JP6181518B2 - Rotor and motor - Google Patents

Description

  The present invention relates to a rotor and a motor.

  The rotor of the motor includes two rotor cores that are combined with a plurality of claw-shaped magnetic poles on the outer periphery of the core base, and a field magnet that is arranged between them and magnetized in the axial direction. There is a so-called permanent magnet field Landell-type rotor that allows the magnetic poles to alternately function as different magnetic poles. Such a rotor is arranged between the claw-shaped magnetic poles arranged between the claw-shaped magnetic poles and the field magnet and magnetized in the radial direction to suppress leakage magnetic flux therebetween, and the claw-shaped magnetic poles adjacent in the circumferential direction. And an auxiliary magnet that is magnetized in the circumferential direction and includes an inter-pole magnet for suppressing leakage magnetic flux therebetween (see, for example, Patent Document 1).

JP 2012-115085 A

  However, in the rotor as described above, the shape of the outer peripheral portion of the field magnet viewed from the axial direction is circular, and the outer peripheral surface thereof is generally close to the auxiliary magnet (back magnet and interpole magnet). There is a risk that the auxiliary magnet (back magnet and interpole magnet) may be demagnetized by the magnetic flux (short-circuit magnetic flux) of the field magnet.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to reduce the demagnetization of the auxiliary magnet composed of the back magnet and the interpole magnet due to the magnetic flux of the field magnet. It is to provide a rotor and a motor that can be used.

In the rotor that solves the above-described problems, a plurality of claw-shaped magnetic poles are projected radially outward at equal intervals on the outer periphery of the core base, and are extended in the axial direction. The claw-shaped magnetic poles of the first rotor core are arranged between the first and second rotor cores in which the magnetic poles are alternately arranged in the circumferential direction, and are magnetized in the axial direction between the core bases. Is disposed between the claw-shaped magnetic pole and the field magnet, and the leakage between the field magnet and the field magnet that functions as the first magnetic pole and the claw-shaped magnetic pole of the second rotor core as the second magnetic pole. A rotor provided with a back magnet for suppressing magnetic flux and an auxiliary magnet that is disposed between the claw-shaped magnetic poles adjacent in the circumferential direction and is composed of at least one of interpolar magnets for suppressing leakage magnetic flux therebetween. And the field magnet At least field magnet of the serial auxiliary magnets are formed non-contact portion for partially blocking contact with each other, the shape of the outer peripheral portion of the field magnet as viewed in the axial direction polygonal As a result, the side portion of the field magnet viewed from the axial direction is the non-contact portion .

According to this configuration, at least the field magnet of the field magnet and the auxiliary magnet is formed with the non-contact portion for partially blocking the mutual contact. It is possible to partially separate the magnet from the magnet or the interpole magnet), and it is possible to reduce the demagnetization of the auxiliary magnet due to the magnetic flux of the field magnet.

According to the same configuration, since the shape of the outer peripheral portion of the field magnet viewed from the axial direction is a polygon, the side portion of the field magnet viewed from the axial direction is a non-contact portion, It is possible to reduce the demagnetization of the auxiliary magnet by the magnetic flux of the field magnet with a simple configuration.

In the rotor, the shape of the outer peripheral portion of the field magnet viewed from the axial direction is preferably a regular polygon having the same number of angles as the number of magnetic poles.
According to the same configuration, since the shape of the outer peripheral portion of the field magnet viewed from the axial direction is a regular polygon having the same number of corners as the number of magnetic poles, the corners are the same as each back magnet or each interpole magnet. The magnetic pole can be provided close to the circumferential position, and the magnetic poles can be provided in a balanced manner in the circumferential direction. Moreover, since it is a regular polygon, manufacture of a field magnet becomes easy.

In the rotor, it is preferable that the angle of the field magnet is disposed at a center position in a circumferential direction of the interpole magnet.
According to this configuration, the angle of the field magnet is arranged at the center position in the circumferential direction of the interpole magnet, so that the back magnet is separated from the field magnet as much as possible, and the back magnet is mainly the field magnet. Demagnetization by magnetic flux can be reduced. In addition, since the part which adjoins a field magnet becomes a part also in an interpole magnet, it can reduce demagnetizing by the magnetic flux of a field magnet also in an interpole magnet. Also, the magnetic poles can be provided in a more balanced manner in the circumferential direction.

The said rotor WHEREIN: It is preferable that the said angle | corner of the said field magnet is arrange | positioned in the circumferential direction center position in the said back magnet.
According to this configuration, the angle of the field magnet is arranged at the center position in the circumferential direction of the back magnet, so that the interpole magnet is separated from the field magnet as much as possible, and the interpole magnet is mainly the field magnet. It is possible to reduce demagnetization due to the magnetic flux. In addition, since the part which adjoins a field magnet becomes a part also in a back magnet, it can reduce demagnetizing by the magnetic flux of a field magnet also in a back magnet. Also, the magnetic poles can be provided in a more balanced manner in the circumferential direction.

Rotor for solving the above-the outer peripheral portion of the core base, respectively, with a plurality of claw-shaped magnetic poles is protruded radially outward at equal intervals formed to extend axially, while another of the core base is facing pawls The claw-shaped magnetic poles of the first rotor core are arranged between the first and second rotor cores in which the magnetic poles are alternately arranged in the circumferential direction, and are magnetized in the axial direction between the core bases. Is disposed between the claw-shaped magnetic pole and the field magnet, and the leakage between the field magnet and the field magnet that functions as the first magnetic pole and the claw-shaped magnetic pole of the second rotor core as the second magnetic pole. A rotor provided with a back magnet for suppressing magnetic flux and an auxiliary magnet that is disposed between the claw-shaped magnetic poles adjacent in the circumferential direction and is composed of at least one of interpolar magnets for suppressing leakage magnetic flux therebetween. And the field magnet The least one of the serial auxiliary magnet is formed with a non-contact portion for partially blocking contact with each other, the non-contact portion is formed in a portion of the axial, the The non-contact portion was formed at a position corresponding to the base end portion of the claw-shaped magnetic pole .
According to this configuration, at least one of the field magnet and the auxiliary magnet is formed with a non-contact portion for partially blocking the mutual contact. It is possible to partially separate from the interpole magnet), and the demagnetization of the auxiliary magnet due to the magnetic flux of the field magnet can be reduced. In addition, since the non-contact portion is formed in a part of the axial direction, the auxiliary magnet is demagnetized by the magnetic flux of the field magnet particularly in the vicinity of the non-contact portion while suppressing the decrease in the magnet amount. Can be reduced.

According to this configuration, the non-contact portion is formed at a position corresponding to the base end portion of the claw-shaped magnetic pole, and therefore, a portion where the magnetic flux of the field magnet particularly gives a large reverse magnetic field to the auxiliary magnet. Thus, it is possible to relax the reverse magnetic field in the region, and to suppress the demagnetization of the auxiliary magnet at the portion. That is, a short-circuit magnetic flux can be generated due to the magnetic flux of the field magnet at a position corresponding to the base end of the claw-shaped magnetic pole (portion where the back magnet is disposed), but a gap having a large magnetic resistance is formed at that position. Thus, the generation of the short-circuit magnetic flux can be suppressed, and the auxiliary magnet can be prevented from being demagnetized significantly by the short-circuit magnetic flux.

In the rotor, it is preferable that the non-contact portion is formed only at a position corresponding to a base end portion of the claw-shaped magnetic pole.
According to this configuration, the non-contact portion is formed only at a position corresponding to the base end portion of the claw-shaped magnetic pole. Magnetism can be suppressed.

In the rotor, the non-contact portion is preferably a chamfered portion.
According to this configuration, since the non-contact portion is a chamfered portion, for example, compared to a non-contact portion that is a stepped portion or the like, it is possible to suppress cracking or chipping of the portion.

Rotor for solving the above-the outer peripheral portion of the core base, respectively, with a plurality of claw-shaped magnetic poles is protruded radially outward at equal intervals formed to extend axially, while another of the core base is facing pawls The claw-shaped magnetic poles of the first rotor core are arranged between the first and second rotor cores in which the magnetic poles are alternately arranged in the circumferential direction, and are magnetized in the axial direction between the core bases. Is disposed between the claw-shaped magnetic pole and the field magnet, and the leakage between the field magnet and the field magnet that functions as the first magnetic pole and the claw-shaped magnetic pole of the second rotor core as the second magnetic pole. A rotor provided with a back magnet for suppressing magnetic flux and an auxiliary magnet that is arranged between the claw-shaped magnetic poles adjacent in the circumferential direction and is composed of at least one of interpolar magnets for suppressing leakage magnetic flux therebetween. And the field magnet At least field magnet of the serial auxiliary magnets are formed non-contact portion for partially blocking contact with each other, the shape of the outer peripheral portion of the field magnet as viewed in the axial direction, the magnetic poles By forming the star-shaped polygon having the same number of radially projecting corners as the number of, the recessed portion of the field magnet viewed from the axial direction is the non-contact portion .
According to this configuration, at least the field magnet of the field magnet and the auxiliary magnet is formed with the non-contact portion for partially blocking the mutual contact. It is possible to partially separate the magnet from the magnet or the interpole magnet), and it is possible to reduce the demagnetization of the auxiliary magnet due to the magnetic flux of the field magnet. In addition, the field magnet viewed from the axial direction has a shape of a star-shaped polygon having an angle protruding outward in the radial direction as many as the number of magnetic poles, as the shape of the outer periphery of the field magnet viewed from the axial direction. Since the recessed portion is the non-contact portion, it is possible to reduce the demagnetization of the auxiliary magnet due to the magnetic flux of the field magnet with a simple configuration. And a corner | angular will be arrange | positioned in the same circumferential direction position of each back magnet or each interpole magnet, and a magnetic pole can be provided with sufficient balance in the circumferential direction.

In the rotor, it is preferable that the back magnet and the interpole magnet are integrally formed to constitute an auxiliary magnet.
According to this configuration, since the back magnet and the interpole magnet are integrally formed to form the auxiliary magnet, the number of parts of the rotor can be reduced as compared with the case where each is separate.

A motor that solves the above problem includes the rotor and a stator that generates a rotating magnetic field.
According to this configuration, the above-described effect can be obtained in the motor.

  In the rotor and motor of the present invention, it is possible to reduce the demagnetization of the auxiliary magnet composed of the back magnet and the interpole magnet due to the magnetic flux of the field magnet.

The partial sectional view of the brushless motor in one embodiment. The partial cross section figure of the rotor in the form. The perspective view of the rotor in the same form. Sectional drawing along the AA line of FIG. The partial cross section figure of the rotor in another example. The exploded perspective view of the rotor in another example. The partial cross section figure of the rotor in another example. The partial cross section figure of the rotor in another example. The partial cross section figure of the rotor in another example. The partial cross section figure of the rotor in another example. The partial cross section figure of the rotor in another example. The partial cross section figure of the rotor in another example. The exploded perspective view of the rotor in another example. The partial cross section figure of the rotor in another example. (A) is a top view of the field magnet in another example. (B) is a side view of a field magnet in another example. (A) is a top view of the field magnet in another example. (B) is a side view of a field magnet in another example. The partial cross section figure of the rotor in another example. The perspective view of the back magnet in another example. The perspective view of the back magnet in another example. The perspective view of the back magnet in another example. The perspective view of the back magnet in another example. The partial cross section figure of the rotor in another example.

Hereinafter, an embodiment of a motor will be described with reference to FIGS.
As shown in FIG. 1, a brushless motor M has a stator 2 fixed to the inner peripheral surface of a motor housing 1, and a so-called Landel that is fixed to a rotating shaft 3 and rotates together with the rotating shaft 3 inside the stator 2. A rotor 4 having a mold structure is provided. The rotating shaft 3 is a stainless steel shaft made of a magnetic material, and is supported by a bearing (not shown) provided on the motor housing 1 so as to be rotatable with respect to the motor housing 1.

  The stator 2 has a cylindrical stator core 10, and the outer peripheral surface of the stator core 10 is fixed to the inner surface of the motor housing 1. Inside the stator core 10, a plurality of teeth 11 formed along the axial direction and arranged at equal pitches in the circumferential direction are formed extending inward in the radial direction. Each tooth 11 is a T-shaped tooth, and an inner circumferential surface 11a on the radially inner side is an arc surface obtained by extending a concentric circular arc centering on the central axis O of the rotating shaft 3 in the axial direction. .

  Slots 12 are formed between the teeth 11 in the circumferential direction. In the present embodiment, the number of teeth 11 is twelve, and the number of slots 12 is twelve, which is the same as the number of teeth 11. The twelve teeth 11 are wound with three-phase windings in the circumferential direction, that is, U-phase windings 13u, V-phase windings 13v, and W-phase wires 13w in order in a concentrated manner. Is arranged.

  Then, a three-phase power supply voltage is applied to each of the phase windings 13u, 13v, 13w to generate a rotating magnetic field in the stator 2, and the rotor 4 fixed to the rotating shaft 3 disposed inside the stator 2 is rotated. It is like that.

  As shown in FIGS. 2 to 4, the rotor 4 includes first and second rotor cores 20 and 30, a field magnet 40, a back magnet 50, and an interpole magnet 51. Note that the back magnet 50 and the interpole magnet 51 constitute an auxiliary magnet G for suppressing leakage magnetic flux as described later.

  The first rotor core 20 is made of a soft magnetic material and is formed of an electromagnetic steel plate in the present embodiment, and has a substantially disc-shaped first core base 21 formed with a boss portion 20a that penetrates and adheres to the rotary shaft 3. ing. A plurality of (four in the present embodiment) first claw-shaped magnetic poles 22 project outward in the radial direction and extend in the axial direction on the outer peripheral surface of the first core base 21 at equal intervals.

  Further, the radially outer surface f1 of the first claw-shaped magnetic pole 22 of the present embodiment has a concentric circular arc surface in which the axial orthogonal cross-sectional shape is centered on the central axis O of the rotating shaft 3, and the radially outer surface Two auxiliary grooves 25 are provided on the side surface f1.

  As shown in FIG. 2, the second rotor core 30 is the same material and shape as the first rotor core 20, and is a substantially disc-shaped second core in which a boss portion 30 a that penetrates and fixes the rotating shaft 3 is formed. A base 31 is provided. On the outer peripheral surface of the second core base 31, a plurality of (four in this embodiment) second claw-shaped magnetic poles 32 project outward in the radial direction and extend in the axial direction at equal intervals.

  Further, the radially outer surface f2 of the second claw-shaped magnetic pole 32 of the present embodiment has a concentric circular arc surface whose center is perpendicular to the central axis O of the rotating shaft 3 and has a radially outer side. Two auxiliary grooves 35 are provided on the side surface f2. The auxiliary grooves 25 and 35 cause a large change in the magnetic field due to fluctuations in the distance between the rotor 4 and the teeth 11 when the rotor 4 is about to rotate due to vibration or the like when not driven. It becomes a load and increases the detent torque.

  And the 1st and 2nd rotor cores 20 and 30 are fixed with respect to the rotating shaft 3 when the rotating shaft 3 is press-fit in the boss | hub parts 20a and 30a. At this time, the second rotor core 30 is arranged such that each second claw-shaped magnetic pole 32 is disposed between the first claw-shaped magnetic poles 22 adjacent in the circumferential direction, and the first core base 21 and the second core base 31 The field magnet 40 is assembled (attached) to the first rotor core 20 in such a manner that the field magnet 40 is disposed (sandwiched) between the first rotor core 20 and the second rotor core 20.

  As shown in FIG. 2, the field magnet 40 is a substantially plate-like permanent magnet having a central hole made of a ferrite magnet or a neodymium magnet, and the first claw-shaped magnetic pole 22 is replaced with a first magnetic pole (main magnetic pole). It is magnetized in the axial direction so that the second claw-shaped magnetic pole 32 functions as a second magnetic pole (S pole in this embodiment). That is, the rotor 4 of the present embodiment is a so-called Landel type rotor. In the rotor 4, four first claw-shaped magnetic poles 22 that are N poles and four second claw-shaped magnetic poles 32 that are S poles are alternately arranged in the circumferential direction, and the number of poles is eight (the number of pole pairs). Is 4). That is, in this embodiment, the number of magnetic poles (number of poles) of the rotor 4 is set to “8”, and the number of teeth 11 (slots 12) of the stator 2 is set to “12”. Yes.

  Further, as shown in FIG. 2, the rotor 4 of the present embodiment is provided between the first and second claw-shaped magnetic poles 22 and 32 in the radial direction (back surface) and with the field magnet 40, and A back magnet 50 magnetized in the radial direction is provided to suppress the leakage (short circuit) magnetic flux of the portion. The back magnet 50 of the present embodiment is formed in a fan shape when viewed from the axial direction, and the radially inner arc surface is an arc surface having the same diameter as the outer peripheral surfaces of the first and second core bases 21 and 31. Yes.

  Further, as shown in FIG. 3, the rotor 4 of the present embodiment is provided between the first and second claw-shaped magnetic poles 22 and 32 in the circumferential direction, and in the circumferential direction to suppress the leakage magnetic flux of that portion. A magnetized interpolar magnet 51 is provided. The interpole magnet 51 of the present embodiment is formed in a substantially sector shape when viewed from the axial direction, and its radially inner surface is a flat surface, and the straight portions of the flat surface viewed from the axial direction are the first and second cores. It is provided so that it may become a tangent of the outer peripheral surface of the bases 21 and 31. FIG.

  Here, as shown in FIG. 4, the field magnet 40 of the present embodiment has a non-contact portion for partially blocking the contact with the auxiliary magnet G (the back magnet 50 and the interpole magnet 51). H is formed. In the field magnet 40 of this embodiment, the shape of the outer peripheral portion viewed from the axial direction is a polygon, and the side portion of the field magnet 40 viewed from the axial direction is the non-contact portion H. ing. Specifically, the field magnet 40 has the same shape as the number of magnetic poles in the outer peripheral portion viewed from the axial direction, and is a regular polygon having eight corners 40a in this embodiment, and is adjacent in the circumferential direction. The surfaces between the matching corners 40a are non-contact portions H, respectively. Further, the corner 40 a of the field magnet 40 is disposed at the center position in the circumferential direction of the interpole magnet 51. That is, the corner 40a of the field magnet 40 is disposed so as to be close to the center position of the linear portion of the plane on the radially inner side when viewed from the axial direction in the interpole magnet 51.

Next, the operation of the brushless motor M configured as described above will be described.
When a three-phase power supply voltage is applied to each phase winding 13u, 13v, 13w of the stator core 10 and a rotating magnetic field is generated in the stator 2, the rotor 4 fixed to the rotating shaft 3 disposed inside the stator 2 is provided. Is driven to rotate based on the rotating magnetic field.

  At this time, in the rotor 4, the leakage (short-circuit) magnetic flux of the portion is suppressed by the back magnet 50, and the leakage (short-circuit) magnetic flux of the portion is suppressed by the inter-pole magnet 51, so the rotating magnetic field of the stator 2 is highly efficient. It is driven to rotate.

Next, the characteristic effects of the above embodiment will be described below.
(1) Since the field magnet 40 is formed with a non-contact portion H for partially blocking the contact with the auxiliary magnet G (the back magnet 50 and the interpole magnet 51), the field magnet 40 Can be partially separated from the auxiliary magnet G (the back magnet 50 or the interpole magnet 51), and the auxiliary magnet G is reduced from being demagnetized by the magnetic flux (short-circuit magnetic flux) of the field magnet 40. Can do. For example, when the auxiliary magnet G is magnetized in a state where each member is assembled, the auxiliary magnet G can be favorably magnetized by suppressing the reverse magnetic field applied by the field magnet 40 to the auxiliary magnet G. It becomes possible. For example, when the field magnet 40 is bonded to the first core base 21 or the second core base 31, excess adhesive can be caused to flow into the gap formed by the non-contact portion H. Therefore, for example, the brushless motor M can be stably made highly efficient.

  (2) Since the shape of the outer peripheral portion of the field magnet 40 viewed from the axial direction is a polygon, the side portion of the field magnet 40 viewed from the axial direction is the non-contact portion H. It is possible to reduce the demagnetization of the auxiliary magnet G due to the magnetic flux of the field magnet 40 with a simple configuration.

  (3) The shape of the outer peripheral portion of the field magnet 40 viewed from the axial direction is the same as the number of magnetic poles, and in this embodiment is a regular polygon having eight corners 40a. Thus, the corner 40a can be brought close to the same circumferential position of each interpole magnet 51, and the magnetic poles can be provided in a balanced manner in the circumferential direction. Moreover, since it is a regular polygon, manufacture of the field magnet 40 becomes easy.

  (4) Since the corner 40a of the field magnet 40 is arranged at the center position in the circumferential direction of the inter-pole magnet 51, the back magnet 50 is separated from the field magnet 40 as much as possible. Demagnetization due to the magnetic flux of the field magnet 40 can be reduced. In addition, since the part close | similar to the field magnet 40 also becomes a part also in the interpole magnet 51, it can reduce demagnetizing by the magnetic flux of the field magnet 40 also in the interpole magnet 51. In addition, the magnetic poles can be provided in a more balanced manner in the circumferential direction.

The above embodiment may be modified as follows.
In the above embodiment, the corner 40a of the field magnet 40 is disposed at the center position in the circumferential direction of the interpole magnet 51. However, the present invention is not limited to this, and the corner 40a may be disposed at another position. .

  For example, as shown in FIG. 5, the corner 40 a of the field magnet 40 may be disposed at the circumferential center position of the back magnet 50. If it does in this way, the interpole magnet 51 will be separated as much as possible from the field magnet 40, and it can reduce that the interpole magnet 51 is mainly demagnetized by the magnetic flux of the field magnet 40. In addition, since the part which adjoins the field magnet 40 also becomes a part also in the back magnet 50, it can reduce that the back magnet 50 is demagnetized by the magnetic flux of the field magnet 40.

  In the above embodiment, the back magnet 50 and the interpole magnet 51 are provided separately, but the present invention is not limited to this, and the back magnet 50 and the interpole magnet 51 are as shown in FIGS. It is magnetized so as to have the same function, and is changed to a polar anisotropic magnet 62 as an auxiliary magnet in which a back magnet part 60 as a back magnet and an interpolar magnet part 61 as an interpole magnet are integrally formed. Also good. In this example, the corner 40 a of the field magnet 40 is disposed at the center position in the circumferential direction of the interpole magnet portion 61. In this way, the number of parts can be reduced as compared with the case where each is separated.

Further, as shown in FIG. 8, in the embodiment using the polar anisotropic magnet 62, the corner 40 a of the field magnet 40 may be arranged at the circumferential center position of the back magnet portion 60.
In the above embodiment, the number of magnetic poles (number of poles) is embodied as eight rotors 4, but the present invention is not limited to this and may be changed to a rotor having a different number of poles.

  For example, as shown in FIG. 9, the number of magnetic poles (number of poles) may be embodied as 10 rotors. Specifically, in the rotor of this example, five first claw-shaped magnetic poles 71 of the first rotor core 65 and five second claw-shaped magnetic poles 72 of the second rotor core 66 are provided, and the inner side (back surface) in the radial direction thereof. A back magnet 73 is provided, and an inter-pole magnet 74 is provided between each of these circumferential directions. Note that the auxiliary grooves 25 and 35 of the above embodiment are not formed in the first and second claw-shaped magnetic poles 71 and 72 of this example. The field magnet 75 has a regular polygonal shape in which the shape of the outer peripheral portion viewed from the axial direction is the same as the number of magnetic poles, and in this example has ten corners 75a and ten non-contact portions H. It is said that. The corner 75 a of the field magnet 75 is arranged at the center position in the circumferential direction of the back magnet 73. Even if it does in this way, the above-mentioned effect can be acquired. In this example, the radially inner end of the interpole magnet 74 is disposed radially outward from the radially inner end of the back magnet 73 (the outer peripheral surfaces of the first and second core bases 21 and 31). It is formed so that.

For example, as shown in FIG. 10, the corner 75 a of the field magnet 75 in the above-described another example (see FIG. 9) may be arranged at the circumferential center position of the interpole magnet 74.
Further, for example, as shown in FIG. 11, the back magnet 73 and the interpole magnet 74 in the other example (see FIG. 9) are magnetized so as to have the same function, and the back magnet portion 81 as a back magnet. The interpolar magnet portion 82 as the interpolar magnet may be changed to the polar anisotropic magnet 83 as the auxiliary magnet integrally formed. In this example, the radially inner end of the interpolar magnet portion 82 forms a circular shape together with the radially inner end of the back magnet portion 81.

  In the above embodiment, the shape of the outer peripheral portion of the field magnet 40 viewed from the axial direction is a regular polygon having eight corners 40a that is the same as the number of magnetic poles. You may change to

  For example, it may be changed as shown in FIG. That is, by making the shape of the outer peripheral portion of the field magnet 90 viewed from the axial direction into a star-shaped polygon having an angle 90a protruding outward in the radial direction as many as the number of magnetic poles (10 in this example), The recessed portion of the field magnet 90 viewed from the axial direction may be changed to a non-contact portion H. Even if it does in this way, it can reduce that the auxiliary magnet G demagnetizes with the magnetic flux of the field magnet 90 with a simple structure. In addition, the corners 90a are arranged at the same circumferential position of each interpole magnet 74, and the magnetic poles can be provided in a balanced manner in the circumferential direction.

  Further, in this example, an angle 90 a protruding outward in the radial direction of the field magnet 90 is disposed at the center position in the circumferential direction of the interpole magnet 74, and radially outward from the radially inner end of the back magnet 73. Is arranged. In this way, for example, the volume of the field magnet 90 can be made larger than that which is not arranged radially outward.

  Further, for example, it may be changed to a regular polygon field magnet having a different number of angles from the number of magnetic poles. For example, it may be changed to a regular polygon having two times the number of magnetic poles or a regular polygon having half the number of magnetic poles.

  In the above embodiment, the shape of the outer peripheral portion of the field magnet 40 viewed from the axial direction is a polygon, so that the side portion of the field magnet 40 viewed from the axial direction is the non-contact portion H. However, as long as a non-contact portion for partially blocking the mutual contact is formed in at least one of the field magnet and the auxiliary magnet, the configuration may be changed to another configuration.

  For example, you may change as shown in FIG.13, FIG.14, FIG.15 (a) and FIG.15 (b). In this example, the field magnet 75 in the other example (see FIG. 9) is changed to a field magnet 100 in which a non-contact portion H is formed in a part in the axial direction. In addition, since it is substantially the same as the said another example (refer FIG. 9) except the field magnet 100, the same code | symbol is attached | subjected about those similar members, and detailed description is abbreviate | omitted.

  The field magnet 100 of this example is generally formed in a disk shape, and the non-contact portion H is formed only at a position corresponding to the base end portions of the first and second claw-shaped magnetic poles 71 and 72. Specifically, the non-contact portion H is planarly chamfered at a position corresponding to the first claw-shaped magnetic pole 71 on the side facing the first rotor core 65 of the field magnet 100 (upper side in FIG. 14). On the side facing the second rotor core 66 of the field magnet 100 formed as a chamfered portion, a flat chamfered portion is formed at a position corresponding to the second claw-shaped magnetic pole 72.

  In this case, since the non-contact portion H is formed at a position corresponding to the base end portions of the first and second claw-shaped magnetic poles 71 and 72, the magnetic flux of the field magnet 100 is particularly increased by the auxiliary magnet G (particularly It is possible to alleviate the reverse magnetic field at the part that gives a large reverse magnetic field to the back magnet 73), and to suppress the demagnetization of the auxiliary magnet G at the part. That is, the occurrence of short-circuit magnetic flux due to the magnetic flux of the field magnet 100 can be considered at the position corresponding to the base end portions of the first and second claw-shaped magnetic poles 71 and 72 (the portion where the back magnet 73 is disposed). Thus, the formation of the gap K having a large magnetic resistance suppresses the generation of the short-circuit magnetic flux, and the demagnetization of the auxiliary magnet G (the back magnet 73) due to the short-circuit magnetic flux can be suppressed.

  Further, since the non-contact portion H is formed only at a position corresponding to the base end portions of the first and second claw-shaped magnetic poles 71 and 72, the magnet amount can be reduced by forming the non-contact portion H. While suppressing as much as possible, it is possible to suppress demagnetization at a portion that is particularly easily demagnetized.

Further, since the non-contact portion H is a chamfered portion, for example, compared to a non-contact portion or the like that is a stepped portion, it is possible to suppress cracking or chipping of the portion.
Further, for example, as shown in FIGS. 16 (a) and 16 (b), the field magnet 100 of the above-described another example (see FIGS. 13 to 15) is a non-chamfered portion that is chamfered in the entire circumferential direction. You may change to the field magnet 110 in which the contact part H was formed.

  Further, for example, as shown in FIGS. 17 and 18, the non-contact portion H is formed on the back magnet 121 of the auxiliary magnet G while the substantially disk-shaped field magnet 120 is not formed with the non-contact portion H. May be. The back magnet 121 of this example is formed in a substantially sector shape when viewed from the axial direction, and the non-contact portion H is formed only at a position corresponding to the base end portions of the first and second claw-shaped magnetic poles 71 and 72. . The non-contact portion H in this example is a chamfered portion that is chamfered into a curved surface that is curved along the curved shape of the back magnet 121, as shown in FIG. Even if it does in this way, the effect similar to the effect of the said another example (FIGS. 13-15) can be acquired.

  Further, for example, the non-contact portion H in the back magnet 121 of the above-described another example (see FIGS. 17 and 18) may be a chamfered portion that is chamfered in a planar shape as shown in FIG. As shown, it is good also as a chamfering part chamfered by R shape. For example, as shown in FIG. 21, the non-contact part H is good also as a level | step difference part.

Further, for example, as shown in FIG. 22, a non-contact portion H for partially blocking the mutual contact may be formed on both the field magnet 100 and the back magnet 121.
The technical idea that can be grasped from the above embodiment and other examples will be described below together with the effects thereof.

(B) the radially inner end of the front Kikyokukan magnets are located radially outwardly of the radially inner end of the rear magnet, the angle which protrudes outward in a radial direction of the field magnet, the poles together are arranged in the circumferential direction central position between the magnet, it wherein is located radially outwardly of the radially inner end of the rear magnet.

  According to this configuration, the radially inner end of the interpole magnet is disposed radially outside the radially inner end of the back magnet, and the angle of the field magnet projecting radially outward is the circumference of the interpole magnet. Since it is arrange | positioned in radial direction outer side than the radial direction inner side edge part of a back magnet while arrange | positioning at a direction center position, the volume of a field magnet can be enlarged rather than what is not arrange | positioned at radial direction outer side, for example.

  2 ... stator, 4 ... rotor, 20, 65 ... first rotor core, 21 ... first core base (core base), 22, 71 ... first claw-shaped magnetic pole (claw-shaped magnetic pole), 30, 66 ... second rotor core, 31 ... 2nd core base (core base), 32, 72 ... 2nd claw-shaped magnetic pole (claw-shaped magnetic pole), 40, 75, 90, 100, 110, 120 ... Field magnet, 40a, 75a ... Angle, 50, 73, 121 ... back magnet, 51, 74 ... interpole magnet, 60, 81 ... back magnet part (back magnet), 61, 82 ... interpole magnet part (interpole magnet), 90a ... angle projecting radially outward , G ... auxiliary magnet, H ... non-contact part.

Claims (10)

A plurality of claw-shaped magnetic poles projecting radially outward and extending in the axial direction at equal intervals on the outer periphery of the core base, and the claw-shaped magnetic poles alternately in the circumferential direction while facing each other's core base Disposed first and second rotor cores;
The claw-shaped magnetic poles of the first rotor core function as the first magnetic poles by being arranged between the axial directions of the core bases and magnetized in the axial direction, and the claw-shaped magnetic poles of the second rotor core are made to function as the first magnetic poles. A field magnet that functions as a second magnetic pole;
In order to suppress the leakage magnetic flux between the back magnet disposed between the claw-shaped magnetic pole and the field magnet and between the back magnet for suppressing the leakage magnetic flux therebetween and the claw-shaped magnetic pole adjacent in the circumferential direction. A rotor provided with an auxiliary magnet composed of at least one of the interpolar magnets,
At least the field magnet of the field magnet and the auxiliary magnet is formed with a non-contact portion for partially blocking the mutual contact ,
The shape of the outer peripheral portion of the field magnet viewed from the axial direction is a polygon, and the side portion of the field magnet viewed from the axial direction is the non-contact portion. Rotor. The rotor according to claim 1 , wherein
A rotor characterized in that the shape of the outer peripheral portion of the field magnet viewed from the axial direction is a regular polygon having the same number of angles as the number of magnetic poles. The rotor according to claim 2 , wherein
The rotor according to claim 1, wherein the angle of the field magnet is arranged at a central position in the circumferential direction of the interpole magnet. The rotor according to claim 2 , wherein
The rotor, wherein the corner of the field magnet is arranged at a center position in the circumferential direction of the back magnet. A plurality of claw-shaped magnetic poles projecting radially outward and extending in the axial direction at equal intervals on the outer periphery of the core base, and the claw-shaped magnetic poles alternately in the circumferential direction while facing each other's core base Disposed first and second rotor cores;
The claw-shaped magnetic poles of the first rotor core function as the first magnetic poles by being arranged between the axial directions of the core bases and magnetized in the axial direction, and the claw-shaped magnetic poles of the second rotor core are made to function as the first magnetic poles. A field magnet that functions as a second magnetic pole;
In order to suppress the leakage magnetic flux between the back magnet disposed between the claw-shaped magnetic pole and the field magnet and between the back magnet for suppressing the leakage magnetic flux therebetween and the claw-shaped magnetic pole adjacent in the circumferential direction. An auxiliary magnet comprising at least one of
A rotor with
At least one of the field magnet and the auxiliary magnet is formed with a non-contact portion for partially blocking the mutual contact,
The non-contact portion is formed in a part of the axial direction,
The non-contact portion is formed at a position corresponding to a base end portion of the claw-shaped magnetic pole. The rotor according to claim 5 , wherein
The rotor, wherein the non-contact portion is formed only at a position corresponding to a base end portion of the claw-shaped magnetic pole. The rotor according to claim 5 or 6 ,
The non-contact portion is a chamfered portion. A plurality of claw-shaped magnetic poles projecting radially outward and extending in the axial direction at equal intervals on the outer periphery of the core base, and the claw-shaped magnetic poles alternately in the circumferential direction while facing each other's core base Disposed first and second rotor cores;
The claw-shaped magnetic poles of the first rotor core function as the first magnetic poles by being arranged between the axial directions of the core bases and magnetized in the axial direction, and the claw-shaped magnetic poles of the second rotor core are made to function as the first magnetic poles. A field magnet that functions as a second magnetic pole;
In order to suppress the leakage magnetic flux between the back magnet disposed between the claw-shaped magnetic pole and the field magnet and between the back magnet for suppressing the leakage magnetic flux therebetween and the claw-shaped magnetic pole adjacent in the circumferential direction. An auxiliary magnet comprising at least one of
A rotor with
At least the field magnet of the field magnet and the auxiliary magnet is formed with a non-contact portion for partially blocking the mutual contact,
The shape of the outer peripheral portion of the field magnet viewed from the axial direction is a star-shaped polygon having the same number of poles as the number of magnetic poles protruding outward in the radial direction, so that the field magnet viewed from the axial direction A rotor, wherein a recessed portion is the non-contact portion. The rotor according to any one of claims 1 to 8 ,
The back magnet and the interpole magnet are integrally molded to constitute the auxiliary magnet. The rotor according to any one of claims 1 to 9 ,
A motor comprising a stator that generates a rotating magnetic field.