JP2017147867A - Rotor and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor and motor that are able to facilitate fitting of a magnet to a rotor core, inhibit a manufacturing cost, and securely fix the magnet to the rotor core, and also to provide a rotor and motor that are able to prevent an increase in motor size.SOLUTION: A rotor comprises: a rotary shaft 31; a rotor core 32 fixed to the rotary shaft 31; a magnet 33 fitted to an outer peripheral surface of the rotor core 32; and magnet pressers 34A, 34B provided at both axial ends of the rotor core 32. Each of the magnet pressers 34A, 34B comprises: a fixing part 36 fixed to an axial end part of the rotor core 32; a pressing pawl 38 for pressing the axial end part of the magnet 33; and an elastic arm part 37 provided so as to extend from the fixing part 36 to the pressing pawl 38 and connecting the fixing part 36 and the pressing pawl 38.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a rotor and a motor.

Permanent magnet type synchronous motors are roughly classified into the following two types. That is, there are two types, an SPM (Surface Permanent Magnet) type in which a magnet is assembled to the outer peripheral surface (front surface) of a rotor core (iron core) of the rotor, and an IPM (Interior Permanent Magnet) type in which a magnet is assembled inside the rotor core of the rotor.
The SPM type motor has the advantages that the effective magnetic flux amount is large and the torque ripple is small because the magnet is exposed on the outer peripheral surface of the rotor core. For this reason, SPM type motors are used in various fields.

Here, in the SPM type motor, various methods for fixing the magnet to the rotor core have been proposed. For example, a technique for fixing a rotor core and a magnet using an adhesive is disclosed (for example, see Patent Document 1).
Further, a technique is also disclosed in which a magnet cover (cover member) that covers the entire outer surface of the magnet is provided on the rotor core, and the magnet is held on the outer peripheral surface of the rotor core by the magnet cover (see, for example, Patent Document 2).

JP 2004-222455 A JP 2010-259304 A

  However, in the above-mentioned Patent Document 1, a facility for curing the adhesive is necessary, and manufacturing costs are increased. Further, the temperature control for curing the adhesive is troublesome, and it takes time until the adhesive is cured, so that the production efficiency is poor. Furthermore, the magnet may be damaged due to the difference in thermal expansion coefficient between the adhesive and the rotor core or permanent magnet. Further, the adhesive leaks when the magnet is fixed to the rotor core, and the fixing strength of the magnet to the rotor core may be reduced.

  In Patent Document 2 described above, the air gap between the stator and the rotor is increased by the thickness of the magnet cover, and the effective magnetic flux is reduced. For this reason, compared with the case where a magnet cover is not used, the motor size for obtaining predetermined motor performance will become large.

Therefore, the present invention has been made in view of the above-described circumstances, and provides a rotor and a motor that can facilitate assembly of a magnet to a rotor core, reduce manufacturing costs, and can securely fix the magnet to the rotor core. Is.
Further, the present invention provides a rotor and a motor that can prevent an increase in motor size.

  In order to solve the above problems, a rotor according to the present invention includes a rotating shaft, a columnar rotor core fixed to the rotating shaft, a ring-shaped magnet fitted to the outer peripheral surface of the rotor core, A magnet presser provided at both axial ends of the rotor core to prevent the magnet from coming off from the rotor core in the axial direction, and the magnet presser is fixed to the axial end of the rotor core; A pressing portion that presses the axial end of the magnet, and an elastic connecting portion that is provided so as to straddle the fixing portion and the pressing portion, and that connects the fixing portion and the pressing portion and has elasticity. It is characterized by having.

With such a configuration, the magnet can be fixed to the rotating shaft without using an adhesive or the like, so that the assembly of the magnet to the rotor core can be facilitated and the manufacturing cost can be reduced. In addition, since both ends of the magnet in the axial direction are pressed by the elastic connecting portion, the magnet can be securely fixed to the rotor core.
Furthermore, since the entire outer surface of the magnet is exposed while using the magnet presser, the effective magnetic flux of the magnet does not decrease. For this reason, the enlargement of the motor size can be prevented.

  In the rotor according to the present invention, the elastic coupling portion includes a plurality of arms extending radially outward from the fixed portion, and the pressing portion is provided at a tip of the arm.

  With this configuration, the rotor core and the entire axial end of the magnet are not covered, the rotor can be reduced in weight, and the material cost of the magnet presser can be reduced. Moreover, it becomes easy to give elasticity to an elastic connection part by using an elastic connection part as an arm.

  In the rotor according to the present invention, the number of the arms is set to be the same as the number of magnetic poles of the magnet, and each of the arms is arranged to correspond to each magnetic pole of the magnet. And

  By comprising in this way, the magnetic flux leakage of a magnet can be suppressed via a magnet presser. For this reason, it can prevent that motor performance falls.

  In the rotor according to the present invention, a claw portion bent toward the magnet in the axial direction is formed at the tip of the presser portion, and a recess for receiving the claw portion is formed at the axial end of the magnet. It is characterized by being.

  By configuring in this way, it is possible to prevent the magnet from being displaced in the circumferential direction with respect to the rotor core. For this reason, the fixing force of the magnet to the rotor core can be reliably increased.

  In the rotor according to the present invention, the claw portion has a tapered shape so that the claw width in the circumferential direction becomes narrower toward the tip, and the concave portion has two inner surfaces facing each other in the circumferential direction. Inclined so as to correspond to the shape of the part.

  With this configuration, the force of pressing the magnet of the claw portion in the axial direction or the pressing direction of the magnet of the claw portion also acts in the circumferential direction of the magnet. For this reason, it becomes possible to determine the relative position between the magnet presser and the magnet with high accuracy and to prevent the magnet from rattling against the magnet presser.

  In the rotor according to the present invention, the extension length of the claw portion is set longer than the depth of the concave portion in a state where the axial end portion of the rotor core and the axial end portion of the magnet are arranged on the same plane. It is characterized by being.

  By comprising in this way, when a nail | claw part is inserted in a recessed part, an elastic connection part bends slightly. For this reason, the elastic force of an elastic connection part can be reliably transmitted to a nail | claw part. Since the force which presses a recessed part increases in a nail | claw part, the fixing force of the magnet to a rotor core can be improved more reliably.

  In the rotor according to the present invention, the rotor core has a rotor side through hole penetrating in the axial direction, and the fixed portion has a fixed portion side through hole communicating with the rotor side through hole. A fixing tool that is inserted into the hole and the fixing part side through hole and fixes the rotor core and the fixing part is provided.

  By comprising in this way, a magnet presser can be reliably fixed to a rotor core. As a result, the fixing force of the magnet to the rotor core can be reliably increased.

  The rotor according to the present invention is provided with a rotating shaft, a columnar rotor core fixed to the rotating shaft, a ring-shaped magnet fitted to the outer peripheral surface of the rotor core, and axial ends of the rotor core, A magnet presser that prevents the magnet from coming off from the rotor core in the axial direction, and the magnet presser includes a fixing part that is fixed to an axial end part of the rotor core, and an axial end part of the magnet. It is provided with a pressing part, and a connecting part that is provided so as to straddle the fixing part and the pressing part and connects the fixing part and the pressing part.

  With such a configuration, the magnet can be fixed to the rotating shaft without using an adhesive or the like, so that the assembly of the magnet to the rotor core can be facilitated and the manufacturing cost can be reduced. In addition, since the magnet is fixed to the rotor core by pressing both ends of the magnet in the axial direction with a magnet presser, the effective magnetic flux of the magnet can be prevented from decreasing while the magnet is securely fixed. For this reason, the enlargement of the motor size can be prevented.

  In the rotor according to the present invention, the magnet presser further includes an auxiliary presser formed in a wedge shape so as to be inserted into a gap between the outer peripheral surface of the rotor core and the inner peripheral surface of the magnet. And

  By comprising in this way, a magnet can be reliably fixed to a rotor core, preventing the backlash of the magnet with respect to a rotor core.

  In the rotor according to the present invention, the rotor core has a rotor side through hole penetrating in the axial direction, and one of the two magnet pressers has a fixing portion of the magnet press through the rotor side through hole. A fixing column that protrudes toward the other magnet presser side is provided, and the fixing column of the one magnet presser is inserted into the fixing portion of the other magnet presser of the two magnet pressers. A possible insertion hole is formed, and a heat caulking portion for connecting the two magnet pressers is formed at the tip of the fixed column.

  By comprising in this way, a magnet presser can be reliably fixed to a rotor core. As a result, the fixing force of the magnet to the rotor core can be reliably increased.

  A motor according to the present invention includes the above-described rotor, and a stator that rotates the rotor by generating a magnetic attractive force or a repulsive force to the rotor when energized. And

  With this configuration, it is possible to provide a motor that can facilitate the assembly of the magnet to the rotor core, can reduce the manufacturing cost, and can securely fix the magnet to the rotor core. In addition, it is possible to provide a motor that can prevent an increase in motor size.

According to the present invention, since the magnet can be fixed to the rotating shaft without using an adhesive or the like, the assembly of the magnet to the rotor core can be facilitated, and the manufacturing cost can be reduced. In addition, since both ends of the magnet in the axial direction are pressed by the elastic connecting portion, the magnet can be securely fixed to the rotor core.
Furthermore, since the entire outer surface of the magnet is exposed while using the magnet presser of the magnet, the effective magnetic flux of the magnet does not decrease. For this reason, the enlargement of the motor size can be prevented.

It is a perspective view of the motor with a reduction gear in the embodiment of the present invention. It is sectional drawing which follows the AA line of FIG. It is a perspective view of the stator in the embodiment of the present invention. It is the B section enlarged view of FIG. It is a perspective view of the rotor in 1st Embodiment of this invention. It is a perspective view of the rotor in 1st Embodiment of this invention. It is C arrow line view of FIG. It is sectional drawing which follows the DD line | wire of FIG. It is a perspective view of the magnet presser in a 1st embodiment of the present invention. It is sectional drawing which follows the EE line | wire of FIG. It is an expanded sectional view of the crevice formed in the magnet in the modification of a 1st embodiment of the present invention. It is the top view which looked at the rotor in the modification of 1st Embodiment of this invention from the axial direction one side. It is a perspective view of the rotor in 2nd Embodiment of this invention. It is sectional drawing which follows the FF line | wire of FIG. It is a perspective view of the magnet presser in 2nd Embodiment of this invention. It is a perspective view of the magnet presser in 2nd Embodiment of this invention. It is a perspective view of the rotor in 3rd Embodiment of this invention. It is sectional drawing which follows the GG line of FIG. It is a perspective view of the magnet presser in 3rd Embodiment of this invention. It is the H section enlarged view of FIG. It is a perspective view which shows the attachment state of the magnet presser in 3rd Embodiment of this invention.

  Next, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
(Motor with reduction gear)
1 is a perspective view of a motor 1 with a speed reducer, and FIG. 2 is a cross-sectional view taken along line AA of FIG.
As shown in FIGS. 1 and 2, the motor 1 with a speed reducer serves as a drive source for electrical components (for example, a power window, a sunroof, an electric seat, etc.) mounted on a vehicle, for example. The motor 1 with a speed reducer includes a motor unit 2, a speed reduction unit 3 that decelerates and outputs the rotation of the motor unit 2, and a controller unit 4 that performs drive control of the motor unit 2. In the following description, the simple axial direction refers to the axial direction of the rotating shaft 31 of the motor unit 2, the simple circumferential direction refers to the circumferential direction of the rotating shaft 31, and simply refers to the radial direction. The radial direction of the rotating shaft 31 shall be said.

(Motor part)
The motor unit 2 includes a motor case 5, a substantially cylindrical stator 8 housed in the motor case 5, and a rotor 9 provided radially inside the stator 8 and rotatable with respect to the stator 8. It is equipped with.

(Motor case)
The motor case 5 is formed of a material having excellent heat dissipation, such as aluminum die casting. The motor case 5 includes a first motor case 6 and a second motor case 7 that are configured to be separable in the axial direction. The first motor case 6 and the second motor case 7 are each formed in a bottomed cylindrical shape, and the motor case 5 having an internal space is formed by fitting the respective openings 6a and 7a.

More specifically, the first motor case 6 is integrally formed with the gear case 40 so that the bottom portion 10 is joined to the gear case 40 of the speed reduction portion 3. A through-hole 10 a through which the rotation shaft 31 of the rotor 9 can be inserted is formed at a substantially central portion in the radial direction of the bottom 10.
Further, on the inner peripheral surface of the first motor case 6, a stator internal fitting portion 18 having a diameter increased by a step is formed between the opening 6 a and the substantially axial center. The outer peripheral surface of the stator 8 is fitted to the stator inner fitting portion 18. Further, a protruding strip portion 12 is provided on the outer peripheral surface of the peripheral wall portion 11 of the first motor case 6 so as to project over the entire periphery on the opening 6a side. An opening 7 a of the second motor case 7 is fitted to the ridge 12.

An inner diameter D2 of the peripheral wall portion 14 of the second motor case 7 is set to be larger than an inner diameter D1 of the stator inner fitting portion 18 formed in the first motor case 6.
In addition, the second motor case 7 is formed with a fitting portion 15 that is fitted to the convex portion 12 of the first motor case 6 at the periphery of the opening 7a. The fitting portion 15 is formed by integrating a first diameter-expanded portion 16 having a diameter increased from the peripheral wall portion 14 by a step and a second diameter-expanded portion 17 having a diameter increased from the first diameter-expanded portion 16 by a step. It is molded. Then, the ridge 12 of the first motor case 6 is fitted into the second enlarged diameter portion 17.

  The relative position in the axial direction between the first motor case 6 and the second motor case 7 is determined by the end surface 12a of the ridge 12 contacting the stepped surface 17a of the second enlarged diameter portion 17. On the other hand, the first enlarged diameter portion 16 is formed so as to avoid contact with the tip side (opening edge side) of the first motor case 6 with respect to the ridge portion 12.

(Stator)
FIG. 3 is a perspective view of the stator 8.
As shown in FIGS. 2 and 3, the stator 8 fitted in the stator inner fitting portion 18 is formed in a substantially cylindrical shape and has a core portion 21 that forms a magnetic path, and radially inward from the stator core 20. A plurality of teeth 22 projecting toward each other has a stator core 20 integrally formed. The stator core 20 is formed by laminating a plurality of metal plates in the axial direction. The stator core 20 is not limited to the case where a plurality of metal plates are laminated in the axial direction, and may be formed, for example, by press-molding soft magnetic powder. The outer peripheral surface of the core portion 21 of the stator core 20 formed as described above is fitted into the stator inner fitting portion 18 of the first motor case 6.

Here, since the inner diameter D2 of the peripheral wall portion 14 in the second motor case 7 is set larger than the inner diameter D1 of the stator inner fitting portion 18 formed in the first motor case 6, the inner periphery of the peripheral wall portion 14 is set. A gap S <b> 1 is formed between the surface and the outer peripheral surface of the core portion 21.
A resin insulator 23 is attached to the teeth 22 of the stator core 20 so as to cover the periphery of the teeth 22.

FIG. 4 is an enlarged view of a portion B in FIG.
As shown in detail in FIGS. 3 and 4, the insulator 23 is erected on the bottom 23 a that covers the periphery of the tooth 22, and on the radially outer side of the bottom 23 a (the base end side (the radially outer side of the tooth 22)). The outer peripheral wall 23b and the inner peripheral wall 23c erected on the radially inner side of the bottom 23a (the tip side of the teeth 22 (the radially inner side)) are integrally formed. The height H1 of the inner peripheral wall 23c is set higher than the height H2 of the outer peripheral wall 23b.
A coil 24 is wound around each of the teeth 22 from above the insulator 23 configured as described above. Each coil 24 generates a magnetic field for rotating the rotor 9 by power feeding from the controller unit 4.

  Here, a motor-side heat radiation sheet 25 is provided between the bottom 13 of the second motor case 7 and the coil 24 wound around the stator 8. The motor-side heat radiation sheet 25 is formed of a material that is softer than the motor case 5 and the coil 24. Thereby, the motor-side heat radiation sheet 25 is in close contact with each of the bottom portion 13 of the second motor case 7 and the coil 24.

Moreover, the motor side heat radiating sheet 25 is disposed separately for each coil 24 (for each tooth 22). The shape of each motor-side heat radiation sheet 25 is formed in a substantially square shape in an axial plan view so as to cover the bottom 13 side of the second motor case 7 in each coil. The motor-side heat radiation sheet 25 is fitted between the outer peripheral wall 23b and the inner peripheral wall 23c of the insulator 23.
In addition, since the motor side heat radiating sheet 25 is formed of a soft material, even when the formation error of the motor side heat radiating sheet 25 becomes large, the motor side heat radiating sheet 25 is not inserted into the insulator 23. Deform. For this reason, the motor-side heat radiation sheet 25 can be easily fitted into the insulator 23.

(Rotor)
5 is a perspective view of the rotor 9 as viewed from the bottom 13 side of the second motor case 7, FIG. 6 is a perspective view of the rotor 9 as viewed from the speed reduction portion 3, and FIG. 7 is a view as viewed from the arrow C in FIG. 8 is a cross-sectional view taken along the line DD of FIG.
As shown in FIGS. 2 and 5 to 8, the rotor 9 provided to be rotatable with respect to the stator 8 includes a rotating shaft 31, a cylindrical rotor core 32 that is externally fixed to the rotating shaft 31, and a rotor core. A ring-shaped magnet 33 fitted to the outer peripheral surface of the rotor 32, two magnet pressers 34A and 34B provided at both axial ends of the rotor core 32 to prevent the magnet 33 from coming off from the rotor core 32 in the axial direction; It has.

  The rotating shaft 31 is integrally formed with the worm shaft 44 that constitutes the speed reducing portion 3. The rotor core 32 is formed by laminating a plurality of metal plates in the axial direction. The rotor core 32 is not limited to the case where a plurality of metal plates are laminated in the axial direction, and may be formed, for example, by press-molding soft magnetic powder.

A through hole 32 a penetrating in the axial direction is formed at the substantially center in the radial direction of the rotor core 32. The rotary shaft 31 is press-fitted into the through hole 32a. Alternatively, the rotary shaft 31 may be inserted into the through hole 32a, and the rotor core 32 may be externally fixed to the rotary shaft 31 using an adhesive or the like.
In addition, a plurality of (for example, two) caulking fixing holes 32b (see FIG. 8) are formed through the rotor core 32 along the axial direction around the through hole 32a. The caulking fixing hole 32b is used to fix the rotor core 32 and the magnet pressers 34A and 34B.

  The magnet 33 fitted to the outer peripheral surface of the rotor core 32 is magnetized so that a plurality of magnetic poles are formed in order in the circumferential direction. For example, in this embodiment, the magnet 33 is magnetized to four poles. Note that the two-dot chain line shown in the magnet 33 in FIG. That is, the magnetic pole of the magnet 33 is skewed so as to be twisted (tilted) with respect to the axial direction.

Further, the axial length L2 of the magnet 33 is set substantially equal to the axial length L1 of the rotor core 32.
Furthermore, four concave portions 35 are formed at the end of the magnet 33 on the side of the bottom 13 of the second motor case 7 (the right end in FIG. 2 and the upper end in FIG. 5). The concave portions 35 are arranged at equal intervals in the circumferential direction, that is, so as to correspond to the magnetic poles. Further, the recess 35 is formed at the axial end of the magnet 33 over the entire thickness direction.

  Further, the recess 35 is formed so that the groove width in the circumferential direction gradually becomes narrower from the one axial end side toward the axial center. That is, as will be described in detail in FIG. 7, the concave portion 35 has a bottom surface 35a and two inclined surfaces 35b rising from both ends in the circumferential direction of the bottom surface 35a. As shown in detail in FIGS. 2 and 5, the bottom surface 35 a is formed flat in a direction orthogonal to the axial direction, and is formed in a rectangular shape in plan view when viewed from the axial direction.

(Magnet presser)
FIG. 9 is a perspective view of the magnet pressers 34A and 34B. Since the two magnet retainers 34A and 34B provided at both axial ends of the rotor core 32 have the same configuration, only the first magnet retainer 34A of the two magnet retainers 34A and 34B will be described below. The description of the second magnet presser 34B will be given as necessary.
As shown in detail in the drawing, the first magnet presser 34A is formed by pressing a metal plate. The first magnet presser 34 </ b> A includes an annular fixed portion 36, four arm portions 37 extending radially outward from the outer peripheral portion of the fixed portion 36, and presser claws 38 provided at the distal ends of the arm portions 37. Are integrally formed.

  The fixing portions 36 are disposed at both axial ends of the rotor core 32 and are fixed to the rotor core 32. The diameter D3 of the opening 36a of the fixed portion 36 is set to be slightly larger than the shaft diameter of the rotating shaft 31. The rotating shaft 31 is inserted through the opening 36 a, and the fixed portion 36 is disposed on the axial end surface of the rotor core 32. The fixing portion 36 is formed to have a size such that the outer peripheral portion slightly overlaps the caulking fixing hole 32 b formed in the rotor core 32 in the axial direction.

  Further, on the outer peripheral portion of the fixing portion 36, a fixing seat 39 that protrudes radially outward is integrally formed at a position corresponding to the caulking fixing hole 32b so as to close the caulking fixing hole 32b. . The fixed seats 39 are fixed to both ends of the rotor core 32 in the axial direction. The fixing seat 39 is formed with a through hole 39a communicating with the caulking fixing hole 32b.

The four arm portions 37 are formed in a belt shape and can be elastically deformed along the axial direction. Further, the four arm portions 37 are arranged at equal intervals in the circumferential direction. In other words, the magnet 33 is disposed so as to correspond to the recess 35.
Here, since the magnet 33 of this embodiment is magnetized to four poles, the arm portion 37 is provided so as to correspond to the number of magnetic poles and is arranged to correspond to each magnetic pole. become. Further, the arm portion 37 is formed so that the tip thereof is located near the outer peripheral portion of the magnet 33. The fixed seat 39 of the fixed portion 36 is formed so as to avoid the arm portion 37. That is, the through hole 39 a of the fixing seat 39 and the caulking fixing hole 32 b of the rotor core 32 are communicated at a position avoiding the arm portion 37.

The presser claw 38 provided at the tip of the arm portion 37 is for pressing both ends of the magnet 33 in the axial direction. The presser claw 38 is bent at a substantially right angle with respect to the extending direction of the arm portion 37 and protrudes from the tip of the arm portion 37 along the axial direction. The presser claw 38 has a tapered shape so as to correspond to the shape of the concave portion 35 of the magnet 33. That is, the presser claw 38 has a flat tip 38a and two inclined sides 38b formed on both sides in the circumferential direction and obliquely toward the tip 38a.
The axial height H4 of the presser claw 38 is set to be slightly longer than the axial depth H3 (see FIG. 7) of the concave portion 35 of the magnet 33.

  Under such a configuration, as shown in FIGS. 5 to 7, the first magnet presser 34 </ b> A of the two magnet pressers 34 </ b> A and 34 </ b> B is disposed on the side where the concave portion 35 of the magnet 33 is formed. . The first magnet presser 34 </ b> A is disposed so that the presser claw 38 is inserted into the recess 35. In a state where the presser claw 38 is inserted into the recess 35, the recess 35 and the presser claw 38 are in close contact with each other. That is, the tip 38 a of the presser claw 38 abuts on the bottom surface 35 a of the recess 35. Further, the inclined side 38 b of the presser claw 38 abuts on the inclined surface 35 b of the recess 35. For this reason, the first magnet presser 34 </ b> A has a role of positioning the magnet 33 in the circumferential direction with respect to the rotor core 32 and preventing circumferential displacement.

On the other hand, the second magnet presser 34 </ b> B is disposed on the side opposite to the side where the concave portion 35 of the magnet 33 is formed. The second magnet presser 34 </ b> B is disposed so that the protruding direction of the presser claw 38 is opposite to the magnet 33.
As described above, the second magnet presser 34 </ b> B has a role of positioning the rotor core 32 and the magnet 33 in the axial direction. Then, the magnet 33 is held in the axial direction by the first magnet presser 34A and the second magnet presser 34B. Thereby, the movement of the magnet 33 in the axial direction with respect to the rotor core 32 is restricted.

  Further, as shown in FIGS. 5 and 8, caulking pins 30 are respectively inserted into the through holes 39 a of the two magnet pressers 34 </ b> A and 34 </ b> B and the caulking fixing holes 32 b of the rotor core 32. Then, the tip of the caulking pin 30 is buckled and deformed, so that the rotor core 32 and the magnet presser 34 are integrated.

  Here, since the axial height H4 of the presser pawl 38 is set to be slightly longer than the axial depth H3 of the concave portion 35 of the magnet 33, the rotor core 32 and the magnet pressers 34A and 34B In the state of being integrated by the caulking pin 30, the presser claw 38 is slightly pushed up. For this reason, the arm portion 37 of the magnet 33 is elastically deformed so as to be slightly curved. The elastic force due to the elastic deformation of the arm portion 37 acts as a pressing force for pressing the presser claw 38 against the bottom surface 35 a of the recess 35. Thereby, the clamping force of the magnet 33 by the two magnet pressers 34A and 34B is increased.

(Decelerator)
10 is a cross-sectional view taken along line EE in FIG.
As shown in FIGS. 1, 2, and 10, the speed reduction unit 3 includes a gear case 40 to which the motor case 5 is attached, and a worm speed reduction mechanism 41 accommodated in the gear case 40. The gear case 40 is made of a material with excellent heat dissipation, such as aluminum die cast. The gear case 40 is formed in a box shape having an opening 40a on one surface, and has a gear housing portion 42 for housing the worm reduction mechanism 41 therein. The side wall 40b of the gear case 40 is formed with an opening 43 that communicates the through hole 10a of the first motor case 6 and the gear housing portion 42 at a location where the first motor case 6 is integrally formed. Yes.

  Further, three fixing brackets 54a, 54b, 54c are integrally formed on the side wall 40b of the gear case 40. These fixing brackets 54a, 54b and 54c are for fixing the motor 1 with a speed reducer to a vehicle body (not shown) or the like. The three fixing brackets 54a, 54b, 54c are arranged at substantially equal intervals in the circumferential direction so as to avoid the motor unit 2. Anti-vibration rubber 55 is attached to each of the fixed brackets 54a, 54b, 54c. The anti-vibration rubber 55 is for preventing vibrations when driving the motor 1 with a speed reducer from being transmitted to a vehicle body (not shown).

  Further, a substantially cylindrical bearing boss 49 projects from the bottom wall 40 c of the gear case 40. The bearing boss 49 is for rotatably supporting the output shaft 48 of the worm reduction mechanism 41, and a sliding bearing 50 is provided on the inner peripheral surface. Further, an O-ring 51 is attached to the inner peripheral edge of the front end of the bearing boss 49. This prevents dust and water from entering from the outside to the inside via the bearing boss 49. A plurality of ribs 52 are provided on the outer peripheral surface of the bearing boss 49. Thereby, the rigidity of the bearing boss 49 is ensured.

  The worm speed reduction mechanism 41 housed in the gear housing portion 42 includes a worm shaft 44 and a worm wheel 45 that meshes with the worm shaft 44. The worm shaft 44 is disposed coaxially with the rotation shaft 31 of the motor unit 2. The worm shaft 44 is rotatably supported by bearings 46 and 47 provided on the gear case 40 at both ends. The end of the worm shaft 44 on the motor unit 2 side protrudes to the opening 43 of the gear case 40 through the bearing 46. The projecting end portion of the worm shaft 44 and the end portion of the rotating shaft 31 of the motor unit 2 are joined, and the worm shaft 44 and the rotating shaft 31 are integrated.

  The worm wheel 45 meshed with the worm shaft 44 is provided with an output shaft 48 at the center in the radial direction of the worm wheel 45. The output shaft 48 is arranged coaxially with the rotation axis direction of the worm wheel 45, and protrudes to the outside of the gear case 40 via the bearing boss 49 of the gear case 40. A spline 48a (see FIG. 1) that can be connected to an electrical component (not shown) is formed at the protruding tip of the output shaft 48.

  Further, a sensor magnet 53 is provided at the center in the radial direction of the worm wheel 45 on the side opposite to the side from which the output shaft 48 protrudes. The sensor magnet 53 constitutes one of rotational position detectors 60 that detect the rotational position of the worm wheel 45. The magnetic detection element 61 that constitutes the other of the rotational position detection unit 60 is provided in the controller unit 4 that is disposed opposite to the worm wheel 45 on the sensor magnet 53 side (opening 40a side of the gear case 40) of the worm wheel 45. ing.

(Controller part)
The controller unit 4 that controls the drive of the motor unit 2 includes a controller board 62 on which the magnetic detection element 61 is mounted, and a cover 63 provided so as to close the opening 40a of the gear case 40. And the controller board | substrate 62 is opposingly arranged by the sensor magnet 53 side (opening 40a side of the gear case 40) of the worm wheel 45. As shown in FIG.

  The controller board 62 is obtained by forming a plurality of conductive patterns (not shown) on a so-called epoxy board. The controller board 62 is formed in a rectangular shape that is long in the direction orthogonal to the worm shaft 44 (left and right direction in FIG. 10). The magnetic detection element 61 is mounted on the one surface 62 a of the controller board 62 on the worm wheel 45 side and at a position corresponding to the sensor magnet 53 of the output shaft 48.

  The controller board 62 is connected to a terminal portion of the coil 24 drawn from the stator core 20 of the motor unit 2, and is electrically connected to a terminal 64 a of a connector 64 provided on the cover 63. Further, on the other surface 62b opposite to the one surface 62a of the controller board 62 (on the opening 40a side of the gear case 40), switching such as an FET (Field Effect Transistor) for controlling the current supplied to the coil 24 is performed. A power module 65 composed of elements, a capacitor 59 for smoothing a voltage applied to the controller board 62, and the like are mounted.

  A heat conduction plate 67 is attached to the power module 65 via a controller-side first heat dissipation sheet 66. The heat conduction plate 67 is formed in a band shape and a cross-sectional crank shape so as to be long along the longitudinal direction (the left-right direction in FIG. 10) of the controller substrate 62. That is, the heat conducting plate 67 is connected to the worm speed reduction mechanism 41 side from the end of the plate main body 68 disposed on the power module 65 and the side of the plate main body 68 where the worm speed reduction mechanism 41 is disposed (left side in FIG. 10). After being bent to the lower side in FIG. 10, the sub-plate 69 further extends so as to be parallel to the plate body 68.

The width of the plate body 68 in the short direction is set to such a size that the entire upper surface of the power module 65 is covered by the plate body 68.
On the other hand, the sub plate 69 is formed so that the tip (the side opposite to the plate main body 68) protrudes from the end of the controller board 62. Further, the tip of the sub plate 69 extends to the end of the side wall 40 b of the gear case 40. Then, at the tip of the sub plate 69, one surface 69 a on the controller board 62 (worm reduction mechanism 41) side is in contact with the side wall 40 b of the gear case 40 via the controller side second heat radiating sheet 71.

The cover 63 covering the controller board 62 and the heat conducting plate 67 configured in this manner is made of resin and is formed so as to bulge slightly outward. The inner surface side of the cover 63 serves as a controller housing portion 56 that houses the controller board 62 and the heat conduction plate 67.
As shown in detail in FIG. 1, a connector 64 is integrally formed on the outer periphery of the cover 63. The connector 64 is formed so as to be fitted with a connector extending from an external power source (not shown). The terminal 64 a of the connector 64 extends in and out of the connector 64. The inner end of the terminal 64a is electrically connected to the controller board 62. As a result, the power of the external power supply is supplied to the controller board 62.

  Further, a fitting portion 82 is formed at the opening edge of the cover 63 so as to be fitted to the end portion of the side wall 40 b of the gear case 40. The fitting part 82 is constituted by two walls 81 a and 81 b along the opening edge of the cover 63. And the edge part of the side wall 40b of the gear case 40 is inserted (fitted) between these two walls 81a and 81b. As a result, a labyrinth portion 83 is formed between the gear case 40 and the cover 63. The labyrinth 83 prevents dust and water from entering between the gear case 40 and the cover 63. The gear case 40 and the cover 63 are fixed by fastening a bolt (not shown).

(Operation of motor with reduction gear)
Next, operation | movement of the motor 1 with a reduction gear is demonstrated.
In the motor 1 with a speed reducer, the power supplied to the controller board 62 via the connector 64 is selectively supplied to each coil 24 of the motor unit 2 via the power module 65. Then, a predetermined magnetic field is formed in the stator 8 (the teeth 22), and a magnetic attractive force and a repulsive force are generated between the magnetic field and the magnet 33 of the rotor 9. Thereby, the rotor 9 rotates continuously.
When the rotor 9 rotates, the worm shaft 44 integrated with the rotating shaft 31 rotates, and further the worm wheel 45 meshed with the worm shaft 44 rotates. Then, the output shaft 48 connected to the worm wheel 45 rotates to drive a desired electrical component.

  Further, the rotational position detection result of the worm wheel 45 detected by the magnetic detection element 61 mounted on the controller board 62 is output as a signal to an external device (not shown) via the connector 64. An external device (not shown) outputs a drive signal for the power module 65 based on the rotational position detection signal for the worm wheel 45. Thereby, the switching timing of the switching element of the power module 65 is controlled, and the drive control of the motor unit 2 is performed.

(Heat transfer path and action of each heat dissipation sheet)
Next, based on FIG. 2, FIG. 10, the heat transfer path | route of the motor 1 with a reduction gear and the effect | action of each thermal radiation sheet | seat 25,66,71 are demonstrated.
First, the heat transfer path of the motor unit 2 will be described with reference to FIG.
As shown in the figure, when power is supplied to the coil 24 of the motor unit 2, the coil 24 generates heat due to the resistance of the coil 24. This heat is also transmitted to the stator core 20.

  Heat generated by the coil 24 is transmitted to the second motor case 7 out of the two motor cases 6 and 7 through the motor-side heat dissipation sheet 25. While the second motor case 7 is fitted to the first motor case 6, a gap S <b> 1 is formed between the second motor case 7 and the stator core 20. For this reason, the heat transmitted to the second motor case 7 is not transmitted to the stator core 20, but is radiated by the second motor case 7 itself or transmitted to the first motor case 6.

  On the other hand, the heat transmitted from the coil 24 to the stator core 20 is transmitted to the first motor case 6 in which the stator core 20 is fitted and fixed. Since the first motor case 6 is integrally formed with the gear case 40, the first motor case 6 and the gear case 40 dissipate heat transmitted from the second motor case 7 in addition to heat transmitted from the stator core 20. .

  Incidentally, the motor-side heat radiation sheet 25 is formed of a material that is softer than the motor case 5 and the coil 24. Thereby, the motor-side heat radiation sheet 25 can be brought into close contact with the bottom portion 13 of the second motor case 7 and the coil 24. Further, since the motor-side heat radiation sheet 25 is formed of a soft material, vibration generated in the stator core 20 when the motor unit 2 is driven can be absorbed by the motor-side heat radiation sheet 25. For this reason, vibration is prevented from being transmitted to the second motor case 7. Furthermore, since the motor-side heat dissipation sheet 25 can also suppress the vibration of the stator core 20 itself, the transmission of vibration to the first motor case 6 side is also suppressed.

Next, the heat transfer path of the controller unit 4 will be described with reference to FIG.
As shown in the figure, in the controller unit 4, the power module 65 that selectively supplies power from an external power source (not shown) to each coil 24 generates heat. The heat generated by the power module 65 is transmitted to the heat conduction plate 67 via the controller-side first heat dissipation sheet 66.

  Here, since the cover 63 covering the heat conduction plate 67 is formed of resin, the heat of the heat conduction plate 67 is not efficiently transmitted to the cover 63. Instead, since the sub-plate 69 of the heat conducting plate 67 is in contact with the gear case 40 via the controller-side second heat dissipating sheet 71, the heat of the heat conducting plate 67 is efficiently transmitted to the gear case 40. . This heat is radiated by the gear case 40.

  By the way, the controller side heat radiation sheets 66 and 71 affixed to the heat conduction plate 67 do not attach one heat radiation sheet to the entire surface of the heat conduction plate 67, but the controller side first heat radiation sheet 66 and the controller. The second side heat radiating sheet 71 is divided and attached to the plate body 68 and the sub plate 69, respectively. For this reason, when removing the controller board | substrate 62 from the gear case 40, for example, when maintaining the controller part 4 etc., it is sufficient to replace only the controller-side second heat radiation sheet 71. On the other hand, the controller side first heat radiation sheet 66 is not required to be replaced unless the heat conduction plate 67 is removed from the power module 65.

(Assembly method of rotor)
Next, a method for assembling the rotor 9 will be described with reference to FIGS.
First, after the fixing portion 36 of the second magnet presser 34 </ b> B is inserted into the rotating shaft 31, the rotor core 32 is externally fixed to the rotating shaft 31. At this time, the second magnet presser 34 </ b> B is set so that the presser claw 38 faces the side opposite to the rotor core 32.
Subsequently, the magnet 33 before magnetization is fitted to the outer peripheral surface of the rotor core 32. At this time, the concave portion 35 formed in the magnet 33 is directed to the opposite side to the second magnet presser 34 </ b> B, and is fitted to the outer peripheral surface of the rotor core 32. Further, it is not necessary to apply an adhesive or the like between the rotor core 32 and the magnet 33.

Next, the fixing portion 36 of the first magnet presser 34 </ b> A is inserted into the rotation shaft 31 from above the rotor core 32 (from the opposite end of the rotor core 32 to the second magnet presser 34 </ b> B). At this time, the presser claw 38 of the first magnet presser 34 </ b> A is inserted into the recess 35 of the magnet 33.
Subsequently, the caulking pins 30 are inserted into the through holes 39 a of the fixing portions 39 of the magnet pressers 34 A and 34 B and the caulking fixing holes 32 b of the rotor core 32. And the front-end | tip of the crimping pin 30 is buckled and deformed. Thereby, the rotor core 32, the magnet 33, and each magnet presser 34A, 34B are integrated.

  Here, the concave portion 35 is formed so that the circumferential groove width gradually decreases from the one axial end side toward the axial center, while the presser claw 38 has the shape of the concave portion 35 of the magnet 33. It has a tapered shape to correspond. For this reason, when the inclined surface 35 b of the recess 35 and the inclined side 38 b of the presser claw 38 abut, the force for pressing the magnet 33 of the presser claw 38 also acts in the circumferential direction of the magnet 33. Thereafter, the magnet 33 is magnetized to complete the assembly of the rotor 9.

  Thus, in the above-described first embodiment, the magnet pressers 34A and 34B are provided at both ends of the rotor core 32, respectively. The magnet pressers 34A and 34B include an annular fixed portion 36, four arm portions 37 extending radially outward from the outer peripheral portion of the fixed portion 36, and presser claws 38 provided at the distal ends of the arm portions 37. , Is configured. Then, after the fixing portion 36 is inserted into the rotating shaft 31, the magnet 33 is attached to the rotor core 32 simply by inserting the caulking pin 30 into the through hole 39 a of the fixing portion 39 and the caulking fixing hole 32 b of the rotor core 32. Can be fixed.

Thus, since the magnet 33 can be fixed to the rotating shaft 31 without using an adhesive or the like, the assembly of the magnet 33 to the rotor core 32 can be facilitated and the manufacturing cost can be reduced. Further, since each arm portion 37 is configured to be elastically deformable, the magnet 33 can be securely pressed by the presser claws 38 of the magnet pressers 34A and 34B. Therefore, the magnet 33 can be reliably fixed to the rotor core 32 while absorbing manufacturing errors of the rotor core 32 and the magnet 33 to some extent.
Furthermore, since the entire outer surface of the magnet 33 is exposed while using the magnet pressers 34A and 34B, the effective magnetic flux of the magnet 33 is not reduced. For this reason, it can prevent that the physique of the motor part 2 enlarges.

  Further, by adopting the belt-like arm portion 37 as an elastic portion for pressing the presser claw 38, the entire axial end portions of the rotor core 32 and the magnet 33 are not covered by the magnet pressers 34A and 34B. For this reason, the weight of the rotor 9 can be reduced, and the material cost of the magnet retainers 34A and 34B can be reduced. By using the belt-like arm portion 37, the arm portion 37 can be easily elastic.

Further, the number of arm portions 37 is set to four, which is the same as the number of poles of the magnet 33. And the arm part 37 is arrange | positioned so as to correspond to each magnetic pole. For this reason, the magnetic flux leakage of the magnet 33 can be suppressed via the magnet pressers 34A and 34B, and the motor performance of the motor unit 2 can be prevented from deteriorating.
Further, the concave portion 35 is formed in the magnet 33, while the presser claws 38 of the magnet pressers 34 </ b> A and 34 </ b> B are bent so as to be inserted into the concave portion 35. For this reason, it is possible to prevent the magnet 33 from being displaced in the circumferential direction with respect to the rotor core 32, and it is possible to reliably increase the fixing force of the magnet 33 to the rotor core 32.

  Further, the concave portion 35 of the magnet 33 is formed so that the circumferential groove width gradually decreases from the one axial end side toward the axial center. On the other hand, the presser claws 38 of the magnet pressers 34 </ b> A and 34 </ b> B are tapered so as to correspond to the shape of the recess 35 of the magnet 33. For this reason, when the inclined surface 35 b of the recess 35 and the inclined side 38 b of the presser claw 38 abut, the force for pressing the magnet 33 of the presser claw 38 also acts in the circumferential direction of the magnet 33. For this reason, it becomes possible to determine the relative position of the magnet holders 34A, 34B and the magnet 33 in the circumferential direction with high accuracy, and to prevent the magnet 33 from rattling with respect to the magnet holders 34A, 34B.

  The axial height H4 of the presser pawl 38 is set to be slightly longer than the axial depth H3 of the concave portion 35 of the magnet 33. For this reason, in a state where the rotor core 32 and the magnet pressers 34A and 34B are integrated by the caulking pin 30, the presser claw 38 is slightly pushed up. Thereby, the arm part 37 of the magnet 33 is elastically deformed so as to be slightly curved. The elastic force due to the elastic deformation of the arm portion 37 acts as a pressing force for pressing the presser claw 38 against the bottom surface 35 a of the recess 35. For this reason, the clamping force of the magnet 33 by the two magnet pressers 34A and 34B can be increased.

  Further, a caulking fixing hole 32b is formed in the rotor core 32, and a through hole 39a is formed in the fixing portion 39 of each magnet presser 34A, 34B. The caulking pin 30 is inserted into the caulking fixing hole 32b and the through hole 39a, and the tip of the caulking pin 30 is buckled and deformed. Thereby, the magnet pressers 34 </ b> A and 34 </ b> B are fixed to the rotor core 32. For this reason, each magnet presser 34A, 34B can be reliably fixed to the rotor core 32, and the fixing force of the magnet 33 to the rotor core 32 can be increased reliably.

  In addition, the motor case 5 of the motor unit 2 includes a first motor case 6 and a second motor case 7 that are configured to be separable in the axial direction. The inner diameter D <b> 2 of the peripheral wall portion 14 in the second motor case 7 is set such that a gap S <b> 1 is formed between the inner peripheral surface of the peripheral wall portion 14 and the outer peripheral surface of the core portion 21 of the stator 8. In addition, a motor-side heat radiation sheet 25 is provided between the bottom 13 of the second motor case 7 and the coil 24 wound around the stator 8. For this reason, the heat of the coil 24 can be directly transmitted to the second motor case 7. Moreover, the heat transmitted to the second motor case 7 can be radiated by the second motor case 7 or can be transmitted to the first motor case 6 with almost no return to the stator core 20. Therefore, the cooling efficiency of the motor unit 2 can be reliably increased.

Further, the heat of the coil 24 is transmitted to the second motor case 7 by using a motor side heat radiation sheet 25 which is a separate body from the second motor case 7. For this reason, the 2nd motor case 7 can be made into a simple structure compared with the case where the heat conductive member replaced with the motor side heat radiating sheet 25 is integrally molded with the 2nd motor case 7. FIG. Therefore, the manufacturing cost of the second motor case 7 can be reduced.
In addition, the heat of the coil 24 can be reliably transmitted to the second motor case 7 via the motor-side heat dissipation sheet 25 regardless of manufacturing errors of the second motor case 7 and the stator 8 (stator core 20). For this reason, the cooling efficiency of the motor part 2 can be improved more reliably.

  Furthermore, the motor-side heat dissipation sheet 25 is disposed separately for each coil 24. The shape of each motor-side heat radiation sheet 25 is formed in a substantially square shape in an axial plan view so as to cover the bottom 13 side of the second motor case 7 in each coil. For this reason, for example, it is possible to easily cut out a plurality of motor-side heat radiation sheets 25 from one heat radiation sheet 25. That is, the motor-side heat radiation sheet 25 can be easily formed, and the production yield of the motor-side heat radiation sheet 25 can be increased.

  In addition, since the motor-side heat dissipation sheet 25 is formed of a soft material, even when the formation error of the motor-side heat dissipation sheet 25 has increased, the motor-side heat dissipation sheet 25 is inserted into the insulator 23 when the motor-side heat dissipation sheet 25 is fitted. Deform. For this reason, the motor-side heat radiation sheet 25 can be easily fitted into the insulator 23. Furthermore, the motor-side heat radiation sheet 25 can be easily adhered to each of the bottom portion 13 of the second motor case 7 and the coil 24.

  Further, since the motor-side heat radiation sheet 25 is formed of a soft material, vibration generated in the stator core 20 when the motor unit 2 is driven can be absorbed by the motor-side heat radiation sheet 25, and the second motor case 7 It is prevented that vibration is transmitted. Furthermore, since the motor-side heat dissipation sheet 25 can also suppress the vibration of the stator core 20 itself, the transmission of vibration to the first motor case 6 side is also suppressed.

  Furthermore, the insulator 23 attached to the stator core 20 includes a bottom portion 23a, an outer peripheral wall 23b erected on the radially outer side of the bottom portion 23a, and an inner peripheral wall 23c erected on the radially inner side of the bottom portion 23a. Has been. The height H1 of the inner peripheral wall 23c is set higher than the height H2 of the outer peripheral wall 23b. For this reason, when the motor side heat radiating sheet 25 is fitted between the outer peripheral wall 23b of the insulator 23 and the inner peripheral wall 23c by the inner peripheral wall 23c, the motor side heat radiating sheet 25 is prevented from moving radially inward. it can. Therefore, it can prevent that the rotor 9 and the motor side thermal radiation sheet | seat 25 contact, and can stabilize the operation | movement of the motor part 2. FIG.

Further, since the gear case 40 and the first motor case 6 are integrated, a large area for dissipating the heat transmitted to the first motor case 6 can be secured. For this reason, the cooling effect of the motor unit 2 can be further enhanced.
Further, the rotation shaft 31 of the motor unit 2 and the worm shaft 44 of the speed reduction unit 3 are integrated, and only the worm shaft 44 is rotatably supported by bearings 46 and 47 provided in the gear case 40. For this reason, it is not necessary to provide the motor case 5 (the first motor case 6 and the second motor case 7) with a bearing for rotatably supporting the rotary shaft 31. Therefore, the structure of the motor case 5 can be simplified, and the product cost of the motor case 5 can be reduced. In addition, since it is not necessary to center the two motor cases 6 and 7 with high accuracy, the assembling property of the motor case 5 can be improved.

  The controller unit 4 that controls the drive of the motor unit 2 includes a heat conduction plate 67 that is attached to the power module 65 of the controller board 62 via the controller-side first heat radiation sheet 66. The heat conduction plate 67 has a front surface 69 a (one surface 69 a of the sub plate 69) on the side of the controller board 62 (worm reduction mechanism 41) at the front end of the sub plate 69. It is in contact with the side wall 40b. In this way, the heat of the controller board 62 is efficiently transmitted to the gear case 40 side having a large heat radiation area, not the cover 63, via the heat conductive plate 67. For this reason, it is not necessary to separately provide a structure for dissipating heat from the controller unit 4, and the motor 1 with a reduction gear can be reduced in size.

Further, the controller-side heat radiation sheets 66 and 71 attached to the heat conduction plate 67 do not attach one heat radiation sheet to the entire surface of the heat conduction plate 67. In other words, the controller side first heat radiation sheet 66 and the controller side second heat radiation sheet 71 are divided and configured to be separately attached to the plate body 68 and the sub plate 69, respectively. For this reason, when removing the controller board | substrate 62 from the gear case 40, for example, when maintaining the controller part 4 etc., it is sufficient to replace only the controller-side second heat radiation sheet 71. The controller side first heat radiation sheet 66 is not required to be replaced unless the heat conduction plate 67 is removed from the power module 65.
As a result, it is possible to reduce costs during maintenance. Moreover, by dividing | segmenting into the controller side 1st heat radiating sheet 66 and the controller side 2nd heat radiating sheet 71, each heat radiating sheet 66 and 71 can be made into the required minimum magnitude | size. Therefore, the product cost of the motor 1 with a reduction gear can be suppressed.

The controller board 62 is disposed opposite to the sensor magnet 53 side of the worm wheel 45.
Here, the heat conduction plate 67 has one surface 69 a on the controller board 62 side (one surface 69 a on the sub plate 69) in contact with the side wall 40 b of the gear case 40 via the controller-side second heat radiation sheet 71. That is, it is not necessary to arrange components for increasing the cooling efficiency of the controller board 62 on the surface opposite to the heat conduction plate 67 of the controller board 62, and there is a space. For this reason, when the worm wheel 45 and the controller board 62 are arranged to face each other, the space between the worm wheel 45 and the controller board 62 can be made as narrow as possible. Therefore, the motor 1 with a reduction gear can be reduced in size.

  Further, by narrowing the space between the worm wheel 45 and the controller board 62 as much as possible, the sensor magnet 53 of the worm wheel 45 and the magnetic detection element 61 mounted on the controller board 62 can be arranged as close as possible. For this reason, it becomes possible to detect the magnetic change of the sensor magnet 53 by the magnetic detection element 61 with high precision, and the performance of the motor 1 with a reduction gear can be improved.

  Further, since the controller unit 4 is arranged using the gear case 40 and the cover 63, it is not necessary to secure a useless space in the motor unit 2 and the like. For this reason, the whole motor 1 with a reduction gear can be reduced in size. Furthermore, by disposing the gear case 40 and the controller unit 4 close to each other, a heat radiation area for radiating heat from the controller board 62 can be increased. That is, the gear case 40 can be effectively used as a heat radiating part. For this reason, the cooling efficiency of the controller board 62 can be further increased.

(Modification of the first embodiment)
Next, a modification of the first embodiment will be described based on FIG.
FIG. 11 is an enlarged cross-sectional view of the recess 35 formed in the magnet 33 of the rotor 9, and FIG. 12 is a plan view of the rotor 9 viewed from one axial direction.
Here, in the first embodiment described above, the bottom surface 35a of the recess 35 formed in the magnet 33 is formed flat in a direction orthogonal to the axial direction, and the planar view viewed from the axial direction is rectangular. The case where it was formed was explained. However, the bottom surface 35a may be formed as follows.

That is, as shown in FIG. 11, the bottom surface 35a may be inclined such that the groove depth gradually increases from the radially outer side toward the radially inner side. Further, as shown in FIG. 12, the bottom surface 35a may be formed so as to widen toward the end so that the circumferential groove width gradually increases from the radially outer side toward the radially inner side.
With such a configuration, when the concave portion 35 of the magnet 33 is pressed by the presser claws 38 of the magnet pressers 34A and 34B, this pressing force acts toward the radially outer side of the magnet 33 (for example, FIG. See arrow). For this reason, the movement of the magnet 33 in the radial direction with respect to the rotor core 32 can be suppressed, and rattling of the magnet 33 can be suppressed.

  In the first embodiment and the modification described above, when assembling the rotor 9, first, the fixing portion 36 of the second magnet presser 34 </ b> B is inserted into the rotating shaft 31, and then the rotor core 32 is externally fixed to the rotating shaft 31. Explained when to do. However, the present invention is not limited to this. For example, when the rotating shaft 31 and the worm shaft 44 are not integrated, after the rotor core 32 is fitted and fixed to the rotating shaft 31, magnets are respectively attached to both ends of the rotor core 32 in the axial direction. The pressers 34A and 34B may be arranged.

  In the first embodiment and the modification described above, the case where the magnet pressers 34 </ b> A and 34 </ b> B are fixed to the rotor core 32 using the caulking pins 30 has been described. However, the present invention is not limited to this, and a bolt may be used in place of the caulking pin 30, and the magnet pressers 34 </ b> A and 34 </ b> B may be fastened and fixed to the rotor core 32 by this bolt.

(Second Embodiment)
Next, a second embodiment of the present invention will be described based on FIGS. In addition, the same code | symbol is attached | subjected to the aspect same as 1st Embodiment, and description is abbreviate | omitted (same also about the following embodiment).
FIG. 13 is a perspective view of the rotor 209 according to the second embodiment, and corresponds to FIG. 5 of the above-described embodiment. 14 is a cross-sectional view taken along line FF in FIG.

(Rotor)
As shown in FIGS. 13 and 14, the rotor core 232 of the rotor 209 is formed by laminating a plurality of metal plates 91 in the axial direction. The plurality of metal plates 91 have four caulking bosses 92 formed by pressing. These caulking bosses 92 are arranged at equal intervals in the circumferential direction. The plurality of metal plates 91 are integrated by overlapping and crimping these bosses 92.

(Magnet presser)
Here, each magnet presser 234A, 234B of the second embodiment is configured to be fixed to the rotor core 232 using the boss 92 of the rotor core 232. This point is different from the magnet pressers 34A and 34B of the first embodiment described above.

FIG. 15 is a perspective view of the magnet retainers 234A and 234B as viewed from one side, and FIG. 16 is a perspective view of the magnet retainers 234A and 234B as viewed from the other side.
As shown in FIGS. 15 and 16, a fixing seat 39 (see FIG. 9) for fixing the magnet holders 234 </ b> A and 234 </ b> B to the rotor core 232 is not integrally formed with the fixing portion 236 of the magnet holders 234 </ b> A and 234 </ b> B. Instead of the fixing seat 39, four bosses 93 that are caulked and fixed to the boss 92 are formed in the fixing portion 236 at positions corresponding to the boss 92 of the rotor core 232.

The boss 93 is formed so as to protrude in the same direction as the direction in which the presser claw 38 protrudes, for example, by pressing. The surface of the fixing portion 236 opposite to the side from which the presser claw 38 protrudes is recessed so that the position corresponding to the boss 93 can be fitted to another boss 93.
The protruding direction of the boss 93 is not limited, and the protruding direction may be changed according to the protruding direction of the boss 92 of the rotor core 232. In other words, of the two magnet pressers 234A and 234B, the bosses are arranged so that the presser claw 38 of the first magnet presser 234A arranged on the concave portion 35 side formed in the magnet 33 is oriented to be inserted into the concave portion 35. It is sufficient if 93 is protruded.

  Therefore, according to the second embodiment described above, the same effects as those of the first embodiment described above can be achieved. In addition to this, the magnet pressers 234A and 234B can be fixed using the boss 92 of the rotor core 232. Therefore, unlike the first embodiment described above, there is no need to form the caulking fixing constant holes 32b (see FIG. 8) for fixing the magnet pressers 34A and 34B to the rotor core 32. Therefore, the processing cost of the rotor core 32 can be reduced. Moreover, since it is not necessary to use the caulking pin 30, the number of parts can be reduced. In addition, since the caulking pin 30 does not protrude from both axial ends of the rotor core 232, the rotor 209 can be reduced in size.

  In the first embodiment, the modified example, and the second embodiment described above, the case where the four concave portions 35 are formed at one axial end of the magnet 33 has been described. Further, each magnet presser 34A, 34B, 234A, 234B includes a fixed portion 36, 236, four arm portions 37 extending from the outer peripheral portion of the fixed portion 36, 236, and a presser claw provided at the tip of each arm portion 37. A case has been described in which 38 is integrally formed. However, the present invention is not limited to this, and the number of concave portions 35 formed in the magnet 33 and the number of arm portions 37 provided in the magnet pressers 34A, 34B, 234A, 234B can be arbitrarily set. However, it is desirable to set the number of concave portions 35 and arm portions 37 according to the number of magnetic poles of the magnet 33. Thereby, the magnetic flux leakage of the magnet 33 resulting from the magnet pressers 34A, 34B, 234A, 234B can be suppressed.

  Further, the shape of the presser claw 38 and the shape of the arm portion 37 can be changed. The presser claw 38 only needs to have a shape capable of pressing the end of the magnet 33 in the axial direction. For example, the presser claw 38 may be formed in a ring shape in an axial plan view. Moreover, the arm part 37 should just be a structure which has elasticity while connecting the fixing | fixed parts 36 and 236 and the press claw 38 (pressing part which presses the axial direction edge part of the magnet 33).

(Third embodiment)
Next, based on FIGS. 17-21, 3rd Embodiment of this invention is described.
FIG. 17 is a perspective view of the rotor 309 in the third embodiment, and illustration of the rotating shaft 31 is omitted. 18 is a cross-sectional view taken along the line GG in FIG.
As shown in FIGS. 17 and 18, the difference between the first embodiment and the third embodiment described above is that the shape of the magnet retainers 34A and 34B of the first embodiment and the magnet retainers 334A and 334B of the third embodiment. The point is that the shape is different.

Further, the third embodiment is different from the first embodiment in the following points.
That is, the rotor core 332 is formed with four fixing holes 332b for fixing the magnet pressers 334A and 334B around the through hole 32a into which the rotating shaft 31 is inserted. These fixing holes 332b are formed so as to penetrate in the axial direction of the rotor core 332, and are arranged at equal intervals in the circumferential direction.
Further, the magnet 333 has recesses 35 at both ends in the axial direction. Each recess 35 formed on the same end is formed at four locations at equal intervals in the circumferential direction. Moreover, each recessed part 35 formed in the axial direction both ends is formed so that it may each oppose in an axial direction.

(Magnet presser)
FIG. 19 is a perspective view of the magnet pressers 334A and 334B. Since the two magnet retainers 334A and 334B provided at both axial ends of the rotor core 332 have the same configuration, only the first magnet retainer 334A of the two magnet retainers 334A and 334B will be described below. The description of the second magnet presser 334B will be given as necessary.

As shown in detail in the figure, the first magnet presser 334A is made of resin. The first magnet presser 334A has an annular fixing portion 336.
The fixing portions 336 are disposed at both axial ends of the rotor core 332 and are fixed to the rotor core 332. The diameter D4 of the opening 336a of the fixed portion 336 is set to be slightly larger than the shaft diameter of the rotating shaft 31. The rotary shaft 31 is inserted through the opening 336 a and the fixed portion 336 is disposed on the end surface in the axial direction of the rotor core 332.

Four arm portions 337 extending outward in the radial direction are integrally formed on the outer peripheral portion of the fixing portion 336, and a presser claw 338 is integrally formed at the tip of the arm portion 337.
The four arm portions 37 are arranged at equal intervals in the circumferential direction so as to correspond to the concave portions 35 of the magnet 333.

  A presser claw 338 provided at the tip of the arm portion 337 is for pressing the magnet 333 from the axial direction. The presser claw 338 is bent at a substantially right angle with respect to the extending direction of the arm portion 337 and protrudes from the tip of the arm portion 337 along the axial direction. The presser claw 338 has a tapered shape so as to correspond to the shape of the concave portion 35 of the magnet 333. That is, the presser claw 338 has a flat tip 338a and two inclined sides 338b formed on both sides in the circumferential direction and obliquely toward the tip 338a.

  In addition, four substantially cylindrical fixed seats 339 are integrally formed on the outer peripheral portion of the fixed portion 336 between the arm portions 337. Each fixing seat 339 is for fixing two magnet pressers 334A and 334B, and is arranged at equal intervals in the circumferential direction. Stepped through holes 339c are formed along the axial direction in the two fixed seats 339 facing each other across the opening 336a of the fixed portion 336 of the four fixed seats 339. The through hole 339c has a small diameter hole 339a formed on the side from which the presser claw 338 protrudes and a diameter opposite to the side from which the presser claw 338 protrudes, and has a diameter larger than that of the small diameter hole 339a. The formed large-diameter hole 339b is formed in communication. The inner diameter of the small diameter hole 339a is set to be substantially the same as the inner diameter of the fixing hole 332b of the rotor core 332.

  In addition, among the four fixed seats 339, two fixed seats 339 in which the through hole 339c is not formed are respectively provided with fixing columns 96 protruding. The fixed column 96 is a member in which the fixed column 96 and the fixed seat 339 cooperate to fix the two magnet pressers 334A and 334B (details will be described later).

  The fixed column 96 protrudes in the same direction as the pressing direction of the presser claw 338. The length L3 of the fixed column 96 is set to be sufficiently longer than the axial length L4 of the rotor core 332. Furthermore, the shaft diameter of the fixed column 96 is set to be the same as or slightly smaller than the inner diameter of the small diameter hole 339a of the through hole 339c formed in the fixed seat 339. Further, the tip of the fixed column 96 is a tapered portion 98. The tapered portion 98 becomes a heat caulking portion 97 (see FIG. 17) when the two magnet pressers 334A and 334B are fixed to each other.

  Further, an auxiliary presser 95 is integrally formed on the outer peripheral portion of the fixed seat 339 on the side opposite to the opening 336a with the through hole 339c interposed therebetween. The auxiliary presser 95 is to prevent the magnet 333 from rattling. The auxiliary presser 95 is bent in the same direction as the protruding direction of the presser claw 338 from the distal end of the extended portion 95a and an extended portion 95a extending from the outer peripheral portion of the fixed seat 339 along the direction orthogonal to the axial direction. The extending wedge portion 95b is integrally formed. The wedge portion 95b is formed in a wedge shape so that the thickness gradually decreases toward the tip.

(Assembly method of rotor)
Next, a method for assembling the rotor 309 will be described.
First, the rotor core 332 is fitted and fixed to the rotating shaft 31 (not shown in the third embodiment, see FIG. 5), and then the magnet 333 before magnetization is fitted to the outer peripheral surface of the rotor core 332. At this time, it is not necessary to apply an adhesive or the like between the rotor core 332 and the magnet 333.

Next, the fixing pillar 96 of the first magnet presser 334 </ b> A is inserted into any two fixing holes 332 b of the rotor core 332 from one axial end side of the rotor core 332. Further, the fixing pillar 96 of the second magnet presser 334B is inserted into the remaining two fixing holes 332b of the rotor core 332 from the other axial end side of the rotor core 332.
At this time, as shown in FIGS. 17 and 18, the presser claws 338 of the magnet pressers 334 </ b> A and 334 </ b> B are inserted into the respective recesses 35 of the magnet 333. Further, between the outer peripheral surface of the rotor core 332 and the inner peripheral surface of the magnet 333, the wedge portion 95b of the auxiliary presser 95 of each magnet presser 334A, 334B is inserted.

FIG. 20 is an enlarged view of a portion H in FIG.
As shown in the figure, since the wedge portion 95b is formed in a wedge shape so that the thickness gradually decreases toward the tip, the wedge portion 95b is smoothly formed between the outer peripheral surface of the rotor core 332 and the inner peripheral surface of the magnet 333. Can be inserted into. By inserting the wedge portion 95 b between the outer peripheral surface of the rotor core 332 and the inner peripheral surface of the magnet 333, a radially outward force is applied to the magnet 333 with respect to the rotor core 332.

FIG. 21 is a perspective view in which the magnet pressers 334A and 334B are attached to both ends of the rotor core 332 in the axial direction, respectively, and the rotor core 332 is not shown.
As shown in the figure, in a state where the magnet pressers 334A and 334B are attached to both ends of the rotor core 332 in the axial direction, the other fixed column 96 is inserted into one through hole 339c of the two magnet pressers 334A and 334B. . And the front-end | tip of each fixed pillar 96 protrudes in the large diameter hole 339b through the small diameter hole 339a of the through-hole 339c, respectively.

  Under such a configuration, the tapered portion 98 of each fixed column 96 is heated and pressurized to form a heat caulking portion 97 (see FIG. 17) at the tip (tapered portion 98) of each fixed column 96. The heat caulking portion 97 is formed by expanding and deforming so as to spread over the large diameter hole 339b of the through hole 339c. For this reason, the heat crimping part 97 does not fall out from the small diameter hole 339a of the through hole 339c. Thereby, the rotor core 332, the magnet 333, and each magnet presser 334A, 334B are integrated. Thereafter, the magnet 333 is magnetized to complete the assembly of the rotor 9.

  Thus, in the above-described third embodiment, the magnet pressers 334A and 334B are provided at both ends of the rotor core 332, respectively. The magnet holders 334A and 334B include an annular fixed portion 336, four arm portions 337 extending radially outward from the outer peripheral portion of the fixed portion 336, and a presser claw 338 provided at the tip of the arm portion 337, have. Then, the fixing columns 96 of the first magnet presser 334A are inserted into the fixing holes 332b from both ends in the axial direction of the rotor core 332, and the fixing columns 96 of the second magnet presser 334B are inserted. The magnet 333 can be fixed to the rotor core 332 simply by forming the heat caulking portion 97 at the tip (tapered portion 98) of each fixed column 96.

  Thus, since the magnet 333 can be fixed to the rotating shaft 31 without using an adhesive or the like, the assembly of the magnet 333 to the rotor core 332 can be facilitated, and the manufacturing cost can be reduced. Further, concave portions 35 are formed at both ends of the magnet 333 in the axial direction, and the presser claws 338 of the magnet pressers 334A and 334B are inserted into the concave portions 35, respectively. For this reason, it is possible to increase the engagement force between the magnet pressers 334A and 334B and the magnet 333, and it is possible to prevent the magnet 333 from being displaced in the circumferential direction with respect to the rotor core 332. Therefore, the fixing force of the magnet 333 to the rotor core 332 can be reliably increased.

  Furthermore, the presser claws 338 of the magnet pressers 334A and 334B have a flat tip 338a and two inclined sides 338b formed on both sides in the circumferential direction and obliquely toward the tip 338a. For this reason, when the inclined surface 35b of the recess 35 (not shown in the third embodiment, see FIG. 7) and the inclined side 338b of the presser claw 338 abut, the force of pressing the magnet 333 of the presser claw 338 is reduced. It also acts in the circumferential direction of 333. Therefore, it is possible to determine the relative position in the circumferential direction between the magnet pressers 334A and 334B and the magnet 333 with high accuracy. Furthermore, the backlash of the magnet 333 with respect to the magnet pressers 334A and 334B can be prevented.

  In addition, the magnet pressers 334A and 334B have an auxiliary presser 95, and the wedge portion 95b of the auxiliary presser 95 is inserted between the outer peripheral surface of the rotor core 332 and the inner peripheral surface of the magnet 333. Due to the wedge portion 95b, a force directed radially outward against the rotor core 332 acts on the magnet 333. For this reason, the magnet 333 can be securely fixed to the rotor core 332 while preventing the magnet 333 from rattling against the rotor core 332.

  In the third embodiment described above, the fixed column 96 is erected on each magnet presser 334A, 334B. Then, the other fixing column 96 is inserted into one through hole 339c of the two magnet holders 334A and 334B, and a heat caulking portion 97 is formed at the tip (tapered portion 98) of each fixing column 96, thereby forming the rotor core 332. The case where the magnet pressers 334A and 334B are fixed has been described. However, the present invention is not limited to this, and any structure may be used as long as the fixing portions 336 of the magnet pressers 334A and 334B can be fixed to the rotor core 332, and the fixing pillar 96 may not be provided. For example, a convex portion that can be press-fitted into the fixing hole 332b of the rotor core 332 may be provided in the fixing portion 336 of each magnet presser 334A, 334B.

  In the third embodiment described above, the case where the four concave portions 35 are formed at both ends of the magnet 333 in the axial direction has been described. Further, each magnet presser 334A, 334B is integrally formed with a fixed portion 336, four arm portions 337 extending from the outer peripheral portion of the fixed portion 336, and a presser claw 338 provided at the tip of each arm portion 337. The case where it is a thing was demonstrated. However, the present invention is not limited thereto, and the number of recesses 35 formed in the magnet 333 and the number of arm portions 337 provided in the magnet pressers 334A and 334B can be arbitrarily set.

  Furthermore, the shape of the presser claw 338 and the shape of the arm portion 337 can be changed. The presser claw 338 only needs to have a shape capable of pressing the end of the magnet 333 in the axial direction. For example, the presser claw 338 may be formed in a ring shape in plan view in the axial direction. Moreover, the arm part 337 should just be the structure which can connect the fixing | fixed part 336 and the press nail | claw 338 (pressing part which presses the axial direction edge part of the magnet 333).

The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case where the motor 1 with a reduction gear is a drive source for electrical components (for example, a power window, a sunroof, an electric seat, etc.) mounted on the vehicle has been described. However, it is not restricted to this, The motor 1 with a reduction gear can be used for various uses.

Further, in the above-described embodiment, the case where the width of the plate body 68 in the heat conduction plate 67 in the short direction is set to such a size that the entire upper surface of the power module 65 is covered by the plate body 68 will be described. did. However, the present invention is not limited to this, and the size of the heat conducting plate 67 can be arbitrarily set. For example, the size of the heat conduction plate 67 (plate body 68) may be set to a size that covers the entire controller board 62.
By forming the heat conducting plate 67 in this way, it is possible to absorb radiation noise emitted from electronic components mounted on or connected to the controller board 62 by the heat conducting plate. That is, the role of the heat conduction plate 67 can be not only for the heat radiation of the controller unit 4 but also for the reduction of the radiation noise of the controller board 62.

  In the above-described embodiment, the case where the height H1 of the inner peripheral wall 23c of the insulator 23 is set higher than the height H2 of the outer peripheral wall 23b in the motor unit 2 has been described. However, the present invention is not limited to this, and at least on the side of the insulator 23 where the motor-side heat dissipation sheet 25 is provided, the axial height H1 of the inner peripheral wall 23c is higher than the axial height H2 of the outer peripheral wall 23b. It only has to be set.

  Furthermore, in the above-described embodiment, the case where the motor-side heat radiation sheet 25 is provided between the bottom portion 13 of the second motor case 7 and the coil 24 wound around the stator 8 has been described. However, the present invention is not limited to this, and the bottom portion 13 of the second motor case 7 may be raised, and the raised portion may be configured as a heat conduction member that transmits the heat of the coil 24 to the second motor case 7. Good. That is, this heat conducting member may be integrally formed on the bottom 13 of the second motor case 7.

  Moreover, although the case where the 2nd motor case 7 was formed in the bottomed cylindrical shape was demonstrated in the above-mentioned embodiment, a radiation fin etc. were provided in the bottom part 13 of the 2nd motor case 7, and the heat dissipation of the 2nd motor case 7 was carried out. May be further improved.

2 ... Motor part (motor)
8 ... Stator 9, 209, 309 ... Rotor 30 ... Caulking pin (fixing tool)
31 ... Rotating shaft 32, 232, 332 ... Rotor core 32b ... Caulking fixing hole (rotor side through hole)
33,333 ... Magnets 34A, 234A, 334A ... First magnet presser (magnet presser)
34B, 234B, 334B ... 2nd magnet presser (magnet presser)
35 ... concave portion 35a ... bottom surface 35b ... inclined surfaces 36, 236, 336 ... fixed portion 37 ... arm portion (arm, elastic connecting portion)
38,338 ... Presser claw (presser part, claw part)
38a, 338a ... tip 38b, 338b ... inclined side 39, 339 ... fixed seat 39a ... through hole (fixed side through hole)
95 ... Auxiliary presser 95b ... Wedge part 96 ... Fixing column 97 ... Heat caulking part 332b ... Fixing hole (rotor side through hole)
337 ... Arm part (arm, connecting part)
339c ... through hole (insertion hole)
H3 ... depth H4 ... height

Claims (11)

A rotation axis;
A cylindrical rotor core fixed to the rotating shaft;
A ring-shaped magnet fitted to the outer peripheral surface of the rotor core;
A magnet presser provided at both axial ends of the rotor core to prevent the magnet from coming off from the rotor core in the axial direction;
With
The magnet presser
A fixed portion fixed to an axial end portion of the rotor core;
A presser part for pressing the axial end of the magnet;
An elastic connecting portion provided so as to straddle the fixing portion and the pressing portion, and connecting the fixing portion and the pressing portion and having elasticity;
A rotor characterized by comprising: The elastic coupling part is composed of a plurality of arms extending radially outward from the fixed part,
The rotor according to claim 1, wherein the pressing portion is provided at a tip of the arm. The number of arms is set to the same number as the number of magnetic poles of the magnet,
The rotor according to claim 2, wherein each of the arms is disposed so as to correspond to each magnetic pole of the magnet. A claw portion bent toward the magnet side in the axial direction is formed at the tip of the presser portion,
The rotor according to claim 2 or 3, wherein a concave portion for receiving the claw portion is formed at an end portion in the axial direction of the magnet. The claw portion is tapered such that the claw width in the circumferential direction becomes narrower toward the tip,
5. The rotor according to claim 4, wherein the concave portion is inclined so that two inner surfaces facing each other in the circumferential direction correspond to the shape of the claw portion.   The extending length of the claw portion is set to be longer than the depth of the concave portion in a state where the axial end portion of the rotor core and the axial end portion of the magnet are arranged on the same plane. The rotor according to claim 4 or 5. The rotor core has a rotor side through hole penetrating in the axial direction;
The fixed part has a fixed part side through hole communicating with the rotor side through hole,
7. The fixing device according to claim 1, further comprising a fixing tool that is inserted into the rotor side through hole and the fixing portion side through hole and fixes the rotor core and the fixing portion. The described rotor. A rotation axis;
A cylindrical rotor core fixed to the rotating shaft;
A ring-shaped magnet fitted to the outer peripheral surface of the rotor core;
A magnet presser provided at both axial ends of the rotor core to prevent the magnet from coming off from the rotor core in the axial direction;
With
The magnet presser
A fixed portion fixed to an axial end portion of the rotor core;
A presser part for pressing the axial end of the magnet;
A connecting portion provided so as to straddle the fixing portion and the pressing portion, and connecting the fixing portion and the pressing portion;
A rotor characterized by comprising:   The said magnet presser is further provided with the auxiliary presser formed in the wedge shape so that it could insert in the clearance gap between the outer peripheral surface of the said rotor core, and the internal peripheral surface of the said magnet. Rotor. The rotor core has a rotor side through hole penetrating in the axial direction;
Of the two magnet pressers, the fixing part of one of the magnet pressers is provided with a fixing column protruding toward the other magnet presser side through the rotor side through hole,
Of the two magnet pressers, the other magnet presser has a fixing portion formed with an insertion hole through which the fixing column of one of the magnet pressers can be inserted,
The rotor according to claim 8 or 9, wherein a heat caulking portion for connecting the two magnet pressers is formed at a tip of the fixed column. The rotor according to any one of claims 1 to 10,
A stator that causes magnetic attraction and repulsion to the rotor by being energized, and rotates the rotor;
A motor comprising:

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