JP2019106788A - Rotor and motor - Google Patents

Abstract

To provide a rotor capable of suppressing an increase in stress operating a magnet as it is fixed while simply fixing the magnet and preventing scattering outside in a radial direction, and a motor.SOLUTION: A rotor 12 of a motor includes: a rotor core 31; a plurality of magnets 32; two end surface plates 33; a shaft 34; a shaft auxiliary member 37; and a magnet support member 38. In through holes 33b of the two end surface plates 33, a shaft 34 is inserted. The shaft auxiliary member 37 is composed of a non-magnetic material, and on an outer peripheral surface 34A of the shaft 34, is provided for a part corresponding to the rotor core 31 in an axial direction. The magnet support member 38 is composed of an elastic material and is provided on the outer peripheral surface 37A of the shaft auxiliary member 37. An end part outside in the radial direction of the magnet 32 is in contact with the rotor core 31. The end part 32a inside in the radial direction of the magnets 32 is elastically supported by the magnet support member 38.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotor and a motor.

Conventionally, there is known a motor provided with a plurality of permanent magnets arranged radially in the radial direction of the rotor (see, for example, Patent Document 1).
The rotor of this motor comprises an annulus consisting of a plurality of circumferentially alternating permanent magnets and a plurality of rotor cores. The radially outer position of each permanent magnet is regulated by the claws extending in the circumferential direction from the outer peripheral portion of the rotor core disposed on both sides in the circumferential direction.
The rotor also includes an end face plate sandwiching the annular body from both sides in the axial direction, and a stepped portion axially projecting from the inner peripheral edge of the end face plate. The outer peripheral surface of the stepped portion is in contact with the inner peripheral portion of the rotor core, and the radially inner position of each permanent magnet is positioned by the stepped portion.

International Publication No. 2014/129086

  By the way, in the motor according to one example of the prior art described above, when the permanent magnet is supported by the claws of the rotor core and the stepped portion of the end plate, the stress acting on the permanent magnet increases to cause damage or breakage of the permanent magnet. There is a fear.

  An object of the present invention is to provide a rotor and a motor capable of suppressing an increase in stress acting on a magnet with fixing while easily fixing the magnet and preventing scattering outward in the radial direction. Do.

  In order to solve the above-mentioned problems, the rotor according to the present invention is provided with a rotor core, a plurality of magnets disposed along the radial direction inside the rotor core, and both sides of the rotor core in the axial direction. A rotor comprising: two plate-like members in which through-holes are formed in a direction; and a shaft inserted through the through-holes in each of the two plate-like members, on the outer peripheral surface of the shaft A shaft auxiliary member made of nonmagnetic material provided at a position corresponding to the rotor core in the axial direction, and a magnet support member made of elastic material provided over the entire outer peripheral surface of the shaft auxiliary member The radially outer end is in contact with the rotor core, and the radially inner end of the magnet is elastically supported by the magnet support member.

  With this configuration, the plurality of magnets can be easily fixed. Since the plurality of magnets are elastically supported by the magnet support member, it is possible to suppress an increase in stress acting on each magnet. Since the plurality of magnets are disposed inside the rotor core, it is possible to reliably prevent the radially outward scattering of the respective magnets. Since the plurality of magnets do not directly contact the shaft, it is possible to prevent a short circuit of magnetic flux from occurring on the shaft side (that is, the inner peripheral side of the rotor core).

  In the rotor according to the present invention, on the outer peripheral surface of the shaft auxiliary member, a groove portion in which the magnet support member is disposed may be annularly formed over the entire outer peripheral surface.

  With this configuration, the arrangement of the magnet support member is facilitated, and the desired position of each magnet can be supported with high accuracy while preventing the positional deviation of the magnet support member.

  In the rotor according to the present invention, the elastic material may be a rubber material.

  By comprising in this way, a magnet support member can be formed simply.

  In the rotor according to the present invention, the magnet support member may be disposed at a position corresponding to the axial center of the rotor core on the outer circumferential surface of the shaft auxiliary member.

  With such a configuration, the axial center of each magnet can be supported, and it is possible to prevent the occurrence of a bias in the stress acting on the magnet and to prevent the occurrence of damage and breakage of the magnet.

  The rotor according to the present invention includes a second magnet support member made of an elastic material provided on a surface facing the rotor core in the axial direction in at least one of the two plate members, and the magnet At least one of the axial ends may be resiliently supported by the second magnet support member.

  By configuring in this manner, the plurality of magnets are supported in the axial direction by the second magnet support member in addition to the radial direction by the magnet support member. Therefore, the positioning accuracy of the plurality of magnets can be improved.

  In the rotor according to the present invention, each of the two plate-like members is provided with a protrusion projecting in the axial direction from the surface facing the end surface of the rotor core in the axial direction, and the protrusion is provided on the end surface of the rotor core A hole may be formed in which the protrusion is mounted.

  By configuring in this manner, the two plate members and the rotor core are fixed by the protrusion and the hole. For this reason, for example, even when each plate-like member is formed of a sintered material, the two plate-like members and the rotor core can be easily fixed.

  A motor according to the present invention may be a drive source of an electric power steering apparatus, including the rotor described above and a stator disposed radially outward of the rotor.

  With such a configuration, the reliability of the electric power steering apparatus can be improved.

  According to the present invention, a plurality of magnets can be fixed easily. Since the plurality of magnets are elastically supported by the magnet support member, it is possible to suppress an increase in stress acting on each magnet. Since the plurality of magnets are disposed inside the rotor core, it is possible to reliably prevent the radially outward scattering of the respective magnets. Since the plurality of magnets do not directly contact the shaft, it is possible to prevent a short circuit of magnetic flux from occurring on the shaft side (that is, the inner peripheral side of the rotor core).

It is an exploded perspective view showing composition of a rotor of a motor concerning an embodiment of the present invention. It is an exploded perspective view showing the composition of the motor concerning the embodiment of the present invention. It is a sectional view to the diameter direction of a motor concerning an embodiment of the present invention. It is a perspective view showing a plurality of magnets of a rotor of a motor concerning an embodiment of the present invention, and a magnet support member. FIG. 1 is a view showing an example of a schematic configuration of an electric power steering apparatus provided with a motor according to an embodiment of the present invention as a drive source. It is an exploded perspective view showing the composition of the end plate of the rotor of the motor concerning the modification of the embodiment of the present invention, and the 2nd magnet supporting member. It is a perspective view which omits and shows an end plate in a rotor of a motor concerning a modification of an embodiment of the present invention.

  Hereinafter, an embodiment of a rotor and a motor of the present invention will be described with reference to the attached drawings.

FIG. 1 is an exploded perspective view showing the configuration of the rotor 12 of the motor 1 according to the embodiment. FIG. 2 is an exploded perspective view showing the configuration of the motor 1 according to the embodiment. FIG. 3 is a cross-sectional view in the radial direction of the motor 1 according to the embodiment.
The motor 1 of the embodiment is mounted on, for example, an electric power steering apparatus (EPS; Electric Power Steering) for a vehicle or the like.

(motor)
The motor 1 is, for example, a drive source such as an electric power steering apparatus. The motor 1 is, for example, a three-phase brushless motor of U phase, V phase, and W phase. The motor 1 includes a housing 11, a rotor 12 and a stator 13. For example, the motor 1 is an inner rotor type in which the rotor 12 is disposed inside the stator 13.
In the following description, the axial direction of the rotor 12 is simply referred to as the axial direction, the rotational direction of the rotor 12 is referred to as the circumferential direction, and the radial direction of the rotor 12 orthogonal to the axial direction is referred to simply as the radial direction.

(housing)
The housing 11 includes a case 21 and a bracket 22.
The outer shape of the case 21 is formed, for example, in a bottomed cylindrical shape. The case 21 is provided with a first bearing holding portion 23 for holding a first bearing 35 described later on the inner surface 21A of the bottom portion 21a.

  The outer shape of the bracket 22 is formed, for example, in a disk shape. The bracket 22 is attached to the end 21b opposite to the bottom 21a in the axial direction of the case 21, and closes the opening 21c formed in the end 21b. The bracket 22 is provided with a second bearing holding portion 24 for holding a second bearing 36 described later on an end face 22A on the case 21 side in the axial direction. The bracket 22 is formed with a through hole 22 a penetrating in the axial direction. The shaft 34 of the rotor 12 described later is inserted into the through hole 22 a of the bracket 22 through the internal space of the case 21.

(Rotor)
The rotor 12 is rotatably disposed radially inward of the stator 13. The rotor 12 includes a rotor core 31, a plurality of magnets 32, two end face plates 33, a shaft 34, a first bearing 35 and a second bearing 36, a shaft auxiliary member 37, and a magnet support member 38. ing.
The outer shape of the rotor core 31 is formed, for example, in an annular cylindrical shape. The rotor core 31 is formed with a plurality of magnet attachment recesses 31a radially extending radially outward from positions at equal intervals in the circumferential direction on the inner circumferential surface 31B. On both axial end surfaces 31C, 31C of the rotor core 31, there are formed a plurality of holes 31b directed inward in the axial direction. For example, each hole 31b is formed in a substantially central portion in the radial direction on the end surface 31C (that is, a central portion between the inner peripheral surface and the outer peripheral surface of the rotor core 31).

  The outer shape of the magnet 32 is formed, for example, in a rectangular plate shape. Each of the plurality of magnets 32 is mounted to each of the plurality of magnet mounting recesses 31 a of the rotor core 31. For example, the axial length of each magnet 32 is formed to be the same as the axial length of each magnet mounting recess 31a, and the radial length of each magnet 32 is the depth in the radial direction of each magnet mounting recess 31a. Is set larger than the Thus, the radially inward end 32 a of each magnet 32 mounted in each magnet mounting recess 31 a protrudes radially inward from the inner peripheral surface 31 B of the rotor core 31.

  The magnetization direction of each magnet 32 is the radial direction of the rotor core 31. The two magnets 32, 32 adjacent in the circumferential direction are arranged such that mutually different magnetic poles face the inner circumferential surface of the stator 13.

  The outer shape of the end face plate 33 is formed, for example, in an annular plate shape. The diameter of the outer peripheral surface 33A of the end face plate 33 is set to be substantially the same as the diameter of the outer peripheral surface 31A of the rotor core 31. The two end face plates 33 are disposed so as to sandwich the rotor core 31 from both sides in the axial direction. Each end surface plate 33 is provided with a plurality of projecting portions 33 a projecting toward the plurality of hole portions 31 b of the rotor core 31 from the surface 33 C facing the end surface 31 C of the rotor core 31 in the axial direction. The end face plate 33 is fixed to the rotor core 31 by mounting the protrusions 33 a in the holes 31 b of the rotor core 31.

  A through hole 33 b penetrating in the thickness direction (that is, the axial direction) is formed in the central portion of the end face plate 33. For example, the diameter of the inner peripheral surface 33B which is a wall surface forming the through hole 33b of the end surface plate 33 is set to be slightly smaller than the diameter of the outer peripheral surface 34A of the shaft 34 described later. The end face plate 33 is externally fitted and fixed to a shaft 34 inserted through the through hole 33 b.

  The shaft 34 has a first end 34 a rotatably supported by the first bearing 35 held by the first bearing holding portion 23 of the bottom 21 a of the case 21, and the bracket 22 via the through hole 22 a of the bracket 22. And a second end 34 b projecting axially outward from the A portion on the second end 34 b side of the shaft 34 is rotatably supported by the second bearing 36 held by the second bearing holding portion 24 of the bracket 22. For example, the second end 34b of the shaft 34 includes a gear (not shown) engaged with a gear provided to an external device such as a steering of the electric power steering apparatus.

  The outer shape of the shaft auxiliary member 37 is formed, for example, in an annular cylindrical shape. The shaft auxiliary member 37 is formed of a nonmagnetic material. In the central portion of the shaft auxiliary member 37, a through hole 37a penetrating in the axial direction is formed. For example, the diameter of the inner peripheral surface 37B which is a wall surface forming the through hole 37a of the shaft auxiliary member 37 is set to be slightly smaller than the diameter of the outer peripheral surface 34A of the shaft 34. The shaft auxiliary member 37 is externally fitted and fixed to the shaft 34 inserted through the through hole 37a.

  The axial length of the shaft auxiliary member 37 is set, for example, smaller than the axial length of the rotor core 31. The shaft auxiliary member 37 is disposed at an axially central portion inside the rotor core 31. The diameter of the outer peripheral surface 37A of the shaft auxiliary member 37 is set smaller than the diameter of the inscribed circle inscribed in the radially inward end surfaces 32B of the plurality of magnets 32. That is, a predetermined distance is provided between the outer peripheral surface 37A of the shaft auxiliary member 37 and the radially inward end surface 32B of the plurality of magnets 32.

  An annular groove portion 37 b is formed at the central portion in the axial direction on the outer peripheral surface 37 </ b> A of the shaft auxiliary member 37 over the entire circumferential direction. A magnet support member 38, which will be described later, is attached to the groove 37b on the outer peripheral surface 37A of the shaft auxiliary member 37.

FIG. 4 is a perspective view showing a plurality of magnets 32 and a magnet support member 38 of the rotor 12 of the motor 1 according to the embodiment.
The outer shape of the magnet support member 38 is formed, for example, in an annular shape. The magnet support member 38 is formed of a nonmagnetic elastic material. For example, the nonmagnetic elastic material is a rubber material or the like. The magnet support member 38 is attached to the groove 37 b on the outer peripheral surface 37 A of the shaft auxiliary member 37.

  The thickness of the magnet support member 38 in the radial direction is set to be larger than the distance between the bottom surface 37C of the groove 37b on the outer peripheral surface 37A of the shaft auxiliary member 37 and the end surface 32B radially inward of each magnet 32 There is. That is, the magnet support member 38 mounted in the groove 37b on the outer peripheral surface 37A of the shaft auxiliary member 37 is sandwiched from both sides in the radial direction by the bottom surface of the groove 37b and the radially inward end surface 32B of each magnet 32. It is elastically deformed to be crushed. The elastically deforming magnet support member 38 elastically deforms the radially inward end 32a of each magnet 32 so that each magnet 32 is pushed into the magnet mounting recess 31a of the rotor core 31 by the outward radial restoring force. Support.

(Stator)
The stator 13 includes a stator core 41 and a coil 42.
The stator core 41 is internally fixed to the case 21 by, for example, shrink fitting. The stator core 41 includes a back yoke portion 43 and a plurality of teeth portions 44. The outer shape of the back yoke portion 43 is formed, for example, in a cylindrical shape. The outer shape of the teeth portion 44 is, for example, formed in a T-shaped plate shape.

  The plurality of teeth 44 protrude radially inward from equally spaced positions in the circumferential direction on the inner circumferential surface of the back yoke portion 43. The plurality of teeth 44 form a dovetail shaped slot 45 between each two teeth 44 adjacent in the circumferential direction. The teeth portion 44 includes an insulator 46 mounted so as to cover the surface. The insulator 46 is formed of, for example, a nonmagnetic material such as a resin.

  The coil 42 is attached to each of the plurality of teeth 44 from above the insulator 46 by, for example, concentrated winding. For example, the coils 42 disposed in the twelve slots 45 are wired in a two-system three-phase (U-phase, V-phase, and W-phase) structure.

(Electric power steering)
Hereinafter, an electric power steering apparatus 60 including the motor 1 of the above-described embodiment as a drive source will be described. FIG. 5 is a view showing an example of a schematic configuration of the electric power steering apparatus 60 according to the embodiment.
The electric power steering apparatus 60 includes a motor 1, a steering handle 61, a steering shaft 62, a gear box 63, a steering mechanism 64, a battery 65, a control device 66, a rotation angle sensor 67, and a torque sensor 68. And a vehicle speed sensor 69.

The steering wheel 61 is connected to the steering shaft 62.
The steering shaft 62 has a first end connected to the steering handle 61 and a second end connected to the gearbox 63. When a steering torque is generated between the steering wheel 61 operated by the driver and the gearbox 63, the steering shaft 62 rotates about the axis with the steering torque.

The gear box 63 is connected to the steering shaft 62, the steering mechanism 64, and the motor 1. The gear box 63 transmits the operation force and the steering torque of the driver's steering wheel 61 to the steering mechanism 64. The gear box 63 transmits the rotational driving force generated by the motor 1 to the steering shaft 62 to assist the steering force of the steering mechanism 64.
The steering mechanism 64 is connected to the gearbox 63 and the steered wheels of the vehicle. The steering mechanism 64 operates the direction of the steered wheels (not shown) of the vehicle according to the operation force of the steering wheel 61 of the driver transmitted via the gearbox 63 and the rotational driving force of the motor 1.

The battery 65 is connected to the control device 66.
The controller 66 includes electronic components for controlling the operation of the motor 1. For example, the electronic component configures a control unit, a power conversion unit, a drive unit, and the like.
For example, the control unit is a software function unit that functions by execution of a predetermined program by a processor such as a CPU (Central Processing Unit). The software function unit is an ECU (Electronic Control Unit) including an electronic circuit such as a processor such as a CPU, a ROM (Read Only Memory) for storing a program, a RAM (Random Access Memory) for temporarily storing data, and a timer. is there. Further, at least a part of the control unit may be an integrated circuit such as LSI (Large Scale Integration).

  For example, the power conversion unit includes a booster circuit or the like that boosts a DC voltage supplied from an external power supply (not shown). For example, the drive unit includes an inverter circuit that applies a drive voltage to the motor 1 and a current sensor that detects a current supplied to the motor 1.

  The rotation angle sensor 67 detects the rotation angle of the rotor 12 of the motor 1. For example, the rotation angle sensor 67 is a magnetic rotary encoder or the like provided with a resolver or a Hall IC. The rotation angle sensor 67 is connected to the controller 66. The rotation angle sensor 67 outputs a signal of the detected rotation angle to the control device 66.

The torque sensor 68 detects a steering torque generated on the steering shaft 62. For example, the torque sensor 68 is configured of a torsion bar type torsion force detection sensor. The torque sensor 68 is connected to the controller 66. The torque sensor 68 outputs a signal of the detected steering torque to the control device 66.
Vehicle speed sensor 69 detects the speed (vehicle speed) of the vehicle on which electric power steering apparatus 60 is mounted. The vehicle speed sensor 69 is connected to the control device 66. The vehicle speed sensor 69 outputs a signal of the detected vehicle speed to the control device 66.

  The motor 1 is connected to a gearbox 63. The control device 66 drives and controls the motor 1 based on the rotation angle of the motor 1 detected by the rotation angle sensor 67, the steering torque detected by the torque sensor 68, and the vehicle speed detected by the vehicle speed sensor 69. For example, the control device 66 sets a target torque value of the motor 1 based on the steering torque and the vehicle speed, and performs feedback control of the current supplied to the motor 1 so that the output torque of the motor 1 matches the target torque value. Run. The controller 66 controls the phase of the drive voltage according to the rotation angle of the motor 1 in the feedback control of the current.

  As described above, according to the motor 1 of the present embodiment, since the plurality of magnets 32 are elastically supported by the magnet support members 38, an increase in stress acting on each of the magnets 32 can be suppressed. Since the plurality of magnets 32 are disposed inside the rotor core 31, it is possible to reliably prevent the radially outward scattering of the respective magnets 32. Since the plurality of magnets 32 do not contact the shaft 34 directly, a short circuit of magnetic flux can be prevented from occurring on the shaft 34 side (that is, the inner peripheral side of the rotor core 31).

Furthermore, since the magnet support member 38 is disposed in the groove 37b on the outer peripheral surface 37A of the shaft auxiliary member 37, the arrangement of the magnet support member 38 is facilitated, and the displacement of the magnet support member 38 is prevented. The desired position can be accurately supported.
Furthermore, since the magnet support member 38 is made of a rubber material, the magnet support member 38 can be easily formed.

  Furthermore, since the magnet support member 38 is disposed at the position corresponding to the axial center of the rotor core 31 on the outer peripheral surface 37A of the shaft auxiliary member 37, the axial center of each magnet 32 can be supported. Thus, it is possible to prevent the stress acting on the magnet 32 from being biased, and to prevent the occurrence of damage and breakage of the magnet 32.

  Furthermore, since the end face plate 33 is fixed to the rotor core 31 by mounting the protrusions 33 a in the holes 31 b of the rotor core 31, for example, when the end face plates 33 are formed of a sintered material Even if it exists, each end surface plate 33 and the rotor core 31 can be fixed easily.

Hereinafter, modifications of the embodiment will be described.
FIG. 6 is an exploded perspective view showing the configuration of the end face plate 33 and the second magnet support member 71 of the rotor 12 of the motor 1 according to the modification of the embodiment. FIG. 7 is a perspective view showing the end plate 33 of the rotor 12 of the motor 1 according to the modification of the embodiment with the end face plate omitted.
In this modification, on the surface 33C of each of the two end face plates 33, an annular second groove 33c is formed along the circumferential direction at a position facing each of the plurality of magnets 32. A second magnet support member 71 is attached to the second groove 33 c on the surface 33 C of each end face plate 33.

  The outer shape of the second magnet support member 71 is formed, for example, in an annular shape. The second magnet support member 71 is formed of a nonmagnetic elastic material. For example, the nonmagnetic elastic material is a rubber material or the like. The second magnet support members 71 are attached to the second grooves 33 c on the surface 33 C of each end surface plate 33.

  The axial thickness of the second magnet support member 71 is set larger than the distance between the bottom surface 33D of the second groove 33c and the axial end surface 32C of each magnet 32. That is, the second magnet support member 71 mounted in the second groove 33c on the surface 33C of each end face plate 33 is in the axial direction by the bottom surface of the second groove 33c and the end face 32C of each magnet 32 in the axial direction. It is elastically deformed so as to be pinched and crushed from both sides of. The elastically deformed second magnet support member 71 elastically supports the axial end face 32C of the magnet 32 by a restoring force directed to the magnet 32 in the axial direction.

  According to this modification, since the plurality of magnets 32 are supported in the axial direction by the second magnet support member 71 in addition to the radial direction by the magnet support members 38, the positioning accuracy of the plurality of magnets 32 is improved. Can.

In the embodiment described above, one groove 37b and one magnet support member 38 on the outer peripheral surface 37A of the shaft auxiliary member 37 are provided, but the invention is not limited thereto.
For example, two or more grooves 37b and two or more magnet support members 38 may be provided.

  In the embodiment described above, the end face plate 33 may be formed of either a nonmagnetic material or a magnetic material, and preferably the magnetic flux generated from the axial end of the magnet 32 does not short circuit in the end face plate 33 Preferably, it is formed of a nonmagnetic material. On the other hand, when it is formed of a magnetic material, the magnetic material (for example, iron) is generally cheaper than the nonmagnetic material (for example, stainless steel), and the cost can be reduced.

In the embodiment described above, any one of the two end face plates 33 may be integrally formed with the shaft 34 by a magnetic material.
In the embodiment described above, any one of the two end face plates 33 may be integrally formed of the same material as the shaft auxiliary member 37.

  In the embodiment described above, although the motor 1 is mounted on the electric power steering device 60, the present invention is not limited to this, and the motor 1 may be mounted on another device.

  Embodiments of the present invention are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in other various forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and the equivalents thereof as well as included in the scope and the gist of the invention.

DESCRIPTION OF SYMBOLS 1 ... Motor 12 ... Rotor 13 ... Stator 31 ... Rotor core 31b ... Hole part 31C ... End surface 32 ... Magnet (magnet)
33: End plate (plate-like member)
33a: Projection 33b: Through hole 33C: Surface 34: Shaft 34A: Outer peripheral surface 37: Shaft auxiliary member 37b: Groove 37A: Outer peripheral surface 38: Magnet support member 60: Electric power steering device 71: Second magnet support member

Claims (7)

A rotor core,
A plurality of magnets disposed radially along the inside of the rotor core;
Two plate-like members disposed on both sides in the axial direction of the rotor core and in which through holes are formed in the axial direction;
A shaft inserted through the through hole of each of the two plate members;
A rotor comprising
A shaft auxiliary member made of a nonmagnetic material provided on the outer peripheral surface of the shaft at a position corresponding to the rotor core in the axial direction;
A magnet support member made of an elastic material provided over the entire outer peripheral surface of the shaft auxiliary member;
Equipped with
The radially outward end of the magnet contacts the rotor core,
A radially inner end of the magnet is elastically supported by the magnet support member. The rotor according to claim 1, wherein a groove portion in which the magnet support member is disposed is annularly formed on the entire outer peripheral surface on the outer peripheral surface of the shaft auxiliary member. The elastic material is a rubber material,
The rotor according to claim 1 or 2, characterized in that: The magnet support member is disposed at a position corresponding to the axial center of the rotor core on the outer peripheral surface of the shaft auxiliary member. The rotor as described in a paragraph. A second magnet support member made of an elastic material provided on the surface facing the rotor core in the axial direction in at least one of the two plate members;
The at least any one of the both ends of the said axial direction of the said magnet is elastically supported by the said 2nd magnet support member, The any one of the Claims 1-4 characterized by the above-mentioned. The rotor of Each of the two plate-like members has a protrusion that protrudes in the axial direction from a surface facing the end face of the rotor core in the axial direction;
The rotor according to any one of claims 1 to 5, wherein a hole to which the projection is attached is formed on the end face of the rotor core. A rotor according to any one of claims 1 to 6;
A stator disposed radially outward of the rotor;
Equipped with
A motor characterized in that it is a drive source of an electric power steering apparatus.

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