JP5848097B2 - Rotor and motor - Google Patents

Description

  The present invention relates to a rotor and a motor.

  The rotor used in the motor includes two rotor cores combined with each other having a plurality of claw-shaped magnetic poles in the circumferential direction, and a field magnet arranged between them, and each claw-shaped magnetic pole is alternately arranged. There is a so-called permanent magnet field rotor-type rotor that allows different magnetic poles to function (see, for example, Patent Document 1).

  And in the rotor of patent document 1, the leakage flux in a rotor is reduced because the back side auxiliary magnet adheres to the surface inside the radial direction of a claw-shaped magnetic pole.

Japanese Utility Model Publication No. 5-43749

  However, in the rotor as described above, although the leakage flux is reduced by the back auxiliary magnet, when it is commercialized, further reduction of the leakage flux is required in order to achieve higher efficiency and higher output.

  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 that can stably reduce the leakage magnetic flux.

According to the first aspect of the present invention, a plurality of claw-shaped magnetic poles protrude radially outward at equal intervals on the outer periphery of the substantially disk-shaped core base, and extend in the axial direction. The first and second rotor cores in which the claw-shaped magnetic poles are alternately arranged in the circumferential direction while the bases are opposed to each other are arranged between the axial directions of the core bases, and are magnetized in the axial direction. A field magnet that causes the claw-shaped magnetic pole of the rotor core to function as a first magnetic pole and the claw-shaped magnetic pole of the second rotor core to function as a second magnetic pole, and a radial direction provided radially inward of the claw-shaped magnetic pole a rotor with a magnetized back auxiliary magnet comprises a circumferential inter-pole magnet magnetized in the circumferential direction is provided between each of between the claw-shaped magnetic poles, in the claw-like magnetic poles, the Radial direction to regulate the movement of the interpolar magnet radially outward Engaging portion for engagement is formed, the electrode between the magnets is directed to subject matter that the circumferential end face is provided so as to be in contact with the circumferential end surface of the rear auxiliary magnets.

According to this configuration, since the interpole magnets magnetized in the circumferential direction are provided between the claw-shaped magnetic poles in the circumferential direction, the leakage magnetic flux between the first claw-shaped magnetic pole and the second claw-shaped magnetic pole is reduced. be able to. Also, the claw-shaped magnetic poles, since the engaging portion engaged radially so as to restrict the radially outward movement of the machining gap magnet is formed, for example, without particularly providing a separate member, the machining gap It is possible to prevent the magnet from jumping out in the radial direction. Therefore, it is possible to further reduce the leakage magnetic flux stably, and to achieve high efficiency and high output stably.

  According to a second aspect of the present invention, in the rotor according to the first aspect, the claw-shaped magnetic poles are provided at a protruding portion that protrudes radially outward from an outer peripheral portion of the core base, and a tip portion of the protruding portion. A claw portion extending in the axial direction, and the claw portion is formed with a circumferential extension portion extending in a circumferential direction with respect to a tip end of the protruding portion, and the engaging portion is formed in the circumferential extension portion. The gist is to include the radially inner side surface.

  According to this configuration, the claw-shaped magnetic pole has a protruding portion that protrudes radially outward from the outer peripheral portion of the core base, and a claw portion that is provided at the tip of the protruding portion and extends in the axial direction. The claw portion is formed with a circumferentially extending portion extending in the circumferential direction from the tip of the protruding portion, and the engaging portion includes the radially inner surface of the circumferentially extending portion. It is possible to prevent the interpole magnet from protruding outward in the radial direction.

  According to a third aspect of the present invention, in the rotor according to the second aspect, the circumferential end surface of the back auxiliary magnet is flush with the circumferential end surface of the protruding portion, and the interpolar magnet is arranged in the circumferential direction. The gist is that the end surface is provided so as to abut on the projecting portion and the circumferential end surface of the back auxiliary magnet.

  According to the same configuration, the circumferential end surface of the back auxiliary magnet is flush with the circumferential end surface of the protruding portion, and the interpolar magnet is in contact with the protruding end portion and the circumferential end surface of the back auxiliary magnet. Therefore, the leakage magnetic flux can be reduced satisfactorily without making the circumferential end face of the interpole magnet particularly complicated (with a simple plane).

  According to a fourth aspect of the present invention, in the rotor according to the second or third aspect, the interpole magnet includes an inner interpole magnet portion provided between the protrusions in the circumferential direction, and the claw portions. The gist is to have an outer interpole magnet portion provided between the circumferential directions.

  According to the same configuration, the interpole magnet has an inner interpole magnet portion provided between the protrusions in the circumferential direction and an outer interpole magnet portion provided between the claw portions in the circumferential direction. For example, it is possible to reduce the leakage magnetic flux satisfactorily by providing a larger number of interpole magnets as compared with those having no outer interpole magnet portion.

  According to a fifth aspect of the present invention, in the rotor according to the fourth aspect, the radially inner side surface of the circumferentially extending portion is directed radially outward toward the circumferential tip of the circumferentially extending portion. The gist is that the claws are inclined.

  According to this configuration, the radially inner side surface (engagement portion) of the circumferentially extending portion is a claw inclined surface that is directed radially outward as it goes toward the circumferential tip of the circumferentially extending portion. In addition, the outer side between the circumferential directions of the claw parts (claw part inclined surfaces) while making the shape between the magnets difficult to break (for example, the inner angle of the interpolar magnet around the claw part inclined surface when viewed from the axial direction is obtuse) An interpolar magnet part can be provided.

  According to a sixth aspect of the present invention, in the rotor according to the fifth aspect, the outer inter-pole magnet bulges radially outward from the claw inclined surface, and the amount of bulging is in the claw-shaped magnetic pole. The gist is to have a bulging portion that is set to be equal to or less than the distance from the axial center of the radially outer end.

  According to this configuration, the outer interpole magnet bulges radially outward from the claw inclined surface, and the bulging amount is equal to or less than the distance from the axial center of the radially outer end of the claw-shaped magnetic pole. Since it has the set bulging part, compared with what does not have a bulging part, for example, many interpole magnets can be provided and leakage magnetic flux can be reduced favorably. Since the bulging amount of the bulging portion is set to be equal to or less than the distance from the axial center of the radially outer end of the claw-shaped magnetic pole, the bulging portion may protrude radially outward from the claw-shaped magnetic pole. For example, the bulging portion does not widen the air gap with the stator provided on the radially outer side of the rotor.

According to the seventh aspect of the present invention, a plurality of claw-shaped magnetic poles are protruded outward in the radial direction at equal intervals on the outer periphery of the substantially disk-shaped core base, and are formed to extend in the axial direction. The first and second rotor cores in which the claw-shaped magnetic poles are alternately arranged in the circumferential direction while the bases are opposed to each other are arranged between the axial directions of the core bases, and are magnetized in the axial direction. A field magnet that causes the claw-shaped magnetic pole of the rotor core to function as a first magnetic pole and the claw-shaped magnetic pole of the second rotor core to function as a second magnetic pole, and a radial direction provided radially inward of the claw-shaped magnetic pole And a back auxiliary magnet magnetized in the circumferential direction between the claw-shaped magnetic poles provided between the claw-shaped magnetic poles and magnetized in the circumferential direction, the back auxiliary magnet, or Both the claw-shaped magnetic pole and the back auxiliary magnet Formed engagement portion to be engaged in a radial direction so as to restrict the radially outward movement of the machining gap magnets, the engaging portion is the straight line in the radial direction outwardly as radially protruding circumferential direction Thus, the gist is to include a back inclined surface that is an end surface in the circumferential direction of the back auxiliary magnet inclined with respect to the straight line.

According to this configuration, since the interpole magnets magnetized in the circumferential direction are provided between the claw-shaped magnetic poles in the circumferential direction, the leakage magnetic flux between the first claw-shaped magnetic pole and the second claw-shaped magnetic pole is reduced. be able to. Also, since the back auxiliary magnet, or both the claw-shaped magnetic pole and the back auxiliary magnet, are formed with engaging portions that engage in the radial direction so as to restrict the movement of the interpole magnets radially outward, In addition, it is possible to prevent the interpole magnet from protruding outward in the radial direction without providing a separate member. Therefore, it is possible to further reduce the leakage magnetic flux stably, and to achieve high efficiency and high output stably.
Further, since the engaging portion includes a back inclined surface that is a circumferential end surface of the back auxiliary magnet inclined with respect to the straight line so as to protrude in the circumferential direction from the straight line along the radial direction toward the radially outer side, It is possible to prevent the interpole magnet from jumping out in the radial direction on the back inclined surface.

  According to an eighth aspect of the present invention, in the rotor according to the seventh aspect, the claw-shaped magnetic pole includes a protruding portion protruding radially outward from the outer peripheral portion of the core base, and a shaft provided at a tip of the protruding portion. And a circumferential end surface of at least one of the projecting portion and the claw portion is flush with the back inclined surface and constitutes a part of the engaging portion. To do.

  According to this configuration, the claw-shaped magnetic pole has a protruding portion that protrudes radially outward from the outer peripheral portion of the core base, and a claw portion that is provided at the tip of the protruding portion and extends in the axial direction. In addition, since at least one circumferential end surface of the projecting portion and the claw portion is flush with the back inclined surface and constitutes a part of the engaging portion, the projecting portion and the claw portion have at least one circumferential end surface. In addition, it is possible to prevent the interpole magnet from jumping outward in the radial direction.

  According to a ninth aspect of the present invention, in the rotor according to the seventh aspect, the circumferential end surface of the claw-shaped magnetic pole is formed so as to be disposed on the inner side in the circumferential direction with respect to the rear inclined surface. To do.

  According to this configuration, the circumferential end surface of the claw-shaped magnetic pole is formed so as to be disposed on the inner side in the circumferential direction with respect to the back inclined surface, so that the circumferential end surface of the interpole magnet has a particularly complicated shape. Without (simple plane), the interpole magnet and the claw-shaped magnetic pole can be separated. Thereby, the influence of the local reverse magnetic field from the claw-shaped magnetic pole to the interpole magnet can be avoided, and demagnetization of the interpole magnet can be suppressed.

The invention according to claim 10 is summarized as a motor including the rotor according to any one of claims 1 to 9.
According to this configuration, the effect of the invention according to any one of claims 1 to 9 can be obtained in the motor.

  ADVANTAGE OF THE INVENTION According to this invention, the rotor and motor which can reduce a leakage magnetic flux stably can be provided.

Sectional drawing of the motor in one Embodiment. (A) (b) The perspective view of the rotor in one Embodiment. The partial top view of the rotor in one Embodiment. Sectional drawing of the rotor in one Embodiment. The partial top view of the rotor in another example. The partial top view of the rotor in another example. The partial top view of the rotor in another example. The partial top view of the rotor in another example. The partial top view of the rotor in another example. The partial top view of the rotor in another example. The partial top view of the rotor in another example. The partial top view of the rotor in another example.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
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 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.

  2 to 4, the rotor 11 includes first and second rotor cores 21 and 22, an annular magnet 23 (see FIG. 4) as a field magnet, and first and second back magnets. Back auxiliary magnets 24 and 25 (see FIGS. 2 and 4) and first and second interpole magnets 26 and 27 (see FIG. 2) as interpole magnets are provided.

  The first rotor core 21 has a plurality of first claw-shaped magnetic poles 21b as claw-shaped magnetic poles (five in the present embodiment) at equal intervals on the outer periphery of the first core base 21a as a substantially disk-shaped core base. It protrudes radially outward and extends in the axial direction. Specifically, the first claw-shaped magnetic pole 21b has a protrusion 21c that protrudes radially outward from the outer periphery of the first core base 21a, and a claw 21d that is provided at the tip of the protrusion 21c and extends in the axial direction. . As shown in FIG. 3, the protruding portion 21 c is formed in a fan shape when viewed from the axial direction. The claw portion 21d is formed with a circumferentially extending portion 21e extending in the circumferential direction from the tip of the protruding portion 21c. In other words, the angle L1 corresponding to the circumferential width of the claw portion 21d (centered on the axial center Z) is greater than the angle L2 corresponding to the circumferential width of the protruding portion 21c (centered on the axial center Z). Is also set larger. And in this embodiment, the radial direction inner surface 21f in the circumferential direction extension part 21e of the nail | claw part 21d comprises the engaging part. Further, the claw portion 21d has a fan-shaped cross section in the direction perpendicular to the axis, and is formed in a rectangular shape when viewed from the outside in the radial direction. Further, the length in the radial direction of the claw portion 21d of the present embodiment is set to about half of the length in the radial direction of the protruding portion 21c.

  The second rotor core 22 has the same shape as the first rotor core 21, and a plurality of second rotor cores 22 are arranged at equal intervals on the outer periphery of a second core base 22a (see FIG. 2B) as a substantially disk-shaped core base. Second claw-shaped magnetic poles 22b (five in the present embodiment) as claw-shaped magnetic poles protrude radially outward and extend in the axial direction. Specifically, the second claw-shaped magnetic pole 22b has a protrusion 22c that protrudes radially outward from the outer periphery of the second core base 22a, and a claw 22d that is provided at the tip of the protrusion 22c and extends in the axial direction. . The protrusion 22 c is formed in a fan shape when viewed from the axial direction, similarly to the protrusion 21 c of the first rotor core 21. Similarly to the claw portion 21d of the first rotor core 21, the claw portion 22d is formed with a circumferentially extending portion 22e extending in the circumferential direction from the tip of the protruding portion 22c. In other words, the angle L1 (centered around the axis center Z) corresponding to the circumferential width of the claw portion 22d is greater than the angle L2 (centered about the axis center Z) corresponding to the circumferential width of the protrusion 22c. Is also set larger. In the present embodiment, the radially inner side surface 22f of the circumferentially extending portion 22e of the claw portion 22d constitutes the engaging portion. Further, the claw portion 22d has a fan-shaped cross section in the direction perpendicular to the axis, and is formed in a rectangular shape when viewed from the outside in the radial direction. Further, the length in the radial direction of the claw portion 22d of the present embodiment is set to about half of the length in the radial direction of the protruding portion 22c. The second rotor core 22 is disposed between the first claw-shaped magnetic poles 21b corresponding to the second claw-shaped magnetic poles 22b (that is, alternately in the circumferential direction with the first claw-shaped magnetic poles 21b). As shown in FIG. 4, the annular magnet 23 is assembled (attached) to the first rotor core 21 so as to be disposed (sandwiched) between the axial directions of the first core base 21a and the second core base 22a facing each other. At this time, a rectangular groove is formed between the first claw-shaped magnetic pole 21b and the second claw-shaped magnetic pole 22b in the circumferential direction when viewed from the outside in the radial direction.

  The outer diameter of the annular magnet 23 is set to be the same as the outer diameters of the first and second core bases 21a and 22a, and the first claw-shaped magnetic pole 21b functions as the first magnetic pole (N pole in 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 this embodiment).

  Further, as shown in FIGS. 2B and 4, there is a gap between the back surface (radially inner surface) of each first claw-shaped magnetic pole 21b (claw portion 21d) and the outer peripheral surface of the second core base 22a. The 1st back auxiliary magnet 24 is arranged. The first back auxiliary magnet 24 has a substantially rectangular parallelepiped shape in which the cross section in the axis-perpendicular direction is fan-shaped, and abuts against the back surface of the first claw-shaped magnetic pole 21b (claw portion 21d) in order to reduce leakage magnetic flux at that portion. It is magnetized in the radial direction so that the side is the N pole having the same polarity as the first claw-shaped magnetic pole 21b and the side abutting on the second core base 22a is the S pole having the same polarity as the second core base 22a. Further, the circumferential end surface of the first back auxiliary magnet 24 is flush with the circumferential end surface of the protruding portion 21c. That is, the angle L3 (centered on the axis center Z) corresponding to the circumferential width of the first back auxiliary magnet 24 is an angle (centered on the axis center Z) corresponding to the circumferential width of the protrusion 21c. It is set to be the same as L2 (see FIG. 3).

  Further, as shown in FIGS. 2A and 4, there is a gap between the back surface (radially inner surface) of each second claw-shaped magnetic pole 22b (claw portion 22d) and the outer peripheral surface of the first core base 21a. The second back auxiliary magnet 25 is arranged. The second back auxiliary magnet 25 has a substantially rectangular parallelepiped shape with a cross section perpendicular to the axis, and abuts against the back surface of the second claw-shaped magnetic pole 22b (claw portion 22d) in order to reduce leakage magnetic flux at that portion. The side is magnetized in the radial direction so that the S pole having the same polarity as the second claw-shaped magnetic pole 22b and the side contacting the first core base 21a become the N pole having the same polarity as the first core base 21a. The circumferential end surface of the second back auxiliary magnet 25 is flush with the circumferential end surface of the protruding portion 22c. That is, the angle L3 (centered on the axis center Z) corresponding to the circumferential width of the second back auxiliary magnet 25 is an angle (centered on the axis center Z) corresponding to the circumferential width of the protrusion 22c. It is set to be the same as L2 (see FIG. 3).

  Further, as shown in FIG. 4, the first back auxiliary magnet 24 and the second back auxiliary magnet 25 overlap each other in the axial direction at the axial position where the annular magnet 23 is arranged. It is set so as to be arranged also at the arranged axial position.

  And between the circumferential direction of the 1st claw-shaped magnetic pole 21b and the 2nd claw-shaped magnetic pole 22b, the 1st and 2nd interpole magnets 26 and 27 are arrange | positioned. Specifically, the axial lengths of the first and second interpole magnets 26 and 27 of the present embodiment are set to be the same as the axial lengths of the first and second claw-shaped magnetic poles 21b and 22b. Further, the first and second interpole magnets 26 and 27 include inner interpole magnet portions 26a and 26a provided between the projecting portions 21c and 22c (first and second back auxiliary magnets 24 and 25), respectively. 27a and outer interpole magnet portions 26b and 27b provided between the claw portions 21d and 22d in the circumferential direction. The inner interpole magnet portions 26a and 27a have a substantially rectangular parallelepiped shape in which the cross section in the direction perpendicular to the axis is a fan shape, and the circumferential end surfaces thereof are the circumferences of the protruding portions 21c and 22c and the first and second back auxiliary magnets 24 and 25. It is set to abut (surface contact) with the direction end face. The outer interpole magnet portions 26b, 27b are provided at the center of the radially outer surface of the inner interpole magnet portions 26a, 27a, have a substantially rectangular parallelepiped shape with a cross-section perpendicular to the axis, and have circumferential end faces. The claw portions 21d and 22d are set so as to come into contact (surface contact) with the circumferential end surfaces. Further, both ends of the radially outer side surfaces of the inner interpole magnet portions 26a and 27a are in the radial direction with the radially inner side surfaces 21f and 22f (engaging portions) of the circumferentially extending portions 21e and 22e of the claw portions 21d and 22d. It is set to engage (abut).

  The first and second interpole magnets 26 and 27 have the same magnetic pole as that of the first and second claw-shaped magnetic poles 21b and 22b (the first claw-shaped magnetic pole 21b side is the N pole, and the second claw-shaped magnet It is magnetized in the circumferential direction (so that the magnetic pole 22b side becomes the S pole).

Next, the operation of the motor 1 configured as described above will be described.
In the rotor 11, the first and second back auxiliary magnets 24, 25 and the first and second interpole magnets 26, 27 are provided, so that the leakage magnetic flux is reduced at the respective arrangement locations, and the annular magnet 23 is eventually formed. Can be effectively used for the output of the motor 1. Further, a large centrifugal force is applied to the first and second interpole magnets 26 and 27 when the rotor 11 rotates, but the engaging portions (the radially inner side surfaces 21f and 22f in the circumferentially extending portions 21e and 22e) have a diameter. By engaging in the direction, the first and second interpole magnets 26 and 27 are prevented from protruding outward in the radial direction.

Next, the characteristic effects of the above embodiment will be described below.
(1) Since the first and second back auxiliary magnets 24 and 25 magnetized in the radial direction are provided on the radially inner sides of the first and second claw-shaped magnetic poles 21b and 22b (claw portions 21d and 22d), The leakage magnetic flux (in the radial direction) at that portion can be reduced. Further, since the first and second interpole magnets 26 and 27 magnetized in the circumferential direction are provided between the first and second claw-shaped magnetic poles 21b and 22b in the circumferential direction, ) Leakage magnetic flux can be reduced. Further, the first and second claw-shaped magnetic poles 21b and 22b have engaging portions (circumferential directions) engaged in the radial direction so as to restrict the outward movement of the first and second interpole magnets 26 and 27 in the radial direction. The radially inner side surfaces 21f and 22f) of the extending portions 21e and 22e are formed. Accordingly, for example, the radial direction of the first and second interpole magnets 26 and 27 at the engaging portion (the radially inner side surfaces 21f and 22f in the circumferentially extending portions 21e and 22e) without particularly providing another member. Jumping out to the outside can be prevented. Therefore, it is possible to further reduce the leakage magnetic flux stably, and to achieve high efficiency and high output stably.

  (2) The circumferential end faces of the first and second back auxiliary magnets 24, 25 are flush with the circumferential end faces of the protruding portions 21c, 22c, and the first and second interpole magnets 26, 27 (between the inner poles) The magnet portions 26a, 27a) are provided such that their circumferential end surfaces are in contact (surface contact) with the projecting portions 21c, 22c and the circumferential end surfaces of the first and second back auxiliary magnets 24, 25. Therefore, the leakage magnetic flux can be reduced well without making the circumferential end faces of the first and second interpole magnets 26 and 27 particularly complicated (with a simple plane).

  (3) The first and second interpole magnets 26 and 27 are arranged in the circumferential direction between the inner interpole magnet portions 26a and 27a provided between the projecting portions 21c and 22c and the claw portions 21d and 22d. And outer inter-pole magnet portions 26b and 27b provided therebetween. Therefore, for example, more magnetic poles (first and second magnetic poles 26 and 27) are provided to reduce the leakage magnetic flux better than those without the outer magnetic pole portions 26b and 27b. Can do.

The above embodiment may be modified as follows.
In the above embodiment, the protruding portions 21c and 22c and the claw portions 21d and 22d of the first and second claw-shaped magnetic poles 21b and 22b are formed in a fan shape when viewed from the axial direction, and their respective circumferential end faces are rotors. However, the present invention is not limited to this, and the shape may be changed as shown in FIGS. 5 and 6, for example.

  That is, in another example shown in FIG. 5 and FIG. 6, a straight line (radial direction) in which the circumferential end surfaces of the claw portions 21 d and 22 d of the first and second claw-shaped magnetic poles 21 b and 22 b pass through the axial center Z of the rotor 11. With respect to the straight line. In other words, the claw portions 21d and 22d are formed such that the circumferential width is constant in the radial direction.

  Further, in another example shown in FIG. 5, both end surfaces in the circumferential direction of the projecting portions 21c and 22c (only the projecting portion 21c is shown in FIG. 5) of the first and second claw-shaped magnetic poles 21b and 22b are centered on the axis of the rotor 11. It is symmetric with respect to a straight line (diameter direction) passing through Z, and is formed parallel to the straight line. In other words, the protrusions 21c and 22c (only the protrusion 21c is shown in FIG. 5) have a circumferential width that is constant in the radial direction. In this example (see FIG. 5), the cross-sectional area of the cross section perpendicular to the radial direction is constant in each part, that is, the magnetic resistance is constant.

  In another example shown in FIG. 6, both end surfaces in the circumferential direction of the projecting portions 21 c and 22 c (only the projecting portion 21 c is shown in FIG. 6) of the first and second claw-shaped magnetic poles 21 b and 22 b are centered on the axis of the rotor 11. It is symmetrical with respect to a straight line (diameter direction) passing through Z, and the width in the circumferential direction of the projecting portions 21c, 22c is formed wider toward the inner side in the radial direction. In this example (see FIG. 6), the strength of the first and second claw-shaped magnetic poles 21b and 22b on the base side (in the radial direction) is improved, and the claw portions 21d and 22d are stabilized against rotation.

  In these examples (see FIGS. 5 and 6), the first and second back auxiliary magnets 24 and 25 (only the second back auxiliary magnet 25 is shown in FIGS. 5 and 6) and the first and second poles. The shape of the intermediate magnets 26 and 27 is changed to a shape corresponding to the first and second claw-shaped magnetic poles 21b and 22b (protruding portions 21c and 22c and claw portions 21d and 22d).

  In the above embodiment, the length in the radial direction of the claw portions 21d and 22d is set to about half of the length in the radial direction of the projecting portions 21c and 22c. As shown in FIG. 7, the length may be changed to a length (for example, about 1/6) that is less than half of the radial length of the protrusions 21 c and 22 c and significantly shorter than half. In this example, for example, the first and second claw-shaped magnetic poles 21b and 22b can be easily formed by bending a plate material.

  In the above embodiment, the claws 21d and 22d have a fan-shaped cross section in the direction perpendicular to the axis, and the radially inner side surfaces 21f and 22f (engagement portions) of the circumferentially extending portions 21e and 22e are centered on the axis center Z. However, the present invention is not limited to this, and for example, it may be changed as shown in FIG. That is, in this example (see FIG. 8), the radially inner side surfaces (engaging portions) of the circumferentially extending portions 21e and 22e of the claw portions 21d and 22d are the distal ends of the circumferentially extending portions 21e and 22e in the circumferential direction. It is set as the claw part inclined surfaces 21g and 22g which go to a radial direction outer side, so that it goes to a part. In this example, the cross section in the direction perpendicular to the axis is such that the outer interpole magnet portions 26b, 27b of the first and second interpole magnets 26, 27 are in contact (surface contact) with the claw inclined surfaces 21g, 22g. Has a substantially trapezoidal shape. In this way, the first and second interpolar magnets 26 and 27 are shaped so as not to be damaged (for example, the inner angles around the claw inclined surfaces 21g and 22g are obtuse as viewed from the axial direction), and the claw portions 21d and 22d ( The outer interpole magnet portions 26b and 27b can be provided between the circumferential directions of the claw portion inclined surfaces 21g and 22g).

  Further, in this example (see FIG. 8), the outer interpole magnet portions 26b and 27b are shaped to the same radial position as the radially outer ends of the claw inclined surfaces 21g and 22g, but as shown in FIG. Moreover, the outer interpole magnet portions 26b and 27b may have bulging portions 26c and 27c that bulge radially outward from the claw inclined surfaces 21g and 22g. The bulging amount of the bulging portions 26c and 27c is set to be equal to or less than the distance from the axial center Z of the radially outer end portions of the first and second claw-shaped magnetic poles 21b and 22b. In this way, more interpole magnets (first and second interpole magnets 26 and 27) are provided and better than the above-described another example (see FIG. 8) that does not have the bulging portions 26c and 27c. Leakage magnetic flux can be reduced. Since the bulging amounts of the bulging portions 26c and 27c are set to be equal to or less than the distance from the axial center Z of the radially outer ends of the first and second claw-shaped magnetic poles 21b and 22b, 27c does not protrude radially outward from the first and second claw-shaped magnetic poles 21b and 22b. Therefore, for example, the bulging portions 26 c and 27 c do not widen the air gap with the stator 6 provided on the radially outer side of the rotor 11. In this example (see FIG. 8), the bulging portions 26c, 27c and the first and second claw-shaped magnetic poles 21b, 22b (claw portions 21d, 22d) can be separated from each other. The influence of a local reverse magnetic field on 27c can be avoided, and demagnetization of the bulging portions 26c and 27c (first and second interpole magnets 26 and 27) can be suppressed.

  In the above embodiment, the first and second engaging portions (the radially inner side surfaces 21f and 22f in the circumferentially extending portions 21e and 22e) that are engaged with the first and second interpole magnets 26 and 27 in the radial direction are the first and second. Although formed on the two-claw-shaped magnetic poles 21b, 22b, if it is formed on at least one of the first and second claw-shaped magnetic poles 21b, 22b and the first and second back auxiliary magnets 24, 25, the configuration can be changed to another configuration. Also good.

  For example, it may be changed as shown in FIG. In this example (see FIG. 10), the circumferential end surfaces of the first and second back auxiliary magnets 24 and 25 (only the second back auxiliary magnet 25 is shown in FIG. 10) are linear X along the radial direction toward the outer side in the radial direction. The back inclined surface 25a is inclined with respect to the straight line X so as to protrude in the circumferential direction from the (straight line passing through the axial center Z of the rotor 11), and the back inclined surface 25a is an engaging portion. In other words, in this example (see FIG. 10), the circumferential end surfaces of the first and second back auxiliary magnets 24 and 25 (only the second back auxiliary magnet 25 is shown in FIG. 10) are from the axial center Z of the rotor 11. Also, the rear inclined surface 25a (engagement portion) is formed so as to coincide with the fan-shaped circumferential end surface with the radially outer side as the axial center Za. In this example (see FIG. 10), the circumferentially extending portions 21e and 22e are not formed on the claw portions 21d and 22d. And the protrusion part 21c, 22c (only one protrusion part 21c is shown in FIG. 10) of this example (refer FIG. 10 only) and the circumferential direction end surface of claw part 21d, 22d are flush | planar with the said back inclined surface 25a. (With the back inclined surface 25a) constitutes a part of the engaging portion. Further, the first and second interpole magnets 31 and 32 in this example (see FIG. 10) become narrower in the circumferential direction toward the radially outer side according to the back inclined surface 25a or the like (so as to come into surface contact). It is formed into a shape.

  In this way, it is possible to prevent the first and second interpole magnets 31 and 32 from protruding outward in the radial direction at the back inclined surface 25a. Further, the first and second interpole magnets 31 and 32 protrude outward in the radial direction also by the circumferential end surfaces of the first and second claw-shaped magnetic poles 21b and 22b (protruding portions 21c and 22c and claw portions 21d and 22d). Can be prevented.

  In this other example (see FIG. 10), the end faces in the circumferential direction of the first and second claw-shaped magnetic poles 21b and 22b are also configured as engaging portions. However, the present invention is not limited to this, for example, as shown in FIG. In addition, the circumferential end faces of the first and second claw-shaped magnetic poles 21b and 22b may be formed so as to be arranged on the inner side in the circumferential direction with respect to the back inclined surface 25a. Specifically, in this example (see FIG. 11), the end faces in the circumferential direction of the first and second claw-shaped magnetic poles 21b and 22b have an axial center Zb that is radially outside the axial center Za of the back inclined surface 25a. It is formed so as to coincide with the circumferential end surface of the shape, and is formed so as to be arranged on the inner side in the circumferential direction with respect to the back inclined surface 25a.

  In this way, the first and second interpole magnets 31 and 32 and the first interpole magnets 31 and 32 and the first interpole magnets 31 and 32 are not complicated in shape (with a simple plane). The first and second claw-shaped magnetic poles 21b and 22b can be separated from each other. Thereby, the influence of a local reverse magnetic field from the first and second claw-shaped magnetic poles 21b and 22b to the first and second interpole magnets 31 and 32 can be avoided, and the first and second interpole magnets 31 can be avoided. , 32 can be suppressed.

  Also in such another example (see FIG. 11), for example, as shown in FIG. 12, the length of the claw portions 21d and 22d in the radial direction is changed to the protruding portions 21c and 22c (one protrusion in FIG. 12). The length may be changed to a length (for example, about 1/6) that is less than half of the length in the radial direction of the portion 21c and significantly shorter than half. In this example, for example, the first and second claw-shaped magnetic poles 21b and 22b can be easily formed by bending a plate material.

  In the above embodiment, the first and second interpole magnets 26 and 27 have the inner interpole magnet portions 26a and 27a and the outer interpole magnet portions 26b and 27b. The outer interpole magnet portions 26b and 27b provided between the circumferential directions of 21d and 22d may not be provided (only the inner interpole magnet portions 26a and 27a).

The technical idea that can be grasped from the above embodiment will be described below together with the effects thereof.
(A) The rotor according to any one of claims 2 to 6, wherein the protruding portion is formed such that a circumferential width thereof is constant in a radial direction.

If it does in this way, the cross-sectional area of the cross section orthogonal to a radial direction in a protrusion part is constant, ie, magnetic resistance becomes constant.
(B) The rotor according to any one of claims 2 to 6, wherein the projecting portion is formed so as to increase in width in a circumferential direction toward a radially inner side.

  If it does in this way, the intensity | strength of the base side (diameter direction inner side) of a nail | claw-shaped magnetic pole will improve, and a nail | claw part will be stabilized with respect to rotation.

  DESCRIPTION OF SYMBOLS 11 ... Rotor, 21 ... 1st rotor core, 21a ... 1st core base (core base), 21b ... 1st claw-shaped magnetic pole (claw-shaped magnetic pole), 21c, 22c ... Projection part, 21d, 22d ... Claw part, 21e, 22e ... Circumferentially extending portion, 21f, 22f ... Radial inner side surface (engagement portion), 21g, 22g ... Claw portion inclined surface (engagement portion), 22 ... Second rotor core, 22a ... Second core base (core Base), 22b ... second claw-shaped magnetic pole (claw-shaped magnetic pole), 23 ... annular magnet (field magnet), 24 ... first back auxiliary magnet (back auxiliary magnet), 25 ... second back auxiliary magnet (back auxiliary magnet) ), 25a ... Back inclined surface, 26, 31 ... First interpole magnet (interpole magnet), 26a, 27a ... Inner interpole magnet portion, 26b, 27b ... Outer interpole magnet portion, 26c, 27c ... Swelling portion 27, 32 ... second interpole magnet (interpole magnet), X ... straight line, Z ... low The axial center of.

Claims (10)

A plurality of claw-shaped magnetic poles project radially outward and extend in the axial direction on the outer periphery of each substantially disk-shaped core base, and the claw-shaped magnetic poles are formed with the core bases facing each other. First and second rotor cores arranged alternately in the circumferential direction;
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;
A rotor provided with a back auxiliary magnet provided radially inside the claw-shaped magnetic pole and magnetized in the radial direction;
An interpole magnet provided between the claw-shaped magnetic poles in the circumferential direction and magnetized in the circumferential direction;
Wherein the claw-like magnetic poles, the engaging portion which engages in the radial direction so as to restrict the radially outward movement of the poles between the magnets is formed,
The rotor, wherein the interpolar magnet is provided such that a circumferential end surface thereof abuts on a circumferential end surface of the back auxiliary magnet . The rotor according to claim 1, wherein
The claw-shaped magnetic pole has a protrusion that protrudes radially outward from the outer periphery of the core base, and a claw that is provided at the tip of the protrusion and extends in the axial direction.
The claw portion is formed with a circumferentially extending portion extending in the circumferential direction from the tip of the protruding portion,
The rotor, wherein the engaging portion includes a radially inner side surface in the circumferentially extending portion. The rotor according to claim 2, wherein
The circumferential end surface of the back auxiliary magnet is flush with the circumferential end surface of the protrusion,
The rotor, wherein the interpolar magnet is provided so that a circumferential end surface thereof abuts on the projecting portion and a circumferential end surface of the back auxiliary magnet. The rotor according to claim 2 or 3,
The interpolar magnet includes an inner interpolar magnet portion provided between the protruding portions in the circumferential direction and an outer interpolar magnet portion provided between the claw portions in the circumferential direction. Rotor. The rotor according to claim 4, wherein
The rotor according to claim 1, wherein the radially inner side surface of the circumferentially extending portion is a claw inclined surface that faces the radially outer side toward the circumferential tip of the circumferentially extending portion. The rotor according to claim 5, wherein
The outer interpole magnet bulges radially outward from the claw inclined surface and the bulge amount is set to be equal to or less than the distance from the axial center of the radially outer end of the claw-shaped magnetic pole. A rotor having a portion. A plurality of claw-shaped magnetic poles project radially outward and extend in the axial direction on the outer periphery of each substantially disk-shaped core base, and the claw-shaped magnetic poles are formed with the core bases facing each other. First and second rotor cores arranged alternately in the circumferential direction;
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;
A back auxiliary magnet provided radially inside the claw-shaped magnetic pole and magnetized in the radial direction;
A rotor with
An interpole magnet provided between the claw-shaped magnetic poles in the circumferential direction and magnetized in the circumferential direction;
In the back auxiliary magnet, or both of the claw-shaped magnetic pole and the back auxiliary magnet, an engaging portion is formed that engages in the radial direction so as to restrict the movement of the interpole magnet to the outside in the radial direction.
The engaging portion includes a back inclined surface that is a circumferential end surface of the back auxiliary magnet that is inclined with respect to the straight line so as to protrude in the circumferential direction from the straight line along the radial direction toward the radially outer side. Rotor. The rotor according to claim 7, wherein
The claw-shaped magnetic pole has a protrusion that protrudes radially outward from the outer periphery of the core base, and a claw that is provided at the tip of the protrusion and extends in the axial direction.
At least one circumferential end surface of the projecting portion and the claw portion is flush with the back inclined surface to form a part of the engaging portion. The rotor according to claim 7, wherein
The rotor is characterized in that a circumferential end face of the claw-shaped magnetic pole is formed so as to be arranged on the inner side in the circumferential direction with respect to the back inclined surface.   A motor comprising the rotor according to claim 1.