JP6062991B2 - Rotor and motor - Google Patents

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.

A rotor that solves the above problems includes a plurality of pairs of rotor cores arranged along a rotation axis, and a field magnet that is arranged between each pair of rotor cores and is magnetized along the axial direction. The rotor core has a plurality of claw-shaped magnetic poles that protrude from the outer periphery of the disk-shaped core base and extend in opposite directions along the axial direction, and are alternately arranged along the circumferential direction, The plurality of pairs of rotor cores are disposed so that the rotor cores of the same magnetic pole are adjacent to each other, and are further disposed between the claw-shaped magnetic poles adjacent in the circumferential direction, and have the same polarity as the claw-shaped magnetic poles adjacent in the circumferential direction. The claw-shaped magnetic poles are arranged such that the center line of the two inter-pole magnets arranged on both sides in the circumferential direction of each claw-shaped magnetic pole passes through the axis center of the rotating shaft. It is formed to have an angle against, the two Unlike the intersection of the center line between the magnet and the axial center of the rotary shaft, further wherein disposed radially inside the claw-shaped magnetic poles, the back auxiliary magnets the same polarity and claw-shaped magnetic poles are magnetized so as to face The back auxiliary magnet is disposed between the circumferential directions of the interpole magnets disposed on both sides in the circumferential direction of the claw-shaped magnetic pole on the radially outer side of the back auxiliary magnet, and the back auxiliary magnet is The side surfaces on both sides in the circumferential direction are in contact with the side surfaces in the circumferential direction of the interpole magnet, and two line segments passing through the side surfaces on both sides in the circumferential direction of the back auxiliary magnet are lines passing through the axis center of the rotating shaft. It is formed to have an angle with respect to the minute, and the intersection of the two line segments is different from the axis center of the rotation axis .

  According to this configuration, when the rotor is rotated, each interpole magnet is pressed against the circumferential side surface of the claw-shaped magnetic pole by centrifugal force. For this reason, it is difficult for the interpolar magnets to come out of the rotor.

A motor that solves the above problems includes the rotor.
According to this configuration, it is possible to provide a motor including a rotor capable of increasing an effective magnetic flux amount.

  According to the rotor and motor of the present invention, the effective magnetic flux can be increased.

1 is a schematic cross-sectional view of a motor according to an embodiment. The schematic perspective view of the rotor of one Embodiment. (A) (b) is explanatory drawing of a rotor core, an auxiliary magnet, and an interpolar magnet. The schematic sectional drawing of the rotor of one Embodiment.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment 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.

As shown in FIG. 2, the rotor 11 has first to fourth rotor cores 21 to 24 arranged along the rotation shaft 12.
As shown in FIG. 3A, the first rotor core 21 has a first core base 21 a fixed to the rotating shaft 12. The first core base 21a is formed in a disc shape. A plurality of (five in the present embodiment) first claw-shaped magnetic poles 21b protruding outward in the radial direction are formed on the outer peripheral portion of the first core base 21a. The intervals between the first claw-shaped magnetic poles 21b in the circumferential direction are equal to each other along the circumferential direction of the first core base 21a.

  As shown in FIG. 2, the first claw-shaped magnetic pole 21b is formed in a rectangular shape in the radial direction. As shown in FIG. 3A, the first claw-shaped magnetic pole 21b is formed in a substantially arc shape 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 to be smaller than the interval L4 between two first claw-shaped magnetic poles 21b adjacent in the circumferential direction.

  As shown in FIG. 3B, the second rotor core 22 has a second core base 22 a fixed to the rotary shaft 12, similarly to the first rotor core 21. Similar to the first core base 21a, the second core base 22a is formed in a disc shape. A plurality of (five in the present embodiment) second claw-shaped magnetic poles 22b projecting radially outward are formed on the outer peripheral portion of the second core base 22a. The intervals between the second claw-shaped magnetic poles 22b in the circumferential direction are equal to each other along the circumferential direction of the second core base 22a.

  As shown in FIG. 2, the second claw-shaped magnetic pole 22b is formed in a rectangular shape in the radial direction, similarly to the first claw-shaped magnetic pole 21b. As shown in FIG. 3B, the second claw-shaped magnetic pole 22b is formed in a substantially 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 to be smaller than the interval L6 between two second claw-shaped magnetic poles 22b adjacent in the circumferential direction.

  As shown in FIG. 4, an annular magnet 25 is disposed between the first rotor core 21 and the second rotor core 22. The outer diameter φ1 of the annular magnet 25 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 rotor core 21 and the second rotor core 22 are fixed to the rotary shaft 12 so that the first claw-shaped magnetic poles 21b and the second claw-shaped magnetic poles 22b are alternately arranged along the circumferential direction. 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 25 in the axial direction of the rotary shaft 12.

  The annular magnet 25 is a flat permanent magnet magnetized along the front and back direction (the axial direction of the rotating shaft 12). And the 1st main surface (for example, surface of N pole) of the annular magnet 25 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 25 is in close contact with the second core base 22a. Therefore, the annular magnet 25 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). .

  The first claw-shaped magnetic pole 21b extends from the surface of the first core base 21a opposite to the second core base 22a side to the surface of the second core base 22a opposite to the first core base 21a side. The second claw-shaped magnetic pole 22b extends from the surface of the second core base 22a opposite to the first core base 21a side to the surface of the first core base 21a opposite to the second core base 22a side.

  A first back auxiliary magnet 26 is disposed between the back surface (radially inner surface) of each first claw-shaped magnetic pole 21b and the outer peripheral surface of the second core base 22a. The first back auxiliary magnet 26 is formed in an arc shape in the axial direction of the rotary shaft 12. The circumferential side surface of the first back auxiliary magnet 26 is formed to be flush with the circumferential side surface of the corresponding first claw-shaped magnetic pole 21b. The first back auxiliary magnet 26 has the same first magnetic pole (for example, N pole) as the first claw-shaped magnetic pole 21b on the side that contacts the back surface of the first claw-shaped magnetic pole 21b, and the second side that contacts the second core base 22a. It is magnetized along the radial direction so as to be the same second magnetic pole (for example, S pole) as the core base 22a.

  A second back auxiliary magnet 27 is disposed between the back surface (radially inner surface) of each second claw-shaped magnetic pole 22b and the outer peripheral surface of the first core base 21a. The second back auxiliary magnet 27 is formed in an arc shape in the axial direction of the rotating shaft 12. The circumferential side surface of the second back auxiliary magnet 27 is formed to be flush with the circumferential side surface of the corresponding second claw-shaped magnetic pole 22b. The second back auxiliary magnet 27 has the same second magnetic pole (for example, S pole) as the second claw-shaped magnetic pole 22b on the side that contacts the back surface of the second claw-shaped magnetic pole 22b, and the first side that contacts the first core base 21a. It is magnetized along the radial direction so as to be the same first magnetic pole (for example, N pole) as the core base 21a.

  The first back auxiliary magnet 26 extends from the surface on the second core base 22a side in the first core base 21a to the side surface opposite to the first core base 21a side in the second core base 22a. The second back auxiliary magnet 27 extends from the surface on the first core base 21a side in the second core base 22a to the side surface opposite to the second core base 22a side in the first core base 21a.

  As shown in FIG. 4, the first rotor core 21 and the fourth rotor core 24 arranged 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 28 is disposed between the third rotor core 23 and the fourth rotor core 24. The annular magnet 28 is formed in the same shape as the annular magnet 25 and magnetized.

  And the 4th main surface (for example, surface of N pole) of the annular magnet 28 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 28 is in close contact with the third core base 23a. Accordingly, the annular magnet 28 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). .

  A third back auxiliary magnet 29 is disposed between the back surface (radially inner surface) of each third claw-shaped magnetic pole 23b and the outer peripheral surface of the fourth core base 24a. The third back auxiliary magnet 29 is formed in an arc shape in the axial direction of the rotating shaft 12. The circumferential side surface of the third back auxiliary magnet 29 is formed to be flush with the circumferential side surface of the corresponding third claw-shaped magnetic pole 23b. The third back auxiliary magnet 29 has the same third magnetic pole (for example, S pole) as the third claw-shaped magnetic pole 23b on the side contacting the back surface of the third claw-shaped magnetic pole 23b, and the fourth side on the side contacting the fourth core base 24a. It is magnetized along the radial direction so as to be the same fourth magnetic pole (for example, N pole) as the core base 24a.

  A fourth back auxiliary magnet 30 is disposed between the back surface (radially inner surface) of each fourth claw-shaped magnetic pole 24b and the outer peripheral surface of the third core base 23a. The fourth back auxiliary magnet 30 is formed in an arc shape in the axial direction of the rotating shaft 12. The circumferential side surface of the fourth back auxiliary magnet 30 is formed so as to be flush with the circumferential side surface of the corresponding fourth claw-shaped magnetic pole 24b. The fourth back auxiliary magnet 30 has a fourth magnetic pole (for example, N pole) that is in contact with the back surface of the fourth claw-shaped magnetic pole 24b and the third magnetic pole that is in contact with the third core base 23a. It is magnetized along the radial direction so as to be the same third magnetic pole (for example, S pole) as the core base 23a.

  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 interpolar magnet 31 is formed in a rectangular shape when viewed from the axial direction of the rotary shaft 12. The interpole magnet 31 of the present embodiment has a rectangular shape extending toward the inside of the rotor 11 along the circumferential end surfaces of the claw-shaped magnetic poles 21b and 22b. More specifically, the circumferential width gradually increases toward the inside. It is formed in a narrow trapezoidal 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.

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 rotor 11, the interpolar magnet 31 disposed between the first claw-shaped magnetic pole 21 b and the second claw-shaped magnetic pole 22 b adjacent in the circumferential direction is a surface having the same polarity as the polarity of the claw-shaped magnetic pole functioning by the annular magnet 25. Touch. 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 first back auxiliary magnet 26 disposed between the inner surface of the first claw-shaped magnetic pole 21 b and the second core base 22 a comes into contact with a surface having the same polarity as that of the claw-shaped magnetic pole functioning by the annular magnet 25. Accordingly, the first back auxiliary magnet 26 hinders the formation of a direct magnetic flux from the first claw-shaped magnetic pole 21b toward the second core base 22a. As a result, the direct leakage magnetic flux between the first claw-shaped magnetic pole 21b and the second core base 22a is reduced.

  Similarly, the second back auxiliary magnet 27 disposed between the inner surface of the second claw-shaped magnetic pole 22b and the first core base 21a has a surface having the same polarity as the polarity of the claw-shaped magnetic pole functioning by the annular magnet 25. Contact. Therefore, the second back auxiliary magnet 27 inhibits direct magnetic flux formation from the second claw-shaped magnetic pole 22b toward the first core base 21a. As a result, the direct leakage magnetic flux between the second claw-shaped magnetic pole 22b and the first core base 21a is reduced.

  Further, the N pole of the magnetized interpole magnet 31 is in contact with the first claw-shaped magnetic pole 21b having the same polarity, and the S pole is in contact with the second claw-shaped magnetic pole 22b. Similarly, the north pole of the magnetized first back auxiliary magnet 26 is in contact with the first claw-shaped magnetic pole 21b having the same polarity, and the south pole is in contact with the second core base 22a having the same polarity. Accordingly, 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 25, the magnetic flux by the first back auxiliary magnet 26, and the magnetic flux by the interpole magnet 31. In this way, 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 25 alone.

  The circumferential width L1 of the base end portion of the first claw-shaped magnetic pole 21b is set to be ΔL narrower than the reference width L0 when the claw-shaped magnetic poles of the rotor cores 21 to 24 have the same shape, and the second claw-shaped magnetic pole 22b base The circumferential width L2 of the end portion is set to be ΔL wider than the reference width L0. Accordingly, the intersections O1 and O2 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 are the centers of the claw-shaped magnetic poles 21b and 22b. It is deviated from the intersection of the lines, that is, the rotation center O 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 circumferential width L1 of the base end portion of the first claw-shaped magnetic pole 21b is set to be narrower than the reference width L0 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 shown in FIG. 4, the first to fourth rotor cores 21 to 24 are arranged along the axial direction (vertical direction in FIG. 4) of the rotating shaft 12. An annular magnet 25 is disposed between the first rotor core 21 and the second rotor core 22, and an annular magnet 28 is disposed between the third rotor core 23 and the fourth rotor core 24.

  As shown in FIG. 4, 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 25 and 28 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 25 and 28 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 25 and 28 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 width L1 of the claw-shaped magnetic poles 21b, 24b is equal to the reference width (when the claw-shaped magnetic poles of the rotor cores 21 to 24 have the same shape as each other). The width of the base end portion) is narrower than L0, and the width L2 of the base end portions of the claw-shaped magnetic poles 22b and 23b is wider than the reference width L0. 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 forces of the annular magnets 25 and 28 are set so that magnetic saturation occurs in the claw-shaped magnetic poles 21b to 24b. The rotor 11 using the annular magnets 25 and 28 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.
(1) The first to fourth rotor cores 21 to 24 of the rotor 11 are disposed along the axial direction of the rotary shaft 12. An annular magnet 25 is disposed between the core bases 21a and 22a of the paired first and second rotor cores 21 and 22, and the annular magnet 25 is sandwiched between the core bases 21a and 22a. Similarly, an annular magnet 28 is disposed between the core bases 23a, 24a of the third and fourth rotor cores 23, 24 that form a pair, and the annular magnet 28 is sandwiched between the core bases 23a, 24a.

  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 circumferential width L1 of the claw-shaped magnetic poles 21b and 24b of the rotor cores 21 and 24 arranged at both ends in the axial direction is narrower than the width L2 of the claw-shaped magnetic poles 22b and 23b of the rotor cores 22 and 23. Has been. 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.

  (2) A back auxiliary magnet 26 is disposed between the claw-shaped magnetic pole 21b of the first rotor core 21 and the core base 22a of the second rotor core 22, and the back auxiliary magnet 26 is a magnetic pole of each of the claw-shaped magnetic pole 21b and the core base 22a. It is magnetized so that the same polarity is opposite. Further, a back auxiliary magnet 27 that is magnetized so as to have the same polarity is disposed between the claw-shaped magnetic pole 22 b of the second rotor core 22 and the core base 21 a of the first rotor core 21. Therefore, the magnetic flux of the back auxiliary magnets 26 and 27 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 back auxiliary magnets 26 and 27 can suppress the generation of direct magnetic flux between the core bases 21a and 22a and the claw-shaped magnetic poles 21b and 22b. Thereby, the amount of effective magnetic flux can be increased.

  (3) 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.

  (4) 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, the number of parts constituting the rotor 11 can be reduced as compared with the case where the interpolar magnets corresponding to the rotor cores 21 to 24 are prepared.

  (5) The interpole magnet 31 disposed between the claw-shaped magnetic poles 21 b and 22 b (between the claw-shaped magnetic poles 23 b and 24 b) forms an angle with respect to a straight line passing through the 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 embodiment of this invention as follows.
In the above embodiment, the interpolar magnets 31 are arranged symmetrically with respect to the center line of the claw-shaped magnetic poles 21b to 24b, but may be asymmetric. That is, the intersections O1 and O2 shown in FIGS. 3A and 3B are shifted from a straight line passing through the center of the radially outer side of the claw-shaped magnetic poles 21b to 24b and the axis of the rotary shaft 12. The claw-shaped magnetic poles 21b to 24b are formed. For example, the inclination of the interpole magnet 31 is 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 circumferential width L1 of the base ends of the claw-shaped magnetic poles 21b and 24b is narrower than the circumferential width L2 of the base ends of the claw-shaped magnetic poles 22b and 23b. On the other hand, it is only necessary to be able to set the amount of magnetic flux passing between the core base and the claw-shaped magnetic pole. In the claw-shaped magnetic pole, the cross-sectional area of the portion extending from the core base toward the outer side in the circumferential direction (along the circumferential direction) The area of the cross section may be set. For example, at the base ends of the claw-shaped magnetic poles 21b and 24b of the rotor cores 21 and 24 at both ends in the axial direction, the width in the axial direction of the portion extending from the core bases 21a and 24a toward the outer side in the circumferential direction is set. The magnetic poles 22b and 23b may be narrower than the base end width. Further, the circumferential width and the axial width of the claw-shaped magnetic poles 21b and 24b may be narrower than the circumferential width and the axial width of the claw-shaped magnetic poles 22b and 23b.

In the above embodiment, the interpole magnet 31 may be omitted as appropriate.
In the above embodiment, the back auxiliary magnets 26, 27, 29, 30 may be omitted as appropriate.
In the above embodiment, the annular magnets 25 and 28 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 21b to 24b. . Alternatively, one claw-shaped permanent magnet may be interposed between the pair of core bases to field the claw-shaped magnetic poles 21b to 24b.

In the above embodiment, the interpolar magnet 31 is arranged between the claw-shaped magnetic poles 21b and 22b (between 23b and 24b), but the shape of the interpolar magnet may be different depending on the arrangement position.
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.

  DESCRIPTION OF SYMBOLS 11 ... Rotor, 12 ... Rotary shaft, 21-24 ... Rotor core, 21a-24a ... Core base, 21b-24b ... Claw-shaped magnetic pole, 25, 28 ... Annular magnet (field magnet), 26, 27, 29, 30 ... Back auxiliary magnet (auxiliary magnet), 31...

Claims (2)

A plurality of pairs of rotor cores arranged along a rotation axis;
A field magnet disposed between each pair of rotor cores and magnetized along an axial direction;
With
Each pair of rotor cores has a plurality of claw-shaped magnetic poles that protrude from the outer periphery of the disk-shaped core base, extend in opposite directions along the axial direction, and are alternately arranged along the circumferential direction. And
The plurality of pairs of rotor cores are arranged so that rotor cores of the same magnetic pole are adjacent to each other,
Furthermore, it is arranged between the claw-shaped magnetic poles adjacent to each other in the circumferential direction, and includes an interpole magnet that is magnetized so that the same polarity as that of the claw-shaped magnetic poles adjacent to each other in the circumferential direction is opposed.
The claw-shaped magnetic pole is formed such that the center line of two inter-pole magnets arranged on both sides in the circumferential direction of each claw-shaped magnetic pole has an angle with respect to a line segment passing through the axis center of the rotating shaft. , The intersection of the center lines of the two interpole magnets is different from the axis center of the rotating shaft,
In addition, a back auxiliary magnet that is arranged on the radially inner side of the claw-shaped magnetic pole and is magnetized so that the same polarity as the claw-shaped magnetic pole is opposed,
The back auxiliary magnet is arranged between the circumferential directions of the interpolar magnets arranged on both sides in the circumferential direction of the claw-shaped magnetic poles on the radially outer side of the back auxiliary magnet ,
In the back auxiliary magnet, the side surfaces on both sides in the circumferential direction are in contact with the side surfaces in the circumferential direction of the interpolar magnet, and two line segments passing through the side surfaces on both sides in the circumferential direction of the back auxiliary magnet are the rotation shafts. A rotor that is formed so as to have an angle with respect to a line segment that passes through an axis center, and an intersection of the two line segments is different from an axis center of the rotating shaft .   A motor comprising the rotor according to claim 1.