JP2020054149A - motor - Google Patents

Abstract

To provide a motor which easily suppresses magnetic effects to a rotation angle sensor.SOLUTION: A motor 1 has a housing 10, a stator 30 fixed to the housing 10, a rotor 40 rotatable with respect to the stator 30, a second magnet 42 changing detection components of a rotation angle sensor 91 according to a rotation of the rotor 40, a conductive member 60 provided on one side of an axial direction of a central axis J with respect to the stator 30, connected to a coil 31, and having a first extension portion 61 extending in the axial direction, and a bushing 70 a body portion 71 accommodating at least a part of the first extension portion 61 and composed of non-conducting material. The body portion 71 has a contact surface 73 contacting an inner peripheral surface of the housing 10 on the outside in a radial direction with respect to the central axis J, and the contact surface 73 is located at least in a central portion of the axial direction in the body portion 71.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a motor.

  2. Description of the Related Art A motor mounted on a driving device and controlled by the driving device to rotate the rotary shaft is well known. Such a motor includes a conductive member that connects between a driving device and a coil wound around a stator, and a suppression member that suppresses the conductive member from contacting another conductive portion such as a housing. . The suppression member is made of a non-conductive material.

  The motor described in Patent Literature 1 includes a sealing member corresponding to a suppressing member, and a lead wire corresponding to a conductive member. The seal member has a base portion that extends in the radial direction of the rotation shaft, and a protrusion that protrudes from the base portion toward the side opposite to the stator. The base portion has a plate shape. The lead passes through the inside of the protrusion. The driving device has a rotation angle sensor located on the axis of the rotation shaft. The rotation angle sensor is attached to a rotation shaft. The rotation angle sensor faces a member to be detected composed of a permanent magnet in the rotation axis direction.

JP-A-2015-144507

  As described in Patent Document 1, the base portion extends in a flange shape with respect to the protruding portion. Therefore, the protruding portion is separated from the housing by an amount corresponding to the base portion extending radially outward of the rotation shaft from the protruding portion. For this reason, the lead wire that passes through the inside of the protruding portion is closer to the rotation angle sensor by the distance that the protruding portion is away from the housing. Thus, the rotation angle sensor may be affected by a magnetic field caused by a current flowing through the lead wire.

  An object of the present invention is to provide a motor which can easily suppress a magnetic influence on a rotation angle sensor.

  A motor according to an exemplary first invention of the present application includes a cylindrical housing extending along a central axis, a stator fixed to an inner peripheral surface of the housing, and a stator with the central axis as a rotation axis. A motor comprising: a rotatable rotor; and a detected part that changes a detection component of a rotation angle sensor in accordance with the rotation of the rotor, provided on one side of the central axis with respect to the stator. A conductive member connected to a coil wound around the stator and having a first extension extending in the axial direction; and a main body extending in the axial direction and accommodating at least a part of the first extension. And a bush made of a non-conductive material.The main body has a contact surface on the radially outer side with respect to the central axis, the contact surface being in contact with an inner peripheral surface of the housing. Surfaces, at least, located in the center of the axial direction of the main body portion.

  According to the present invention, it is possible to provide a motor that can easily suppress the magnetic influence on the rotation angle sensor.

FIG. 1 is a cross-sectional view schematically illustrating a configuration of a motor according to an embodiment of the present invention. FIG. 2 is a plan view of the housing as viewed from above in the axial direction. FIG. 3 is a perspective view schematically showing the configuration of the bush. FIG. 4 is a bottom view of the bush. FIG. 5 is an enlarged sectional view of a region A surrounded by a two-dot chain line in FIG. FIG. 6 is a perspective view showing a supporting portion of the bush in the housing. FIG. 7 is a sectional view showing a process of attaching the bush to the housing.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the following embodiments. Further, modifications can be made as appropriate without departing from the range in which the effects of the present invention are exhibited.

  In this specification, a direction parallel to the center axis of the motor is referred to as “axial direction”, a radial direction about the central axis is referred to as “radial direction”, and a circumferential direction about the central axis is referred to as “ Direction. The upper side of the drawing is simply referred to as “upper side”, and the lower side is simply referred to as “lower side”, with the axial direction as the vertical direction. However, this vertical direction does not indicate the positional relationship or direction when the motor according to the present embodiment is actually incorporated into the device.

  FIG. 1 is a cross-sectional view schematically illustrating a configuration of a motor according to an embodiment of the present invention. FIG. 2 is a plan view of the housing as viewed from above in the axial direction.

  As shown in FIG. 1, the motor 1 according to the present embodiment includes a cylindrical housing 10 extending along a central axis J, a stator 30 fixed to an inner peripheral surface of the housing 10, and the central axis J as a rotation axis. A rotor 40 rotatable with respect to the stator 30. The housing 10 has a first housing portion 10a that houses the stator 30 and the like, and a second housing portion 10b that is positioned axially above the first housing portion 10a. The housing 10 has a bottom part 11 on the axially lower side of the first housing part 10a. A plurality of coils 31 are wound around the stator 30. The rotor 40 has a motor shaft 20 extending along the central axis J. Further, the rotor 40 has a plurality of first magnets 41 attached to the outer peripheral portion. Note that the housing 10 may not have the bottom 11 as long as it is cylindrical.

  Further, the rotor 40 has a second magnet 42 attached to an axially upper end of the motor shaft 20. The second magnet 42 rotates with respect to a rotation angle sensor 91 described later that uses magnetic information. Further, the second magnet 42 changes the detection component of the rotation angle sensor 91 according to the rotation of the rotor 40. In the present embodiment, the second magnet 42 corresponds to a detected portion that changes a detection component of the rotation angle sensor according to the rotation. In the present embodiment, the second magnet 42 is directly attached to the motor shaft 20, but may be attached via another member. That is, another member may be interposed between the second magnet 42 and the motor shaft 20.

  As shown in FIG. 1, the motor 1 includes a partition member that covers the stator 30. In the present embodiment, the partition member is the bearing holder 12. The bearing holder 12 is attached to the housing 10 in the axial direction above the stator 30 (one side). The bearing holder 12 has a bearing 21 that rotatably supports the motor shaft 20. As shown in FIG. 1, the bearing holder 12 has a through portion 12a penetrating in the axial direction. As shown in FIG. 2, each penetrating portion 12 a is a notch provided on a radially outer edge of the bearing holder 12. The bearing holder 12 is fixed to the housing 10 by four bolts 80. The shape and the number of the penetrating portions 12a are not limited as long as the main body 71 of the bush 70 described later can be accommodated.

  As shown in FIG. 1, the motor shaft 20 passes through the bottom 11 of the housing 10. The motor shaft 20 is rotatably supported by a bearing 22 in addition to the bearing 21. The bearing 22 is provided between the motor shaft 20 and the bottom 11 of the housing 10 in the radial direction.

  The motor 1 includes six conductive members 60 provided axially above the stator 30. The conductive member 60 is connected to the coil 31. As shown in FIG. 1, the conductive member 60 has a first extending portion 61 extending along the axial direction. The conductive member 60 has a second extending portion 62 that is continuous with an axially lower end of the first extending portion 61. The second extending portion 62 extends radially inward from an axially lower end of the first extending portion 61. The axially upper end of the first extension 61 passes through the through portion 12 a of the bearing holder 12 and is located axially above the bearing holder 12. In the present embodiment, the cross-sectional shape of the first extending portion 61 is rectangular. The shape of the conductive member 60 is not particularly limited.

  The motor 1 includes a bush 70 that accommodates each conductive member 60. In the present embodiment, two bushes 70 are provided. Each bush 70 accommodates three conductive members 60, respectively. Each bush 70 is made of a non-conductive material. Specifically, each bush 70 is formed of a rigid body made of resin. The resin used for the bush 70 is, for example, a PBT resin (polybutylene terephthalate resin). The bush 70 suppresses electric conduction between the conductive member 60 such as the housing 10 and the conductive member 60 and corrects the position of the conductive member 60.

  Hereinafter, a detailed configuration of the bush 70 will be described. Since the two bushes 70 have the same configuration, only the configuration of one bush 70 will be described, and the description of the other bush 70 will be omitted.

  FIG. 3 is a perspective view schematically illustrating the configuration of the bush 70. FIG. 4 is a bottom view of the bush 70. FIG. 5 is an enlarged sectional view of a region A surrounded by a two-dot chain line in FIG. FIG. 6 is a perspective view showing a support portion of the bush 70 in the housing 10.

  As shown in FIG. 3, the bush 70 has a main body 71 that houses the first extension 61. The main body 71 extends in the axial direction and the circumferential direction. Specifically, the main body 71 has a substantially rectangular parallelepiped shape. As shown in FIG. 3, the main body 71 has a first inclined surface 71 a which is inclined radially outward toward the upper side in the axial direction on the upper side in the axial direction and on the radially inner side. As shown in FIG. 2 and FIG. 3, the main body 71 has two second inclined surfaces 71 b that are inclined on the upper side in the axial direction and on both sides in the circumferential direction in directions approaching each other toward the upper side in the axial direction. As shown in FIGS. 1 and 5, a part of the main body 71 is accommodated in the through portion 12 a of the bearing holder 12.

  The main body 71 has a plurality of holes 72 penetrating in the axial direction. Each of the holes 72 accommodates the first extending portion 61. The hole 72 has a first opening 72a located on the lower side in the axial direction, and a second opening 72b located on the upper side in the axial direction. Each of the first opening 72a and the second opening 72b has a rectangular shape similar to the cross-sectional shape of the first extending portion 61. The opening area of the first opening 72a and the opening area of the second opening 72b are each larger than the cross-sectional area of the first extension 61. As shown in FIG. 5, in the axial direction, the hole 72 gradually expands from the central portion in the axial direction of the main body 71 toward the lower side in the axial direction. Therefore, as shown in FIG. 4, the opening area of the second opening 72b is larger than the opening area of the first opening 72a. The shape, number, and arrangement of the holes 72 are not particularly limited, and may be appropriately determined according to the shape of the conductive member 60 and the like.

  The main body 71 has a contact surface 73 that contacts the inner peripheral surface of the housing 10 on the radially outer side. The contact surface 73 is located at a central portion of the main body 71 in the axial direction. In the present embodiment, the contact surface 73 is constituted by the entire radially outer surface of the main body 71. The contact surface 73 does not need to be formed of the entire radially outer surface of the main body 71 as long as it is located at least in the axial center of the main body 71.

  As shown in FIG. 3, the main body 71 has two protrusions 74 protruding in the circumferential direction. Specifically, the two protrusions 74 are provided one by one on both ends in the longitudinal direction of the bush 70. The protrusion 74 is provided at an axially lower end of the main body 71. The protrusion 74 is located at a radially intermediate portion of the main body 71. The lower surface of the projection 74 in the axial direction is continuous with the lower surface of the main body 71 in the axial direction. Hereinafter, the lower end in the axial direction of the main body 71 is referred to as a lower end 76.

  The bush 70 has a protruding portion 75 protruding radially inward from the main body 71. As shown in FIG. 3, the protruding portion 75 is provided on the entire main body 71 in the longitudinal direction. As shown in FIGS. 3 and 5, the protrusion 75 is provided at a lower end 76 of the main body 71. The protrusion 75 extends continuously with the lower surface of the main body 71 in the axial direction. The protruding portion 75 is positioned axially below the through portion 12a. In the projecting direction of the projecting portion 75, the projecting portion 75 is larger than the penetrating portion 12a. For this reason, the penetrating part 12 a is in a state of housing the axially upper side of the protruding part 75 of the main body part 71. The shape and the number of the protruding portions 75 are not particularly limited.

  As shown in FIG. 6, the housing 10 has a support portion 14 for supporting the bush 70 in the second housing portion 10b. The support portion 14 has a groove 13 that is recessed in the circumferential direction. The groove 13 accommodates the protrusion 74. By housing the protrusion 74 in the groove 13, the lower end 76 of the main body 71 is supported by the housing 10. That is, the support section 14 supports the lower end section 76 of the main body section 71. The support portion 14 is located axially above the second extending portion 62 of the conductive member 60. As shown in FIG. 5, the support portion 14 supports the lower end portion 76 of the main body portion 71 at a position axially above the second extension portion 62.

  The shape and number of the protrusions 74 of the bush 70 are not particularly limited. The shape and number of the grooves 13 are not particularly limited as long as the protrusions 74 can be accommodated. In addition, from the viewpoint of stably supporting the main body 70 with respect to the housing 10, it is preferable that the projections 74 are provided at least on each of both end surfaces in the longitudinal direction of the bush 70.

  FIG. 7 is a cross-sectional view illustrating a process of attaching the bush 70 to the housing 10.

  As shown in FIG. 7, the bush 70 is attached to the housing 10 after the conductive member 60 is arranged in the housing 10 and before the bearing holder 12 is assembled to the housing 10. When attaching the bush 70 to the housing 10, the bush 70 is moved downward along the axial direction while passing the first extending portion 61 of the conductive member 60 through each hole 72. Then, each projection 74 is accommodated in each groove 13. Thus, the attachment of the bush 70 to the housing 10 is completed.

  After the bush 70 is attached to the housing 10, the bearing holder 12 is attached to the housing 10. When the bearing holder 12 is attached to the housing 10, the bearing holder 12 is moved downward along the axial direction while passing each body 71 through each through portion 12a. The bearing holder 12 moves until the bearing 21 is located around the motor shaft 20. Thereafter, the bearing holder 12 is fixed to the housing 10 by the bolt 80. Thus, the attachment of the bearing holder 12 to the housing 10 is completed.

  The motor 1 on which the mounting of the bearing holder 12 is completed is mounted on a mounting target. The mounting target of the motor 1 is, for example, a steering device of a vehicle. The steering device is an electric power steering device that assists a driver's steering operation by driving a motor 1.

  As shown in FIG. 1, the steering device has a connector section 90 for mounting the housing 10 of the motor 1. The connector section 90 has a cylindrical shape. In addition, the connector portion 90 has an outer shape slightly smaller than the inner shape of the upper end of the housing 10 in the axial direction, that is, the second housing portion 10b. The connector portion 90 can be attached to the second housing portion 10b while entering the cylinder of the second housing portion 10b. When the motor 1 is attached to the steering device, the connector section 90 is housed in the cylinder of the second housing section 10b.

  In addition, the steering device has a rotation angle sensor 91 that detects the rotation angle of the rotor 40. In the present embodiment, the rotation angle sensor 91 detects the rotation angle of the rotor 40 by detecting magnetic information. The rotation angle sensor 91 is located inside the connector section 90. Specifically, the rotation angle sensor 91 is located at a radially central portion of the connector section 90. The rotation angle sensor 91 is electrically connected to a control unit (not shown). The control unit generates a power supply signal based on the rotation angle of the rotor 40 detected by the rotation angle sensor 91 and a steering operation amount (not shown). The power supply signal is a signal for controlling power supply to the coil 31. The control unit may calculate the rotation angle of the rotor 40 based on the magnetic information detected by the rotation angle sensor 40.

  As shown in FIG. 1, when the housing 10 of the motor 1 is attached to the connector 90, a connector (not shown) provided on the connector 90 comes into contact with the conductive member 60. Thereby, the connector is electrically connected to the conductive member 60. That is, the control unit of the steering device and the coil 31 of the motor 1 are electrically connected via the connector and the conductive member 60. When the housing 10 is attached to the connector section 90, the rotation angle sensor 91 is located on the central axis J. To be more precise, the rotation angle sensor 91 faces the second magnet 42 in the axial direction. Thus, the rotation angle sensor 91 can detect a change in the magnetic field of the second magnet 42 due to the rotation of the motor shaft 20.

  The motor 1 according to the present embodiment has a main body 71 extending in the axial direction and accommodating at least a part of the first extending portion 71, and includes a bush made of a non-conductive material. The main body 71 has a contact surface 73 that is in contact with the inner peripheral surface of the housing 10 radially outward with respect to the central axis J. The contact surface 73 is located at least in the axial center of the main body 71. Since the main body 71 has the contact surface 73, the main body 71 can be positioned as radially outward as possible. Therefore, the conductive member 60 can be separated from the rotation angle sensor 91 as far as possible in the radial direction. As a result, even if a current flows through the conductive member 60 and a magnetic field is formed around the conductive member 60, the magnetic influence on the rotation angle sensor 91 is suppressed. Therefore, the rotation angle sensor 91 can accurately detect magnetic field information around the axially upper end of the motor shaft 20. That is, the rotation angle sensor 91 can accurately detect a change in the magnetic field due to the rotation of the motor shaft 20. As a result, the control unit of the steering device can generate the power supply signal based on the highly accurate rotation angle information of the rotor 40 and the steering operation amount. Thereby, since the rotation of the rotor 40 is controlled based on various kinds of information with high accuracy, the driver's steering operation becomes more comfortable.

  Further, in the motor 1 according to the present embodiment, the contact surface 73 is constituted by the entire surface on the radially outer side of the main body 71. Therefore, the conductive member 60 is easily separated from the rotation angle sensor 91. As a result, the magnetic influence on the rotation angle sensor 91 is more effectively suppressed.

  Further, in the motor 1 according to the present embodiment, the support portion 14 of the housing 10 supports the lower end portion 76 of the main body 71 at a position axially above the second extension 62. For this reason, the main body 71 does not contact the second extension 62. When the bush 70 is attached to the housing 10, no axial load is applied to the conductive member 60 because the main body 71 does not contact the second extension 62. As a result, when the bush 70 is attached to the housing 10, the conductive member 60 is prevented from coming into contact with the stator 30 or the like due to the movement of the conductive member 60 downward in the axial direction.

  In particular, in the motor 1 according to the present embodiment, the cross-sectional shape of each hole 72 is similar to the cross-sectional shape of the first extended portion 61 and has a larger opening area than the cross-sectional shape of the first extended portion 61. It has a shape. With the configuration of the hole 72, when the bush 70 is attached to the housing 10, the contact between the inner peripheral surface of the hole 72 and the first extending portion 61 is suppressed as much as possible. Therefore, when the bush 70 is attached to the housing 10, the movement of the conductive member 60 to the lower side in the axial direction is more effectively suppressed.

  In the motor 1 according to the present embodiment, the main body 71 has a protrusion 74 that protrudes in the circumferential direction. The housing 10 has a groove 13 that accommodates the protrusion 74. The protrusion 74 and the groove 13 facilitate positioning of the bush 70 when the bush 70 is attached to the housing 10. As a result, attachment of the bush 70 to the housing 10 becomes easy.

  In the motor 1 according to the present embodiment, the hole 72 gradually widens from the central portion in the axial direction toward the lower side in the axial direction. With the configuration of the hole 72, the accommodation of the first extension portion 61 in the hole 72 is performed smoothly. As a result, attachment of the bush 70 to the housing 10 becomes easy.

  In the motor 1 according to the present embodiment, the bush 70 has a protruding portion 75 protruding radially inward from the main body 71. In the projecting direction of the projecting portion 75, the projecting portion 75 is larger than the size of the penetrating portion 12a. And the penetration part 12a accommodates the axial direction upper side of the protrusion part 75 among the main-body parts 71. For this reason, as shown in FIG. 5, the protrusion 75 overlaps the radially outer edge of the bearing holder 12 in the axial direction. Specifically, the protrusion 75 is located axially below the outer edge of the bearing holder 12 in the radial direction. After the bush 70 and the bearing holder 12 are attached to the housing 10 by the projection 75 being located axially below the radially outer edge of the bearing holder 12, the projection 75 The movement of the shaft 70 in the axial direction is suppressed. As a result, the bush 70 does not easily come off from the conductive member 60. Therefore, it is possible to insulate between the bearing holder 12 and the conductive member 60.

  In the motor 1 according to the present embodiment, the main body 71 of the bush 70 has a first inclined surface 71a and two second inclined surfaces 71b. The first inclined surface 71a and the second inclined surface 71b can serve as guides for the bearing housing 12 when the bearing holder 12 is attached to the housing 10. As a result, attachment of the bearing housing 12 to the housing 10 becomes easier.

  In the motor 1 according to the present embodiment, the bush 70 is formed of a rigid body made of resin. If the bush 70 is a rigid body made of resin, the bush 70 is less likely to be deformed as compared to the case where the bush 70 is made of a flexible member such as rubber. As a result, the positioning accuracy of the conductive member 60 by the bush 70 is improved. Further, the distance between the conductive member 60 and the rotation angle sensor 91 in the radial direction is easily maintained. As a result, the magnetic influence on the rotation angle sensor 91 is more effectively suppressed.

  Further, in the present embodiment, the motor 1 is assembled by attaching the bearing holder 12 after the bush 70 is attached to the housing 10 to which the stator 30 is attached. That is, after positioning of the conductive member 60 with respect to the housing 10, the bearing holder 12 is attached to the housing 10. For this reason, when the bearing holder 12 is attached to the housing 10, contact between the bearing holder 12 and the conductive member 60 is suppressed. This suppresses the movement of the conductive member 60 when the bearing holder 12 is attached. Therefore, since the position of the conductive member 60 is maintained, when the motor 1 is attached to the connector portion 90 of the steering device, the connector provided on the connector portion 90 and the conductive member 60 are preferably in contact with each other.

  In the present embodiment, the resin constituting the bush 70 is a PBT resin which is a material having excellent self-lubricating properties. For this reason, when the bearing holder 12 is attached to the housing 10, the contact resistance between the bearing holder 12 and the bush 70 is small, so that the bearing holder 12 can be easily attached to the housing 10. Further, a load is hardly applied to the conductive member 60.

  As described above, the present invention has been described by the preferred embodiments. However, such description is not a limitation, and various modifications are possible.

  For example, in the embodiment, the main body 71 has a substantially rectangular parallelepiped shape. However, for example, it may have an elliptical column shape that extends in the axial direction and whose major axis extends in the circumferential direction. In particular, when the inner peripheral surface of the housing 10 has a curved surface, the contact surface 73 of the main body 71 is preferably a curved surface.

  In the above-described embodiment, the main body 71 has the protrusion 74, and the housing 10 has the groove 13. However, the housing 10 may have a protrusion, and the main body 71 may have a groove for accommodating the protrusion. Even with this configuration, the positioning of the bush 70 when attaching the bush 70 to the housing 10 is facilitated.

  In the above-described embodiment, the protruding portion 75 protrudes radially inward from the main body 71. However, for example, the protruding portion 75 may protrude from the main body 71 in the circumferential direction. In this case, the protrusion 71 may be provided separately from the protrusion 74, and the protrusion 74 may constitute the protrusion 75.

  In the above-described embodiment, the partition member is the bearing holder 12. However, the partition member may be provided separately from the bearing holder 12. When a partition member is provided separately from the bearing holder 12, the partition member only needs to cover the stator 30 and does not need to cover the rotor 40.

  In the embodiment, the bush 70 employs a PBT resin. However, another resin excellent in insulation may be used. Note that the resin used for the bush 70 is preferably a resin having excellent self-lubricating properties.

  Further, in the above-described embodiment, the rotation angle sensor 91 captures a magnetic field change due to the rotation of the second magnet 42, such as a Hall sensor using the Hall effect or an MR sensor using the magnetoresistive effect. The rotation angle may be detected.

  In the above-described embodiment, the rotation angle sensor 91 may be a sensor that detects the rotation angle of the motor shaft 20 using optical information such as an encoder. The rotation angle sensor using such optical information uses magnetic information for processing the optical information. For this reason, even if the rotation angle sensor 91 is a sensor using optical information, the same effect as in the above-described embodiment can be obtained. It should be noted that the rotation angle sensor using optical information may be any type that uses magnetic information for some processing, such as a direct type or a reflection type. In this case, the detected portion may be appropriately changed according to the detection method of the rotation angle sensor.

  Further, in the above-described embodiment, the rotation angle sensor 91 is provided in the connector section 90, but may be the configuration of the motor 1. When the rotation angle sensor 91 is configured as the motor 1, information detected by the rotation angle sensor 91 may be transmitted to an installation target of the motor 1 and used for some control on the installation target. The configuration for transmitting information between the rotation angle sensor and the object to be mounted may be a direct connection or a wireless connection.

  In the above-described embodiment, an electric power steering device that assists a driver's steering operation has been exemplified as a target to which the motor 1 is attached. However, other in-vehicle devices such as brakes and traction may be used. Further, the present invention is not limited to the in-vehicle device, and can be applied to various devices such as unmanned aerial vehicles such as drones and home appliances.

DESCRIPTION OF SYMBOLS 1 Motor 10 Housing 12 Bearing holder 12a Penetration part 13 Groove part 14 Support part 20 Motor shaft 30 Stator 31 Coil 40 Rotor 41 First magnet 42 Second magnet 60 Conductive member 61 First extension 62 Second extension 70 Bush 71 Body 72 hole 73 contact surface 74 protrusion 75 protrusion 76 lower end 90 connector 91 rotation angle sensor

Claims (7)

A cylindrical housing extending along the central axis;
A stator fixed to an inner peripheral surface of the housing;
A rotor rotatable with respect to the stator around the center axis as a rotation axis,
A detected part that changes a detection component of a rotation angle sensor in accordance with the rotation of the rotor,
A conductive member provided on one side of the central axis in the axial direction with respect to the stator, connected to a coil wound around the stator, and having a first extending portion extending along the axial direction;
A bush that extends in the axial direction and accommodates at least a part of the first extension portion, and that is made of a non-conductive material;
The main body has a contact surface that is in contact with an inner peripheral surface of the housing on a radially outer side with respect to the central axis,
The motor, wherein the contact surface is located at least at a central portion of the main body in the axial direction. The conductive member has a second extending portion extending in the radial direction while being continuous with an end of the first extending portion on the other side in the axial direction,
The housing has a support portion that supports the other end of the main body in the axial direction,
The motor according to claim 1, wherein the support portion supports the end of the main body at a position on the one side in the axial direction with respect to the second extension portion. One of the support portion and the main body portion has a protrusion that protrudes in a circumferential direction with respect to the central axis,
The other of the support portion and the main body portion has a groove recessed in the circumferential direction,
The motor according to claim 2, wherein the groove accommodates the protrusion. The main body has a hole penetrating in the axial direction,
4. The motor according to claim 1, wherein in the axial direction, the hole gradually expands from the central portion toward the other side in the axial direction. 5. The housing further includes a partition member attached to the one side in the axial direction of the stator than the stator, and covering the stator.
The partition member has a penetrating portion penetrating in the axial direction,
The bush has a protruding portion that protrudes from the main body in a circumferential direction with respect to the central axis or inward in the radial direction.
In the projecting direction of the projecting portion, the projecting portion is larger than the size of the penetrating portion,
The motor according to any one of claims 1 to 4, wherein the through portion accommodates the one side in the axial direction of the main body portion than the protruding portion.   The motor according to claim 5, wherein the through portion is a cutout provided at an outer edge of the partition member in the radial direction. The rotor has a motor shaft extending along the central axis,
The motor according to claim 5, wherein the partition member is a bearing holder that rotatably supports the motor shaft.

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