JP2013099101A - Rotor and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor capable of increasing an effective magnetic flux.SOLUTION: First to fourth rotor cores 21 to 24 of a rotor 11 are disposed along an axial direction of a rotary shaft 12. The first to the fourth rotor cores 21 to 24 have claw-shaped magnetic poles 21b to 24b alternately arranged along a circumferential direction. Respective claw-shaped magnetic poles 21b to 24b are formed so as to extend toward mutually opposite directions along the axial direction. A triangular part as viewed in the axial direction, which is formed by both circumferential end faces of the first claw-shaped magnetic pole 21b and a radial inner side face 21f on both circumferential end faces of each first claw-shaped magnetic pole 21b, functions as a flux induction part for inducing a magnetic flux of an interpole magnet 31 to a radial outer side face 21e of the first claw-shaped magnetic pole 21b, that is, an end face of the first claw-shaped magnetic pole 21b facing a stator.

Description

  The present invention relates to a rotor and a motor.

  2. Description of the Related Art Conventionally, a plurality of pairs (for example, two pairs) of magnetic pole plates each having a plurality of flange portions in the circumferential direction are combined, and a permanent magnet having adjacent flange portions sandwiched by each pair of magnetic pole plates and having different magnetic poles. In addition, there is a so-called permanent magnet field Landell-type rotor (see, for example, Patent Document 1). Further, in this rotor, each pair of magnetic pole plates is arranged so that the disk portions having the same polarity are in contact with each other. For example, two disk parts that are N poles are disposed at both ends in the axial direction, and two disk parts that are S poles are adjacently disposed in the axial direction.

Japanese Utility Model Publication No. 5-43749

  Incidentally, in a motor including a rotor configured as described above, improvement in performance (for example, higher output) is required. For this reason, the rotor is required to increase the effective magnetic flux.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a rotor and a motor capable of increasing an effective magnetic flux.

In order to solve the above-mentioned problems, the invention according to claim 1 is formed so as to protrude from the outer peripheral portion of the disk-shaped core base and to extend along the axial direction toward the paired rotor core side. A plurality of claw-shaped magnetic poles arranged alternately along the at least one pair of rotor cores arranged in the axial direction, a field magnet arranged between the paired rotor cores and magnetized along the axial direction; A plurality of interpole magnets arranged between the claw-shaped magnetic poles adjacent to each other in the circumferential direction and magnetized so that the surfaces of the same polarity as the claw-shaped magnetic poles face each other, and the tips of the claw-shaped magnetic poles The part is formed with a magnetic flux guiding part for guiding the magnetic flux of the interpole magnet to the outer peripheral side surface of the claw-shaped magnetic pole.
A rotor characterized by that.
According to the present invention, the interpole magnet reduces the leakage magnetic flux between the claw-shaped magnetic poles that are adjacent to each other in the circumferential direction and function as different magnetic poles. And the magnetic flux guidance | induction part formed in the front-end | tip part of a claw-shaped magnetic pole guides the magnetic flux of an interpolar magnet to the outer peripheral side surface of a claw-shaped magnetic pole. Therefore, the magnetic flux on the outer peripheral side surface of the claw-shaped magnetic pole includes the magnetic flux of the field magnet and the magnetic flux of the interpole magnet, and the effective magnetic flux amount increases.

According to a second aspect of the present invention, in the rotor according to the first aspect, the magnetic flux guiding portion is formed by bringing the circumferential center of the radially inner side surface closer to the radially outer side surface than both circumferential sides. .
According to the present invention, a gap is formed between the radially inner side surface of the claw-shaped magnetic pole and the outer peripheral surface of the core base facing the side surface, and this gap causes leakage between the claw-shaped magnetic pole and the core base. Magnetic flux is reduced.

According to a third aspect of the present invention, in the rotor according to the second aspect, at least two pairs of the rotor cores are arranged along the axial direction, and the claw-shaped magnetic pole proximal ends of the rotor cores at both axial ends are arranged in the circumferential direction. The width is formed narrower than the circumferential width of the claw-shaped magnetic pole base end of the other rotor core.
Leakage magnetic flux is generated in the rotor cores arranged at both ends in the axial direction. Therefore, when all the claw-shaped magnetic poles of the respective rotor cores have the same shape, a part of the magnetic flux of the annular magnet becomes a leakage magnetic flux. And the width | variety of the nail | claw-shaped magnetic pole base part of a rotor core can be made wide compared with the case where all the nail | claw-shaped magnetic poles of each rotor core are made into the same shape. Therefore, it is possible to increase the magnetic force of the annular magnet, that is, to use a strong permanent magnet, as compared with the case where all the claw-shaped magnetic poles of the respective rotor cores have the same shape. Therefore, the amount of magnetic flux in each claw-shaped magnetic pole increases, that is, the effective amount of magnetic flux can be increased.

According to a fourth aspect of the present invention, in the rotor according to the first aspect, the magnetic flux guiding portion is formed by projecting a central portion in the circumferential direction inward in the radial direction.
According to the present invention, magnetic saturation occurs in the portion protruding inward in the radial direction, so that the leakage magnetic flux between the claw-shaped magnetic pole and the core base is reduced.

A fifth aspect of the present invention is a motor including the rotor according to any one of the first to fourth aspects.
According to the present invention, a motor including a rotor capable of increasing the effective magnetic flux amount can be provided.

  ADVANTAGE OF THE INVENTION According to this invention, the rotor and motor which can aim at the increase in effective magnetic flux can be provided.

1 is a schematic cross-sectional view of a motor according to an embodiment. The schematic perspective view of the rotor of 1st embodiment. (A) (b) is explanatory drawing of a rotor core and an interpolar magnet. (A) (b) is a schematic perspective view of a rotor core. The schematic sectional drawing of the rotor of 1st embodiment. (A)-(d) is explanatory drawing which shows another form of a claw-shaped magnetic pole. (A) (b) is a schematic perspective view of the rotor of 2nd embodiment. (A) (b) is explanatory drawing of a rotor core and an interpolar magnet. The schematic sectional drawing of the rotor of 2nd embodiment. (A) (b) is explanatory drawing which shows another form of a claw-shaped magnetic pole.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings.
As shown in FIG. 1, a motor case 2 of a motor 1 includes a housing 3 formed in a bottomed cylindrical shape, and an end plate that closes an opening on the front side (left side in FIG. 1) of the cylindrical housing 3. 4. A box 5 containing a power circuit such as a circuit board is attached to an end of the housing 3 on the rear side (right side in FIG. 1). A stator 6 is fixed to the inner peripheral surface of the 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 has a rotating shaft 12 and is disposed inside the stator 6. The rotating shaft 12 is a non-magnetic metal and is rotatably supported by bearings 13 and 14 disposed on the bottom 3a of the housing 3 and the front end plate 4, respectively.

(First embodiment)
As shown in FIG. 2, the rotor 11 has first to fourth rotor cores 21 to 24 arranged along the rotation shaft 12. The first rotor core 21 and the second rotor core 22 are combined to form a pair. Similarly, the third rotor core 23 and the fourth rotor core 24 are combined to form a pair.

First, the first rotor core 21 and the second rotor core 22 will be described.
As shown in FIG. 3A, the first rotor core 21 has a first core base 21 a attached to the rotating shaft 12. The first core base 21a is formed in a disc shape. The first rotor core 21 has a plurality of (five in the present embodiment) first claw-shaped magnetic poles 21b that protrude radially outward from the outer periphery of the first core base 21a. The five first claw-shaped magnetic poles 21b are arranged at equal intervals along the circumferential direction of the first core base 21a.

  As shown in FIG. 3B, the second rotor core 22 has a second core base 22 a that is attached so as to be able to rotate integrally with the rotary shaft 12. The second core base 22a is formed in a disc shape. The second rotor core 22 has a plurality (five in this embodiment) of second claw-shaped magnetic poles 22b that protrude radially outward from the outer peripheral portion of the second core base 22a. The five second claw-shaped magnetic poles 22b are arranged at equal intervals along the circumferential direction of the second core base 22a.

  As shown in FIG. 4A, the first claw-shaped magnetic pole 21b extends in the axial direction from one of the protruding portion 21c extending radially outward from the first core base 21a and the axial end surface of the protruding portion 21c. It has a claw portion 21d extending along. As shown in FIG. 4B, the second claw-shaped magnetic pole 22b extends in the axial direction from one of the protruding portion 22c extending radially outward from the second core base 22a and the axial end surface of the protruding portion 22c. It has a claw portion 22d extending along.

  As shown in FIG. 5, the first rotor core 21 and the second rotor core 22 are combined such that the claw-shaped magnetic poles 21b and 22b protrude in opposite directions along the axial direction. As shown in FIG. 2, the claw-shaped magnetic poles 21 b of the first rotor core 21 and the claw-shaped magnetic poles 22 b of the second rotor core 22 are alternately arranged along the circumferential direction of the rotor 11.

  The claw portion 22d of the first claw-shaped magnetic pole 21b extends from the surface of the first core base 21a facing the second core base 22a to the surface of the second core base 22a opposite to the first core base 21a. Is formed. Similarly, the claw portion 22d of the second claw-shaped magnetic pole 22b extends from the surface of the second core base 22a facing the first core base 21a to the surface of the first core base 21a opposite to the second core base 22a. It is formed as follows.

  As shown in FIG. 5, an annular magnet 28 is disposed between the first core base 21a and the second core base 22a. The annular magnet 28 of this embodiment is formed in an annular shape. The outer diameter φ1 of the annular magnet 28 is set to be the same as the outer diameter φ2 of the first core base 21a and the second core base 22a. The first core base 21 a of the first rotor core 21 and the second core base 22 a of the second rotor core 22 sandwich the annular magnet 28 in the axial direction of the rotary shaft 12.

  The annular magnet 28 is a plate-like permanent magnet that is magnetized along the front and back direction (the axial direction of the rotary shaft 12). And the 1st main surface (for example, surface of N pole) of the annular magnet 28 is closely_contact | adhered with the 1st core base 21a. The second main surface (for example, the surface of the S pole) of the annular magnet 28 is in close contact with the second core base 22a. Accordingly, the annular magnet 28 causes the claw-shaped magnetic pole 21b of the first rotor core 21 to function as the first magnetic pole (N pole), and causes the claw-shaped magnetic pole 22b of the second rotor core 22 to function as the second magnetic pole (S pole). .

  As shown in FIG. 3A, the protruding portion 21c is formed in an arc shape when viewed in the axial direction. The width (length of the arc on the outer peripheral side) L3 of each first claw-shaped magnetic pole 21b in the circumferential direction is set smaller than the interval L4 between the two first claw-shaped magnetic poles 21b adjacent in the circumferential direction. As shown in FIG. 4A, the two side surfaces of the claw portion 21d facing in the circumferential direction are formed so as to be on the same plane as the two side surfaces of the protruding portion 21c facing in the circumferential direction. Further, the radially outer side surface 21e of the claw portion 21d is formed to be on the same arc as the radially outer side surface of the protruding portion 21c. The radially inner claw portion 21d side surface 21f is formed such that the circumferential center portion is closer to the radially outer side surface 21e of the claw portion 21d than both circumferential ends of the claw portion 21d. In the present embodiment, as shown in FIG. 3B, the radially inner side surface 21f is formed by two flat surfaces.

  The radially inner side surface 21f formed in this way and the outer peripheral surface 22g of the second core base 22a radially facing the radially inner side surface 21f form a substantially triangular prism-shaped gap 25 extending along the axial direction. To do. The circumferential center of the radially inner side surface 21f, that is, the line of intersection of the two planes, that is, the radially outer vertex of the gap 25 is the center line of the first claw-shaped magnetic pole 21b (the circumferential center of the claw-shaped magnetic pole 21b). A straight line connecting the axis center of the rotary shaft 12).

  As shown in FIG. 3B, the protrusion 22c is formed in an arc shape in the axial direction. The width (length of the arc on the outer peripheral side) L5 of each second claw-shaped magnetic pole 22b in the circumferential direction is set smaller than the interval L6 between the two second claw-shaped magnetic poles 22b adjacent in the circumferential direction. As shown in FIG. 4B, the two side surfaces of the claw portion 22d facing in the circumferential direction are formed on the same plane as the two side surfaces of the protruding portion 22c facing in the circumferential direction. Further, the radially outer side surface 22e of the claw portion 22d is formed to be on the same arc as the radially outer side surface of the protruding portion 22c. The radially inner claw portion 22d side surface 22f is formed such that the circumferential center portion is closer to the radially outer side surface 22e of the claw portion 22d than both circumferential ends of the claw portion 22d. In the present embodiment, as shown in FIG. 3A, the radially inner side surface 22f is formed by two planes. The radially inner side surface 22f formed in this way and the outer peripheral surface 21g of the first core base 21a facing the radially inner side surface 22f in the radial direction form a substantially triangular prism-shaped gap 26 extending along the axial direction. To do. The circumferential center of the radially inner side surface 22f, that is, the intersecting line between the two planes, that is, the radially outer vertex of the gap 26, is the center line of the second claw-shaped magnetic pole 22b (the circumferential center of the claw-shaped magnetic pole 22b). A straight line connecting the axis center of the rotary shaft 12).

  As shown in FIG. 5, the first rotor core 21 and the fourth rotor core 24 disposed at both axial ends of the rotating shaft 12 are formed in the same shape. The second rotor core 22 and the third rotor core 23 disposed between the first rotor core 21 and the fourth rotor core 24 are formed in the same shape.

  An annular magnet 29 is disposed between the third rotor core 23 and the fourth rotor core 24. The annular magnet 29 is formed in the same shape as the annular magnet 28 and magnetized.

  And the 4th main surface (for example, surface of N pole) of the annular magnet 29 is closely_contact | adhered with the 4th core base 24a. The third main surface (for example, the surface of the S pole) of the annular magnet 29 is in close contact with the third core base 23a. Therefore, the annular magnet 29 causes the claw-shaped magnetic pole 24b of the fourth rotor core 24 to function as the fourth magnetic pole (N pole), and causes the claw-shaped magnetic pole 23b of the third rotor core 23 to function as the third magnetic pole (S pole). .

  As shown in FIG. 2, the first rotor core 21 and the fourth rotor core 24 are attached to the rotating shaft 12 such that the claw-shaped magnetic poles 21 b and 24 b are arranged along the axial direction of the rotating shaft 12. Yes. The first rotor core 21 and the fourth rotor core 24 are arranged so that the claw-shaped magnetic poles 21b and 24b extend in opposite directions. Accordingly, the tip of the claw-shaped magnetic pole 21b of the first rotor core 21 and the tip of the claw-shaped magnetic pole 24b of the fourth rotor core 24 are in contact with each other.

  Similarly, the second rotor core 22 and the third rotor core 23 are attached to the rotary shaft 12 such that the claw-shaped magnetic poles 22b and 23b are arranged along the axial direction of the rotary shaft 12. The second rotor core 22 and the third rotor core 23 are arranged so that the claw-shaped magnetic poles 22b and 23b extend in opposite directions. Accordingly, the base end of the claw-shaped magnetic pole 22b of the second rotor core 22 and the base end of the claw-shaped magnetic pole 23b of the third rotor core 23 are in contact with each other.

  As shown in FIG. 3A, an interpole magnet 31 is disposed between the first claw-shaped magnetic pole 21b and the second claw-shaped magnetic pole 22b adjacent in the circumferential direction. Each interpole magnet 31 is formed in a rectangular shape extending along the radial direction as viewed in the axial direction of the rotary shaft 12. As shown in FIG. 3 (b), the length in the radial direction of each interpole magnet 31 is substantially equal to the radial length of the circumferential side surface of the first claw-shaped magnetic pole 21b. Further, as shown in FIG. 2, each interpole magnet 31 is formed in a rectangular shape in the radial direction of the rotating shaft 12. That is, each interpole magnet 31 is formed in a rectangular parallelepiped shape.

  As shown in FIG. 2, each interpole magnet 31 is formed so as to extend along the axial direction of the rotating shaft 12. The length of each interpole magnet 31 is equal to the distance from the two end surfaces exposed in the axial direction of the rotating shaft 12, that is, the axially outer end surface of the first rotor core 21 to the axially outer end surface of the fourth rotor core 24.

  Then, as shown in FIG. 3A, each interpole magnet 31 is disposed so as to have an angle with respect to the radial direction of the rotor 11. That is, the claw-shaped magnetic poles of the rotor cores 21 to 24 are configured such that the interpole magnets 31 disposed between the claw-shaped magnetic poles have an angle with respect to the radial direction of the rotor cores 21 to 24. For example, as shown in FIG. 3 (a), the first claw-shaped magnetic pole 21b has an intersection O1 of a line segment (shown by an alternate long and short dash line) passing through the centers of two inter-pole magnets 31 adjacent to both sides in the circumferential direction. The rotation center of the rotor 11, that is, the outer side in the radial direction from the center of the rotation shaft 12, is formed so as to approach the first claw-shaped magnetic pole 21b. The intersection O1 is set on a center line connecting the center of the claw-shaped magnetic pole 21b and the center of the rotating shaft 12 in the circumferential direction. In other words, the angle between the circumferential side surfaces of the claw-shaped magnetic pole 21b is set so that the two inter-pole magnets 31 adjacent to the claw-shaped magnetic pole 21b in the circumferential direction are symmetrical with respect to the center line of the claw-shaped magnetic pole 21b. ing.

  Further, as shown in FIG. 3B, the second claw-shaped magnetic pole 22b has an intersection O2 of a line segment (shown by a one-dot chain line) passing through the centers of the two interpole magnets 31 adjacent to both sides in the circumferential direction. The rotation center of the rotor 11, that is, the outer side in the radial direction from the center of the rotation shaft 12, is formed so as to be away from the second claw-shaped magnetic pole 22b. The intersection O2 is set on a center line connecting the center of the claw-shaped magnetic pole 22b and the center of the rotary shaft 12 in the circumferential direction. That is, the angle between the two circumferential side surfaces of the claw-shaped magnetic pole 22b is set so that the two inter-pole magnets 31 adjacent to the claw-shaped magnetic pole 22b in the circumferential direction are symmetric with respect to the center line of the claw-shaped magnetic pole 22b. ing.

  Therefore, the circumferential width (see FIG. 3A) of the base end portion of the first claw-shaped magnetic pole 21b is larger than the circumferential width of the base end portion of the second claw-shaped magnetic pole 22b (see FIG. 3B). It is narrower. Specifically, the width of the base end when the first claw-shaped magnetic pole and the second claw-shaped magnetic pole have the same shape is defined as the reference width L0. The width L1 of the base end portion of the first claw-shaped magnetic pole 21b is narrower by ΔL than the reference width L0. On the other hand, the width L2 of the base end portion of the second claw-shaped magnetic pole 22b is wider by ΔL than the reference width L0.

  Each interpole magnet 31 is magnetized so that the surface adjacent to the claw-shaped magnetic pole in the circumferential direction has the same polarity as the adjacent claw-shaped magnetic pole. For example, each interpole magnet 31 passes through a plane orthogonal to the axis center of the rotating shaft 12 and is magnetized along a direction orthogonal to each center on the plane. The N pole of the interpolar magnet 31 is in contact with the first claw-shaped magnetic pole 21b, and the S pole of the interpolar magnet 31 is in contact with the second claw-shaped magnetic pole 22b.

  The claw-shaped magnetic pole 23 b of the third rotor core 23 is formed in the same manner as the claw-shaped magnetic pole 22 b of the second rotor core 22. Further, the claw-shaped magnetic pole 24 b of the fourth rotor core 24 is formed in the same manner as the claw-shaped magnetic pole 21 b of the first rotor core 21. Therefore, detailed description and drawings of the claw-shaped magnetic pole 23b of the third rotor core 23 and the claw-shaped magnetic pole 24b of the fourth rotor core 24 are omitted.

Next, the operation of the motor 1 will be described.
When a drive current is supplied to the segment conductor (SC) winding 8 via the power circuit in the circuit housing box 5, the motor 1 generates a magnetic field for rotating the rotor 11 by the stator 6. Driven by rotation.

  In the interpolar magnet 31 disposed between the first claw-shaped magnetic pole 21b and the second claw-shaped magnetic pole 22b adjacent in the circumferential direction, the N pole of the interpolar magnet 31 is in contact with the first claw-shaped magnetic pole 21b having the same polarity. , S pole is in contact with the second claw-shaped magnetic pole 22b. The length in the substantially radial direction of the end surface on the circumferential side of the first claw-shaped magnetic pole 21 b is substantially equal to the length in the substantially radial direction of the interpole magnet 31. The N pole of the interpole magnet 31 is in contact with the circumferential end surface of the first claw-shaped magnetic pole 21 b that functions as the N pole by the annular magnet 28. Accordingly, the magnetic flux of the interpole magnet 31 enters the first claw-shaped magnetic pole 21b from the circumferential end surface of the first claw-shaped magnetic pole 21b, and the stator 6 (see FIG. 1) from the radially outer side surface 21e of the first claw-shaped magnetic pole 21b. ). That is, the magnetic flux generated between the first claw-shaped magnetic pole 21 b and the stator 6 includes the magnetic flux by the annular magnet 28 and the magnetic flux by the interpole magnet 31. In other words, the axially viewed triangular portions formed at both circumferential ends of each first claw-shaped magnetic pole 21b by the circumferential both end surfaces of the first claw-shaped magnetic pole 21b and the radially inner side surface 21f are interpole magnets 31. Of the first claw-shaped magnetic pole 21b functions as a magnetic flux guiding portion that guides the radially outer side surface 21e of the first claw-shaped magnetic pole 21b, that is, the end surface of the first claw-shaped magnetic pole 21b facing the stator 6. Thus, the amount of magnetic flux from the rotor 11 toward the stator 6 increases more than the amount of magnetic flux of the annular magnet 28 alone.

  Further, the interpolar magnet 31 disposed between the first claw-shaped magnetic pole 21b and the second claw-shaped magnetic pole 22b adjacent in the circumferential direction is in contact with the surface having the same polarity as the polarity of the claw-shaped magnetic pole functioning by the annular magnet 28. To do. Therefore, each interpole magnet 31 inhibits direct magnetic flux formation from the first claw-shaped magnetic pole 21b toward the second claw-shaped magnetic pole 22b. As a result, the direct leakage magnetic flux between the first claw-shaped magnetic pole 21b and the second claw-shaped magnetic pole 22b is reduced.

  The radially inner side surface 22f of the claw portion 22d of the second claw-shaped magnetic pole 22b that functions as the S pole by the annular magnet 28 is formed in the same manner as the claw portion 21d of the first claw-shaped magnetic pole 21b. Accordingly, the axially triangular portions formed at both circumferential ends of the second claw-shaped magnetic poles 22b are opposed to the stator 6 by the circumferential end surfaces and the radially inner side surfaces 22f of the second claw-shaped magnetic poles 22b. It functions as a magnetic flux guiding part that guides the magnetic flux entering from the end face of the second claw-shaped magnetic pole 22 b, that is, the radially outer side surface 22 e of the second claw-shaped magnetic pole 22 b to the interpole magnet 31.

  The radially inner side surface 21f of the first claw-shaped magnetic pole 21b is formed such that the central portion in the circumferential direction approaches the radially outer side surface 21e of the first claw-shaped magnetic pole 21b with respect to both end portions in the circumferential direction. The radially inner side surface 21f and the outer peripheral surface 22g of the second core base 22a facing each other form a gap 25. The air gap 25 suppresses the formation of magnetic flux from the first claw-shaped magnetic pole 21b functioning as the N pole toward the outer peripheral surface 22g of the second core base 22a in contact with the S pole of the annular magnet 28. Therefore, the air gap 25 reduces the leakage magnetic flux from the first claw-shaped magnetic pole 21b toward the second core base 22a.

  As shown in FIG. 3A and FIG. 3B, the circumferential width of the base end portion of the first claw-shaped magnetic pole 21b is the reference width when the claw-shaped magnetic poles of the rotor cores 21 to 24 have the same shape. The width in the circumferential direction of the base end portion of the second claw-shaped magnetic pole 22b is set wider than the reference width. Therefore, the intersection of the center lines of the interpolar magnets 31 arranged between the first claw-shaped magnetic pole 21b and the second claw-shaped magnetic pole 22b adjacent in the circumferential direction is the intersection of the center lines of the claw-shaped magnetic poles 21b and 22b. That is, it is deviated from the rotation center of the rotor 11. Therefore, when the rotor 11 is rotated, each interpolar magnet 31 is pressed against the circumferential side surface of the first claw-shaped magnetic pole 21b by centrifugal force. For this reason, the magnets 31 are prevented from coming out of the rotor 11.

  The width in the circumferential direction of the base end portion of the first claw-shaped magnetic pole 21b is set to be narrower than the reference width when the claw-shaped magnetic poles of the rotor cores 21 to 24 have the same shape. Accordingly, the volumes of the first rotor core 21 and the fourth rotor core 24 are smaller than those of the rotor core formed with the base end portion having the reference width. That is, the amount of material (for example, iron material) is reduced. Moreover, since the volume is small, the rotor 11 becomes light.

  As described above, the operation of the first rotor core 21 and the second rotor core 22 has been described. The third rotor core 23 has the same shape as the second rotor core 22, and the fourth rotor core 24 has the same shape as the first rotor core 21. Accordingly, the third rotor core 23 and the fourth rotor core 24 have the same effects as described above.

  As shown in FIG. 5, the core bases 21a and 24a of the rotor cores 21 and 24 having claw-shaped magnetic poles 21b and 24b that function as the same polarity (N pole in this embodiment) are exposed on both sides in the axial direction. Accordingly, a magnetic flux (leakage magnetic flux) is generated from these core bases 21a, 24a that is not directed to the claw-shaped magnetic poles 21b, 24b. On the other hand, the core bases 22a and 23a of the rotor cores 22 and 23 each having the claw-shaped magnetic poles 22b and 23b functioning as the S pole are adjacent to each other, and the annular magnets 28 and 29 are adjacent to each other on the outer side in the axial direction. Absent. Accordingly, no leakage magnetic flux occurs in the core bases 22a and 23a. This causes a difference between the amount of magnetic flux from the core bases 21a, 24a toward the claw-shaped magnetic poles 21b, 24b and the amount of magnetic flux from the claw-shaped magnetic poles 22b, 23b toward the core bases 22a, 23a.

[When the claw-shaped magnetic poles of the rotor cores 21 to 24 are formed in the same shape as each other]
Since the claw-shaped magnetic poles of the rotor cores 21 to 24 have the same shape, the magnetic force of the annular magnets 28 and 29 is set by the amount of magnetic flux that can pass through the claw-shaped magnetic pole base ends of the rotor cores 22 and 23 arranged on the inner side. Is done. This is because even if the amount of magnetic flux generated by the annular magnets 28 and 29 is increased, magnetic saturation occurs at the claw-shaped magnetic pole base ends of the rotor cores 22 and 23, and the magnetic flux is not effective for rotation. At this time, a leakage magnetic flux is generated in the rotor cores 21 and 24 arranged at both ends in the axial direction, so that magnetic saturation does not occur at the claw-shaped magnetic pole base ends of the rotor cores 21 and 24.

[In the case of the claw-shaped magnetic poles 21b to 24b of this embodiment]
As shown in FIGS. 3 (a) and 3 (b), the widths of the claw-shaped magnetic poles 21b and 24b at the base end portions are the reference widths (basis when the claw-shaped magnetic poles of the rotor cores 21 to 24 have the same shape as each other). The width of the claw-shaped magnetic poles 22b and 23b is wider than the reference width. Accordingly, when an annular magnet used for a rotor core having a claw-shaped magnetic pole having a reference width is used, magnetic saturation does not occur in the claw-shaped magnetic poles 22b and 23b. That is, the magnetic force of the annular magnet can be increased. When this annular magnet is used, the widths of the claw-shaped magnetic poles 21b and 24b base end portions are set so that magnetic saturation does not occur at the claw-shaped magnetic poles 21b and 24b base end portions of the present embodiment. For example, the widths of the base end portions of the claw-shaped magnetic poles 21b to 24b and the magnetic force of the annular magnets 28 and 29 are set so that magnetic saturation occurs in the claw-shaped magnetic poles 21b to 24b. The rotor 11 using the annular magnets 28 and 29 having increased magnetic force in this way has a larger amount of magnetic flux in the claw-shaped magnetic poles 21b to 24b than a rotor having the same claw-shaped magnetic poles. That is, the amount of magnetic flux effective for the rotation of the rotor 11 increases.

As described above, the present embodiment has the following effects.
(1a) The first to fourth rotor cores 21 to 24 of the rotor 11 are arranged along the axial direction of the rotary shaft 12. The claw-shaped magnetic poles 21b and 22b of the first and second rotor cores 21 and 22 are formed to protrude radially outward from the outer peripheral portions of the core bases 21a and 22a, and are alternately arranged along the circumferential direction. Each claw-shaped magnetic pole 21b, 22b is formed to extend in the opposite direction along the axial direction. Similarly, the claw-shaped magnetic poles 23b, 24b of the third and fourth rotor cores 23, 24 are formed to protrude radially outward from the outer peripheral portions of the core bases 23a, 24a, and are alternately arranged along the circumferential direction. Each claw-shaped magnetic pole 23b, 24b is formed to extend in opposite directions along the axial direction.

  The axially triangular portions formed at both circumferential ends of the first claw-shaped magnetic poles 21b by the circumferential both end surfaces and the radially inner side surfaces 21f of the first claw-shaped magnetic poles 21b are magnetic fluxes of the interpole magnets 31. Functions as a magnetic flux guiding portion that guides the first claw-shaped magnetic pole 21 b to the radially outer side surface 21 e, that is, the end surface of the first claw-shaped magnetic pole 21 b facing the stator 6. Thus, the amount of magnetic flux from the rotor 11 toward the stator 6 can be increased more than the amount of magnetic flux of the annular magnet 28 alone, that is, the effective magnetic flux amount can be increased.

  The radially inner side surface 22f of the claw portion 22d of the second claw-shaped magnetic pole 22b that functions as the S pole by the annular magnet 28 is formed in the same manner as the claw portion 21d of the first claw-shaped magnetic pole 21b. Accordingly, the axially triangular portions formed at both circumferential ends of the second claw-shaped magnetic poles 22b are opposed to the stator 6 by the circumferential end surfaces and the radially inner side surfaces 22f of the second claw-shaped magnetic poles 22b. It functions as a magnetic flux guiding part that guides the magnetic flux entering from the end face of the second claw-shaped magnetic pole 22 b, that is, the radially outer side surface 22 e of the second claw-shaped magnetic pole 22 b to the interpole magnet 31. Therefore, the effective magnetic flux amount in the rotor 11 can be increased.

  (1b) Direct magnetic flux can be reduced without providing a magnet between the claw-shaped magnetic poles 21b to 24b and the core bases 21a to 24a. Thereby, the amount of effective magnetic flux can be increased. Moreover, since the magnet between the claw-shaped magnetic poles 21b to 24b and the core bases 21a to 24a is not required, an increase in the number of parts and the manufacturing process can be suppressed accordingly.

  (1c) An annular magnet 28 is disposed between the core bases 21a and 22a of the first and second rotor cores 21 and 22 to be paired. The annular magnet 28 is sandwiched between the core bases 21a and 22a. Similarly, an annular magnet 29 is disposed between the core bases 23a and 24a of the third and fourth rotor cores 23 and 24 to be paired, and the annular magnet 29 is sandwiched between the core bases 23a and 24a.

  The circumferential widths of the claw-shaped magnetic poles 21b, 24b of the rotor cores 21, 24 arranged at both axial ends are narrower than the claw-shaped magnetic poles 22b, 23b of the rotor cores 22, 23. Yes. Therefore, the widths of the base end portions of the claw-shaped magnetic poles 22b and 23b of the rotor cores 22 and 23 are wider than when the claw-shaped magnetic poles of the rotor cores 21 to 24 are all the same.

  Leakage magnetic flux is generated in the rotor cores 21 and 24 arranged at both ends in the axial direction. Therefore, when all the claw-shaped magnetic poles of the respective rotor cores have the same shape, a part of the magnetic flux of the annular magnet becomes a leakage magnetic flux. And the width | variety of the claw-shaped magnetic poles 22b and 23b base part of the rotor cores 22 and 23 can be made wide compared with the case where all the claw-shaped magnetic poles of each rotor core 21-24 are made into the same shape. Therefore, compared with the case where the claw-shaped magnetic poles of the rotor cores 21 to 24 are all the same shape, the magnetic force of the annular magnet can be increased, that is, a strong permanent magnet can be used. As a result, the amount of magnetic flux in each of the claw-shaped magnetic poles 21b to 24b can be increased, that is, the effective amount of magnetic flux can be increased, so that high output can be achieved.

  (1d) The interpole magnet 31 is disposed between the claw-shaped magnetic poles 21b and 22b adjacent in the circumferential direction. Each interpolar magnet 31 is magnetized so that the same polarity as the claw-shaped magnetic poles 21b and 22b adjacent in the circumferential direction is opposed. Therefore, the magnetic flux of the interpole magnet 31 is included in the magnetic flux between the claw-shaped magnetic poles 21 b and 22 b and the stator 6. Thereby, the amount of effective magnetic flux can be increased. Further, the interpole magnet 31 can suppress the generation of a direct magnetic flux between the claw-shaped magnetic poles 21b and 22b. Thereby, the amount of effective magnetic flux can be increased.

  (1e) The interpolar magnet 31 is formed to extend from the end surface of the first rotor core 21 to the end surface of the fourth rotor core 24. Therefore, compared with the case where the interpolar magnet corresponding to each rotor core 21-24 is facilitated, the number of parts constituting the rotor 11 can be reduced.

  (1f) The interpole magnet 31 disposed between the claw-shaped magnetic poles 21b and 22b (between the claw-shaped magnetic poles 23b and 24b) forms an angle with respect to a straight line passing through the axis center of the rotary shaft 12. Thus, the claw-shaped magnetic poles 21b to 24b are formed. Therefore, when the rotor 11 is rotated, each interpolar magnet 31 is pressed against the circumferential side surface of the first claw-shaped magnetic pole 21b by centrifugal force. For this reason, it is possible to prevent the interpole magnets 31 from coming out of the rotor 11.

In addition, you may change said embodiment as follows.
In the above embodiment, as shown in FIGS. 3A and 3B, the radially inner side surfaces 21f and 22f of the claw-shaped magnetic poles 21b and 22b are formed by two planes. The shape may be changed as appropriate. For example, as shown in FIG. 6A, the radially inner side surface 22f may have a shape including a flat portion facing the core base. Further, as shown in FIG. 6B, the radially inner side surface 22f may be a curved surface having an arc shape in the axial direction. Further, as shown in FIG. 6C, the length of the radially inner side surface 22f is set to a value different from each other in the circumferential length of the two planes, for example, according to the rotation direction of the rotor 11, etc. Also good. Further, as shown in FIG. 6D, the central portion of the radially inner side surface 22f may be formed so as to reach the radially outer side surface 22e. 6A to 6D illustrate the second claw-shaped magnetic pole 22b, it goes without saying that the first, third, and fourth claw-shaped magnetic poles 21b, 23b, and 24b can be similarly changed. Yes.

  In the above embodiment, each interpole magnet 31 is formed so as to extend from the end face of the first rotor core 21 to the end face of the fourth rotor core 24. However, a plurality of interpole magnets may be arranged along the axial direction. Good.

(Second embodiment)
As shown in FIG. 8A, the first rotor core 41 has a first core base 41 a attached to the rotary shaft 12. The first core base 41a is formed in a disc shape. The first rotor core 41 has a plurality of (five in the present embodiment) first claw-shaped magnetic poles 41b that protrude radially outward from the outer periphery of the first core base 41a. The five first claw-shaped magnetic poles 41b are arranged at equal intervals along the circumferential direction of the first core base 41a.

  As shown in FIG. 8B, the second rotor core 42 has a second core base 42 a attached so as to be rotatable together with the rotary shaft 12. The second core base 42a is formed in a disc shape. The second rotor core 42 has a plurality (five in this embodiment) of second claw-shaped magnetic poles 42b that protrude radially outward from the outer peripheral portion of the second core base 42a. The five second claw-shaped magnetic poles 42b are arranged at equal intervals along the circumferential direction of the second core base 42a.

  As shown in FIG. 7 (b), the first claw-shaped magnetic pole 41b extends in the axial direction from one of the protruding portion 41c extending radially outward from the first core base 41a and the axial end surface of the protruding portion 41c. It has a claw portion 41d extending along. As shown in FIG. 4B, the second claw-shaped magnetic pole 42b extends in the axial direction from one of the protruding portion 42c extending radially outward from the second core base 42a and the axial end surface of the protruding portion 42c. It has a claw portion 42d extending along.

  The first rotor core 41 and the second rotor core 42 are combined such that the claw-shaped magnetic poles 41b and 42b protrude in opposite directions along the axial direction. As shown in FIG. 7A, the claw-shaped magnetic poles 41 b of the first rotor core 41 and the claw-shaped magnetic poles 42 b of the second rotor core 42 are alternately arranged along the circumferential direction of the rotor 40.

  The claw portion 42d of the first claw-shaped magnetic pole 41b extends from the surface of the first core base 41a facing the second core base 42a to the surface of the second core base 42a opposite to the first core base 41a. Is formed. Similarly, the claw portion 42d of the second claw-shaped magnetic pole 42b extends from the surface of the second core base 42a facing the first core base 41a to the surface of the first core base 41a opposite to the second core base 42a. It is formed as follows.

  As shown in FIG. 9, an annular magnet 28 formed in an annular shape is disposed between the first core base 41a and the second core base 42a. The outer diameters of the first core base 41 a and the second core base 42 a are set to be the same as the outer diameter of the annular magnet 28. The first core base 41 a of the first rotor core 41 and the second core base 42 a of the second rotor core 42 sandwich the annular magnet 28 in the axial direction of the rotary shaft 12.

  The annular magnet 28 is a plate-like permanent magnet that is magnetized along the front and back direction (the axial direction of the rotary shaft 12). And the 1st main surface (for example, surface of N pole) of the annular magnet 28 is closely_contact | adhered with the 1st core base 41a. The second main surface (for example, the surface of the S pole) of the annular magnet 28 is in close contact with the second core base 42a. Therefore, the annular magnet 28 causes the claw-shaped magnetic pole 41b of the first rotor core 41 to function as the first magnetic pole (N pole), and causes the claw-shaped magnetic pole 42b of the second rotor core 42 to function as the second magnetic pole (S pole). .

  As shown in FIG. 8A, the protrusion 41c is formed in a substantially trapezoidal shape as viewed in the axial direction in which the circumferential width gradually decreases toward the radially outer side. The outer peripheral side surface of the protruding portion 41c is formed into a curved surface having an arc shape when viewed in the axial direction. The length of the outer peripheral side surface of each protrusion 41c in the circumferential direction (the length of the arc on the outer peripheral side) is set to be smaller than the interval between the outer peripheral ends of two protrusions 41c adjacent in the circumferential direction.

  As shown in FIG. 8B, the protrusion 42c is formed in a substantially trapezoidal shape as viewed in the axial direction in which the circumferential width gradually decreases toward the radially outer side. The outer peripheral side surface of the projecting portion 42c is formed into a curved surface having an arc shape when viewed in the axial direction. The length of the outer peripheral side surface of each protrusion 42c in the circumferential direction (the length of the arc on the outer peripheral side) is set to be smaller than the interval between the outer peripheral ends of two protrusions 42c adjacent in the circumferential direction.

  As shown in FIG. 8B, the claw portion 41d of the first rotor core 41 is formed in a shape corresponding to the protruding portion 42c of the second rotor core 42 to be combined. The protrusion 42c is formed in a substantially trapezoidal shape in which the circumferential width gradually decreases toward the radially outer side. The claw portion 41d is formed in a shape corresponding to both side surfaces in the circumferential direction of the projecting portion 42c and having surfaces parallel to the respective side surfaces. As shown in FIGS. 8A and 8B, the radially outer portion of the claw portion 41d is formed in an arc shape equal to the radially outer portion of the protruding portion 42c (projecting portion 41c). The radially inner portion of the claw portion 41d corresponds to the trapezoidal protruding portion 42c and is formed in a substantially triangular shape that protrudes toward the radially inner side. Therefore, the circumferential width of the claw portion 41d is formed to be narrower inward in the radial direction than in the radial direction. The two side surfaces 41f on both sides in the circumferential direction of the triangular portion of the claw portion 41d are formed in a planar shape parallel to the circumferential side surface of the protruding portion 42c of the second rotor core 42 adjacent in the circumferential direction.

  As shown in FIG. 8A, the claw portion 42d of the second rotor core 42 is formed in a shape corresponding to the protruding portion 41c of the first rotor core 41 to be combined. The protrusion 41c is formed in a substantially trapezoidal shape in which the width in the circumferential direction gradually decreases toward the outside in the radial direction. The claw portion 42d is formed in a shape corresponding to both side surfaces in the circumferential direction of the projecting portion 41c and having surfaces parallel to the side surfaces. As shown in FIGS. 8A and 8B, the radially outer portion of the claw portion 42d is formed in an arc shape that is equal to the radially outer portion of the protruding portion 41c (the protruding portion 42c). Further, the radially inner portion of the claw portion 42d corresponds to the trapezoidal protruding portion 41c, and is formed in a substantially triangular shape protruding toward the radially inner side. Therefore, the circumferential width of the claw portion 42d is formed to be narrower toward the radially inner side than the radially outer side. The two side surfaces 42f on both sides in the circumferential direction of the triangular portion of the claw portion 42d are formed in a planar shape parallel to the circumferential side surface of the protruding portion 41c of the first rotor core 41 adjacent in the circumferential direction.

  As shown in FIG. 9, an annular magnet 29 is disposed between the third rotor core 43 and the fourth rotor core 44. The annular magnet 29 is formed in the same shape as the annular magnet 28 and magnetized. Accordingly, similarly to the first embodiment, the annular magnet 29 causes the claw-shaped magnetic pole 44b of the fourth rotor core 44 to function as the fourth magnetic pole (N-pole), and the claw-shaped magnetic pole 43b of the third rotor core 43 to function as the third magnetic pole. It functions as a magnetic pole (S pole).

  As shown in FIG. 7A, the first rotor core 41 and the fourth rotor core 44 are attached to the rotating shaft 12 so that the claw-shaped magnetic poles 41b and 44b are arranged along the axial direction of the rotating shaft 12. It is worn. The first rotor core 41 and the fourth rotor core 44 are arranged such that the claw-shaped magnetic poles 41b and 44b extend in opposite directions. Therefore, the tip of the claw-shaped magnetic pole 41b of the first rotor core 41 and the tip of the claw-shaped magnetic pole 44b of the fourth rotor core 44 are in contact with each other.

  Similarly, the second rotor core 42 and the third rotor core 43 are attached to the rotary shaft 12 so that the claw-shaped magnetic poles 42 b and 43 b are arranged along the axial direction of the rotary shaft 12. The second rotor core 42 and the third rotor core 43 are arranged so that the claw-shaped magnetic poles 42b and 43b extend in opposite directions. Accordingly, the base end of the claw-shaped magnetic pole 42b of the second rotor core 42 and the base end of the claw-shaped magnetic pole 43b of the third rotor core 43 are in contact with each other.

  An interpole magnet is disposed between two claw-shaped magnetic poles adjacent in the circumferential direction. In this embodiment, the claw-shaped magnetic pole is composed of a protruding portion and a claw portion. As shown in FIGS. 8A and 8B, the width of the projecting portion in the circumferential direction is formed in a substantially trapezoidal shape with the outer peripheral end being narrower than the base end portion, and is adjacent to the circumferential direction. A nail | claw part is arrange | positioned between protrusion parts. The radially inner portion of the claw portion is formed in a substantially triangular shape corresponding to the circumferential side surface of the protruding portion.

  Therefore, the interpolar magnets are respectively disposed between the protruding portions and the claw portions adjacent to each other along the circumferential direction. That is, as shown in FIG. 2, a first interpole magnet 51 a is disposed between the protruding portion 21 c of the first rotor core 21 and the claw portion 22 d of the second rotor core 22, and the claw portion 21 d of the first rotor core 21 A second interpole magnet 51 b is disposed between the protrusions 22 c of the second rotor core 22. Similarly, a third interpolar magnet 51c is disposed between the claw portion 24d of the fourth rotor core 24 and the protrusion 23c of the third rotor core 23, and the protrusion 24c of the fourth rotor core 24 and the claw portion of the third rotor core 23 are disposed. A fourth inter-pole magnet 51d is disposed between the first and second magnets 23d.

  As described above, the tip of the claw-shaped magnetic pole 41b of the first rotor core 41 and the tip of the claw-shaped magnetic pole 44b of the fourth rotor core 44, that is, the claw portion 41d of the first rotor core 41 and the claw portion 44d of the fourth rotor core 44 are It is arranged along the direction. Therefore, the inner peripheral side surfaces of both the claw portions 41d and 44d are on the same plane. Further, the base end of the claw-shaped magnetic pole 42b of the second rotor core 42 and the base end of the claw-shaped magnetic pole 43b of the third rotor core 43, that is, the protrusion 42c of the second rotor core 42 and the protrusion 43c of the third rotor core 43 are arranged in the axial direction. It is arranged along. Therefore, the circumferential side surfaces of both protrusions 42c and 43c are on the same plane. For this reason, the second interpole magnet 51b and the third interpole magnet 51c are integrally formed.

  Each of the interpolar magnets 51a to 51d is formed in a parallelogram shape when viewed in the axial direction. Moreover, each interpolar magnet 51a-51d is formed in the radial direction rectangular shape. The interpolar magnets 51 a to 51 d are arranged so as to have an angle with respect to the radial direction of the rotor 40. That is, the claw-shaped magnetic poles of the rotor cores 41 to 44 are configured such that the interpole magnets 51 a to 51 d disposed between the claw-shaped magnetic poles have an angle with respect to the radial direction of the rotor cores 41 to 44.

  For example, as shown in FIG. 8B, the first claw-shaped magnetic pole 41b has an intersection O1 of a line segment (shown by a one-dot chain line) passing through the centers of two inter-pole magnets 51a adjacent to both sides in the circumferential direction. The rotation center of the rotor 40, that is, the outer side in the radial direction than the center of the rotation shaft 12, is formed so as to be close to the first claw-shaped magnetic pole 41 b. The intersection point O1 is set on a center line connecting the center of the claw-shaped magnetic pole 41b and the center of the rotary shaft 12 in the circumferential direction. That is, the angles of the circumferential side surfaces of the claw-shaped magnetic pole 41b are set so that the two inter-pole magnets 51a adjacent to the claw-shaped magnetic pole 41b in the circumferential direction are symmetrical with respect to the center line of the claw-shaped magnetic pole 41b. ing.

  Similarly, as shown in FIG. 8A, the second claw-shaped magnetic pole 42b has an intersection O2 of a line segment (shown by a one-dot chain line) passing through the centers of the two inter-pole magnets 51b adjacent on both sides in the circumferential direction. The rotation center of the rotor 40, that is, the outer side in the radial direction from the center of the rotation shaft 12, is formed so as to be away from the second claw-shaped magnetic pole 42b. The intersection O2 is set on a center line connecting the center of the claw-shaped magnetic pole 42b and the center of the rotating shaft 12 in the circumferential direction. That is, the angle between the two circumferential side surfaces of the claw-shaped magnetic pole 42b is set so that the two inter-pole magnets 51b adjacent to the claw-shaped magnetic pole 42b in the circumferential direction are symmetrical with respect to the center line of the claw-shaped magnetic pole 42b. ing.

  Each of the interpolar magnets 51a to 51d is magnetized so that the surface adjacent to the claw-shaped magnetic pole in the circumferential direction has the same polarity as the adjacent claw-shaped magnetic pole. The N poles of the interpolar magnets 51a and 51b are in contact with the first claw-shaped magnetic pole 41b, and the S poles of the interpolar magnets 51a and 51b are in contact with the second claw-shaped magnetic pole 42b. Similarly, the N poles of the interpolar magnets 51c and 51d are in contact with the fourth claw-shaped magnetic pole 44b, and the S poles of the interpolar magnets 51c and 51d are in contact with the third claw-shaped magnetic pole 43b.

Next, the operation of the rotor 40 will be described.
In the interpolar magnets 51a and 51b disposed between the first claw-shaped magnetic pole 41b and the second claw-shaped magnetic pole 42b adjacent in the circumferential direction, the N poles of the interpolar magnets 51a and 51b are first claw-shaped having the same polarity. The S pole is in contact with the magnetic pole 41b and the second claw-shaped magnetic pole 42b is in contact. The claw portion 41d of the first claw-shaped magnetic pole 41b is formed in a substantially triangular shape with the center in the circumferential direction protruding radially inward. Accordingly, the magnetic flux of the interpole magnet 51a enters the first claw-shaped magnetic pole 41b from the claw portion 41d of the first claw-shaped magnetic pole 41b, and enters the stator 6 (see FIG. 1) from the outer peripheral surface 41e of the first claw-shaped magnetic pole 41b. It reaches. That is, the magnetic flux generated between the first claw-shaped magnetic pole 41b and the stator 6 includes the magnetic flux due to the annular magnet 28 and the magnetic flux due to the interpole magnet 51a. That is, in the claw portion 41d, the portion formed in a substantially triangular shape with the center in the circumferential direction protruding radially inward opposes the magnetic flux of the interpole magnet 51a to the outer peripheral surface of the first claw-shaped magnetic pole 41b, that is, the stator 6. It functions as a magnetic flux guiding portion that leads to the end face of the first claw-shaped magnetic pole 41b. In this way, the amount of magnetic flux from the rotor 40 toward the stator 6 is larger than the amount of magnetic flux of the annular magnet 28 alone.

  Further, the interpolar magnets 51a and 51b disposed between the first claw-shaped magnetic pole 41b and the second claw-shaped magnetic pole 42b adjacent in the circumferential direction are surfaces having the same polarity as the polarity of the claw-shaped magnetic pole functioning by the annular magnet 28. Touch. Accordingly, the interpole magnets 51a and 51b inhibit the formation of a direct magnetic flux from the first claw-shaped magnetic pole 41b to the second claw-shaped magnetic pole 42b. As a result, the direct leakage magnetic flux between the first claw-shaped magnetic pole 41b and the second claw-shaped magnetic pole 42b is reduced.

  In addition, the claw portion 41d is formed in a substantially triangular shape with a central portion in the circumferential direction protruding radially inward. Accordingly, the magnetic flux from the claw portion 41d functioning as the N pole toward the second core base 42a serving as the S pole is concentrated on the protruding apex portion. Accordingly, since magnetic saturation occurs at the apex portion on the radially inner side of the claw portion 41d, the amount of magnetic flux from the claw portion 41d toward the core base 42a is reduced. That is, by forming the radially inner portion of the claw portion 41d in a substantially triangular shape, the amount of magnetic flux from the claw portion 41d toward the core base 42a, that is, the amount of leakage magnetic flux is reduced.

  As shown in FIGS. 8A and 8B, the center lines of the interpolar magnets 51a and 51b disposed between the first claw-shaped magnetic pole 41b and the second claw-shaped magnetic pole 42b adjacent in the circumferential direction. Is shifted from the intersection of the center lines of the claw-shaped magnetic poles 41 b and 42 b, that is, from the rotation center of the rotor 40. Therefore, when the rotor 40 is rotated, the interpolar magnets 51a and 51b are pressed against the circumferential side surface of the first claw-shaped magnetic pole 41b by centrifugal force. For this reason, the interpolar magnets 51a and 51b are prevented from coming out of the rotor 40.

  As shown in FIG. 7B, the first rotor core 41 includes a protrusion 41c that protrudes radially outward from the outer periphery of the first core base 41a, and a claw that extends from the protrusion 41c along the axial direction. It has a portion 41d. As shown in FIG. 9, the magnetic flux generated by the annular magnet 28 reaches the stator 6 (see FIG. 1) from the core base 41 a via the protruding portion 41 c and the claw portion 41 d. However, since the claw portion 41d protrudes in the axial direction from the protruding portion 41c, the magnetic flux of the annular magnet 28 is difficult to pass. As a result, in the claw-shaped magnetic pole 41b, a difference occurs between the magnetic flux density on the base end side (projecting portion 41c) and the magnetic flux density on the distal end side (claw portion 41d).

  In the present embodiment, as shown in FIG. 2, the N pole of the interpole magnet 51a is in contact with the claw portion 41d that functions as the N pole. Therefore, the magnetic flux of the interpolar magnet 51a reaches the stator 6 via the claw portion 41d. For this reason, by increasing the magnetic flux amount of the claw portion 41d by the interpolar magnet 51a, the claw-shaped magnetic pole 41b has a magnetic flux density between the proximal end (projecting portion 41c) and the distal end side (claw portion 41d). The difference can be reduced.

  As described above, the operation in the first rotor core 41 has been mainly described. As described above, the second to fourth rotor cores 42 to 44 have the same shape as the first rotor core 41. Accordingly, the second to fourth rotor cores 42 to 44 have the same effect as described above.

  As shown in FIG. 9, the core bases 41a and 44a of the rotor cores 41 and 44 having claw-shaped magnetic poles 41b and 44b that function as the same polarity (N pole in this embodiment) are exposed on both sides in the axial direction. Accordingly, a magnetic flux (leakage magnetic flux) is generated from these core bases 41a and 44a that is not directed to the claw-shaped magnetic poles 41b and 44b. On the other hand, the core bases 42a and 43a of the rotor cores 42 and 43 having the claw-shaped magnetic poles 42b and 43b functioning as the S pole are adjacent to each other, and the annular magnets 28 and 29 are adjacent to each other on the outer side in the axial direction. Absent. Accordingly, no leakage magnetic flux occurs in the core bases 42a and 43a. Therefore, there is a difference between the amount of magnetic flux from the core bases 41a and 44a toward the claw-shaped magnetic poles 41b and 44b and the amount of magnetic flux from the claw-shaped magnetic poles 42b and 43b toward the core bases 42a and 43a.

  In the present embodiment, as shown in FIG. 2, the interpole magnet 51 a abuts on the claw portion 41 d of the first rotor core 41, and the interpole magnet 51 b, on the claw portions 42 d and 43 d of the second and third rotor cores 42 and 43. 51 c is in contact, and the interpole magnet 51 d is in contact with the claw portion 44 d of the fourth rotor core 44. It is possible to make the magnetic forces of the interpolar magnets 51a to 51d different from each other. Therefore, the magnetic flux corresponding to the leakage magnetic flux based on the above arrangement can be replenished by increasing the magnetic force of the interpole magnets 51a and 51d contacting the claw portions 41d and 44d of the first and fourth rotor cores 41 and 44. It becomes. This reduces the difference between the amount of magnetic flux from the core bases 41a, 44a toward the claw-shaped magnetic poles 41b, 44b and the amount of magnetic flux from the claw-shaped magnetic poles 42b, 43b toward the core bases 42a, 43a. Almost uniform can be achieved.

As described above, the present embodiment has the following effects.
(2a) The first to fourth rotor cores 41 to 44 of the rotor 40 are disposed along the axial direction of the rotary shaft 12. The claw-shaped magnetic poles 41b and 42b of the first and second rotor cores 41 and 42 are formed to protrude radially outward from the outer peripheral portions of the core bases 41a and 42a, and are alternately arranged along the circumferential direction. Each claw-shaped magnetic pole 41b, 42b is formed to extend in opposite directions along the axial direction. Similarly, the claw-shaped magnetic poles 43b and 44b of the third and fourth rotor cores 43 and 44 are formed to protrude radially outward from the outer peripheral portions of the core bases 43a and 44a, and are alternately arranged along the circumferential direction. Each claw-shaped magnetic pole 43b, 44b is formed to extend in the opposite direction along the axial direction.

  The claw portions 41d to 44d of the claw-shaped magnetic poles 41b to 44b are formed in a substantially triangular shape with the center portion in the circumferential direction protruding radially inward. Then, the interpolar magnets 51a to 51d are in contact with the inclined surface of the portion formed in a substantially triangular shape. The portion formed in a substantially triangular shape functions as a magnetic flux guiding portion that guides the magnetic flux of the interpole magnets 51 a and 51 d to the outer peripheral surface of the claw-shaped magnetic poles 41 b and 44 b, that is, the end surfaces of the claw-shaped magnetic poles 41 b and 44 b facing the stator 6. To do. In this manner, the amount of magnetic flux from the rotor 40 toward the stator 6 can be increased more than the amount of magnetic flux of only the annular magnets 28 and 29, that is, the effective magnetic flux amount can be increased.

  (2b) The claw portions 41d to 44d of the claw-shaped magnetic poles 41b to 44b are formed in a substantially triangular shape with a central portion in the circumferential direction protruding radially inward. Accordingly, the magnetic flux from the claw portion 41d functioning as the N pole toward the second core base 42a serving as the S pole is concentrated on the protruding apex portion. Accordingly, since magnetic saturation occurs at the apex portion on the radially inner side of the claw portion 41d, the amount of magnetic flux from the claw portion 41d toward the core base 42a is reduced. That is, by forming the radially inner portion of the claw portion 41d in a substantially triangular shape, it is possible to reduce the amount of magnetic flux from the claw portion 41d toward the core base 42a, that is, the amount of leakage magnetic flux, thereby reducing the decrease in effective magnetic flux. can do.

  And a direct magnetic flux can be reduced, without providing a magnet between the claw-shaped magnetic poles 41b-44b and the core bases 41a-44a. Thereby, the amount of effective magnetic flux can be increased. Further, since a magnet between the claw-shaped magnetic poles 41b to 44b and the core bases 41a to 44a is not required, an increase in the number of parts (types of parts) and manufacturing processes can be suppressed accordingly.

  (2c) The interpole magnets 51a to 51d are arranged between the claw-shaped magnetic poles 41b to 44b adjacent in the circumferential direction. The interpolar magnets 51a to 51d are magnetized so as to have the same polarity as the claw-shaped magnetic poles 41b and 42b adjacent in the circumferential direction. Therefore, the generation of the direct magnetic flux between the claw-shaped magnetic poles 41b and 42b can be suppressed by the interpole magnets 51a to 51d. Thereby, the amount of effective magnetic flux can be increased.

  (2d) The interpole magnets 51a to 51d disposed between the claw-shaped magnetic poles 41b to 44b have their claw-shaped magnetic poles 41b so that their center lines form an angle with respect to a straight line passing through the axis center of the rotating shaft 12. To 44b are formed. Therefore, when the rotor 40 is rotated, the interpolar magnets 51a to 51d are pressed against the claw-shaped magnetic poles (claw portions) that come into contact by centrifugal force. For this reason, it is possible to prevent the interpole magnets 51a to 51d from coming out of the rotor 40.

In addition, you may change said 2nd embodiment as follows.
-In the said form, as shown, for example in FIG.8 (b), the circumferential direction center of the nail | claw part 41d was protruded to radial inside, and it formed so that the vertex might contact | connect the core base 42a. On the other hand, for example, as shown in FIG. 10A, the center in the circumferential direction may be formed in a flat shape so as not to protrude radially inward from the interpole magnet 51a and separated from the core base 42a. . Further, as shown in FIG. 10B, a portion between the two inter-pole magnets 51a may be recessed toward the radially outer side.

In addition, you may change each said embodiment as follows.
In the above embodiment, the interpolar magnets 51a to 51d are arranged symmetrically with respect to the center line of the claw-shaped magnetic poles 41b to 44b, but may be asymmetric. For example, the inclinations of the interpolar magnets 51a to 51d are changed according to the rotation direction and the rotation speed of the rotor 11. Even if it does in this way, the effect similar to the said embodiment is acquired.

  In the above embodiment, the annular magnets 28 and 29 are used as the field magnets. However, a plurality of flat permanent magnets may be arranged along the circumferential direction so as to field the claw-shaped magnetic poles 41b to 44b. . Alternatively, each claw-shaped magnetic pole 41b to 44b may be fielded by interposing one disk-shaped permanent magnet between the pair of core bases.

  DESCRIPTION OF SYMBOLS 11 ... Rotor, 12 ... Rotary shaft, 21-24 ... Rotor core, 21a-24a ... Core base, 21b-24b ... Claw-shaped magnetic pole, 21c-24c ... Projection part, 21d-24d ... Claw part, 21e, 22e ... Radial direction Outer side surface, 21f, 22f ... direction inner side surface, 28, 29 ... annular magnet (field magnet), 31 ... interpolar magnet, 40 ... rotor, 41-44 ... rotor core, 41a-44a ... core base, 41b-44b ... Claw-shaped magnetic poles, 41c to 44c... Projecting portions, 41d to 44d... Claw portions, 51a to 51d.

Claims (5)

At least a pair of rotor cores arranged in the axial direction, having a plurality of claw-shaped magnetic poles protruding from the outer peripheral portion of the disk-shaped core base and extending along the axial direction and arranged alternately along the circumferential direction When,
A field magnet disposed between a pair of rotor cores and magnetized along an axial direction;
A plurality of interpole magnets arranged between the claw-shaped magnetic poles adjacent in the circumferential direction and magnetized so that the surfaces of the same polarity as the claw-shaped magnetic poles face each other;
With
At the tip of the claw-shaped magnetic pole, a magnetic flux guiding portion that guides the magnetic flux of the interpolar magnet to the outer peripheral side surface of the claw-shaped magnetic pole is formed.
A rotor characterized by that. The rotor according to claim 1, wherein
The rotor is characterized in that the magnetic flux guiding portion is formed by bringing the circumferential center of the radially inner side surface closer to the radially outer side surface than both circumferential sides. The rotor according to claim 2, wherein
At least two pairs of the rotor cores are arranged along the axial direction;
The circumferential width of the claw-shaped magnetic pole base end of the rotor core at both axial ends is formed narrower than the circumferential width of the claw-shaped magnetic pole base end of the other rotor core,
A rotor characterized by that. The rotor according to claim 1, wherein
The rotor is characterized in that the magnetic flux guiding portion is formed by projecting a central portion in the circumferential direction toward the inside in the radial direction.   The motor provided with the rotor as described in any one of Claims 1-4.