JP6338245B2 - Multi-rundel motor - Google Patents

Description

  The present invention relates to a multi-rundel type motor.

  The motor has a Landel rotor composed of a pair of rotor cores having a plurality of claw-shaped magnetic poles in the circumferential direction and permanent magnets arranged between the rotor cores, and each claw-shaped magnetic pole alternately functions as a different magnetic pole. Landel motors are known. Further, Patent Document 1 includes a pair of stator cores having a plurality of claw-shaped magnetic poles in the circumferential direction in addition to the Landel type rotor, and an annular winding disposed between the stator cores. There have been proposed Landell type motors having Landel type stators that function in different magnetic poles. This Landell type motor is also called a multi-Landel type motor because the rotor and the stator are both of the Landel type.

  Since the multi-Landel motor can change the number of poles by changing the number of claw-shaped magnetic poles, it has a feature that it is easy to make it multi-polar.

JP 2013-2226026 A

  By the way, in the motor as described above, there was a gap between the claw-shaped magnetic poles adjacent to each other in the circumferential direction, and the magnetic flux leaked from this gap. Further, for example, if a gap is formed on the back surface of the claw-shaped magnetic pole, the magnetic flux may leak from the gap. Since an increase in leakage flux causes a decrease in the output of the motor, some measures are required, but there is a demand for a structure that does not increase the number of parts.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a multi-Landel motor capable of realizing a structure in which leakage magnetic flux is suppressed with a reduced number of parts. .

A multi-Landel motor that solves the above-described problems includes a first claw-shaped magnetic pole having a base portion extending in the radial direction from the core base and a magnetic pole portion extending in the axial direction from the tip of the base portion. And a rotor having a second rotor core, a permanent magnet disposed between the first and second rotor cores and magnetized in the axial direction, a base extending radially from the core base, and an axial direction from the tip of the base A stator having first and second stator cores each having a plurality of claw-shaped magnetic poles each having an extended magnetic pole portion; and a stator having windings disposed in a circumferential direction between the first and second stator cores. In the multi-Landel type motor, the rotor is arranged on the back surface of the rotor-side magnetic pole portion and is magnetized in the radial direction, the claw-shaped magnetic poles of the first rotor core, and the claw-shape of the second rotor core. Magnetic pole Of the peripheral is disposed between a direction circumferentially magnetized the interpolar magnet portion is provided with an auxiliary magnet formed by integrally formed, said rotor, said first and second rotor cores, said permanent magnet and said auxiliary magnet Are arranged in parallel in the axial direction, and each of the rotor units is configured to be sequentially shifted in the circumferential direction from one axial end to the other axial end, and adjacent to each other in the axial direction. Between the matching rotor units, the interpole magnet portions of the auxiliary magnets of each rotor unit are integrally formed with the stator side portion in the radial direction of the interpole magnet portions adjacent in the axial direction. The portions on the side opposite to the stator in the radial direction between the interpole magnet portions adjacent in the axial direction are separated without being integrally formed .

According to this configuration, the rear magnet portion disposed on the back surface of the magnetic pole portion on the rotor side and magnetized in the radial direction is disposed between the claw-shaped magnetic poles of the first rotor core and the claw-shaped magnetic poles of the second rotor core. An auxiliary magnet is integrally formed with the interpolar magnet portion magnetized in the circumferential direction. For this reason, it becomes possible to implement | achieve the structure which makes it difficult to leak magnetic flux from the clearance gap between a 1st rotor core and a 2nd rotor core, suppressing a number of parts.
Further, the interpole magnets of the auxiliary magnets of the rotor unit adjacent in the axial direction are integrated, so that an increase in the number of parts can be further suppressed.

  In the multi-Landel type motor, the back magnet portion is disposed on the back surface of each magnetic pole portion on the rotor side, and the interpole magnet portion includes the claw-shaped magnetic poles of the first rotor core and the claw-shaped magnetic poles of the second rotor core. It is preferable that each of the back magnet portions and each of the interpole magnet portions are integrally formed so that the auxiliary magnet has an annular shape.

According to this structure, it becomes possible to handle the annular auxiliary magnet in which each back magnet part and each interpole magnet part are integrally formed as one part, and the number of parts can be further suppressed.
In the multi Lundell motor, the magnetization direction of the permanent magnet of the rotor units adjacent to each other in the axial direction are opposite to each other, before Symbol stator, said first and second stator core and a stator unit which is composed of the winding It is preferable that a plurality of the stator units are arranged side by side in the axial direction, and the stator units are configured to be sequentially shifted in the direction opposite to the shifting direction of the rotor units from one axial end to the other axial end.

  According to this configuration, the rotor unit composed of the first and second rotor cores, the permanent magnets, and the auxiliary magnets is composed of a plurality of rundel-type rotors arranged in parallel in the axial direction, the first and second stator cores, and the windings. A multi-Landel motor having a plurality of stages is constituted by a Landel-type stator in which a plurality of stator units arranged in parallel in the axial direction. In a multi-rundel type motor with a multi-stage configuration that tends to have a large number of parts, it is possible to increase the number of parts by applying a configuration in which the back magnet part and the interpole magnet part of the auxiliary magnet of each rotor unit are integrated. It is more effective in suppressing

  In the multi-Landel type motor, in each of the rotor units, the interpole magnet portion includes a first interpole magnet portion magnetized in one circumferential direction and a second interpole magnet portion magnetized in the other circumferential direction. It is preferable that the first interpole magnet portion of each rotor unit is configured not to be adjacent in the axial direction to the second interpole magnet portion of the rotor unit adjacent in the axial direction.

  When the first interpole magnet portion and the second interpole magnet portion whose magnetization directions are opposite to each other between the rotor units are adjacent to each other in the axial direction, the mutual magnetism affects each other and the first and second poles Although it is feared that the magnetic flux leakage suppression effect by the magnet portion is weakened, this configuration can suppress it.

In the multi-Landel motor, it is preferable that the permanent magnet and the auxiliary magnet are made of different materials.
According to this configuration, since the permanent magnet and the auxiliary magnet are made of different materials, the magnetic flux of each magnet can be easily adjusted and the output can be adjusted.

In the multi-Landel motor, it is preferable that the orientation direction of the auxiliary magnet is polar anisotropic orientation.
According to this configuration, each of the back magnet part and the interpole magnet part can be magnetized so as to have a component in the optimum direction.

In the multi-Landel motor, it is preferable that the permanent magnet and the auxiliary magnet are integrally formed.
According to this configuration, an increase in the number of parts can be further suppressed by integrating the permanent magnet and the auxiliary magnet.

  According to the multi-Landel type motor of the present invention, a structure in which leakage magnetic flux is suppressed can be realized with a reduced number of parts.

It is a perspective view of the motor of an embodiment. It is a perspective view of the rotor of the same form. It is a disassembled perspective view of the rotor unit of the same form. It is a perspective view of the U phase and W phase rotor unit in the same form. It is a perspective view of the V phase rotor unit in the form. It is an expanded view which expands and shows the rotor outer periphery of the same form planarly. It is a top view of the field magnet and auxiliary magnet of the same form. It is a cross-sectional perspective view of the stator of the same form. It is a disassembled perspective view of the stator unit of the same form. It is an expanded view which expands and shows the stator inner periphery of the same form planarly. It is a perspective view which shows the auxiliary magnet of another example. It is a top view which shows the auxiliary magnet and field magnet of another example.

Hereinafter, an embodiment of a multi-Landel motor will be described.
As shown in FIG. 1, the motor 11 of this embodiment includes a rotor 12 fixed to a rotating shaft (not shown), and an annular stator 13 arranged outside the rotor 12 and fixed to a motor housing (not shown). And.

[Configuration of rotor]
As shown in FIG. 2, the rotor 12 includes a U-phase rotor unit Ru, a V-phase rotor unit Rv, and a W-phase rotor unit Rw that are sequentially stacked in the axial direction. Each rotor unit Ru, Rv, Rw has substantially the same configuration.

  As shown in FIGS. 2 and 3, each rotor unit Ru, Rv, Rw includes first and second rotor cores 21, 22 and a field magnet 23 sandwiched between the first and second rotor cores 21, 22. The auxiliary magnet 40 is arranged on the outer peripheral side of the field magnet 23.

  The first rotor core 21 has a disk-shaped first rotor core base 24 having a through hole 24a through which the rotating shaft is inserted and fixed at the center of the diameter. Four first rotor side claw-shaped magnetic poles 25 are provided on the outer peripheral edge of the first rotor core base 24 at equal intervals (90-degree intervals) in the circumferential direction.

  The first rotor-side claw-shaped magnetic pole 25 includes a radially extending portion 25a extending radially outward from the outer peripheral edge of the first rotor core base 24, and a distal end portion (radially outer end portion) of the radially extending portion 25a. The first magnetic pole portion 25b protrudes. The first rotor-side claw-shaped magnetic pole 25 may be formed by bending the first magnetic pole part 25b at a right angle with respect to the radial extension part 25a, or may be formed by casting to form the radial extension part 25a. The first magnetic pole portion 25b may be integrally formed.

  The radially extending portion 25a is formed in a trapezoidal shape that becomes narrower toward the radially outer side when viewed from the axial direction. The first magnetic pole portion 25b is formed in a rectangular shape when viewed from the radial direction. And both the circumferential direction both sides | surfaces of the 1st rotor side claw-shaped magnetic pole 25 which consists of the radial direction extension part 25a and the 1st magnetic pole part 25b are each flat surfaces, and it is formed so that it may mutually approach as it goes to radial direction outer side. Yes. Further, the first rotor side claw-shaped magnetic pole 25 is line-symmetric with respect to the circumferential center. Note that the radially outer surface of each first magnetic pole portion 25b has an arcuate shape located on the same circle centered on the rotational axis of the rotor 12 when viewed from the axial direction.

  As shown in FIG. 3, the second rotor core 22 has the same shape as the first rotor core 21, and has a second rotor core base 26 and a second rotor side claw-shaped magnetic pole 27. The second rotor core base 26 (through hole 26a) and the second rotor side claw-shaped magnetic pole 27 (radially extending portion 27a and second magnetic pole portion 27b) are respectively connected to the first rotor core base 24 (through hole 24a) and the first rotor. It has the same shape as the side claw-shaped magnetic pole 25 (the radially extending portion 25a and the first magnetic pole portion 25b).

  As shown in FIG. 2, the first rotor core 21 and the second rotor core 22 are assembled so that the tips of the magnetic pole portions 25b and 27b face in opposite directions, and between the circumferential directions of the first magnetic pole portions 25b. Each 2nd magnetic pole part 27b is arrange | positioned. The first magnetic pole portion 25b and the second magnetic pole portion 27b are configured to be alternately arranged in the circumferential direction in the assembled state and to be positioned at equal intervals in the circumferential direction.

In the assembled state of the first and second rotor cores 21 and 22, the first and second rotor core bases 24 and 26 are parallel to each other, and the field magnet 23 is disposed therebetween.
As shown in FIG. 3, the field magnet 23 is a disk-shaped permanent magnet made of, for example, a ferrite sintered magnet. A through hole 23 a through which the rotation shaft is inserted is formed at the center position of the field magnet 23. One end surface 23b of the field magnet 23 abuts the axial inner side surface 24b of the first rotor core base 24 and the other end surface 23c of the field magnet 23 abuts on the facing surface 26b of the second rotor core base 26. The field magnet 23 is sandwiched and fixed in the axial direction between the first rotor core base 24 and the second rotor core base 26. The outer diameter of the field magnet 23 is set to match the outer diameter of the core bases 24 and 26.

  And the arrow shown with the continuous line in FIG. 4 has shown the magnetization direction (from S pole to N pole direction) of the field magnet 23 (and auxiliary magnet 40). As shown in the figure, the field magnet 23 is magnetized in the axial direction so that the first rotor core base 24 side has an N pole and the second rotor core base 26 side has an S pole. Therefore, by this field magnet 23, each 1st rotor side claw-shaped magnetic pole 25 functions as a north pole, and each 2nd rotor side claw-shaped magnetic pole 27 functions as a south pole.

[Auxiliary magnet]
As shown in FIG. 2, each rotor unit Ru, Rv, Rw includes an annular auxiliary magnet 40 on the outer peripheral side of the field magnet 23. The auxiliary magnet 40 is a bonded magnet (plastic magnet, rubber magnet, etc.) made of a rare earth magnet such as a neodymium magnet. The auxiliary magnet 40 is fixed to the outer peripheral surface 23d of the field magnet 23 by, for example, adhesion.

  As shown in FIG. 3, the auxiliary magnet 40 has an annular shape centered on the rotation axis of the rotor 12, and the first and second back magnet portions 41 and 42 and the interpole magnet portions 43 are alternately arranged in the circumferential direction. It is integrally formed so as to be continuous.

  As shown in FIGS. 3 and 7, each first back magnet portion 41 includes a radially inner side surface of the first magnetic pole portion 25 b of each first rotor side claw-shaped magnetic pole 25, and an outer peripheral surface 23 d of the field magnet 23. It is arranged between. The first back magnet part 41 is in contact with each of the first magnetic pole part 25b and the field magnet 23 in the radial direction. In addition, each first back magnet portion 41 abuts against the radially extending portion 25a of each first rotor-side claw-shaped magnetic pole 25 in the axial direction.

  Similarly, each second back magnet part 42 is disposed between the radially inner side surface of the second magnetic pole part 27 b of each second rotor side claw-shaped magnetic pole 27 and the outer peripheral face 23 d of the field magnet 23. The second back magnet part 42 abuts each of the second magnetic pole part 27b and the field magnet 23 in the radial direction. In addition, each second back magnet part 42 abuts in the axial direction against the radially extending part 27 a of each second rotor-side claw-shaped magnetic pole 27.

  Each interpole magnet portion 43 is provided between the first and second rotor-side claw-shaped magnetic poles 25 and 27 in the circumferential direction. Specifically, each interpole magnet portion 43 is formed so as to connect the first and second back magnet portions 41 and 42 adjacent to each other in the circumferential direction, and between the first and second magnetic pole portions 25b and 27b. Further, it is formed in a shape protruding outward in the radial direction from each of the back magnet portions 41 and 42 so as to be arranged in FIG. In addition, each interpole magnet part 43 and each magnetic pole part 25b, 27b are formed so that those radial direction outer surfaces may be located on the same circle centering on the rotating shaft line of the rotor 12. FIG. In addition, the radially inner side surface of the interpole magnet portion 43 is located on the radially outer side of the radially inner side surfaces of the first and second back magnet portions 41 and 42. Thereby, a slight gap is formed between the radially inner side surface of the interpole magnet portion 43 and the outer peripheral surface 23d of the field magnet 23 (see FIG. 7).

  7 indicates the magnetization direction of the auxiliary magnet 40 (from the S pole to the N pole). As shown in the figure, the auxiliary magnet 40 is magnetized so as to suppress the leakage magnetic flux (short-circuit magnetic flux) of the field magnet 23 in each of the back magnet portions 41 and 42 and the interpole magnet portion 43. More specifically, the first back magnet part 41 is magnetized in the radial direction so that the radially outer side (the first magnetic pole part 25b side) is an N pole having the same polarity as the first magnetic pole part 25b. Similarly, the second back magnet part 42 is magnetized in the radial direction so that the radially outer side (the second magnetic pole part 27b side) becomes the S pole having the same polarity as the second magnetic pole part 27b. Each interpole magnet section 43 is magnetized in the circumferential direction so that the first magnetic pole section 25b side is an N pole and the second magnetic pole section 27b side is an S pole.

  The first and second rotor cores 21 and 22 and the two types of magnets (field magnet 23 and auxiliary magnet 40) incorporated in the rotor cores 21 and 22 constitute each rotor unit Ru, Rv, and Rw. Yes.

  Each rotor unit Ru, Rv, Rw having a so-called Landel-type structure using the field magnet 23 as described above has a first rotor-side claw-shaped magnetic pole 25 that is an N pole and a second that is an S pole. The rotor-side claw-shaped magnetic poles 27 are alternately arranged in the circumferential direction, and the number of magnetic poles is eight (four pole pairs).

Next, the laminated structure of the rotor units Ru, Rv, Rw of each phase will be described.
As shown in FIG. 6, a U-phase rotor unit Ru, a V-phase rotor unit Rv, and a W-phase rotor unit Rw are sequentially stacked in the axial direction to constitute the rotor 12.

  Here, the U-phase and W-phase rotor units Ru, Rw are stacked such that the first rotor core 21 is on the upper side, and the V-phase rotor unit Rv is stacked so that the second rotor core 22 is on the upper side. That is, the middle-stage V-phase rotor unit Rv is stacked face down with respect to the upper and lower U-phase and W-phase rotor units Ru and Rw (see FIGS. 4 and 5). Thus, the second rotor core bases 26 are adjacent in the axial direction between the U-V phases, and the first rotor core bases 24 are adjacent in the axial direction between the V-W phases.

  The magnetization directions of the U-phase and W-phase field magnets 23 are the same (upward in FIG. 6), and the magnetization directions of the V-phase field magnets 23 are the U-phase and W-phase field magnets 23. The direction is opposite to the magnetization direction. More specifically, the S poles of the U-phase and V-phase field magnets 23 face each other via two adjacent second rotor core bases 26. Further, the N poles of the V-phase and W-phase field magnets 23 face each other via two adjacent first rotor core bases 24. In this manner, the field magnets 23 of the respective phases have the magnetization directions in the axial direction opposite to each other in the adjacent phases.

  Further, the protruding directions in the axial direction of the first magnetic pole portions 25b (first rotor-side claw-shaped magnetic poles 25) of the U-phase and W-phase rotor units Ru, Rw are the same direction (downward in FIG. 6). In contrast, the protruding direction of each V-phase first magnetic pole portion 25b is opposite to the U-phase and W-phase first magnetic pole portion 25b (upward in FIG. 6).

  Similarly, the protruding directions in the axial direction of the second magnetic pole portion 27b (second rotor-side claw-shaped magnetic pole 27) of the U-phase and W-phase rotor units Ru, Rw are the same direction (upward in FIG. 6). The protruding direction of the V-phase second magnetic pole portion 27b is opposite to the direction (downward in FIG. 6).

  The rotor units Ru, Rv, and Rw of each phase are stacked with their phases shifted in order by the shift angle θr. More specifically, the phase shift angle θr of each phase is set to 60 degrees in electrical angle (15 degrees in mechanical angle), and the V-phase rotor unit Rv is clockwise with respect to the U-phase rotor unit Ru. Are arranged with a phase shift of 60 degrees in electrical angle (15 degrees in mechanical angle). Further, the W-phase rotor unit Rw is arranged with a phase shift of 60 degrees in electrical angle (15 degrees in mechanical angle) with respect to the V-phase rotor unit Rv in the clockwise direction.

Further, the interpole magnet portion 43 of the auxiliary magnet 40 is also shifted by 60 degrees in electrical angle (15 degrees in mechanical angle) in the clockwise direction from the U phase to the W phase.
Here, as shown in FIG. 6, when the rotor 12 is viewed from the U-phase side in the axial direction, the interpolar magnet portion magnetized in the clockwise direction (that is, counterclockwise with respect to the first magnetic pole portion 25b). The interpole magnet portion adjacent in the rotation direction) is defined as a first interpole magnet portion 43a. On the other hand, the interpole magnet portion magnetized in the counterclockwise direction (that is, the interpole magnet portion adjacent to the first magnetic pole portion 25b in the clockwise direction) is defined as the second interpole magnet portion 43b.

  Each U-phase first interpole magnet portion 43a is axially adjacent to each V-phase first interpole magnet portion 43a and each V-phase second magnetic pole portion 27b, and each V-phase second pole. The intermediate magnet portion 43b is configured not to be adjacent to the axial direction.

  In addition, each V-phase first interpole magnet portion 43a is adjacent to each U-phase first interpole magnet portion 43a and each U-phase first magnetic pole portion 25b on one side in the axial direction, and each W-phase magnet portion 43a. The first interpole magnet portion 43a and the W-phase second magnetic pole portion 27b are adjacent to each other on the other side in the axial direction. That is, each V-phase first interpole magnet portion 43a is configured not to be adjacent in the axial direction to each U-phase and W-phase second interpole magnet portion 43b.

  Each W-phase first interpole magnet portion 43a is adjacent to each V-phase first interpole magnet portion 43a and each V-phase first magnetic pole portion 25b in the axial direction. It is comprised so that it may not adjoin with the magnet part 43b between 2 poles in an axial direction.

  In this way, the first interpole magnet portion 43a of each rotor unit Ru, Rv, Rw is not adjacent to the second interpole magnet portion 43b of the rotor unit Ru, Rv, Rw adjacent in the axial direction. It is configured.

[Structure of stator]
As shown in FIG. 8, the stator 13 disposed on the radially outer side of the rotor 12 has three phases (U phase, V phase, and W phase) stacked in the axial direction corresponding to each rotor unit Ru, Rv, Rw. ) Stator units Su, Sv, Sw. Each stator unit Su, Sv, Sw has substantially the same configuration, and windings disposed between the first and second stator cores 31, 32 and the first and second stator cores 31, 32 in the axial direction. 33.

  As shown in FIGS. 8 and 9, the first stator core 31 has an annular first stator core base 34. The first stator core base 34 is formed in a plate shape whose plate surface is perpendicular to the axial direction. The first stator core base 34 has a cylindrical cylindrical wall 34a extending in the axial direction from the outer peripheral edge thereof. Four first stator side claw-shaped magnetic poles 35 are formed on the inner peripheral edge of the first stator core base 34 so as to extend at equal intervals (intervals of 90 degrees).

  The first stator-side claw-shaped magnetic pole 35 includes a radially extending portion 35a extending radially inward from the inner peripheral edge of the first stator core base 34, and a distal end portion (radially inner end portion) of the radially extending portion 35a. The first magnetic pole portion 35b protrudes in one axial direction. The first stator side claw-shaped magnetic pole 35 may be formed by bending the first magnetic pole part 35b at a right angle with respect to the radial extension part 35a, or may be formed by casting to form the radial extension part 35a. The first magnetic pole portion 35b may be integrally formed.

  The radially extending portion 35a is formed in a trapezoidal shape that becomes narrower as it goes inward in the radial direction when viewed from the axial direction. The first magnetic pole portion 35b is formed in a rectangular shape when viewed from the radial direction. That is, both ends in the circumferential direction of the radially inner side surface (the surface facing the rotor 12) of the first magnetic pole portion 35b are linear along the axial direction. The first stator side claw-shaped magnetic pole 35 is line symmetric with respect to the circumferential center.

  As shown in FIG. 9, the second stator core 32 has the same shape as the first stator core 31, and has a second stator core base 36 and a second stator side claw-shaped magnetic pole 37. The second stator core base 36 (cylindrical wall 36a) and the second stator side claw-shaped magnetic pole 37 (radially extending portion 37a and second magnetic pole portion 37b) are connected to the first stator core base 34 (cylindrical wall 34a) of the first stator core 31, respectively. ) And the first stator side claw-shaped magnetic pole 35 (radially extending portion 35a and first magnetic pole portion 35b), respectively.

  As shown in FIG. 8, the first stator core 31 and the second stator core 32 are assembled so that the tips of the magnetic pole portions 35b and 37b face in opposite directions, and between the circumferential directions of the first magnetic pole portions 35b. Each 2nd magnetic pole part 37b is arrange | positioned. The first magnetic pole part 35b and the second magnetic pole part 37b are arranged alternately in the circumferential direction in the assembled state and are positioned at equal intervals in the circumferential direction.

  In the assembled state, the first and second stator core bases 34 and 36 are parallel to each other. Further, the cylindrical walls 34a, 36a of the first and second stator core bases 34, 36 are in contact with each other in the axial direction to constitute outer peripheral walls of the stator units Su, Sv, Sw. A winding 33 having an annular shape in the circumferential direction is arranged in the space between the axial directions of the first and second stator core bases 34 and 36 on the inner peripheral side of the cylindrical walls 34a and 36a.

  The stator unit Su, Sv, Sw configured as described above is an 8-pole so-called Randel type in which the first and second stator side claw-shaped magnetic poles 35, 37 are excited to different magnetic poles from time to time by the winding 33. (Claw pole type) structure.

Next, the laminated structure of the stator units Su, Sv, Sw of each phase will be described.
As shown in FIG. 10, a U-phase stator unit Su, a V-phase stator unit Sv, and a W-phase stator unit Sw are sequentially stacked in the axial direction to form a stator 13. The stator units Su, Sv, Sw are stacked such that the first stator core base 34 and the second stator core base 36 are alternately arranged in the axial direction.

  In addition, the stator units Su, Sv, Sw of each phase are stacked with their phases shifted in order by the shift angle θs. Specifically, the phase shift angle θs of each phase is set to 60 degrees in electrical angle (15 degrees in mechanical angle), and the V-phase stator unit Sv rotates counterclockwise with respect to the U-phase stator unit Su. They are arranged with a phase shift of 60 degrees in electrical direction (15 degrees in mechanical angle). Further, the W-phase stator unit Sw is arranged with a phase shift of 60 degrees in electrical angle (15 degrees in mechanical angle) in the counterclockwise direction with respect to the V-phase stator unit Sv.

  Thereby, the deviation direction (counterclockwise direction) from the U-phase stator unit Su to the W-phase stator unit Sw is opposite to the deviation direction (clockwise direction) from the U-phase rotor unit Ru to the W-phase rotor unit Rw. It becomes. In other words, the rotor 12 and the stator 13 are opposite in phase shift direction in units of each phase.

Next, the operation of this embodiment will be described.
When a three-phase AC power supply voltage is applied to the stator 13, the U-phase power supply voltage is applied to the winding 33 of the U-phase stator unit Su, the V-phase power supply voltage is applied to the winding 33 of the V-phase stator unit Sv, and the W-phase stator unit. A W-phase power supply voltage is applied to each of the windings 33 of Sw. As a result, a rotating magnetic field is generated in the stator 13 and the rotor 12 is driven to rotate.

  Here, as described above, the auxiliary magnets 40 of the respective rotor units Ru, Rv, Rw are first and second arranged respectively on the back side (in the radial direction) of the first and second magnetic pole portions 25b, 27b. The back magnet parts 41 and 42 and the interpolar magnet part 43 arrange | positioned between the 1st and 2nd rotor side claw-shaped magnetic poles 25 and 27 adjacent to the circumferential direction are provided. The auxiliary magnet 40 is magnetized so as to suppress the leakage magnetic flux (short-circuit magnetic flux) of the field magnet 23 in each of the first and second back magnet portions 41 and 42 and the interpole magnet portion 43 (see FIG. 4 and FIG. 4). (See FIG. 7).

  As a result, the occurrence of leakage magnetic flux on the back side of each magnetic pole part 25b, 27b is suppressed by each back magnet part 41, 42, and the first and second rotor side claws adjacent in the circumferential direction by the inter-pole magnet part 43. Generation of leakage magnetic flux between the magnetic poles 25 and 27 is suppressed, and it can contribute to high output of the motor 11. Furthermore, since each back magnet part 41 and 42 and each interpole magnet part 43 are integrally formed, the auxiliary magnet 40 having each back magnet part 41 and 42 and each interpole magnet part 43 is handled as one component. This makes it possible to reduce the number of parts.

Next, characteristic effects of the present embodiment will be described.
(1) The rotor 12 includes rear magnet portions 41 and 42 that are arranged on the back surfaces (radially inside) of the magnetic pole portions 25b and 27b of the first and second rotor side claw-shaped magnetic poles 25 and 27 and are magnetized in the radial direction. The auxiliary magnet 40 is formed by integrally forming an interpole magnet portion 43 disposed between the first magnetic pole portion 25b and the second magnetic pole portion 27b and magnetized in the circumferential direction. For this reason, it is possible to realize a structure that makes it difficult for magnetic flux to leak from the gap between the first rotor core 21 and the second rotor core 22 with a reduced number of parts.

  (2) The back magnet portions 41 and 42 are disposed on the back surfaces of the magnetic pole portions 25b and 27b, and the interpole magnet portion 43 is disposed between the first magnetic pole portion 25b and the second magnetic pole portion 27b in the circumferential direction. The back magnet portions 41 and 42 and the interpolar magnet portions 43 are integrally formed so that the auxiliary magnet 40 has an annular shape. For this reason, the auxiliary magnet 40 can be handled as one component, and the number of components can be further suppressed.

  (3) In the rotor 12, three-phase rotor units Ru, Rv, Rw each composed of the first and second rotor cores 21, 22, the field magnet 23, and the auxiliary magnet 40 are arranged in order in the axial direction. The magnetization directions of the field magnets 23 of the rotor units Ru, Rv, Rw adjacent in the axial direction are opposite to each other, and each rotor unit Ru, Rv, Rw is moved from one axial side (U-phase side) to the other axial side. (W-phase side) is shifted in the circumferential direction (clockwise direction) in order. In addition, the stator 13 includes three-phase stator units Su, Sv, Sw each composed of first and second stator cores 31, 32 and a winding 33, which are sequentially arranged in the axial direction. The stator units Su, Sv, Sw are sequentially shifted in the direction opposite to the shifting direction of the rotor units Ru, Rv, Rw from one axial end side (U-phase side) to the other axial end side (W-phase side). Configured. According to this configuration, the Randel type rotor 12 in which the rotor units Ru, Rv, and Rw are arranged in parallel in the axial direction and the Landel type stator 13 in which the stator units Su, Sv, and Sw are arranged in parallel in the axial direction are used. A multi-rundel motor with a multi-stage configuration is configured. In a multi-rundel type motor having a multi-stage configuration that tends to have a large number of parts, a configuration in which the back magnet portions 41 and 42 of the auxiliary magnet 40 of each rotor unit Ru, Rv, and Rw and the interpole magnet portion 43 are integrated. Applying is more effective in suppressing an increase in the number of parts.

  (4) In each rotor unit Ru, Rv, Rw, the interpole magnet portion 43 includes a first interpole magnet portion 43a magnetized in one circumferential direction and a second interpole magnet magnetized in the other circumferential direction. Part 43b. The first interpole magnet portion 43a of each rotor unit Ru, Rv, Rw is configured not to be adjacent to the second interpole magnet portion 43b of the rotor unit Ru, Rv, Rw adjacent in the axial direction. Is done. If the first inter-pole magnet part 43a and the second inter-pole magnet part 43b whose magnetization directions are opposite to each other between the rotor units Ru, Rv, and Rw are adjacent to each other in the axial direction, the mutual magnetism is affected. Accordingly, there is a concern that the leakage magnetic flux suppressing effect by the first and second interpole magnet portions 43a and 43b is weakened, but according to this configuration, it can be suppressed.

(5) Since the field magnet 23 and the auxiliary magnet 40 are made of different materials, the magnetic fluxes of the magnets 23 and 40 can be easily adjusted, and the output can be adjusted.
In addition, you may change the said embodiment as follows.

  As shown in FIG. 11, the auxiliary magnets 40 of the rotor units Ru, Rv, Rw adjacent in the axial direction may be integrally formed. In the example shown in the figure, the first interpole magnet portions 43a and the second interpole magnet portions 43b that are partially adjacent in the axial direction between the rotor units Ru, Rv, and Rw are integrally connected. Yes. As described above, the auxiliary magnets 40 of the rotor units Ru, Rv, and Rw adjacent in the axial direction are integrated with each other, whereby an increase in the number of parts can be further suppressed.

  As shown in FIG. 12, the magnetization mode of the auxiliary magnet 40 may be polar anisotropic orientation. In the example of the figure, the magnetic flux is radially inward from the outer surface of the S-pole second back magnet portion 42 to the outer surface of the N-pole first back magnet portion 41 via the adjacent inter-pole magnet portion 43. In other words, it is magnetized in a so-called polar anisotropic orientation that flows in a convex shape. Thereby, the 1st and 2nd back magnet parts 41 and 42 have the magnetic flux of a radial direction component, and the interpole magnet part 43 has the magnetic flux of a circumferential direction component, and is the same as auxiliary magnet 40 of the above-mentioned embodiment. Function. And by magnetizing so that it may have the component of an optimal direction in each of the 1st and 2nd back magnet parts 41 and 42 and the interpole magnet part 43 by making the orientation direction of auxiliary magnet 40 into polar anisotropic orientation. Is possible.

  In the above embodiment, the field magnet 23 is a ferrite magnet, but other than this, for example, a samarium cobalt (SmCo) magnet or a neodymium magnet may be used. In the above embodiment, the auxiliary magnet 40 is a bonded magnet made of a neodymium magnet. However, for example, a samarium cobalt (SmCo) magnet, a samarium iron nitrogen (SmFeN) magnet, or a ferrite magnet may be used. .

  In the above embodiment, the field magnet 23 and the auxiliary magnet 40 are fixed by bonding. However, for example, in the state where the field magnet 23 is sandwiched between the first and second rotor cores 21 and 22, the bonded magnet is used. The auxiliary magnet 40 may be insert-molded.

In the above embodiment, the field magnet 23 and the auxiliary magnet 40 are made of different materials, but may be made of the same material.
In the above embodiment, the field magnet 23 and the auxiliary magnet 40 are configured separately, but they may be integrally formed. When the field magnet 23 and the auxiliary magnet 40 are made of different materials, the field magnet 23 (sintered magnet) is used as an insert product, and the auxiliary magnet 40 (bonded magnet) is insert-molded. The magnet magnet 23 and the auxiliary magnet 40 may be integrally formed. Thus, by integrating the field magnet 23 and the auxiliary magnet 40, an increase in the number of parts can be further suppressed.

The number of claw-shaped magnetic poles 25, 27, 35, 37 (the number of magnetic poles) is not limited to the above embodiment, and may be changed as appropriate according to the configuration.
The number of rotor units Ru, Rv, and Rw that constitute the rotor 12 and the number of stator units Su, Sv, and Sw that constitute the stator 13 are not limited to the above-described embodiment, and are appropriately changed according to the configuration. May be.

  In the above embodiment, the present invention is applied to an inner rotor type motor in which the rotor 12 is disposed inside the stator 13, but may be applied to an outer rotor type motor.

  DESCRIPTION OF SYMBOLS 11 ... Motor (multi-rundel type motor), 12 ... Rotor, 13 ... Stator, Ru, Rv, Rw ... Rotor unit, Su, Sv, Sw ... Stator unit, 21 ... First rotor core, 22 ... Second rotor core, 23 ... Field magnet (permanent magnet), 24 ... first rotor core base, 25 ... first rotor side claw-shaped magnetic pole, 25a ... radially extending portion (base), 25b ... first magnetic pole portion, 26 ... second rotor core base, 27 ... 2nd rotor side claw-shaped magnetic pole, 27a ... Radial extension part (base part), 27b ... 2nd magnetic pole part, 31 ... 1st stator core, 32 ... 2nd stator core, 33 ... Winding, 34 ... 1st stator core Base 35, first stator side claw-shaped magnetic pole 35 a, radially extending portion (base), 35 b, first magnetic pole portion 36, second stator core base 37, second stator side claw-shaped magnetic pole 37 a, diameter Direction Extension part (base part), 37b ... 2nd magnetic pole part, 40 ... auxiliary magnet, 41 ... 1st back magnet part, 42 ... 2nd back magnet part, 43 ... interpole magnet part, 43a ... 1st interpole magnet part , 43b... Second interpole magnet part.

Claims (7)

First and second rotor cores each having a plurality of claw-shaped magnetic poles each having a base extending radially from the core base and a magnetic pole extending axially from the tip of the base; A rotor having a permanent magnet disposed between two rotor cores and magnetized in the axial direction;
First and second stator cores each having a plurality of claw-shaped magnetic poles each having a base extending radially from the core base and a magnetic pole extending axially from the tip of the base; and the first and second A multi-Landel motor comprising a stator having windings disposed in a circumferential direction between stator cores,
The rotor is disposed on the back surface of the rotor-side magnetic pole portion, and is arranged between the back magnet portion magnetized in the radial direction, and the circumferential direction between the claw-shaped magnetic pole of the first rotor core and the claw-shaped magnetic pole of the second rotor core. And an auxiliary magnet formed integrally with the interpolar magnet portion magnetized in the circumferential direction ,
In the rotor, a plurality of rotor units composed of the first and second rotor cores, the permanent magnets, and the auxiliary magnets are arranged side by side in the axial direction. It is configured to shift in the circumferential direction one side in order toward the end side,
Between the rotor units adjacent in the axial direction, the interpole magnet portions of the auxiliary magnets of each rotor unit are integrally formed with a portion on the stator side in the radial direction of the interpole magnet portions adjacent in the axial direction. In addition, a multi-Landel type motor is characterized in that the portions on the side opposite to the stator in the radial direction of the interpole magnet portions adjacent in the axial direction are separated without being integrally formed . The multi-rundel motor according to claim 1,
The back magnet portion is disposed on the back surface of each magnetic pole portion on the rotor side,
The interpolar magnet portion is disposed between each of the claw-shaped magnetic poles of the first rotor core and the claw-shaped magnetic poles of the second rotor core,
Each of the back magnet portions and each of the interpole magnet portions is integrally formed so that the auxiliary magnet has an annular shape. The multi-Randell type motor according to claim 1 or 2,
The magnetization direction of the permanent magnet of the rotor units adjacent to each other in the axial direction are opposite to each other,
In the stator, a plurality of stator units each including the first and second stator cores and the windings are arranged in parallel in the axial direction, and each of the stator units extends from one axial end to the other axial end. A multi-Landel motor characterized in that the motor is configured so as to be sequentially shifted in a direction opposite to the shifting direction. The multi-Randell type motor according to any one of claims 1 to 3,
In each of the rotor units, the interpole magnet portion includes a first interpole magnet portion magnetized in one circumferential direction and a second interpole magnet portion magnetized in the other circumferential direction,
The multi-randel type wherein the first inter-pole magnet portion of each rotor unit is configured not to be adjacent to the second inter-pole magnet portion of the rotor unit adjacent in the axial direction in the axial direction. motor. The multi-Landel motor according to any one of claims 1 to 4 ,
The multi-Landel motor, wherein the permanent magnet and the auxiliary magnet are made of different materials. In the multi-randel type motor according to any one of claims 1 to 5 ,
A multi-Randell type motor characterized in that the orientation direction of the auxiliary magnet is polar orientation. The multi-randel type motor according to any one of claims 1 to 6 ,
The multi-Landel motor, wherein the permanent magnet and the auxiliary magnet are integrally formed.