JP2019176615A - motor - Google Patents

Abstract

To provide a motor which enables reduction of noise current flowing through a conductive member.SOLUTION: A motor MT includes a rotation part 1, a stationary part 3 and a conductive member 5. The rotation part 1 rotates around a center axis AX extending in a vertical direction and has a magnet 10. The stationary part 3 has a stator 30 facing the magnet 10 in a radial direction RD. The conductive member 5 is connected directly or indirectly with the stator 30 and pulled out to the outside of the stationary part 3. The stationary part 3 has a conductive member holding part 34 which holds the conductive member 5. The conductive member holding part 34 includes a magnetic material MG in at least a part thereof.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a motor.

  A conventional motor has a bushing. The bushing has a wiring groove that is in contact with the end surfaces constituting the connection holes of the casing and the cover and in which the lead wire is disposed. And the lead wire extended from a board | substrate passes along the wiring groove | channel of a bushing inside a connection hole, and is withdraw | derived to the exterior of a casing (for example, patent document 1).

JP 2017-175897 A

  An object of the present invention is to provide a motor capable of reducing noise current flowing through a conductive member.

  The exemplary motor of the present invention includes a rotating part, a stationary part, and a conductive member. The rotating part rotates around a central axis extending in the vertical direction and has a magnet. The stationary part has a stator facing the magnet in the radial direction. The conductive member is directly or indirectly connected to the stator and is drawn out of the stationary part. The stationary portion includes a conductive member holding portion that holds the conductive member. The conductive member holding part includes a magnetic material at least in part.

  According to the exemplary present invention, it is possible to provide a motor capable of reducing a noise current flowing through a conductive member.

FIG. 1 is a sectional view showing a motor according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view illustrating a part of the lead wire holding portion of the motor according to the first embodiment. FIG. 3 is a perspective view illustrating a lead wire holding portion of the motor according to the first embodiment. FIG. 4 is a cross-sectional view illustrating a part of the lead wire holding portion of the motor according to the first modification of the first embodiment. FIG. 5 is a cross-sectional view illustrating a part of the lead wire holding portion of the motor according to the second modification of the first embodiment. FIG. 6 is a cross-sectional view illustrating a part of a lead wire holding portion of a motor according to a third modification of the first embodiment. FIG. 7 is a cross-sectional view illustrating a part of the lead wire holding portion of the motor according to the fourth modification of the first embodiment. FIG. 8 is a cross-sectional view showing a motor according to Embodiment 2 of the present invention. FIG. 9 is a cross-sectional view illustrating a part of the lead wire holding portion of the motor according to the second embodiment. FIG. 10 is a cross-sectional view showing a motor according to Embodiment 3 of the present invention.

  Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof is not repeated.

  In this specification, for the sake of convenience, the direction of the central axis AX of the motor (see FIG. 1) may be described as the vertical direction. In the drawing, for easy understanding, an X axis, a Y axis, and a Z axis of a three-dimensional orthogonal coordinate system are appropriately described. The positive direction of the Z axis indicates the upward direction, and the negative direction of the Z axis indicates the downward direction. However, the vertical direction, the upward direction, and the downward direction are determined for convenience of explanation and do not need to coincide with the vertical direction. In addition, the vertical direction is merely defined for convenience of explanation, and the direction when using and assembling the motor according to the present invention is not limited. Furthermore, as shown in FIG. 1, a direction parallel to the central axis AX of the motor is simply referred to as “axial direction AD”, and a radial direction and a circumferential direction around the central axis AX of the motor are simply referred to as “radial direction RD”. And “circumferential CD”. In the present specification, the “parallel direction” includes a substantially parallel direction.

(Embodiment 1)
With reference to FIGS. 1-3, the motor MT which concerns on Embodiment 1 of this invention is demonstrated. First, the motor MT will be described with reference to FIG. FIG. 1 is a cross-sectional view showing the motor MT. As shown in FIG. 1, the motor MT includes a rotating part 1, a stationary part 3, and at least one lead wire 5. The lead wire 5 corresponds to an example of “conductive member”.

  In the first embodiment, the motor MT has a plurality of lead wires 5. The lead wire 5 may be a conducting wire having a coating or a conducting wire not having a coating. The coating is constituted by an insulator. Further, the lead wire 5 may include a terminal.

  For example, a drive current for driving the motor MT flows through at least one of the multiple lead wires 5. For example, drive currents having different phases flow through some of the multiple lead wires 5. In addition, a drive current of a detection element that detects the position of the rotating unit 1 and a current indicating a detection result may flow through the lead wire 5. The detection element is, for example, a Hall element that detects the magnetic field intensity using the Hall phenomenon.

  The rotating unit 1 rotates around a central axis AX that extends in the vertical direction. The rotating unit 1 is a so-called rotor. The rotating unit 1 has a magnet 10. The magnet 10 is a permanent magnet, for example. For example, the rotating unit 1 may include a single substantially circular magnet 10 or may include a plurality of magnets 10 arranged in the circumferential direction CD. “Annular” is, for example, “annular”.

  Specifically, the rotating unit 1 is disposed around the central axis AX. The rotating part 1 is arranged on the inner side in the radial direction RD with respect to the stationary part 3. That is, the motor MT is an inner rotor type motor. The rotating unit 1 further includes a rotor yoke 12 and a rotating shaft 14. The rotor yoke 12 is configured by, for example, a laminated steel plate in which electromagnetic steel plates are laminated in the axial direction AD. A magnet 10 is fixed to the outer surface of the rotor yoke 12 in the radial direction RD. Therefore, in the first embodiment, the motor MT is a so-called SPM (Surface Permanent Magnet) motor. The magnet 10 may be embedded in the rotor yoke 12. In other words, the motor MT may be a so-called IPM (Interior Permanent Magnet) motor.

  The rotation shaft 14 is disposed around the central axis AX. The rotating shaft 14 is substantially columnar. The rotating shaft 14 is fixed to the rotor yoke 12. Therefore, the rotating shaft 14 rotates with the rotor yoke 12 and the magnet 10 around the center axis AX.

  The stationary part 3 has a stator 30 facing the magnet 10 in the radial direction RD. The stator 30 is disposed around the central axis AX. Specifically, the stator 30 includes a stator core 300, a plurality of insulators 302, a plurality of coils 304, and a plurality of metal terminals 306.

  The stator core 300 has a substantially annular shape centered on the central axis AX. “Annular” is, for example, “annular”. Each of the insulators 302 is attached to at least a part of the stator core 300. Each of the insulators 302 is disposed between the coil 304 and the stator core 300. Accordingly, each of the coils 304 is attached to the stator core 300 via the insulator 302. The insulator 302 is made of an insulator. Therefore, each of the insulators 302 electrically insulates the stator core 300 and the coil 304. The stator core 300 is made of, for example, a laminated steel plate in which electromagnetic steel plates are laminated in the axial direction AD.

  Specifically, the stator core 300 includes a core back 300a and a plurality of teeth 300b. The core back 300a has a substantially annular shape centered on the central axis AX. “Annular” is, for example, “annular”. The plurality of teeth 300b are arranged at equal intervals along the circumferential direction CD. Each of the plurality of teeth 300b extends from the core back 300a toward the inside in the radial direction RD. A plurality of insulators 302 are attached to the plurality of teeth 300b, respectively. Specifically, the insulator 302 covers both end surfaces of the tooth 300b in the axial direction AD and both surfaces of the circumferential direction CD. Each of the plurality of coils 304 is configured by winding a conductive wire around the plurality of teeth 300 b via the plurality of insulators 302.

  The metal terminal 306 is attached to the insulator 302. For example, the plurality of metal terminals 306 may be attached to one insulator 302. For example, the plurality of metal terminals 306 may be attached to the plurality of insulators 302, respectively. The number of metal terminals 306 is the same as the number of phases of the motor MT. Each of the metal terminals 306 is connected to one conductor drawn from one or more coils 304 corresponding to one phase.

  The stationary part 3 further includes a lead wire holding part 34, a substrate 36, and a housing 38. The lead wire holding part 34 corresponds to an example of a “conductive member holding part”.

  The substrate 36 has a substantially flat plate shape. The substrate 36 is substantially orthogonal to the axial direction AD. The board 36 is a printed board on which wiring is printed, and has various electronic components. The substrate 36 opposes at least a part of the stator 30 and at least a part of the rotating unit 1 in the axial direction AD, and is disposed substantially horizontally.

  The lead wire 5 is electrically connected to the substrate 36. Then, the metal terminal 306 of the stator 30 is electrically connected to the substrate 36. Accordingly, the lead wire 5 is indirectly connected to the stator 30. Further, the lead wire 5 is drawn out of the stationary part 3. Note that the lead wire 5 may be directly connected to the stator 30. For example, the lead wire 5 may be directly connected to the metal terminal 306 of the stator 30.

  The lead wire holding unit 34 holds at least one lead wire 5. In the first embodiment, the lead wire holding unit 34 holds a plurality of lead wires 5. The lead wire holding unit 34 holds, for example, five lead wires 5. The lead wire holding part 34 is a so-called bushing. The lead wire 5 is drawn out of the stationary part 3 from the substrate 36 via the lead wire holding part 34. In the first embodiment, the lead wire holding portion 34 is a member different from the housing 38.

  The housing 38 accommodates at least a part of the rotating unit 1. The housing 38 covers at least a part of the stator 30.

  Specifically, the housing 38 includes a housing body 380 and a cover 381. The housing body 380 corresponds to an example of a “first housing”, and the cover 381 corresponds to an example of a “second housing”.

  The housing body 380 and the cover 381 are disposed along the axial direction AD. The housing body 380 has an opening that is open in the axial direction AD. The housing main body 380 has a substantially bottomed cylindrical shape and is a synthetic resin member. The housing body 380 is obtained by pouring synthetic resin into the mold in which the stator 30 is inserted. That is, the housing body 380 is a resin molded product using the stator 30 as an insert part. Therefore, the stator 30 is fixed to the housing body 380, and at least a part of the stator 30 is covered with the housing body 380. For example, the core back 300a is fixed to the housing body 380, and the outer peripheral surface of the core back 300a is covered with the housing body 380. Further, at least a part of the rotating unit 1 is accommodated in the housing body 380. The cover 381 has a substantially disk shape and is a synthetic resin member. The cover 381 covers the opening at the top of the housing body 380.

  The lead wire holding portion 34 is fixed to the housing 38. Specifically, the lead wire holding part 34 is fixed to the housing body 380. The lead wire holding portion 34 may be fixed to the housing 38 by being sandwiched between the housing main body 380 and the cover 381.

  Next, the lead wire holding portion 34 will be described with reference to FIG. FIG. 2 is a cross-sectional view showing a part of the lead wire holding portion 34. In FIG. 2, the lead wire holding part 34 is viewed from the direction D1 shown in FIG. The direction D1 indicates a direction from the outer side to the inner side in the radial direction RD.

  As shown in FIG. 2, the lead wire holding part 34 includes the magnetic body MG at least in part and holds the lead wire 5. Therefore, according to the first embodiment, the noise current flowing through the lead wire 5 can be reduced by the magnetic field of the magnetic body MG. As a result, it is possible to suppress the magnetic flux generated by the noise current from affecting the electronic circuit inside the motor MT and the electronic equipment outside the motor MT. In other words, in the first embodiment, it is possible to effectively take measures against EMI (Electro-Magnetic Interference) by the lead wire holding part 34 including the magnetic body MG. EMI is a phenomenon in which electromagnetic waves generated by an electronic device generally affect the operation of another electronic device. EMI is so-called electromagnetic interference.

  In addition, according to the first embodiment, the degree of freedom of arrangement of electronic components on the board 36 can be improved as compared with the case where a capacitor or ferrite bead is provided on the board built in the motor to take measures against EMI. That is, it is possible to suppress the placement of electronic components on the substrate 36 from being restricted by EMI countermeasure components such as capacitors and ferrite beads.

  In the first embodiment, the lead wire holding unit 34 holds the lead wire 5 via the magnetic body MG. The magnetic body MG is arranged in a ring shape around the lead wire 5. Therefore, the lead wire 5 is surrounded by the magnetic body MG in the outer peripheral direction D2 of the lead wire 5. As a result, the noise current flowing through the lead wire 5 due to the magnetic field of the magnetic body MG can be further reduced, and EMI countermeasures can be taken more effectively. The “outer peripheral direction D2” indicates a circumferential direction around the lead wire 5. The “ring shape” is, for example, a “ring shape”.

  Moreover, since it is sufficient to prepare a magnetic body MG that only forms a ring around the lead wire 5, the amount of magnetic material used can be reduced. As a result, the cost of the lead wire holding part 34 can be reduced.

  Furthermore, in the first embodiment, at least a part of the magnetic body MG is in contact with the lead wire 5. Therefore, the noise current flowing through the lead wire 5 due to the magnetic field of the magnetic body MG can be further effectively reduced, and EMI countermeasures can be further effectively taken. Specifically, the inner peripheral surface MGa of the magnetic body MG is in contact with the outer peripheral surface 50 of the lead wire 5.

  In addition, the amount of magnetic material used can be reduced as compared with the case where the magnetic body MG is disposed with a space in the direction D3 with respect to the lead wire 5. As a result, the cost of the lead wire holding part 34 can be further reduced. A direction D3 indicates a direction orthogonal to a direction D4 (FIG. 3) in which the lead wire 5 extends in the lead wire holding portion.

  Furthermore, according to the first embodiment, the lead wire holding portion 34 is fixed to the housing 38. Therefore, the noise current flowing through the lead wire 5 can be reduced by the magnetic field of the magnetic body MG at the fixed position of the lead wire holding portion 34 in the housing 38. That is, the noise current can be reduced relatively near the stator 30 and the substrate 36. Therefore, the noise current flowing through the coil 304 of the stator 30 and the electronic components of the substrate 36 can be effectively reduced, and EMI countermeasures can be effectively taken.

  Next, the lead wire holding portion 34 will be described more specifically with reference to FIGS. 2 and 3. FIG. 3 is a perspective view showing the lead wire holding portion 34. In FIG. 3, the lead wire 5 is indicated by a one-dot chain line for simplification of the drawing.

  As shown in FIGS. 2 and 3, in the first embodiment, the lead wire holding part 34 includes a plurality of magnetic bodies MG. The magnetic body MG is, for example, a ferrite magnet, a samarium cobalt magnet, a neodymium iron boron magnet, or a samarium iron nitrogen magnet. The magnetic body MG is preferably a plastic magnet that can be easily molded. The plastic magnet is, for example, ferrite, samarium cobalt, neodymium, or samarium iron nitrogen. The magnetic body MG may be a rubber magnet.

  Each of the plurality of magnetic bodies MG includes a first magnetic body piece MG1 and a second magnetic body piece MG2. Each of the first magnetic piece MG1 and the second magnetic piece MG2 has a substantially semi-cylindrical shape. The first magnetic piece MG1 and the second magnetic piece MG2 constitute a substantially cylindrical magnetic body MG. Each of the first magnetic piece MG1 and the second magnetic piece MG2 extends along the radial direction RD. That is, each of the plurality of magnetic bodies MG extends along the radial direction RD.

  The lead wire holding part 34 has a magnetic substance holding part 340. The magnetic body holding unit 340 holds a plurality of magnetic bodies MG. The magnetic body holding part 340 includes a substantially plate-like first holding part 341 and a substantially plate-like second holding part 342. Each of the 1st holding | maintenance part 341 and the 2nd holding | maintenance part 342 is comprised with the insulator. Each material of the 1st holding | maintenance part 341 and the 2nd holding | maintenance part 342 is a synthetic resin, for example. The synthetic resin is, for example, polybutylene terephthalate.

  The first holding part 341 has a plurality of first groove parts GV1. The second holding part 342 has a plurality of second groove parts GV2. The plurality of first groove portions GV1 are substantially parallel to each other and extend along the radial direction RD. The plurality of second groove portions GV2 are substantially parallel to each other and extend along the radial direction RD. The first groove portion GV1 is recessed in a substantially semicircular shape toward the upper side in the axial direction AD, and the second groove portion GV2 is recessed in a substantially semicircular shape toward the lower side in the axial direction AD.

  The first holding unit 341 holds a plurality of first magnetic piece MG1. Specifically, the plurality of first magnetic pieces MG1 are respectively disposed in the plurality of first groove portions GV1. The plurality of first magnetic pieces MG1 are substantially parallel to each other and extend along the radial direction RD. The second holding unit 342 holds a plurality of second magnetic piece MG2. Specifically, the plurality of second magnetic pieces MG2 are respectively disposed in the plurality of second groove portions GV2. The plurality of second magnetic pieces MG2 are substantially parallel to each other and extend along the radial direction RD.

  The first holding part 341 and the second holding part 342 are in contact with the axial direction AD. For example, the first holding unit 341 and the second holding unit 342 may be coupled in the axial direction AD. Each of the lead wires 5 is disposed between the first magnetic piece MG1 and the second magnetic piece MG2. As a result, each of the lead wires 5 is held by the first magnetic piece MG1 and the second magnetic piece MG2. That is, the first holding unit 341 holds the lead wire 5 via the first magnetic piece MG1, and the second holding portion 342 holds the lead wire 5 via the second magnetic piece MG2. In addition, the direction D4 in which the lead wire 5 extends in the lead wire holding portion 34 is substantially parallel to the radial direction RD.

(First modification)
A motor MT according to a first modification of the first embodiment will be described with reference to FIG. Embodiment in which the first modified example is described with reference to FIGS. 1 to 3 in that the lead wire holding portion 34 of the motor MT according to the first modified example includes the magnetic body MG with a part of the ring shape missing. Mainly different from 1. In the following, the difference between the first modification and the first embodiment will be mainly described. Further, for convenience of explanation, the lead wire holding portion 34 according to the first modification is referred to as “lead wire holding portion 34A”.

  FIG. 4 is a cross-sectional view showing a part of the lead wire holding portion 34A of the motor MT according to the first modification. As shown in FIG. 4, the lead wire holding portion 34A holds the lead wire 5 via the magnetic body MG. Each of the magnetic bodies MG constitutes at least a part of a ring shape around the lead wire 5. Therefore, according to the first modification, the noise current flowing through the lead wire 5 can be reduced by the magnetic field of the magnetic body MG, and EMI countermeasures can be effectively taken. The “ring shape” is, for example, a “ring shape”.

  Moreover, since it is sufficient to prepare the magnetic body MG that only forms at least a part of the ring shape around the lead wire 5, the amount of magnetic material used can be reduced. As a result, the cost of the lead wire holding portion 34A can be reduced.

  Still referring to FIG. 4, the lead wire holding portion 34A will be described more specifically. As shown in FIG. 4, the inner surface MGb of the magnetic body MG of the lead wire holding portion 34A is the outer peripheral surface of the lead wire 5 when viewed from the direction D4 (FIG. 3) in which the lead wire 5 extends. It is in contact with approximately half of the region. Note that the inner surface MGb of the magnetic body MG may be in contact with a region smaller than approximately half of the outer peripheral surface 50 of the lead wire 5 or in contact with a region greater than approximately half of the outer peripheral surface 50 of the lead wire 5. Also good.

  Specifically, the magnetic body MG has the second magnetic piece MG2, and the second holding portion 342 holds the second magnetic piece MG2. The first holding part 341 and the second holding part 342 are in contact with the axial direction AD. Therefore, the lead wire 5 is disposed between the first groove part GV1 of the first holding part 341 and the second magnetic body piece MG2 of the second holding part 342. As a result, the lead wire 5 is held by the first groove portion GV1 and the second magnetic piece MG2. That is, the first holding unit 341 holds the lead wire 5, and the second holding unit 342 holds the lead wire 5 via the second magnetic piece MG2. For example, the first holding unit 341 and the second holding unit 342 may be coupled in the axial direction AD.

(Second modification)
With reference to FIG. 5, a motor MT according to a second modification of the first embodiment will be described. The second modified example will be described with reference to FIGS. 1 to 3 in that the lead wire holding portion 34 of the motor MT according to the second modified example has a plurality of magnetic pieces MGP arranged at intervals. This is mainly different from the first embodiment. Hereinafter, the point in which the 2nd modification differs from Embodiment 1 is mainly explained. Further, for convenience of explanation, the lead wire holding portion 34 according to the second modification is referred to as “lead wire holding portion 34B”.

  FIG. 5 is a cross-sectional view showing a part of the lead wire holding portion 34B of the motor MT according to the second modification. As shown in FIG. 5, the lead wire holding part 34B holds the lead wire 5 via the magnetic body MG. Each of the plurality of magnetic bodies MG has a plurality of magnetic body pieces MGP. In the second modification, each of the plurality of magnetic bodies MG has two magnetic body pieces MGP. Each of the plurality of magnetic bodies MG may include three or more magnetic body pieces MGP. The plurality of magnetic pieces MGP are arranged in a ring shape around the lead wire 5 with an interval da in the outer peripheral direction D2 of the lead wire 5. Accordingly, the lead wire 5 is surrounded by the plurality of magnetic pieces MGP in the outer peripheral direction D2 of the lead wire 5. As a result, the noise current flowing through the lead wire 5 can be reduced by the magnetic fields of the plurality of magnetic pieces MGP, and EMI countermeasures can be effectively taken. The “ring shape” is, for example, a “ring shape”.

  In addition, since it is only necessary to prepare a necessary and sufficient number of magnetic pieces MGP for reducing the noise current flowing through the lead wire 5, the amount of magnetic material used can be reduced. As a result, the cost of the lead wire holding part 34B can be reduced.

  With continued reference to FIG. 5, the lead wire holding portion 34B will be described more specifically. As shown in FIG. 5, each of the magnetic piece MGP of the lead wire holding portion 34B has a substantially arc shape when the lead wire holding portion 34B is viewed from the direction D4 (FIG. 3) in which the lead wire 5 extends. Each of the magnetic piece MGP extends along the radial direction RD (FIG. 3). The inner surface MGb1 of one magnetic body piece MGP of the two magnetic body pieces MGP is in contact with a part of the outer peripheral surface 50 of the lead wire 5, and the inner surface MGb2 of the other magnetic body piece MGP is the lead wire 5 Is in contact with the other part of the outer peripheral surface 50.

  Specifically, the first holding unit 341 holds one magnetic piece MGP of the two magnetic pieces MGP, and the second holding unit 342 holds the other magnetic piece MGP. That is, one magnetic piece MGP of the two magnetic pieces MGP is disposed in the first groove portion GV1, and the other magnetic piece MGP is disposed in the second groove portion GV2. The first holding part 341 and the second holding part 342 are in contact with the axial direction AD. Therefore, the lead wire 5 is arranged between the magnetic piece MGP arranged in the first groove part GV1 and the magnetic piece MGP arranged in the second groove part GV2. As a result, the lead wire 5 is held by the two magnetic piece MGP. That is, the first holding unit 341 holds the lead wire 5 through the magnetic piece MGP, and the second holding unit 342 holds the lead wire 5 through the magnetic piece MGP. For example, the first holding unit 341 and the second holding unit 342 may be coupled in the axial direction AD.

  At least one magnetic piece MGP may be disposed across the outer peripheral direction D2 between the first holding part 341 and the second holding part 342.

(Third Modification)
A motor MT according to a third modification of the first embodiment will be described with reference to FIG. The third modification mainly differs from the first embodiment described with reference to FIGS. 1 to 3 in that the lead wire holding portion 34 of the motor MT according to the third modification is formed of a magnetic material. Hereinafter, the point in which the third modification differs from the first embodiment will be mainly described. Further, for convenience of explanation, the lead wire holding portion 34 according to the third modification is described as “lead wire holding portion 34C”.

  FIG. 6 is a cross-sectional view showing a part of the lead wire holding portion 34C of the motor MT according to the third modification. As shown in FIG. 6, the material of the lead wire holding portion 34C is a magnetic material. That is, the lead wire holding portion 34C is the magnetic body MG. Accordingly, it is possible to reduce the process of incorporating the magnetic material into the lead wire holding portion 34C. As a result, the production amount of the lead wire holding part 34C per certain time can be increased. Since the lead wire holding portion 34C is the magnetic body MG, the lead wire holding portion 34C holds the lead wire 5 via the magnetic body MG.

  Further, the noise current flowing through the lead wire 5 can be effectively reduced by the magnetic field of the lead wire holding portion 34C, and EMI countermeasures can be effectively taken. In particular, the lead wire holding portion 34 </ b> C surrounds the lead wire 5 in the outer peripheral direction D <b> 2 of the lead wire 5. In addition, at least a part of the lead wire holding portion 34 </ b> C is in contact with the lead wire 5. Therefore, the noise current flowing through the lead wire 5 can be further effectively reduced by the magnetic field of the lead wire holding portion 34C.

  Still referring to FIG. 6, the lead wire holding portion 34C will be described more specifically. As shown in FIG. 6, the lead wire holding portion 34C includes a substantially plate-like first holding portion 341A and a substantially plate-like second holding portion 342A. Each material of the first holding part 341A and the second holding part 342A is a magnetic material. That is, the first holding portion 341A is the first magnetic piece MG1, and the second holding portion 342A is the second magnetic piece MG2.

  The first holding portion 341A has a plurality of first groove portions GV1 similar to those in the first embodiment. The second holding portion 342A has a plurality of second groove portions GV2 similar to those in the first embodiment. The first holding part 341A and the second holding part 342A are in contact with the axial direction AD. For example, the first holding unit 341A and the second holding unit 342A may be coupled in the axial direction AD. Each of the lead wires 5 is disposed between the first groove part GV1 and the second groove part GV2. As a result, each of the lead wires 5 is held by the first groove part GV1 and the second groove part GV2. That is, the first holding unit 341A holds the lead wire 5, and the second holding unit 342A holds the lead wire 5. Further, the first groove portion GV1 and the second groove portion GV2 are in contact with the outer peripheral surface 50 of the lead wire 5.

(Fourth modification)
A motor MT according to a fourth modification of the first embodiment will be described with reference to FIG. The lead wire holding part 34 of the motor MT according to the fourth modified example has a magnetic body MG arranged with a space from the lead wire 5, and the fourth modified example refers to FIGS. This is mainly different from the first embodiment described above. Hereinafter, a point in which the fourth modification is different from the first embodiment will be mainly described. Further, for convenience of explanation, the lead wire holding portion 34 according to the fourth modified example is referred to as “lead wire holding portion 34D”.

  FIG. 7 is a cross-sectional view showing a part of the lead wire holding portion 34D of the motor MT according to the fourth modification. As shown in FIG. 7, the lead wire holding portion 34D holds the lead wire 5 via the magnetic body MG. The magnetic body MG is arranged at a distance db with respect to the lead wire 5 in a direction D3 orthogonal to the direction D4 (FIG. 3) in which the lead wire 5 extends in the lead wire holding portion 34D. Therefore, according to the fourth modified example, the degree of freedom of arrangement of the magnetic body MG in the lead wire holding portion 34D can be improved. That is, since it is not required to bring the magnetic body MG into contact with the lead wire 5, the magnetic body MG can be disposed at an arbitrary position in the lead wire holding portion 34D. Further, the noise current flowing through the lead wire 5 can be effectively reduced by the magnetic field of the magnetic body MG, and EMI countermeasures can be effectively taken.

  Specifically, the plurality of magnetic bodies MG are embedded in the lead wire holding portion 34D. More specifically, the plurality of first magnetic pieces MG1 of the magnetic body MG are embedded in the first holding portion 341 of the lead wire holding portion 34D. That is, the first holding unit 341 holds a plurality of first magnetic piece MG1. The second magnetic piece MG2 of the magnetic body MG is embedded in the second holding portion 342 of the lead wire holding portion 34D. That is, the second holding unit 342 holds a plurality of second magnetic piece MG2. Each of the first magnetic piece MG1 and the second magnetic piece MG2 has a substantially arc shape when the lead wire holding portion 34D is viewed from the direction D4 (FIG. 3) in which the lead wire 5 extends.

  Each of the lead wires 5 is disposed between the first groove part GV1 and the second groove part GV2, and is held by the first groove part GV1 and the second groove part GV2. That is, the first holding unit 341 holds the lead wire 5, and the second holding unit 342 holds the lead wire 5.

(Embodiment 2)
A motor MT according to Embodiment 2 of the present invention will be described with reference to FIGS. 8 and 9. The second embodiment is mainly different from the first embodiment in that a part of the lead wire holding portion 34 of the motor MT according to the second embodiment is configured as a part of the housing 38. Hereinafter, the points of the second embodiment different from the first embodiment will be mainly described. For convenience of explanation, the lead wire holding unit 34 according to the second embodiment is referred to as a “lead wire holding unit 34E”.

  FIG. 8 is a cross-sectional view illustrating a motor MT according to the second embodiment. FIG. 9 is a cross-sectional view illustrating a part of the lead wire holding portion 34E of the motor MT according to the second embodiment. In FIG. 9, the lead wire holding portion 34E is viewed from the direction D1 shown in FIG.

  As shown in FIG. 8, a part of the lead wire holding portion 34 </ b> E of the motor MT is configured as a part of the housing 38.

  Specifically, as shown in FIG. 9, the lead wire holding portion 34E holds the lead wire 5 via the magnetic body MG. The lead wire holding part 34E has a magnetic body holding part 340. The magnetic body holding unit 340 holds a plurality of magnetic bodies MG. A part of the magnetic body holding part 340 and the housing body 380 are a single member. Further, the other part of the magnetic body holding portion 340 and the cover 381 are a single member. Therefore, according to the second embodiment, a part of the magnetic body holding part 340 can be integrally formed with the housing main body 380, and the other part of the magnetic body holding part 340 can be integrally formed with the cover 381. Therefore, the process of manufacturing the magnetic body holding part 340 independently can be reduced, and the manufacturing cost of the magnetic body holding part 340 can be reduced. In addition, the number of parts of the motor MT can be reduced. Furthermore, the noise current flowing through the lead wire 5 can be effectively reduced by the magnetic field of the magnetic body MG, and EMI countermeasures can be effectively taken.

  Specifically, the magnetic body holding portion 340 is located at the boundary in the axial direction AD between the housing main body 380 and the cover 381. The magnetic body holding unit 340 includes a first holding unit 341 and a second holding unit 342.

  The first holding portion 341 and the cover 381 of the housing 38 are a single member and are integrally formed. Therefore, the first holding part 341 is configured as a part of the cover 381. The first groove GV1 is provided in the cover 381. Specifically, the first groove portion GV1 is recessed in a substantially semicircular shape from the lower end in the axial direction AD of the cover 381 toward the upper side in the axial direction AD. The first groove part GV1 extends along the radial direction RD (FIG. 8), as in the first embodiment.

  The second holding portion 342 and the housing main body 380 of the housing 38 are a single member and are integrally formed. Accordingly, the second holding portion 342 is configured as a part of the housing body 380. The second groove GV2 is provided in the housing body 380. Specifically, the second groove portion GV2 is recessed in a substantially semicircular shape from the upper end in the axial direction AD of the housing body 380 toward the lower side in the axial direction AD. The second groove portion GV2 extends along the radial direction RD (FIG. 8), as in the first embodiment.

  The plurality of first magnetic pieces MG1 are respectively disposed in the plurality of first groove portions GV1. The plurality of second magnetic pieces MG2 are respectively disposed in the plurality of second groove portions GV2. The cover 381 and the housing main body 380 are in contact with each other in the axial direction AD. For example, the cover 381 and the housing body 380 may be coupled in the axial direction AD. Therefore, each of the lead wires 5 is disposed between the first magnetic piece MG1 and the second magnetic piece MG2. As a result, each of the lead wires 5 is held by the first magnetic piece MG1 and the second magnetic piece MG2.

  The housing body 380 corresponds to an example of a “first housing”, and the cover 381 corresponds to an example of a “second housing”.

(Embodiment 3)
A motor MT according to Embodiment 3 of the present invention will be described with reference to FIG. The third embodiment is mainly different from the first embodiment in that the lead wire holding portion 34 of the motor MT according to the third embodiment is located outside the stationary portion 3. Hereinafter, the points of the third embodiment different from the first embodiment will be mainly described.

  FIG. 10 is a cross-sectional view illustrating a motor MT according to the third embodiment. As shown in FIG. 10, the stationary part 3 further includes a lead wire holding part 40 in addition to the configuration of the stationary part 3 according to the first embodiment described with reference to FIG. 1. The lead wire holding unit 40 holds at least one lead wire 5. In the third embodiment, the lead wire holding unit 40 holds a plurality of lead wires 5. The lead wire holding unit 40 is a so-called bushing. The lead wire holding portion 40 is fixed to the housing 38. Specifically, the lead wire holding part 40 is fixed to the housing body 380. The lead wire 5 is drawn out of the stationary part 3 from the substrate 36 via the lead wire holding part 40.

  That is, at least a part of the lead wire 5 extends from the housing 38 to the outside. The lead wire holding portion 34 (FIGS. 2 and 3) similar to that of the first embodiment is located outside the housing 38 and holds the end portion 51 located outside the housing 38 out of both ends of the lead wire 5. Therefore, according to the third embodiment, the noise current flowing through the lead wire 5 can be reduced by the magnetic field of the magnetic body MG (FIGS. 2 and 3) outside the housing 38, and EMI countermeasures can be effectively taken. it can. In particular, when the lead wire holding portion 34 is disposed outside the housing 38, the design restriction of the lead wire holding portion 34 may be smaller than when the lead wire holding portion 34 is fixed to the housing 38. In this case, the design of the lead wire holding part 34 including the magnetic body MG is easy.

  The embodiments (including modifications) of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above-described embodiment, and can be implemented in various modes without departing from the gist thereof. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. For example, constituent elements over different embodiments may be appropriately combined. In order to facilitate understanding, the drawings schematically show each component as a main component, and the thickness, length, number, interval, etc. of each component shown in the drawings are actual for convenience of drawing. May be different. In addition, the material, shape, dimensions, and the like of each component shown in the above embodiment are merely examples, and are not particularly limited, and various changes can be made without departing from the effects of the present invention. is there.

  The magnetic body MG described with reference to FIGS. 2 and 9 has the first magnetic body piece MG1 and the second magnetic body piece MG2, but may be a single magnetic member. In FIG. 3, the length of the first magnetic piece MG1 in the direction D4 is substantially equal to the length of the first groove part GV1 in the direction D4. However, the length of the first magnetic piece MG1 in the direction D4 may be shorter or longer than the length of the first groove part GV1 in the direction D4. Similarly, the length of the second magnetic piece MG2 in the direction D4 may be shorter or longer than the length of the second groove part GV2 in the direction D4. 8 may have the magnetic body MG shown in FIG. 4, FIG. 5, or FIG. 7 instead of the magnetic body MG shown in FIG.

  Further, the motor MT shown in FIG. 10 may include any one of the lead wire holding portions 34 </ b> A to 34 </ b> D (FIGS. 4 to 7) instead of the lead wire holding portion 34. . A motor MT shown in FIG. 10 replaces the lead wire holding portion 40 with any one of the lead wire holding portions 34, 34A to 34E (FIGS. 2, 4 to 7, and 9). You may have.

  Furthermore, as long as the lead wire holding portions 34 and 34A to 34E include the magnetic body MG, the shape of the lead wire holding portions 34 and 34A to 34E is not particularly limited. Further, the lead wire holding portions 34, 34 </ b> A to 34 </ b> E may hold one lead wire 5. That is, the lead wire holding portions 34, 34A, 34B, and 34D may include one magnetic body MG, one first groove portion GV1, and one second groove portion GV2. Further, the lead wire holding portion 34C may have one first groove portion GV1 and one second groove portion GV2. Furthermore, the present invention can also be applied to an outer rotor type motor. In the outer rotor type motor, the rotating part 1 is arranged on the outer side in the radial direction RD with respect to the stationary part 3.

  The present invention can be used for a motor, for example.

1 Rotating part 3 Static part 5 Lead wire (conductive member)
10 Magnet 30 Stator 34, 34A to 34E Lead wire holding portion (conductive member holding portion)
38 Housing 340 Magnetic body holding part 380 Housing body (first housing)
381 Cover (second housing)
MT motor MG magnetic body MGP magnetic piece AX central axis AD axial direction RD radial direction CD circumferential direction

Claims (10)

A rotating part that rotates around a central axis extending in the vertical direction and has a magnet;
A stationary part having a stator radially opposed to the magnet;
A conductive member connected directly or indirectly to the stator and drawn out of the stationary part;
The stationary part has a conductive member holding part for holding the conductive member,
The conductive member holding part includes a magnetic body at least in part.   The motor according to claim 1, wherein the magnetic body forms at least a part of an annular shape around the conductive member.   The motor according to claim 1, wherein the magnetic body is arranged in a ring shape around the conductive member. The magnetic body has a plurality of magnetic body pieces,
4. The motor according to claim 1, wherein the plurality of magnetic pieces are arranged around the conductive member in a ring shape with an interval in an outer peripheral direction of the conductive member. 5.   The motor according to any one of claims 1 to 4, wherein at least a part of the magnetic body is in contact with the conductive member.   The motor according to claim 1, wherein a material of the conductive member holding portion is a magnetic material.   5. The magnetic material according to claim 1, wherein the magnetic body is disposed at a distance from the conductive member in a direction orthogonal to a direction in which the conductive member extends in the conductive member holding portion. The motor described in. The stationary part further includes a housing,
The housing accommodates at least a part of the rotating part, covers at least a part of the stator,
The motor according to claim 1, wherein the conductive member holding portion is fixed to the housing. The stationary part further includes a housing,
The housing accommodates at least a part of the rotating part, covers at least a part of the stator,
The housing has a first housing and a second housing arranged along an axial direction,
The conductive member holding portion has a magnetic body holding portion for holding the magnetic body,
The magnetic body holding portion is located at an axial boundary between the first housing and the second housing,
A part of the magnetic body holding part and the first housing are a single member,
The motor according to any one of claims 1 to 5, wherein the other part of the magnetic body holding portion and the second housing are a single member. The stationary part further includes a housing,
The housing accommodates at least a part of the rotating part, covers at least a part of the stator,
At least a part of the conductive member extends to the outside from the housing,
The said conductive member holding | maintenance part is located in the exterior of the said housing, and hold | maintains the edge part located in the exterior of the said housing among the both ends of the said conductive member. Motor.

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