JP6460159B2 - Rotor and motor - Google Patents

Description

  The present invention relates to a rotor and a motor.

  The rotor used in the motor has a rotor core that has a plurality of claw-shaped magnetic poles in the circumferential direction and is combined, and field magnets are arranged between them to function each claw-shaped magnetic pole as a different magnetic pole alternately There is a so-called permanent magnet field rundel-type rotor (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 5-43749

By the way, in the motor as described above, if a gap is formed on the back surface of the claw-shaped magnetic pole, the magnetic flux may leak from the gap.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a rotor and a motor capable of realizing a structure in which leakage magnetic flux is suppressed.

A rotor that solves the above-described problem is a first disk in which a plurality of first claw-shaped magnetic poles protrude radially outward and extend in the axial direction at equal intervals on the outer periphery of a substantially disk-shaped first core base. A plurality of second claw-shaped magnetic poles project radially outward and extend in the axial direction on the outer periphery of the rotor core and the substantially disc-shaped second core base, and extend in the axial direction. Are arranged between the first rotor core disposed between the first claw-shaped magnetic poles of the corresponding first rotor core and the axial direction between the first core base and the second core base, and are magnetized in the axial direction. Thus, a field magnet that causes the first claw-shaped magnetic pole to function as the first magnetic pole and the second claw-shaped magnetic pole to function as the second magnetic pole is disposed on the back surface of the first claw-shaped magnetic pole. And a second back surface disposed on the back surface of the second claw-shaped magnetic pole. A polar anisotropic magnet having a stone portion and surrounding an outer periphery of the field magnet, wherein the polar anisotropic magnet is adjacent to the second back magnet portion from the first back magnet portion. Until the field magnet side is curved, and the inner peripheral surface of the polar anisotropic magnet is the outer peripheral surface of the first core base and the second core base. It is in contact with the outer peripheral surface of .
A rotor that solves the above-described problem is a first disk in which a plurality of first claw-shaped magnetic poles protrude radially outward and extend in the axial direction at equal intervals on the outer periphery of a substantially disk-shaped first core base. A plurality of second claw-shaped magnetic poles project radially outward and extend in the axial direction on the outer periphery of the rotor core and the substantially disc-shaped second core base, and extend in the axial direction. Are arranged between the first rotor core disposed between the first claw-shaped magnetic poles of the corresponding first rotor core and the axial direction between the first core base and the second core base, and are magnetized in the axial direction. Thus, a field magnet that causes the first claw-shaped magnetic pole to function as the first magnetic pole and the second claw-shaped magnetic pole to function as the second magnetic pole is disposed on the back surface of the first claw-shaped magnetic pole. And a second back surface disposed on the back surface of the second claw-shaped magnetic pole. A polar anisotropic magnet having a stone portion and surrounding an outer periphery of the field magnet, wherein the polar anisotropic magnet is adjacent to the second back magnet portion from the first back magnet portion. Until the field magnet side is bent, and the inner circumferential surface of the polar anisotropic magnet is in contact with the outer circumferential surface of the field magnet.

In the above-described rotor, the polar anisotropic magnet includes an inter-pole magnet portion disposed between the first claw-shaped magnetic pole and the second claw-shaped magnetic pole in the circumferential direction.
In the rotor described above, the interpole magnet portion extends radially outward from the first back magnet portion and the second back magnet portion.

In the rotor described above, the first back magnet part and the second back magnet part are arranged so as to be shifted from each other in the axial direction.
In the rotor described above, the first claw-shaped magnetic pole and the first back magnet part, and the second claw-shaped magnetic pole and the second back magnet part are alternately arranged in the circumferential direction.

In the rotor described above, the polar anisotropic magnet is integrally formed in an annular shape.
A motor that solves the above problem includes the rotor described above.

  Therefore, according to the above-described invention, it is possible to provide a rotor and a motor that can realize a structure in which leakage magnetic flux is suppressed.

Sectional drawing of the motor in embodiment. The perspective view of the rotor in the same as the above. Sectional drawing of the rotor in the same as the above. The perspective view of the auxiliary magnet in the same as the above. The perspective view of the auxiliary magnet in 2nd Embodiment. The perspective view of the circumferential direction division part which comprises the auxiliary magnet in the same as the above. The perspective view of the auxiliary magnet in another example. The perspective view of the circumferential direction division part which comprises the auxiliary magnet in the same as the above. The perspective view of the auxiliary magnet in another example. The perspective view of the auxiliary magnet in another example. The top view of the auxiliary magnet in 3rd Embodiment. The top view of the auxiliary magnet in another example. The top view of the auxiliary magnet in another example. The top view of the auxiliary magnet in another example. (A) is a top view of the auxiliary magnet in another example, (b) is a perspective view of the auxiliary magnet in another example. The perspective view of the auxiliary magnet in 4th Embodiment. The perspective view of the auxiliary magnet in another example.

(First embodiment)
A first embodiment of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a motor case 2 of a motor 1 closes a cylindrical housing 3 formed in a bottomed cylindrical shape and an opening on the front side (left side in FIG. 1) of the cylindrical housing 3. And a front end plate 4. A circuit housing box 5 that houses a power supply circuit such as a circuit board is attached to an end of the cylindrical housing 3 on the rear side (right side in FIG. 1). A stator 6 is fixed to the inner peripheral surface of the cylindrical housing 3. The stator 6 includes an armature core 7 having a plurality of teeth extending radially inward, and a segment conductor (SC) winding 8 wound around the teeth of the armature core 7. The rotor 11 of the motor 1 has a rotating shaft 12 and is disposed inside the stator 6. The rotating shaft 12 is a non-magnetic metal shaft, and is rotatably supported by bearings 13 and 14 supported by the bottom 3 a of the cylindrical housing 3 and the front end plate 4.

  As shown in FIGS. 2 and 3, the rotor 11 includes first and second rotor cores 21 and 22, an annular magnet 23 (see FIG. 4), and an auxiliary magnet 24. 3 and 4 indicate the magnetization directions of the magnets 23 and 24 (from the S pole to the N pole).

  As shown in FIGS. 2 and 3, the first rotor core 21 has a plurality of (five in the present embodiment) first claw-shaped magnetic poles 21 b at equal intervals on the outer periphery of the substantially disk-shaped first core base 21 a. It protrudes radially outward and extends in the axial direction. The circumferential end surfaces 21c and 21d of the first claw-shaped magnetic pole 21b are flat surfaces extending in the radial direction (not inclined with respect to the radial direction when viewed from the axial direction), and the first claw-shaped magnetic pole 21b has a cross section perpendicular to the axis. Has a fan shape. The circumferential angle of each first claw-shaped magnetic pole 21b, that is, the angle between the circumferential end faces 21c and 21d is set smaller than the angle of the gap between the first claw-shaped magnetic poles 21b adjacent in the circumferential direction.

  As shown in FIGS. 2 and 3, the second rotor core 22 has the same shape as the first rotor core 21, and has a plurality of second claw-like shapes on the outer periphery of the substantially disk-shaped second core base 22a at equal intervals. The magnetic pole 22b protrudes radially outward and extends in the axial direction. The circumferential end surfaces 22c and 22d of the second claw-shaped magnetic pole 22b are flat surfaces extending in the radial direction, and the second claw-shaped magnetic pole 22b has a fan-shaped cross section in the direction perpendicular to the axis. The circumferential angle of each second claw-shaped magnetic pole 22b, that is, the angle between the circumferential end faces 22c and 22d is set smaller than the angle of the gap between the second claw-shaped magnetic poles 22b adjacent in the circumferential direction. The second rotor core 22 is arranged between the first core base 21a and the second core base 22a such that the second claw-shaped magnetic poles 22b are disposed between the corresponding first claw-shaped magnetic poles 21b. The annular magnet 23 (see FIG. 4) is arranged (clamped) between the directions, and is assembled to the first rotor core 21. At this time, since one circumferential end face 21c of the first claw-shaped magnetic pole 21b and the other circumferential end face 22d of the second claw-shaped magnetic pole 22b are formed in parallel along the axial direction, each end face 21c is formed. , 22d is formed so as to be substantially linear along the axial direction. Further, since the other circumferential end face 21d of the first claw-shaped magnetic pole 21b and one circumferential end face 22c of the second claw-shaped magnetic pole 22b are formed so as to be parallel along the axial direction, each end face 21d, The gap between 22c is formed so as to be substantially linear along the axial direction.

  As shown in FIG. 3, the outer diameter of the annular magnet 23 is set to be the same as the outer diameter of the first and second core bases 21a and 22a, and the first claw-shaped magnetic pole 21b is used as the first magnetic pole (this embodiment). The second claw-shaped magnetic pole 22b is magnetized in the axial direction so as to function as a second magnetic pole (S pole in the present embodiment). Therefore, the rotor 11 of the present embodiment is a so-called Landel type rotor using the annular magnet 23 as a field magnet. In the rotor 11, first claw-shaped magnetic poles 21b that are N poles and second claw-shaped magnetic poles 22b that are S poles are alternately arranged in the circumferential direction, and the number of magnetic poles is 10 poles (the number of pole pairs is 5). It becomes. Here, since the number of pole pairs is an odd number of 3 or more, the claw-like magnetic poles having the same polarity do not face each other at 180 ° in the circumferential direction when viewed in the rotor core unit, so that the shape is stable against magnetic vibration.

  As shown in FIG. 4, the auxiliary magnet 24 includes a plurality of circumferentially divided portions 25 and 26 that are divided in the circumferential direction, and the circumferentially divided portions 25 and 26 are continuously adjacent to each other in the circumferential direction. The The circumferential division portions 25 and 26 include a first circumferential division portion 25 attached to the first claw-shaped magnetic pole 21b and a second circumferential division portion 26 attached to the second claw-shaped magnetic pole 22b. .

  As shown in FIG. 4, the first circumferential dividing portion 25 attached to each first claw-shaped magnetic pole 21 b is formed to have a U-shape when viewed in the axial direction, and the first back magnet portion 25 a And a one-pole magnet portion 25b.

  As shown in FIGS. 2 to 4, the first back magnet portion 25a is disposed between the back surface 21e (radially inner surface) of the first claw-shaped magnetic pole 21b and the outer peripheral surface 22f of the second core base 22a. ing. The first back magnet portion 25a has a fan-shaped cross section in the direction perpendicular to the axis, and the second core base has a side that abuts on the back surface 21e of the first claw-shaped magnetic pole 21b with the N pole having the same polarity as the first claw-shaped magnetic pole 21b. Magnetization is performed so that the side of 22a that comes into contact with the outer peripheral surface 22f becomes the S pole having the same polarity as the second core base 22a. Moreover, the 1st back magnet part 25a can be comprised with a ferrite magnet, for example.

  As shown in FIGS. 2 and 4, the first inter-pole magnet portion 25b extends radially outward from both circumferential sides of the first back magnet portion 25a and both circumferential sides of the first claw-shaped magnetic pole 21b. The first back magnet part 25a is formed integrally with the first back magnet part 25a. Further, the first inter-pole magnet portions 25b on both sides in the circumferential direction of the first claw-shaped magnetic pole 21b have a circumferential thickness that is half the gap between the first claw-shaped magnetic pole 21b and the second claw-shaped magnetic pole 22b in the circumferential direction ( Length).

  Moreover, the 2nd circumferential direction division | segmentation part 26 attached to each 2nd nail | claw-shaped magnetic pole 22b is axial direction similarly to the 1st circumferential direction division | segmentation part 25 by the side of the said 1st nail | claw-shaped magnetic pole 21b, as shown in FIG. It is formed to have a U-shape when viewed, and includes a second back magnet part 26a and a second inter-pole magnet part 26b.

  As shown in FIGS. 2 to 4, the second back magnet part 26 a is disposed between the back surface 22 e (the radially inner surface) of the second claw-shaped magnetic pole 22 b and the outer peripheral surface 21 f of the first core base 21 a. ing. The second back magnet part 26a has a fan-shaped cross section in the direction perpendicular to the axis, the side contacting the back surface 22e of the second claw-shaped magnetic pole 22b is the S pole, and the side contacting the outer peripheral surface 21f of the first core base 21a is N Magnetized to be poles. Moreover, the 2nd back magnet part 26a can be comprised with a ferrite magnet, for example like the 1st back magnet part 25a.

  Here, the first back magnet portion 25a and the second back magnet portion 26a are arranged so as to overlap each other in the axial direction at the axial position of the rotor 11 where the annular magnet 23 is arranged, in other words, from both sides of the rotor 11. The axial length is set so that the magnet 23 is disposed until reaching the axial position where the magnet 23 is disposed.

  The second interpole magnet portion 26b has substantially the same shape as the first interpole magnet portion 25b, and extends radially outward from both circumferential sides of the second back magnet portion 26a. The second back magnet part 26a is integrally formed so as to be located on both sides in the circumferential direction of the magnetic pole 22b. Further, the second inter-pole magnet portions 26b on both sides in the circumferential direction of the second claw-shaped magnetic pole 22b have a circumferential thickness (half the gap between the first claw-shaped magnetic pole 21b and the second claw-shaped magnetic pole 22b in the circumferential direction ( Length). That is, the interpole magnet between the first claw-shaped magnetic pole 21 b and the second claw-shaped magnetic pole 22 b is the first interpolar magnet portion 25 b of the first circumferential direction division portion 25 and the second of the second circumferential direction division portion 26. The two are formed together with the interpolar magnet portion 26b. As shown in FIG. 3, the interpolar magnet portions 25 b and 26 b of the circumferentially divided portions 25 and 26 are arranged at substantially the center position in the circumferential direction between the first claw-shaped magnetic pole 21 b and the second claw-shaped magnetic pole 22 b. Are arranged in an annular form in contact with each other in the circumferential direction.

  When the three-phase drive current is supplied to the segment conductor (SC) winding 8 via the power supply circuit in the circuit housing box 5, the motor 1 configured as described above rotates the rotor 11 with the stator 6. Is generated, and the rotor 11 is rotationally driven.

Next, the operation of the motor 1 configured as described above will be described.
The rotor 11 of the motor 1 of the present embodiment is disposed on the back surfaces of the interpolar magnet portions 25b and 26b disposed between the claw-shaped magnetic poles 21b and 22b and the first and second claw-shaped magnetic poles 21b and 22b. Auxiliary magnet 24 having circumferentially divided portions 25 and 26 formed integrally with rear magnet portions 25a and 26a. Thus, by providing the auxiliary magnet 24 composed of the inter-pole magnet portions 25b and 26b and the back magnet portions 25a and 26a, it is possible to suppress the leakage magnetic flux from the air gap and contribute to higher output of the rotor. Yes. Further, the circumferentially divided portions 25 and 26 of the auxiliary magnet 24 are configured such that the interpolar magnet portions 25b and 26b and the back magnet portions 25a and 26a are integrally formed, so that the number of parts can be suppressed. .

Next, characteristic effects of the present embodiment will be described.
(1) The interpolar magnet portions 25b and 26b disposed between the first and second claw-shaped magnetic poles 21b and 22b and the back surfaces of the first and second claw-shaped magnetic poles 21b and 22b. The back magnet portions 25a and 26a are integrally formed and provided with auxiliary magnets 24 that come into contact with the claw-shaped magnetic poles 21b and 22b in the radial direction and the circumferential direction. Thus, by providing the auxiliary magnet 24 formed integrally with the inter-pole magnet portions 25b and 26b and the back magnet portions 25a and 26a, the leakage magnetic flux can be suppressed while suppressing the number of parts.

  (2) The auxiliary magnet 24 has the same magnetization direction as the claw-shaped magnetic poles 21b and 22b functioning as the first and second magnetic poles by the annular magnet 23 as a field magnet. Thereby, the magnetic flux of the outer surfaces of the claw-shaped magnetic poles 21b and 22b can be increased.

  (3) The auxiliary magnet 24 includes a plurality of circumferentially divided portions 25 and 26 that are divided in the circumferential direction and are continuously adjacent to each other in the circumferential direction, and each of the circumferentially divided portions 25 and 26 is a back magnet. It has the parts 25a and 26a and the interpolar magnet parts 25b and 26b. As described above, the interpole magnet portions 25b and 26b and the back magnet portions 25a and 26a are integrated, so that it is possible to prevent the interpole magnet portions 25b and 26b from being detached due to centrifugal force when the rotor rotates. Become. Further, the auxiliary magnet 24 is formed with higher accuracy than the case where the annular auxiliary magnet 24 is integrally formed in advance because the circumferentially divided portions 25 and 26 divided in advance in the circumferential direction are adjacently formed into an annular shape. The circumferential direction division | segmentation parts 25 and 26 can be shape | molded, without using an apparatus.

  (4) As for each circumferential direction division | segmentation part 25 and 26, each interpole magnet part 25b, 26b adjoins the interpolar magnet part 25b, 26b of the other circumferential direction division | segmentation part 25,26. That is, since the circumferential division parts 25 and 26 of the auxiliary magnet 24 are divided by the inter-pole magnet parts 25b and 26b, the back magnet parts 25a and 26a of the circumferential division parts 25 and 26 are claw-shaped magnetic poles. Can be covered. Thereby, the separation | spacing of the interpole magnet parts 25b and 26b can be suppressed.

In addition, you may change the said 1st Embodiment as follows.
-In above-mentioned 1st Embodiment, although the circumferential direction division | segmentation parts 25 and 26 of the auxiliary magnet were comprised separately, you may comprise a back magnet part and an interpolar magnet part integrally in a ring (integral molding). . For example, as shown in FIG. 9, the circumferentially divided portions 25 and 26 that come into contact with the claw-shaped magnetic poles 21b and 22b may be integrally formed in an annular shape. By setting it as such a structure, a number of parts can be suppressed more.

  In the first embodiment, although not particularly mentioned, as shown in FIG. 10, an anisotropic magnet (polar anisotropy) in which the magnetic flux is directed to the circumferential direction dividing portions 25 and 26 of the auxiliary magnet in a specific direction. (Magnet). By adopting such a configuration, the effect of generating a strong magnetic flux directed to a specific direction by the anisotropic magnet in each claw-shaped magnetic pole is enhanced. Therefore, the effect of securing the torque of the rotor is high.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to the drawings. In addition, in this embodiment, since the structure of an auxiliary magnet differs compared with the said embodiment, this point is mainly described. Moreover, the same code | symbol is attached | subjected about the same member as 1st Embodiment, and part or all of description is omitted.

  As shown in FIG. 5, the auxiliary magnet 31 includes a plurality of circumferentially divided portions 32 that are divided at substantially equal angles in the circumferential direction by the number of pole pairs (5 in the present embodiment), and these circumferentially divided portions 32. Are continuously adjacent in the circumferential direction. The auxiliary magnet 31 can be formed as a sintered magnet or a bonded magnet, and an SmFeN magnet, an SmCo magnet, a ferrite magnet, or a neodymium magnet can be used.

  As shown in FIG. 6, the circumferential dividing portion 32 includes two interpole magnet portions 32 a, both side back magnet portions 32 b positioned on the outer side in the circumferential direction than the interpole magnet portions 32 a, and the interpole magnet portion 32 a. And a central back magnet part 32c positioned therebetween.

  The interpolar magnet portion 32a is located between the first claw-shaped magnetic pole 21b and the second claw-shaped magnetic pole 22b in the circumferential direction, and is in contact with the first interpolar magnet portion in the circumferential direction of the first embodiment. 25b and the second inter-pole magnet portion 26b are integrally formed. That is, the interpole magnet portion 32a is configured to have a circumferential thickness (length) equivalent to a clearance between the first claw-shaped magnetic pole 21b and the second claw-shaped magnetic pole 22b in the circumferential direction.

  The central back magnet portion 32c corresponds to the second back auxiliary magnet 26a of the first embodiment, and is disposed between the back surface 22e of the second claw-shaped magnetic pole 22b and the outer peripheral surface 21f of the first core base 21a. . The central back magnet portion 32c has a fan-shaped cross section in the direction perpendicular to the axis.

  As shown in FIGS. 5 and 6, the back magnet portions 32b on both sides correspond to the first back magnet portion 25a of the first embodiment, and the back surface 21e of the first claw-shaped magnetic pole 21b and the second core base 22a. It arrange | positions between 22 f of outer peripheral surfaces. Each of the back magnet portions 32b on both sides of the circumferential dividing portion 32 is configured to have a circumferential thickness (length) that is half the circumferential width of the first claw-shaped magnetic pole 21b or the second claw-shaped magnetic pole 22b. Has been. In addition, both the back magnet parts 32b which contact | abut in the circumferential direction will be corresponded to the 1st back magnet part 25a of the said 1st Embodiment. Then, as shown in FIG. 5, at the substantially central position in the circumferential direction on the back surface of the first claw-shaped magnetic pole 21 b, the both-side back magnet portions 32 b of the circumferential direction dividing portion 32 are arranged in an annular form in contact with each other in the circumferential direction. ing.

Next, the operation of this embodiment will be described.
In the auxiliary magnet 31 according to the present embodiment, the circumferential direction dividing portion 32 is divided into equal numbers in the circumferential direction by the number of pole pairs. For this reason, each circumferential direction division | segmentation part 32 contact | abuts the claw-shaped magnetic pole of a 1st rotor core or the claw-shaped magnetic pole of a 2nd rotor core in radial direction, and will be hold | maintained by each claw-shaped magnetic pole 21b, 22b.

  Further, in each circumferential direction dividing portion 32, both side back magnet portions 32b are adjacent (contacted) in the circumferential direction. For this reason, there is a possibility that a slight gap may occur between the back magnet portions 32b on both sides compared to the case where the adjacent back magnet portions 32b are integrated, but the back magnet portions 32b are magnetized in a generally radial direction. Therefore, this gap is suppressed from becoming a magnetic resistance.

Next, characteristic effects of the present embodiment will be described.
(5) The circumferential direction dividing parts 32 are divided into equal numbers in the circumferential direction by the number of pole pairs, so that each circumferential direction dividing part 32 inevitably has the claw-shaped magnetic pole 21b of the first rotor core 21 or the second rotor core 22. The claw-shaped magnetic poles 22b of the rotor cores 22b can prevent the circumferentially divided portions 32 (auxiliary magnets 31) from coming off from the rotor cores 21 and 22 when the rotor rotates.

  (6) Each of the circumferentially divided portions 32 has the both side back magnet portions 32b adjacent to the both side back magnet portions 32b of the other circumferentially divided portions 32, so that the dividing position is on the back surface of each claw-shaped magnetic pole 21b, 22b. It becomes a certain both-sides back magnet part 32b. Since the back magnet portions 32b on both sides are magnetized in the radial direction, it is possible to suppress the division position between the circumferential division portions 32 from becoming a magnetic resistance. Thereby, it can contribute to the high output of a motor.

In addition, you may change the said 2nd Embodiment as follows.
In the second embodiment, although not particularly mentioned, for example, as shown in FIGS. 7 and 8, the annular magnet 23 as a field magnet is integrated with the circumferentially divided portion 32 (auxiliary magnet 35) in the radial direction. May be used. When integrating with each circumferential division | segmentation part 32, it is set as the structure which integrates the fan-shaped magnet 23a which divided | segmented the said annular magnet 23 in the circumferential direction, and the circumferential division | segmentation part 32, and arrange | positions these annularly in the circumferential direction. By setting it as such a structure, since the auxiliary magnet 35 is integrated with the said annular magnet 23 in radial direction, the number of parts can further be suppressed. In addition, it is possible to more reliably prevent the interpolar magnet portion 32a from coming off during rotor rotation.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to the drawings. In addition, in this embodiment, since the structure of an auxiliary magnet differs compared with the said embodiment, this point is mainly described. Moreover, the same code | symbol is attached | subjected about the same member as 1st Embodiment or 2nd Embodiment, and part or all of description is omitted.

As shown in FIG. 11, the auxiliary magnet 41 is integrally formed in an annular shape, and includes an anisotropic magnet portion 42 and an isomer portion 43 having a magnetic characteristic different from that of the anisotropic magnet portion.
The anisotropic magnet part 42 is composed of a polar anisotropic magnet having polar anisotropic orientation. The anisotropic magnet part 42 has an annular shape and includes a back magnet part 42a and an interpolar magnet part 42b.

  As shown in FIG. 11, the back magnet part 42 a has a slit part 42 c that is concave at the center in the circumferential direction and radially inward. The slit part 42c of the present embodiment is formed at the pole center (the center in the circumferential direction of the pole) of the anisotropic magnet part 42. Moreover, the slit part 42c is formed so that the radial direction length may be more than half of the radial direction length of the back magnet part 42a.

  As shown in FIG. 11, the slit portion 42 c is provided with an isomer portion 43 having a different contraction rate from the anisotropic magnet portion 42 because the anisotropic magnet portion 42 has different magnetic characteristics. In this embodiment, for example, an isotropic magnet can be adopted as the isomer portion 43.

Next, the operation of this embodiment will be described.
The auxiliary magnet 41 of the present embodiment includes an isomer portion 43 having a magnetic characteristic (shrinkage rate) different from that of the anisotropic magnet portion 42 in addition to the substantially annular anisotropic magnet portion 42. Here, at the time of firing or sintering, the shrinkage rate differs between the crystal orientation of the anisotropic magnet portion 42 that is easily magnetized (easy magnetization axis direction) and the orientation that is difficult to magnetize (hard magnetization axis direction). For this reason, when an anisotropic magnet part is used for a part of annular | circular shaped auxiliary | assistant magnet, internal stress accumulate | stores and there exists a possibility that an auxiliary | assistant magnet may be broken. Therefore, as described above, the isomer portions 43 having different shrinkage rates can absorb the difference in shrinkage rate that differs between the easy magnetization axis direction and the hard magnetization direction of the anisotropic magnet portion 42.

Next, characteristic effects of the present embodiment will be described.
(7) The auxiliary magnet 41 is integrally formed in an annular shape, and includes an anisotropic magnet portion 42 and an anisotropic portion having magnetic characteristics different from those of the anisotropic magnet portion. Here, the anisotropic magnet part 42 has different shrinkage ratios in the crystal orientation (magnetization easy axis direction) and the magnetization difficulty (magnetization axis direction) that are easily magnetized during firing and sintering. For this reason, when the anisotropic magnet part 42 is used for a part of the annular auxiliary magnet 41, internal stress may be accumulated and the auxiliary magnet 41 may be broken. For this reason, by providing the auxiliary magnet 41 with an isomer portion 43 having a magnetic characteristic different from that of the anisotropic magnet portion 42, the difference in shrinkage between the isomer portion 43 and the anisotropic magnet portion 42 is utilized. The concentration of internal stress can be alleviated and cracking of the auxiliary magnet 41 can be suppressed.

  (8) By adopting an isotropic magnet as the isomer portion 43 of the auxiliary magnet 41, the internal stress of the auxiliary magnet 41 is relaxed to suppress the occurrence of cracks, and compared with the case where the isomer portion 43 is a gap. Thus, the magnetic force (magnetic flux density) generated can be increased.

  (9) Since the isomer portion 43 of the auxiliary magnet 41 is provided on the radially inner side of the auxiliary magnet 41, the isomer portion 43 such as a gap is not provided on the radially outer side, so that the shape change on the radially outer side is suppressed. be able to.

(10) Since the anisotropic magnet portion 42 is composed of a polar anisotropic magnet, the maximum magnetic flux density can be increased as compared with a radially oriented anisotropic magnet.
In addition, you may change the said 3rd Embodiment as follows.

  In the third embodiment, the radial length of the slit portion 42c is set to be more than half the radial length of the back magnet portion 42a, and the radial length of the isomer portion 43 is the same as that of the slit portion 42c. However, the present invention is not limited to this. For example, as shown in FIG. 12, it is good also considering the radial direction length of the slit part 42c and the isomer part 43 as the half or less of the radial direction length of the back magnet part 42a.

  In the third embodiment, the isomer portion 43 is provided at the circumferential center (pole center) of the back magnet portion 42a. However, the isomer portion 43 is provided in the interpole magnet portion 42b as shown in FIG. A configuration may be adopted.

  In the third embodiment, the anisotropic magnet portion 42 is configured by integrally forming the back magnet portion 42a and the interpolar magnet portion 42b. However, the present invention is not limited to this. For example, as shown in FIG. 14, the back magnet part 42a and the interpole magnet part 42b may be separated. Further, in this case, the anisotropic magnet portion 42 is not a polar anisotropic magnet, but the back magnet portion 42a is configured by a radially oriented anisotropic magnet, and the interpolar magnet portion 42b is an isomeric portion. You may comprise with a property magnet. In FIG. 14, a gap 45 as an isomer portion is formed on the radially inner side of the interpole magnet portion 42 b.

  In the third embodiment, the isomer portion 43 is formed of an isotropic magnet. However, as shown in FIGS. 15A and 15B, the air gap 46 may be adopted as the isomer portion. By setting it as such a structure, the internal stress of an auxiliary magnet is reliably relieved by the space | gap 46, and generation | occurrence | production of a crack can be suppressed more.

(Fourth embodiment)
Next, a third embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected about the same member as 1st Embodiment, and part or all of description is omitted.

Next, a third embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected about the same member as 1st Embodiment, and part or all of description is omitted.
As shown in FIG. 16, the auxiliary magnet 51 includes a plurality of axially divided parts 52 to 54 that are divided in the axial direction, and the axially divided parts 52 to 54 are continuously adjacent to each other in the axial direction. The The axial division parts 52 to 54 are obtained by dividing the auxiliary magnet 51 into three parts in the axial direction, a central division part 52 at the center in the axial direction, and both side division parts 53 located on both sides in the axial direction of the central division part 52. 54.

Each division part 52-54 has interpolar magnet part 52a, 53a, 54a and back magnet part 52b, 53b, 54b.
As shown in FIG. 16, each of the both-side split portions 53 and 54 includes one back magnet portion 53b and 54b, and an interpole magnet portion 53a extending radially outward on both circumferential sides of the back magnet portions 53b and 54b. , 54a are formed in the same number as the number of pole pairs.

  As shown in FIG. 16, the central divided portion 52 is formed by integrally forming the inter-pole magnet portions 52 a and the back magnet portions 52 b corresponding to the number of poles. Further, the central division 52 further integrally forms the annular magnet 23 as the field magnet of the first embodiment.

Next, the operation of this embodiment will be described.
The auxiliary magnet 51 of the present embodiment is configured by continuously adjoining a plurality of axial direction division parts 52 to 54 divided in the axial direction in the axial direction. The axial direction division parts 52-54 have the back magnet parts 52b, 53b, and 54b and the interpolar magnet parts 52a, 53a, and 54a, respectively. By adopting such a configuration, generation of gaps and the like in the circumferential direction is suppressed as compared with the case where the auxiliary magnet 51 is divided in the circumferential direction, and the interpolar magnet portions 52a, 53a, and 54a of the axially divided portions 52 to 54 are suppressed. And it can suppress that back magnet part 52b, 53b, 54b becomes a magnetic resistance.

Next, characteristic effects of the present embodiment will be described.
(11) The auxiliary magnet 51 includes a plurality of axially divided portions 52 to 54 that are divided in the axial direction and are continuously adjacent to each other in the axial direction. The axially divided portions 52 to 54 are respectively back magnet portions. 52b, 53b, 54b and the interpolar magnet portions 52a, 53a, 54a. Thus, by dividing | segmenting into an axial direction, it can suppress that the interpolar magnet parts 52a, 53a, 54a and the back magnet parts 52b, 53b, 54b become magnetic resistance.

  (12) The axially divided portions 52 to 54 are integrated with the annular magnet 23 as the field magnet in the radial direction in the centrally divided portion 52 that is the axially divided portion at the center in the axial direction. In this way, the number of parts is reduced by being integrated with the annular magnet 23.

Note that the fourth embodiment may be modified as follows.
In the fourth embodiment, the auxiliary magnet 51 is configured by the axially divided portions 52 to 54 that are divided into three in the axial direction, but is not limited thereto. For example, as shown in FIG. 17, the auxiliary magnet 51 may be configured by axially dividing axially divided portions 56 and 57 that are divided into two in the axial direction and continuously adjacent to each other in the axial direction. Specifically, the axial direction division parts 56 and 57 of the auxiliary magnet 51 have interpolar magnet parts 56a and 57a and back magnet parts 56b and 57b. The interpolar magnet portions 56a and 57a and the back magnet portions 56b and 57b of the axial direction division portions 56 and 57 are integrally formed in an annular shape in the respective axial direction division portions 56 and 57. By setting it as such a structure, it becomes the axial direction division parts 56 and 57 of the same shape. Further, when such two divided axially divided portions 56 and 57 are molded, the mold can be easily removed. Similarly, the axially divided portions 56 and 57 can be formed of only one type of mold. Moreover, you may integrally form the division body 23b which divided | segmented the annular magnet 23 of 1st Embodiment to the axial direction in each of the axial direction division parts 56 and 57. As shown in FIG. In this way, the number of parts is reduced by being integrated with the annular magnet 23.

Further, the above embodiments may be modified as follows.
In each of the above embodiments, one annular magnet 23 is used as a field magnet. However, a plurality of permanent magnets are arranged between the first and second core bases 21a and 22a around the rotation shaft 12. You may employ | adopt the structure to do.

In each of the above embodiments, although not particularly mentioned, the first and second rotor cores 21 and 22 and the armature core 7 may be configured by, for example, lamination of magnetic metal plate materials or molding of magnetic powder. .
In each of the above embodiments, no particular reference is made to the winding method of the stator 6 on the teeth, but concentrated winding or distributed winding may be used.

Other technical ideas will be described below.
(Supplementary Note 1) A first rotor core having a plurality of first claw-shaped magnetic poles projecting radially outward and extending in the axial direction on the outer periphery of a substantially disk-shaped first core base; A plurality of second claw-shaped magnetic poles project radially outward and extend in the axial direction on the outer periphery of the disc-shaped second core base, and each of the second claw-shaped magnetic poles corresponds to each other. The second rotor core disposed between the first claw-shaped magnetic poles of the first rotor core and the axial direction between the first core base and the second core base are magnetized in the axial direction. A field magnet that causes the first claw-shaped magnetic pole to function as a first magnetic pole and the second claw-shaped magnetic pole to function as a second magnetic pole; and the first claw-shaped magnetic pole and the second claw-shaped magnetic pole. The magnetic poles are arranged between the circumferential directions and have the same poles as the first and second claw-shaped magnetic poles. An interpole magnet portion that is arranged, and a back magnet portion that is disposed on the back surface of the first and second claw-shaped magnetic poles and is magnetized so that the same polarity as the first and second magnetic poles is radially outward. And an auxiliary magnet that is formed integrally with the claw-shaped magnetic poles and abuts in the radial and circumferential directions.

  In this configuration, an interpole magnet portion that is disposed between the first claw-shaped magnetic pole and the second claw-shaped magnetic pole and is magnetized so as to have the same pole as the first and second claw-shaped magnetic poles, Each of the claw-shaped magnets is integrally formed with a back magnet portion that is arranged on the back surfaces of the first and second claw-shaped magnetic poles and is magnetized so that the same polarity as the first and second magnetic poles is radially outward. And an auxiliary magnet that abuts in the radial direction and the circumferential direction. Thus, by providing the auxiliary magnet formed by integrally forming the interpole magnet portion and the back magnet portion, it is possible to suppress the leakage magnetic flux while suppressing the number of components.

(Appendix 2) In the rotor described above, the auxiliary magnet has a magnetization direction in the same direction as each of the claw-shaped magnetic poles functioning as first and second magnetic poles by the field magnet.
In this configuration, the auxiliary magnet has the same magnetization direction as each of the claw-shaped magnetic poles functioning as the first and second magnetic poles by the field magnet. Thereby, the magnetic flux on the outer surface of the claw-shaped magnetic pole can be increased.

  (Supplementary Note 3) In the rotor described above, the auxiliary magnet is configured by continuously adjoining a plurality of circumferentially divided portions divided in the circumferential direction in the circumferential direction, and each of the circumferentially divided portions is respectively It has the back magnet part and the interpolar magnet part.

  In this configuration, the auxiliary magnet is configured such that a plurality of circumferentially divided portions divided in the circumferential direction are continuously adjacent to each other in the circumferential direction, and each of the circumferentially divided portions includes the back magnet portion, And an inter-pole magnet section. Thus, by integrating the interpole magnet portion and the back magnet portion, it is possible to prevent the interpole magnet portion from being detached by centrifugal force when the rotor rotates. In addition, the auxiliary magnet is preliminarily divided in the circumferential direction into an annular shape adjacent to the circumferentially divided portion, and therefore, without using a high-precision molding device as compared with the case of previously forming the annular auxiliary magnet, A circumferential division | segmentation part can be shape | molded.

(Appendix 4) In the rotor described above, each of the circumferentially divided portions has each of the interpole magnet portions adjacent to the interpole magnet portion of another circumferentially divided portion.
In this structure, each circumferential direction division | segmentation part has each said interpole magnet part adjacent to the interpole magnet part of another circumferential direction division | segmentation part. That is, since the circumferentially divided portion of the auxiliary magnet is divided by the interpole magnet portion, the back magnet portion of the circumferentially divided portion can be covered with the claw-shaped magnetic poles. Thereby, separation of the interpolar magnet part can be suppressed.

(Supplementary Note 5) In the rotor described above, the circumferentially divided portion is divided into equal angles in the circumferential direction by the number of pole pairs.
In this configuration, the circumferentially divided portion is divided into equal numbers in the circumferential direction by the number of pole pairs, so that each circumferentially divided portion inevitably has a claw-shaped magnetic pole of the first rotor core or a claw-shaped magnetic pole of the second rotor core. As a result, it is possible to prevent the circumferentially divided portion (auxiliary magnet) from coming off from the rotor core during rotor rotation.

(Appendix 6) In the rotor described above, each of the circumferentially divided portions has each of the backside magnet portions adjacent to the backside magnet portion of another circumferentially divided portion.
In this structure, each circumferential direction division | segmentation part becomes a back magnet part whose division | segmentation position is a back surface of each claw-shaped magnetic pole, when each said back surface magnet part adjoins the back surface magnet part of another circumferential direction division | segmentation part. Since this back magnet part is magnetized substantially in the radial direction, it is possible to suppress the division position between the circumferential division parts from becoming a magnetic resistance. Thereby, it can contribute to the high output of a motor.

(Appendix 7) In the rotor described above, the auxiliary magnet is integrated with the field magnet in the radial direction.
In this configuration, since the auxiliary magnet is integrated with the field magnet in the radial direction, the number of parts can be further suppressed. Further, it is possible to more reliably prevent the interpole magnet portion from coming off during the rotation of the rotor.

  (Supplementary note 8) In the rotor described above, the auxiliary magnet includes a plurality of axially divided portions that are divided in the axial direction and are continuously adjacent to each other in the axial direction. It has a back magnet part and the interpolar magnet part.

  In this configuration, the auxiliary magnet includes a plurality of axially divided portions that are divided in the axial direction and are continuously adjacent to each other in the axial direction. The axially divided portions include the back magnet portion and the pole, respectively. And a magnet portion. Thus, by dividing | segmenting into an axial direction, it can suppress that an interpolar magnet part and a back magnet part become a magnetic resistance.

(Supplementary Note 9) In the rotor described above, the auxiliary magnet includes the axially divided portions that are divided into two in the axial direction and are adjacent to each other in the axial direction.
In this configuration, the auxiliary magnet is configured such that the axially divided portions that are divided in two in the axial direction are continuously adjacent to each other in the axial direction, so that when each axially divided portion is molded, The mold can be easily removed.

  (Supplementary note 10) In the rotor according to the above, the auxiliary magnet is configured such that the axially divided portion divided in three in the axial direction is continuously adjacent in the axial direction, and the axially divided portion has a shaft thereof. An axial division at the center in the direction is integrated with the field magnet in the radial direction.

  In this configuration, the auxiliary magnet is configured such that the axially divided portion divided in three in the axial direction is continuously adjacent in the axial direction, and the axially divided portion is an axially divided portion at the center in the axial direction. Is integrated with the field magnet in the radial direction. In this way, the number of parts can be reduced by being integrated with the field magnet.

  -By the way, in the above motors, there was a gap between adjacent claw-shaped magnetic poles, and magnetic flux leaked from this gap. Further, for example, if a gap is formed on the back surface of the claw-shaped magnetic pole, the magnetic flux may leak from the gap. If the leakage flux increases, it may cause a decrease in the output of the motor. Therefore, some countermeasure is required, but there is a demand for a structure that does not increase the number of parts.

  The following configuration has been made to solve the above-described problems, and an object thereof is to provide a rotor and a motor that can realize a structure in which leakage magnetic flux is suppressed with a reduced number of parts. .

  The rotor that solves the above-described problem is a first disk in which a plurality of first claw-shaped magnetic poles protrude radially outward and extend in the axial direction at equal intervals on the outer periphery of the substantially disk-shaped first core base. A plurality of second claw-shaped magnetic poles project radially outward and extend in the axial direction on the outer peripheral portion of one rotor core and a substantially disc-shaped second core base, and extend in the axial direction. A magnetic pole is disposed between the first claw-shaped magnetic poles of the corresponding first rotor core, and is disposed between the first core base and the second core base in the axial direction. By being magnetized, a field magnet that causes the first claw-shaped magnetic pole to function as a first magnetic pole and the second claw-shaped magnetic pole to function as a second magnetic pole, the first claw-shaped magnetic pole, and the second magnetic pole The first and second claw-shaped magnetic poles are disposed between the claw-shaped magnetic poles and the circumferential direction. An inter-pole magnet portion magnetized so as to be a bipolar pole, and disposed on the back surface of the first and second claw-shaped magnetic poles, and the same polarity as the first and second magnetic poles is radially outward. An auxiliary magnet that is formed integrally with a magnetized back magnet portion and abuts each of the claw-shaped magnetic poles in the radial direction and the circumferential direction. The auxiliary magnet has an isotropic magnet part and an isomer part having a magnetic characteristic different from that of the anisotropic magnet part, and the isomer part of the auxiliary magnet is provided radially inside the back magnet part of the auxiliary magnet. It has been.

In the rotor described above, the isomer portion of the auxiliary magnet is provided at the center in the circumferential direction of the pole in the back magnet portion.
The rotor that solves the above-described problem is a first disk in which a plurality of first claw-shaped magnetic poles protrude radially outward and extend in the axial direction at equal intervals on the outer periphery of the substantially disk-shaped first core base. A plurality of second claw-shaped magnetic poles project radially outward and extend in the axial direction on the outer peripheral portion of one rotor core and a substantially disc-shaped second core base, and extend in the axial direction. A magnetic pole is disposed between the first claw-shaped magnetic poles of the corresponding first rotor core, and is disposed between the first core base and the second core base in the axial direction. Magnetized to cause the first claw-shaped magnetic pole to function as a first magnetic pole and the second claw-shaped magnetic pole to function as a second magnetic pole; and the first and second claw-shaped magnetic poles The same polarity as the first and second magnetic poles is disposed on the back surface and radially outward A magnet that is magnetized in such a manner that it extends radially outward from the back magnet part and is disposed between the first claw-shaped magnetic pole and the second claw-shaped magnetic pole in the circumferential direction. And an auxiliary magnet that is integrally formed with an interpole magnet portion that is magnetized so as to have the same pole as the second claw-shaped magnetic pole, and that is in contact with each claw-shaped magnetic pole in the radial direction and the circumferential direction. Is integrally configured in an annular shape, and has an anisotropic magnet portion and an isomer portion having different magnetic characteristics from the anisotropic magnet portion, and the isomer portion of the auxiliary magnet is: It is provided on the radially inner side of the interpole magnet portion of the auxiliary magnet.

  In the configuration of each of the rotors described above, a pole that is arranged between the first claw-shaped magnetic pole and the second claw-shaped magnetic pole and is magnetized so as to have the same pole as the first and second claw-shaped magnetic poles An intermediate magnet portion and a back magnet portion that is disposed on the back surfaces of the first and second claw-shaped magnetic poles and is magnetized so that the same polarity as the first and second magnetic poles is radially outward are formed integrally. Each claw-shaped magnetic pole and an auxiliary magnet that abuts in the radial and circumferential directions. Thus, by providing the auxiliary magnet formed by integrally forming the interpole magnet portion and the back magnet portion, it is possible to suppress the leakage magnetic flux while suppressing the number of components.

  Further, in the configuration of each rotor described above, the auxiliary magnet is integrally formed in an annular shape, and has an anisotropic magnet portion and an isomer portion having a magnetic characteristic different from that of the anisotropic magnet portion. Here, the shrinkage rate of the anisotropic magnet portion is different between a crystal orientation that is easily magnetized (easy magnetization axis direction) and a magnetization difficulty orientation (hard magnetization axis direction) during firing and sintering. For this reason, when an anisotropic magnet part is used for a part of annular | circular shaped auxiliary | assistant magnet, internal stress accumulate | stores and there exists a possibility that an auxiliary | assistant magnet may be broken. For this reason, by providing the auxiliary magnet with an isomer part having magnetic characteristics different from those of the anisotropic magnet part, the concentration of internal stress can be concentrated by utilizing the difference in shrinkage ratio between the isomer part and the anisotropic magnet part. It can be mitigated and cracking of the auxiliary magnet can be suppressed.

  Further, in each rotor configuration described above, the isomer portion of the auxiliary magnet is provided on the radially inner side of the auxiliary magnet, so that no isomer portion such as a void is provided on the radially outer side, so that the radially outer portion is provided. The shape change can be suppressed.

In the rotor described above, the isomer portion of the auxiliary magnet is an isotropic magnet.
In this configuration, by adopting an isotropic magnet as the isomer part of the auxiliary magnet, the internal stress of the auxiliary magnet is relaxed to suppress the occurrence of cracks, compared with the case where the isomer part is a void. The generated magnetic force can be increased.

In the rotor described above, the isomer portion of the auxiliary magnet is a gap.
In this configuration, since the isomer portion of the auxiliary magnet is a gap, the internal stress of the auxiliary magnet is reliably relieved by the gap, and the occurrence of cracks can be further suppressed.

-The above-mentioned rotor WHEREIN: The said anisotropic magnet part is comprised with a polar anisotropic magnet.
In this configuration, since the anisotropic magnet portion is composed of a polar anisotropic magnet, the maximum magnetic flux density can be increased as compared with a radially oriented anisotropic magnet.

  -The motor which solves the above-mentioned subject is provided with the above-mentioned rotor.

  DESCRIPTION OF SYMBOLS 10 ... Motor, 11 ... Rotor, 21 ... 1st rotor core, 21a ... 1st core base, 21b ... 1st claw-shaped magnetic pole, 21e, 22e ... Back surface, 22 ... 2nd rotor core, 22a ... 2nd core base, 22b ... 2nd claw-shaped magnetic pole, 23 ... annular magnet (field magnet), 24, 31, 35, 41, 51 ... auxiliary magnet, 25, 26, 32 ... circumferential direction division part, 25a, 26a, 32b, 42a, 52b, 53b, 54b, 56b, 57b ... back magnet part, 25b, 26b, 32a, 42b, 52a, 53a, 54a, 56a, 57a ... interpolar magnet part, 42 ... anisotropic magnet part, 43 ... isomer part, 45 , 46 ... gaps, 52 to 54, 56, 57 ... axially divided portions.

Claims (8)

A first rotor core having a plurality of first claw-shaped magnetic poles protruding radially outward and extending in the axial direction at an outer peripheral portion of a substantially disc-shaped first core base;
A plurality of second claw-shaped magnetic poles project radially outward and extend in the axial direction on the outer periphery of the substantially disk-shaped second core base, and correspond to each of the second claw-shaped magnetic poles. A second rotor core disposed between the first claw-shaped magnetic poles of the first rotor core;
The first claw-shaped magnetic pole is arranged between the first core base and the second core base and is magnetized in the axial direction so that the first claw-shaped magnetic pole functions as the first magnetic pole, and the second claw-shaped A field magnet that causes the magnetic pole to function as a second magnetic pole;
An annular shape having a first back magnet portion disposed on the back surface of the first claw-shaped magnetic pole and a second back magnet portion disposed on the back surface of the second claw-shaped magnetic pole and surrounding an outer periphery of the field magnet. Polar anisotropic magnets,
With
The polar anisotropic magnet has a polar anisotropic orientation that curves to the field magnet side from the first back magnet part to the adjacent second back magnet part ,
An inner peripheral surface of the polar anisotropic magnet is in contact with an outer peripheral surface of the first core base and an outer peripheral surface of the second core base . A first rotor core having a plurality of first claw-shaped magnetic poles protruding radially outward and extending in the axial direction at an outer peripheral portion of a substantially disc-shaped first core base;
A plurality of second claw-shaped magnetic poles project radially outward and extend in the axial direction on the outer periphery of the substantially disk-shaped second core base, and correspond to each of the second claw-shaped magnetic poles. A second rotor core disposed between the first claw-shaped magnetic poles of the first rotor core;
The first claw-shaped magnetic pole is arranged between the first core base and the second core base and is magnetized in the axial direction so that the first claw-shaped magnetic pole functions as the first magnetic pole, and the second claw-shaped A field magnet that causes the magnetic pole to function as a second magnetic pole;
An annular shape having a first back magnet portion disposed on the back surface of the first claw-shaped magnetic pole and a second back magnet portion disposed on the back surface of the second claw-shaped magnetic pole and surrounding an outer periphery of the field magnet. Polar anisotropic magnets,
With
The polar anisotropic magnet has a polar anisotropic orientation that curves to the field magnet side from the first back magnet part to the adjacent second back magnet part,
The rotor according to claim 1, wherein an inner peripheral surface of the polar anisotropic magnet is in contact with an outer peripheral surface of the field magnet. The rotor according to claim 1 or 2 ,
The polar anisotropic magnet includes an interpole magnet portion disposed between circumferential directions of the first claw-shaped magnetic pole and the second claw-shaped magnetic pole. The rotor according to claim 3 , wherein
The rotor is characterized in that the interpolar magnet portion extends radially outward from the first back magnet portion and the second back magnet portion. The rotor according to any one of claims 1 to 4 ,
The rotor, wherein the first back magnet part and the second back magnet part are arranged so as to be shifted from each other in the axial direction. The rotor according to any one of claims 1 to 5 ,
The rotor, wherein the first claw-shaped magnetic pole and the first back magnet part, and the second claw-shaped magnetic pole and the second back magnet part are alternately arranged in a circumferential direction. The rotor according to any one of claims 1 to 6 ,
The polar anisotropic magnet is integrally formed in an annular shape. A motor comprising the rotor according to any one of claims 1 to 7 .