JP6922153B2 - Randel type rotor and Randel type motor - Google Patents

Description

The present invention relates to a Randell type rotor and a Randel type motor.

Conventionally, in a rotor of a motor, a Randell type motor including a pair of rotor cores having a plurality of claw-shaped magnetic poles in the circumferential direction and a Randell type rotor composed of a permanent magnet contained in the rotor core is known ( For example, see Patent Document 1). In the Randell type rotor, the claw-shaped magnetic poles of one rotor core and the claw-shaped magnetic poles of the other rotor core are alternately arranged in the circumferential direction, and the claw-shaped magnetic poles are alternately different due to the permanent magnet magnetized in the axial direction. It is designed to function as a magnetic pole.

Further, in such a Randell type rotor, an annular auxiliary magnet in which a back magnet provided on the back surface of the claw-shaped magnetic poles and an interpole magnet provided between each claw-shaped magnetic poles in the circumferential direction are integrally molded is adopted. (See, for example, FIG. 14 of Patent Document 2).

Japanese Unexamined Patent Publication No. 2015-80387 Japanese Unexamined Patent Publication No. 2014-117131

By the way, in the Randell type rotor as described above, it is conceivable to use a cushioning material between the annular auxiliary magnet and the rotor core. However, if the end face of the claw-shaped magnetic pole of the rotor core and the peripheral end face of the auxiliary magnet come into surface contact, there is no gap between the rotor core (claw-shaped magnetic pole) and the auxiliary magnet, and it may be difficult to interpose a cushioning material. There is.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a Randell type rotor and a Randel type motor capable of easily interposing a cushioning material between a rotor core and an auxiliary magnet. There is.

The Randell type rotor that solves the above problems has a plurality of claw-shaped magnetic poles in the circumferential direction, and the first and second rotor cores that are assembled in such a manner that the claw-shaped magnetic poles alternate in the circumferential direction, and the first And, by being arranged between the axial directions of the second rotor core and magnetized in the axial direction, the claw-shaped magnetic pole of the first rotor core functions as the first magnetic pole, and the claw-shaped magnetic pole of the second rotor core is made to function. A field magnet that functions as a second magnetic pole and an annular auxiliary magnet that is arranged so as to pass between the field magnet and each of the claw-shaped magnetic poles in the radial direction are provided, and the auxiliary magnet is bonded. It is a magnet, and the auxiliary magnet is integrally formed with a protrusion protruding outward in the circumferential direction on a circumferential end face facing the claw-shaped magnetic pole in the circumferential direction, and the protrusion has a curved shape when viewed from the axial direction. The tip of the protrusion is in contact with the circumferential end surface of the claw-shaped magnetic pole facing the tip of the protrusion in the circumferential direction, and the protrusion is provided between the auxiliary magnet and the claw-shaped magnetic pole in the circumferential direction. At no radial position, a cushioning material is provided in the gap between the auxiliary magnet and the claw-shaped magnetic pole generated by the protrusion, and the cushioning material comes into contact with the circumferential end face of the auxiliary magnet facing one side in the circumferential direction. At the same time, it is in contact with the circumferential end face of the claw-shaped magnetic pole facing the other side in the circumferential direction.

According to this configuration, auxiliary to the magnet, the claw-shaped magnetic poles in the circumferential direction because direction is formed in the circumferential end faces of Oite opposing protrusions protruding circumferentially outwardly integrally, the auxiliary magnet and the claw-shaped magnetic poles by the projection A gap can be provided to the extent that a cushioning material can be interposed between the two. As a result, a cushioning material can be easily interposed between the rotor core and the auxiliary magnet.

According to the configuration of this, it is possible to interpose a buffer material in the gap between the auxiliary magnets and the claw-shaped magnetic poles by providing a projection on the auxiliary magnet.

Further, the Randell type motor that solves the above-mentioned problems includes the above-mentioned Randell type rotor.
According to this configuration, the above effect can be obtained in the Randell type motor.

According to the Randell type rotor and the Randel type motor of the present invention, a cushioning material can be easily interposed between the rotor core and the auxiliary magnet.

A front view of the brushless motor of one embodiment as viewed from the axial direction. Side view of the brushless motor of the same form. Sectional drawing of the brushless motor of the same form. An exploded perspective view of a brushless motor of the same form. An exploded perspective view of the rotor and sensor magnet of the same shape disassembled. An exploded perspective view of a rotor of the same form. The plan view which shows a part of the rotor of the same form.

Hereinafter, an embodiment of the Randell type motor will be described.
As shown in FIGS. 1 to 3, the brushless motor M of the present embodiment is a Randell type motor, for example, a motor used for a valve timing variable device connected to an engine of a vehicle.

The brushless motor M has a motor case 1. The motor case 1 has a tubular yoke 2, a base member 3, and a cover member 4. The tubular yoke 2 has a bottomed tubular shape, and the base member 3 is attached to the opening side thereof. The base member 3 is made of aluminum and is attached to the opening side of the tubular yoke 2. The cover member 4 has a substantially plate shape, and is attached to the side of the base member 3 opposite to the tubular yoke 2. The circuit board 5 is accommodated in the accommodating space composed of the base member 3 and the cover member 4.

In the brushless motor M, a stator 10 is fixed to the inner peripheral surface of the tubular yoke 2, and a rotor 20 having a rotating shaft 6 is arranged inside the stator 10. The rotating shaft 6 is a non-magnetic stainless steel shaft, and is housed and fixed in the bearing 7 formed in the bearing holding portion 2a formed in the tubular yoke 2 and in the bearing holding portion 3a formed in the base member 3. The bearing 8 is rotatably supported by the motor case 1. The bearing 8 is made of a non-magnetic material.

The tip of the rotating shaft 6 projects from the tubular yoke 2 to which the joint member 9 is attached. The joint member 9 is connected to the adjusting mechanism in order to transmit the rotational torque output from the motor M to the adjusting mechanism (not shown). The adjustment mechanism is connected to a camshaft (not shown) that opens and closes an engine valve (not shown). That is, the timing at which the adjusting mechanism operated by the rotational torque output from the motor M operates the camshaft to open and close the engine valve is adjusted.

[Stator]
As shown in FIGS. 3 and 4, the stator 10 is fixed to the inner peripheral surface of the tubular yoke 2. The stator 10 has a cylindrical stator core 11, and a plurality of teeth 12 arranged at equal pitches in the circumferential direction are formed on the stator core 11 so as to extend inward in the radial direction. Each tooth 12 is a T-shaped tooth, and its radial inner peripheral surface is an arc surface extending in the axial direction from a concentric arc centered on the central axis L of the rotating shaft 6.

Each of the three-phase windings is wound around each tooth 12 via an insulator 13. Specifically, as shown in FIG. 4, the twelve teeth 12 have three-phase windings in the circumferential direction, that is, U-phase windings 14, V-phase windings 15, and W-phase windings 16 in this order, for example. It is wound in a concentrated winding. Then, a three-phase driving current is supplied to these wound windings 14, 15 and 16, to form a rotating magnetic field in the stator 10, and the rotor 20 arranged inside the stator 10 rotates forward and reverse around the center of the rotating shaft 6. It is designed to let you.

[Rotor]
As shown in FIGS. 3 to 6, the rotor 20 has the rotating shaft 6, the first and second rotor cores 21 and 31, a field magnet 40, a rectifying magnet 42, and a sensor magnet 50. There is.

[1st rotor core]
As shown in FIGS. 3 to 6, the first rotor core 21 is formed of an electromagnetic steel plate made of a soft magnetic material and is arranged on the base member 3 side. The first rotor core 21 has a substantially disk-shaped first core base 22, and a through hole 22a penetrating in the axial direction is formed at the center position thereof. A substantially cylindrical boss portion 22b is formed so as to protrude from the outer peripheral portion of the through hole 22a on the base member 3 side. In the present embodiment, the through hole 22a and the boss portion 22b are formed at the same time by burring. The outer diameter of the boss portion 22b is formed to be shorter than the outer diameter of the bearing 8 that rotatably supports one side of the rotating shaft 6. That is, the outer diameter of the boss portion 22b is formed to be shorter than the inner diameter of the bearing holding portion 3a for accommodating and fixing the bearing 8 provided on the base member 3.

The rotating shaft 6 is press-fitted into the through hole 22a (boss portion 22b) and inserted into the through hole 22a, and the first core base 22 is crimped and fixed to the rotating shaft 6. At this time, by forming the boss portion 22b, the first core base 22 is firmly crimped and fixed to the rotating shaft 6. Then, when the first core base 22 is crimp-fixed to the rotating shaft 6, the boss portion 22b is arranged so as to be separated from the bearing 8 housed and fixed in the bearing holding portion 3a in the axial direction. (See FIG. 1).

On the outer peripheral surface 22c of the first core base 22, a plurality of (four in the present embodiment) first claw-shaped magnetic poles 23 are formed at equal intervals so as to project outward in the radial direction and extend in the axial direction. Here, in the first claw-shaped magnetic pole 23, a portion protruding outward in the radial direction from the outer peripheral surface 22c of the first core base 22 is referred to as a first base portion 24, and a tip portion bent in the axial direction is referred to as a first magnetic pole portion 25. That is.

Circumferential end surfaces 23a and 23b of the first claw-shaped magnetic pole 23 composed of the first base portion 24 and the first magnetic pole portion 25 are flat surfaces extending in the radial direction (not inclined with respect to the radial direction when viewed from the axial direction). It has become. The circumferential angle of each of the first claw-shaped magnetic poles 23, that is, the angle between the peripheral end surfaces 23a and 23b is set to be smaller than the angle of the gap between the first claw-shaped magnetic poles 23 adjacent to each other in the circumferential direction. There is.

Further, the radial outer surface 26 of the first magnetic pole portion 25 has an arcuate surface having a concentric circular arc surface whose cross-sectional shape in the axial direction is centered on the central axis L of the rotating shaft 6, and two radial outer surfaces 26 thereof. It has an auxiliary groove 27. The auxiliary groove 27 is formed at a position deviated from the circumferential center of the radial outer surface 26 by the same angle on both sides. The auxiliary groove 27 has a U-shaped cross section in the direction orthogonal to the axis, that is, the bottom surface is formed with a curved surface.

[Second rotor core]
As shown in FIGS. 3 to 6, the second rotor core 31 has the same material and shape as the first rotor core 21, and is arranged on the tubular yoke 2 side. The second rotor core 31 has a disk-shaped second core base 32, and a through hole 32a penetrating in the axial direction is formed at the center position thereof. A substantially cylindrical boss portion 32b is formed so as to protrude from the outer peripheral portion of the through hole 32a on the tubular yoke 2 side. In the present embodiment, the through hole 32a and the boss portion 32b are formed at the same time by burring. The outer diameter of the boss portion 32b is formed to be shorter than the outer diameter of the bearing 7 that rotatably supports one side of the rotating shaft 6. That is, the outer diameter of the boss portion 32b is formed to be shorter than the inner diameter of the bearing holding portion 2a that accommodates and fixes the bearing 7 provided in the tubular yoke 2.

The rotating shaft 6 is press-fitted into the through hole 32a (boss portion 32b) and inserted into the through hole 32a, and the second core base 32 is crimped and fixed to the rotating shaft 6. At this time, by forming the boss portion 32b, the second core base 32 is firmly crimped and fixed to the rotating shaft 6. Then, when the second core base 32 is crimp-fixed to the rotating shaft 6, the boss portion 32b is arranged so as to be separated from the bearing 7 housed and fixed in the bearing holding portion 2a in the axial direction. (See Fig. 1).

On the outer peripheral surface 32c of the second core base 32, a plurality of (four in the present embodiment) second claw-shaped magnetic poles 33 are formed at equal intervals so as to project outward in the radial direction and extend in the axial direction. Here, in the second claw-shaped magnetic pole 33, a portion protruding outward in the radial direction from the outer peripheral surface 32c of the second core base 32 is referred to as a second base portion 34, and a tip portion bent in the axial direction is referred to as a second magnetic pole portion 35. That is.

Both end surfaces 33a and 33b in the circumferential direction of the second claw-shaped magnetic pole 33 composed of the second base portion 34 and the second magnetic pole portion 35 are flat surfaces extending in the radial direction. The circumferential angle of each of the second claw-shaped magnetic poles 33, that is, the angle between the peripheral end surfaces 33a and 33b is set to be smaller than the angle of the gap between the second claw-shaped magnetic poles 33 adjacent to each other in the circumferential direction. There is.

Further, the radial outer surface 36 of the second magnetic pole portion 35 has a concentric arc surface whose cross-sectional shape in the axial direction is centered on the central axis L of the rotating shaft 6, and two radial outer surfaces 36 thereof. It has an auxiliary groove 37. The auxiliary groove 37 is formed at a position deviated from the circumferential center of the radial outer surface 36 by the same angle on both sides. The auxiliary groove 37 has a U-shaped cross section in the direction orthogonal to the axis, that is, the bottom surface is formed with a curved surface.

Then, such a second rotor core 31 is combined so as to face the first rotor core 21 so that each of the second claw-shaped magnetic poles 33 is between the first claw-shaped magnetic poles 23 of the first rotor core 21. At this time, the field magnet 40 is interposed between the inner side surface 32d of the second core base 32 and the inner side surface 22d of the first core base 22 in the axial direction.

[Field magnet]
As shown in FIG. 6, the field magnet 40 is a disk-shaped permanent magnet, and a through hole 40a is formed in the central portion thereof. The field magnet 40 has a cylindrical sleeve 41 inserted into the through hole 40a. The sleeve 41 is made of a non-magnetic material and is made of the same stainless steel as the rotating shaft 6 in the present embodiment. The outer diameter of the field magnet 40 is set to match the outer diameters of the first and second core bases 22 and 32. Therefore, the outer peripheral surface 40b of the field magnet 40 is flush with the outer peripheral surfaces 22c and 32c of the first and second core bases 22 and 32.

The field magnet 40 is a disk-shaped permanent magnet, and a through hole 40a is formed in the central portion thereof. The field magnet 40 has a cylindrical sleeve 41 inserted into the through hole 40a. The sleeve 41 is made of a non-magnetic material and is made of the same stainless steel as the rotating shaft 6 in the present embodiment. The outer diameter of the field magnet 40 is set to match the outer diameters of the first and second core bases 22 and 32. Therefore, the outer peripheral surface 40b of the field magnet 40 is flush with the outer peripheral surfaces 22c and 32c of the first and second core bases 22 and 32.

Therefore, the rotor 20 of the present embodiment is a so-called Randell type rotor using the field magnet 40. In the rotor 20, the first claw-shaped magnetic pole 23 as the north pole and the second claw-shaped magnetic pole 33 as the S pole are alternately arranged in the circumferential direction, and the number of magnetic poles is eight. That is, in the brushless motor M of the present embodiment, the number of poles of the rotor 20 is set to 2 × n (where n is a natural number), and the number of teeth 12 of the stator 10 is set to 3 × n. The number of poles of the rotor 20 is set to "8", and the number of teeth 12 of the stator 10 is set to "12".

[Rectifying magnet (auxiliary magnet)]
The rotor 20 includes a rectifying magnet 42 as an auxiliary magnet on the outer peripheral side of the field magnet 40. The rectifying magnet 42 is formed so as to form an annular shape. The field magnet 40 and the rectifying magnet 42 are made of different materials. Specifically, the field magnet 40 is, for example, an anisotropic sintered magnet, and is composed of, for example, a ferrite magnet, a samarium-cobalt (SmCo) magnet, a neodymium magnet, or the like. The rectifying magnet 42 is, for example, a bond magnet (plastic magnet, rubber magnet, etc.), and is composed of a rare earth magnet such as a samarium iron nitrogen (SmFeN) magnet, a samarium cobalt (SmCo) magnet, a neodymium magnet, or the like.

As shown in FIG. 6, the rectifying magnet 42 has a back magnet portion 43, 44 and an interpole magnet portion 45, and each of the back magnet portion 43, 44 and the interpole magnet portion 45 suppresses leakage flux. It is a magnetized polar anisotropic magnet.

More specifically, one back magnet portion 43 is arranged between the inner peripheral surface of the first magnetic pole portion 25 of the first claw-shaped magnetic pole 23 and the outer peripheral surface 32c of the second core base 32. The back magnet portion 43 has an N pole on the side close to the inner peripheral surface of the first magnetic pole portion 25, which is the same pole as the first magnetic pole portion 25, and a side close to the outer peripheral surface 32c of the second core base 32. The radial component is mainly magnetized so as to have an S pole having the same pole as the 2-core base 32.

The other back magnet portion 44 is arranged between the inner peripheral surface of the second magnetic pole portion 35 of the second claw-shaped magnetic pole 33 and the outer peripheral surface 22c of the first core base 22. The back magnet portion 44 has an S pole on the side close to the inner peripheral surface of the second magnetic pole portion 35, which is the same pole as the second magnetic pole portion 35, and a side close to the outer peripheral surface 22c of the first core base 22. The radial component is mainly magnetized so as to be the north pole of the same pole as the one core base 22.

The interpole magnet portion 45 is arranged between the first claw-shaped magnetic pole 23 and the second claw-shaped magnetic pole 33 in the circumferential direction. The polar magnet portion 45 is mainly magnetized with a circumferential component so that the first claw-shaped magnetic pole 23 side becomes the N pole and the second claw-shaped magnetic pole 33 side becomes the S pole in the circumferential direction.

[Sensor magnet]
The sensor magnet 50 has a substantially rectangular cross section and an annular shape, but the central portion in the radial direction serves as a fixing surface 51 for fixing to the fixing portion A1 on the main body side of the rotor 20 on one end surface in the axial direction. ing. The fixed surface 51 is an annular flat surface provided over the entire circumference of the sensor magnet 50.

On the other hand, as the fixing portion A1 on the main body side of the rotor 20 for fixing the sensor magnet 50, an annular surface straddling the first rotor core 21 and the rectifying magnet 42, specifically, the first core base 22 first. An annular flatness formed by the end face of the first base portion 24 of the one-claw magnetic pole 23, the end face of the back magnet portion 44 of the rectifying magnet 42, and a part of the end face of the interpole magnet portion 45 in the circumferential direction. It is a face.

Then, the sensor magnet 50 is pressure-bonded and fixed to the fixing portion A1 with an adhesive applied between the fixing surface 51 and the fixing portion A1 on the main body side of the rotor 20. In this way, the sensor magnet 50 is adhesively fixed so that its own magnetic pole and the magnetic pole of the rotor 20, that is, the first and second claw-shaped magnetic poles 23 and 33 correspond to each other.

[Magnetic sensor]
Further, in the brushless motor M of the present embodiment, a magnetic sensor 60 such as a Hall IC is provided on the circuit board 5 so as to face the sensor magnet 50 at a predetermined interval in the axial direction. Then, when the sensor magnet 50 rotates integrally with the rotor 20, the magnetic sensor 60 outputs a detection signal corresponding to the magnetic poles of the sensor magnet 50. The control circuit (not shown) that receives the detection signal from the magnetic sensor 60 calculates the rotation position (angle) of the rotor 20 and the rotation speed (speed) based on the detection signal, and calculates the rotation speed (speed) of the brushless motor M. Drive control is performed.

Next, a characteristic portion of the rotor 20 configured as the Randell type rotor of the present embodiment will be described.
As shown in FIG. 7, the interpole magnet portion 45 of the rectifying magnet 42 of the present embodiment has a claw-shaped magnetic pole 23 of the first rotor core 21 in a state where the rectifying magnet 42 is assembled with the first rotor core 21 and the second rotor core 31. A protrusion 45b projecting outward in the circumferential direction is provided on the peripheral end surface 45a facing the circumferential direction. More specifically, the protrusion 45b is radially inside the magnetic pole portion 25 and from the radial center position of the interpole magnet portion 45 in a state where the rectifying magnet 42 is assembled with the first rotor core 21 and the second rotor core 31. Is integrally formed with the rectifying magnet 42 (interpole magnet portion 45) at a position on the outer side in the radial direction. Although not shown, the pole-to-pole magnet portion 45 has a circumferential end face facing the claw-shaped magnetic pole 33 of the second rotor core 31 in the circumferential direction in a state where the rectifying magnet 42 is assembled with the first rotor core 21 and the second rotor core 31. The 45c is provided with a protrusion similar to the protrusion 45b that protrudes outward in the circumferential direction.

Further, a cushioning material 70 is provided between the polar magnet portion 45 and the rotor cores 21 and 31 in the circumferential direction and between the back magnet portions 43 and 44 and the rotor cores 21 and 31 in the radial direction. The cushioning material 70 is, for example, an adhesive, and is injected into the gap in a state where the rectifying magnet 42 and the rotor cores 21 and 31 are assembled.

Here, as described above, in the rotor 20 of the present embodiment, since the protrusion 45b is provided on the circumferential end surface 45a of the interpole magnet portion 45, at least when the rectifying magnet 42 and the rotor cores 21 and 31 are assembled, at least. A gap will be created by the amount of protrusion of the protrusion 45b. As a result, the adhesive material which is the cushioning material 70 can be poured from between the rectifying magnet 42 and the interpole magnet portion 45, and the cushioning material can be easily interposed between the rotor core and the auxiliary magnet. It has become.

Next, the effect of this embodiment will be described.
(1) Since the rectifying magnet 42 is provided with a protrusion 45b protruding outward in the circumferential direction between the rectifying magnet 42 and the claw-shaped magnetic poles 23, 33, the protrusion 45b causes the rectifying magnet 42 and the claw-shaped magnetic poles 23, 33 to be formed. A gap can be provided so that the cushioning material 70 can be interposed between the circumferential directions of the magnets. As a result, the cushioning material 70 can be easily interposed between the rotor cores 21 and 31 and the rectifying magnet 42.

(2) By providing the protrusion 45b only on the rectifying magnet 42, the cushioning material 70 can be interposed in the gap between the rectifying magnet 42 and the claw-shaped magnetic poles 23 and 33.
(3) Since the rectifying magnet 42 is composed of a relatively soft bond magnet, the rectifying magnet 42 (projection 45b) is relatively soft even when the stress due to the protrusion 45b acts on the rotor cores 21 and 31, which is excessive. Wear can be suppressed.

The above embodiment may be changed as follows.
-In the above embodiment, the position of the protrusion 45b may be changed as appropriate.
For example, the protrusion 45b may be formed at a position where the claw-shaped magnetic poles 23 and 33 come into contact with the magnetic pole portions 25 and 35.

Further, the protrusion 45b may be formed on the rotor cores 21 and 31 side, or the protrusion 45b may be formed on both the rotor cores 21 and 31 and the rectifying magnet 42.
-In the above embodiment, an adhesive is used as the cushioning material 70, but the present invention is not limited to this, and a cushioning material that does not involve adhesion may be used.

-In the above embodiment, the protrusion 45b and the rectifying magnet 42 are integrally formed in advance, but the protrusion 45b and the rectifying magnet 42 may be integrally formed by post-processing.
-The above embodiment and each modification may be combined as appropriate.

Next, the technical idea that can be grasped from the above embodiment and another example will be added below.
(Appendix 1)
In the Randell type rotor according to claim 2,
The Randell type rotor is characterized in that the auxiliary magnet is a bond magnet.

According to this configuration, by configuring the auxiliary magnet provided with the protrusion with a bond magnet, the auxiliary magnet (protrusion) is relatively soft even when the stress due to the protrusion acts on the rotor core side, so that excessive wear is caused. It can be suppressed.

M ... Brushless motor (Randel type motor), 20 ... Rotor (Randel type rotor), 21 ... 1st rotor core, 23 ... 1st claw-shaped magnetic pole (claw-shaped magnetic pole), 31 ... 2nd rotor core, 33 ... 2nd claw-shaped Magnetic poles (claw-shaped magnetic poles), 40 ... field magnets, 42 ... rectifying magnets (auxiliary magnets), 43, 44 ... back magnets constituting the rectifying magnets, 45 ... pole magnets constituting the rectifying magnets, 45a ... circumference Directional end face, 45b ... Projection, 45c ... Circumferential end face, 70 ... Buffer material.

Claims (2)

A first and second rotor core having a plurality of claw-shaped magnetic poles in the circumferential direction and being assembled in such a manner that the claw-shaped magnetic poles alternate in the circumferential direction.
By being arranged between the axial directions of the first and second rotor cores and being magnetized in the axial direction, the claw-shaped magnetic pole of the first rotor core functions as a first magnetic pole, and the claw of the second rotor core. A field magnet that makes the shaped magnetic pole function as a second magnetic pole,
An annular auxiliary magnet arranged so as to pass between the field magnet and each of the claw-shaped magnetic poles in the radial direction,
With
The auxiliary magnet is a bond magnet.
The auxiliary magnet is integrally formed with a protrusion that protrudes outward in the circumferential direction on a circumferential end face that faces the claw-shaped magnetic pole in the circumferential direction, and the protrusion has a curved shape when viewed from the axial direction, and the tip of the protrusion. Is in contact with the circumferential end face of the claw-shaped magnetic pole facing the tip of the protrusion in the circumferential direction.
At a radial position where the protrusion is not provided between the auxiliary magnet and the claw-shaped magnetic pole, a cushioning material is provided in the gap between the auxiliary magnet and the claw-shaped magnetic pole generated by the protrusion, and the cushioning material is provided. The material is in contact with the circumferential end face of the auxiliary magnet facing one side in the circumferential direction and also in contact with the circumferential end face of the claw-shaped magnetic pole facing the other side in the circumferential direction. Mold rotor. A Randell-type motor including the Randell-type rotor according to claim 1.

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