although exemplary embodiment of this invention was described, this invention is not limited to said embodiment.

  For example, a flat plate portion that extends radially inward along the upper surface of the tooth may be provided in the lower portion of the receiving portion of the insulator. And the lower end part of a 2nd leg part may contact | abut on the upper surface of the said flat plate part. Even in such a configuration, the bus bar holder is positioned in the axial direction by the contact between the insulator and the second leg.

  However, if the second leg portion is brought into direct contact with the upper surface of the tooth as in the above embodiment, the influence of the dimensional error of the insulator can be eliminated. Therefore, it is more preferable from the viewpoint of the positioning accuracy of the bus bar holder that the second leg portion is in direct contact with the upper surface of the tooth as in the above embodiment.

  The first leg portion and the second leg portion may extend from the vicinity of the inner peripheral portion of the holder main body portion or may extend from other parts of the holder main body portion as in the above-described embodiment. Moreover, the nail | claw part may protrude toward the radial inside from the lower end part of the 1st leg part, and may protrude in the circumferential direction. In any case, it is only necessary that the receiving portion is formed on the insulator side so as to correspond to the direction in which the claw portion protrudes.

  The numbers of the first leg portions and the second leg portions may be different from those in the above embodiment. However, in order to stabilize the posture of the bus bar holder with respect to the stator core and the insulator, it is preferable that at least three first leg portions and two second leg portions are provided. Further, if the number of the second leg portions is larger than the number of the first leg portions, the number of the first leg portions that do not contact the stator core and the insulator is suppressed, and the amount of resin used is reduced, while the posture of the bus bar holder is reduced. Can be stabilized.

  The first leg and the second leg do not necessarily have to be arranged at equal intervals in the circumferential direction. Moreover, the notch which a 1st leg part or a 2nd leg part fits may be provided in the position remove | deviated from the center of the circumferential direction of an insulator. Moreover, a single insulator may be attached to the plurality of teeth.

  Further, the number of bus bars held by the bus bar holder may be different from the above embodiment. For example, the bus bar corresponding to the ground line may be held by a part other than the bus bar holder, and only three bus bars corresponding to the U phase, the V phase, and the W phase may be held by the bus bar holder.

  Moreover, although the structure of said bus bar respond | corresponds to a star connection, the delta connection may be sufficient as the connection method of an AC circuit. In the case of delta connection, the bus bar corresponding to the ground line is omitted, and only three bus bars corresponding to the U phase, the V phase, and the W phase are held in the bus bar holder.

  In the above embodiment, three-phase alternating current is used as the drive current. However, the motor of the present invention may use a single-phase or two-phase drive current. The motor of the present invention may be an SR motor (switched reluctance motor) that does not have a magnet.

  The bus bar holder may have a plurality of legs that are not distinguished from the first leg and the second leg. For example, the bus bar holder may have a plurality of leg portions 63B as shown in FIG. In the example of FIG. 12, the lower end portion of the leg portion 63B is in contact with the tooth 512B. Thereby, the bus bar holder 232B is positioned in the axial direction. Further, a claw portion 611B is provided on the leg portion 63B. And the upper surface of the nail | claw part 611B and the lower surface of the receiving part 521B provided in the insulator 52B are facing the axial direction. Thereby, the upward movement of the bus bar holder 232B is restricted. In addition, a gap is provided between the upper surface of the claw portion 611B and the lower surface of the receiving portion 521B. For this reason, even if a dimensional error in the axial direction occurs in the bus bar holder 232B or the insulator 52B, the claw portion and the receiving portion can be arranged without causing unnecessary stress on both members.

  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 motor.

DESCRIPTION OF SYMBOLS 1,1A Motor 2,2A Static part 3,3A Rotating part 9,9A Center shaft 21 Housing 22 Armature 23 Bus bar unit 24 Sensor unit 25 Lower bearing part 26 Upper bearing part 31 Shaft 32 Rotor core 33 Rotor magnet 34 York 35 Sensor magnet 41 Cylindrical member 42 Bottom member 43 Lid member 51 Stator core 52, 52A, 52B Insulator 53, 53A Coil 60, 60A Holder body 61, 61A First leg 62, 62A Second leg 63B Leg 231, 231A Bus bar 232 232A, 232B Busbar holder 233 First terminal 233A terminal 234 Second terminal 241 Circuit board 242 Hall element 511 Core back 512, 512A, 512B Teeth 521, 521A, 521B Receiving part 601 Step part 02,602A through hole 603 protruding portions 611,611A, 611B claw portion

Claims (18)

A stationary part;
A rotating part that rotates relative to the stationary part about a central axis extending vertically;
With
The stationary part is
A plurality of teeth arranged around the central axis;
An insulator attached to the teeth;
A coil composed of a conductive wire wound around the insulator;
A bus bar disposed above the coil and having a plurality of terminals electrically connected to an end of the conducting wire;
A resin bus bar holder for holding the bus bar;
With
The bus bar holder is
An annular holder body,
A first leg and a second leg extending downward from the holder body,
Have
The first leg has a claw projecting sideways,
The holder main body has a through hole extending in the axial direction above the claw portion,
The upper surface of the claw portion and the lower surface of the receiving portion provided in the insulator are opposed to each other in the axial direction through a gap,
A motor in which a lower end portion of the second leg portion abuts on the teeth or the insulator. The motor according to claim 1,
The lower end of the second leg is a motor positioned below the lower end of the first leg. The motor according to claim 1 or 2,
The circumferential width of the first leg is smaller than the circumferential width of the second leg. In the motor according to any one of claims 1 to 3,
The radial dimension of the base end of the first leg is smaller than the dimension of the base end of the second leg. In the motor according to any one of claims 1 to 4,
The holder main body portion has an arc-shaped convex portion projecting downward from the lower surface,
A motor in which the second leg portion extends from the convex portion. The motor according to claim 5, wherein
The motor in which the first leg portion and the convex portion are spaced apart from each other in the circumferential direction. In the motor according to any one of claims 1 to 6,
The plurality of terminals protrude radially outward from the outer peripheral surface of the holder main body,
The first leg portion and the second leg portion are motors extending downward from a lower surface in the vicinity of an inner peripheral portion of the holder main body portion. The motor according to claim 7, wherein
The holder main body has an annular stepped portion protruding radially inward from the vicinity of the lower end of the inner peripheral surface,
The first leg portion extends downward from the lower surface of the stepped portion,
The through hole is a motor that penetrates the stepped portion in the axial direction. The motor according to claim 8, wherein
The rotating part is disposed on the radially inner side of the teeth, the insulator, and the bus bar holder,
The motor is arranged such that a radially inner surface of the first leg portion is disposed at the same radial position as the inner peripheral surface of the holder main body portion or at a radially outer side thereof. In the motor according to any one of claims 1 to 9,
The motor whose said 1st leg part is substantially rectangular shape in the cross section orthogonal to a central axis. In the motor according to any one of claims 1 to 10,
A plurality of insulators provided for each of the teeth;
Each of the plurality of insulators is provided with a notch into which the first leg or the second leg is fitted,
A motor in which the circumferential widths of the plurality of notches are substantially the same. The motor according to claim 11, wherein
The circumferential width of the portion that fits into the notch of the first leg is smaller than the circumferential width of the cut,
The motor has a circumferential width substantially equal to a circumferential width of the cutout portion of the second leg portion. The motor according to claim 11 or claim 12,
A motor in which the receiving portion is provided in all of the plurality of insulators. The motor according to any one of claims 1 to 13,
The motor with which the 2nd leg part is in contact with the upper surface of the teeth. The motor according to any one of claims 1 to 14,
A motor in which the radially outer surfaces of the first leg and the second leg are separated from the insulator. The motor according to any one of claims 1 to 15,
The bus bar holder is
A plurality of the first legs arranged at substantially equal intervals in the circumferential direction;
A plurality of the second leg portions arranged at substantially equal intervals in the circumferential direction;
Having a motor. The motor according to claim 16, wherein
The motor in which the number of the second legs is greater than the number of the first legs. A stationary part;
A rotating part that rotates relative to the stationary part about a central axis extending vertically;
With
The stationary part is
A plurality of teeth arranged around the central axis;
An insulator attached to the teeth;
A coil composed of a conductive wire wound around the insulator;
A bus bar disposed above the coil and having a plurality of terminals electrically connected to an end of the conducting wire;
A resin bus bar holder for holding the bus bar;
With
The bus bar holder is
An annular holder body,
A plurality of legs extending downward from the holder body,
Have
The legs are
A lower end contacting the teeth or the insulator;
A claw projecting sideways,
Have
The holder main body has a through hole extending in the axial direction above the claw portion,
The motor with which the upper surface of the said nail | claw part and the lower surface of the receiving part provided in the said insulator are facing the axial direction through the clearance gap.

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