JP6007020B2 - motor - Google Patents

Description

  The present invention relates to a motor.

  The rotor used in the motor has a rotor core that has a plurality of claw-shaped magnetic poles in the circumferential direction and is combined, and field magnets are arranged between them to function each claw-shaped magnetic pole as a different magnetic pole alternately There is a so-called permanent magnet field rundel-type rotor (see, for example, Patent Document 1). In such a Landell-type rotor, when changing the number of poles, it is possible to easily cope with the change in the number of poles by changing the number of claw-shaped magnetic poles while making the field magnet the same structure. It has become.

Japanese Utility Model Publication No. 5-43749

  However, in a motor employing the above-described rotor, if the number of stator poles (number of slots) is changed as the number of rotor poles changes, for example, not only the shape of the stator core (number of teeth, etc.) but also the coil It is necessary to change the winding mode and the like. Therefore, in a motor that employs a rotor with a Landel structure, there is a demand for a motor that can easily change not only the rotor but also the number of poles of the stator.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a motor in which the number of poles can be easily changed.

In order to solve the above-mentioned problem, the invention according to claim 1 includes a first rotor core having a plurality of first claw-shaped magnetic poles at equal intervals in the circumferential direction and a plurality of second claw-shaped magnetic poles at equal intervals in the circumferential direction. A second rotor core; and a field magnet disposed between the rotor cores, wherein the first and second claw-shaped magnetic poles are alternately disposed in a circumferential direction, and the field magnet includes the first and second claws. In a motor using a rotor in which the magnetic poles are configured as different magnetic poles, the stator includes a first stator core having a plurality of first claw-shaped magnetic poles at equal intervals in the circumferential direction and a plurality of second claw-shaped magnetic poles at equal intervals in the circumferential direction. A second stator core having a coil portion disposed between the stator cores, and alternately arranging the first and second claw-shaped magnetic poles on the stator side in the circumferential direction and the first and second on the rotor side. To the coil part facing the claw-shaped magnetic pole It consists of the first and second claw-shaped magnetic poles of the stator side on the basis of the energization so that the polarity is switched at different magnetic poles, the set of the coil portion and the stator core, and the set of the field magnet and the rotor core Both of them are arranged in multiple stages in the axial direction, and each of the stator core and the rotor core is arranged in such a manner as to be shifted in the circumferential direction between the cores of the respective stages .

  In the present invention, the stator side has a similar Landell type (claw pole type) structure for a motor employing a so-called Landel type rotor. In such a configuration, even on the stator side, the number of poles can be easily changed by changing the number of first and second claw-shaped magnetic poles while having the same coil portion configuration. That is, since the rotor and the stator can have the same configuration of field members (field magnets, coil portions) and the number of poles can be changed without significant design change, a motor that can easily change the number of poles can be configured. .

In the present invention, both the coil portion and the stator core group and the field magnet and rotor core group are arranged in multiple stages in the axial direction . In such a configuration, the amount of magnetic flux handled by each of the claw-shaped magnetic poles of the rotor and the stator is reduced, so that magnetic saturation generated in a part of the claw-shaped magnetic poles is reduced. As a result, the effective magnetic flux generated on the opposing surface of the claw-shaped magnetic pole is increased, which can contribute to higher output of the motor.

In the present invention, each of the stator core and the rotor core is arranged in such a manner that it is shifted in the circumferential direction between the cores of the respective stages, so that the phase of the cogging torque generated in the cores of the respective stages is shifted. Therefore, the cogging torques that are out of phase can be canceled out, and the combined cogging torque can be reduced to suppress the occurrence of vibration.

Invention according to claim 2, in the motor according to claim 1, wherein the coil portion comprises two coils which are disposed between the first stator second stator core, said each coil The gist of the invention is that the polarity of the claw-shaped magnetic poles of each stator core can be switched based on the energization of two-phase driving power having a predetermined phase difference.

  In this invention, it is comprised so that the polarity of the claw-shaped magnetic pole of each stator core may be switched based on the two-phase drive power of the predetermined phase difference to the two coils provided in the coil section. In such a configuration, it is easy to change the magnetic pole in a motor including a two-phase driven stator.

According to a third aspect of the present invention, in the motor according to the first or second aspect , in the stator, three sets of the coil portion and the stator core are arranged along the axial direction, and each of the sets of the coil portions is provided. The gist of the invention is that the polarity of the claw-shaped magnetic poles of each stator core can be switched based on the energization of three-phase driving power with a predetermined phase difference.

  In the present invention, the stator is provided with three pairs of stator cores each having a coil portion interposed therebetween, and the claw of each stator core based on energization of three-phase driving power with a predetermined phase difference to each set of coil portions. The magnetic poles are configured to be switched in polarity. With such a configuration, it is possible to easily change the magnetic pole in a motor including a three-phase drive stator. Further, since the amount of magnetic flux handled individually by the claw-shaped magnetic poles of each phase is reduced, the magnetic saturation generated in a part of the claw-shaped magnetic poles is reduced. As a result, the effective magnetic flux generated on the surface of the claw-shaped magnetic pole facing the rotor increases, which can contribute to higher output of the motor.

  According to the present invention, it is possible to provide a motor whose number of poles can be easily changed.

Sectional drawing of the motor of 1st Embodiment. Similarly, the exploded perspective view of a rotor. Similarly, an exploded perspective view of a stator. Sectional drawing of the motor of 2nd Embodiment. The exploded perspective view of a stator similarly. Sectional drawing of the motor of 3rd Embodiment. Sectional drawing of the motor of 4th Embodiment. The perspective view of the rotor which shows another example of 4th Embodiment. Explanatory drawing for demonstrating the structure of the stator of 5th Embodiment. The perspective view of the motor of 6th Embodiment. Similarly, the perspective view of a single motor. Similarly, the front view seen from the axial direction of the single motor. Similarly, the sectional view taken along the line A-B-C in FIG. Similarly, the whole perspective view of a rotor. Similarly, the front view seen from the radial direction of the rotor. Similarly, the perspective view of a single rotor. Similarly, the exploded perspective view of a single rotor. Similarly, the whole perspective view of a stator. Similarly, sectional drawing of a stator. Similarly, the perspective view of a single stator. Similarly, the exploded perspective view of a single stator. The perspective view of the motor of 7th Embodiment. Similarly, the perspective view of a single motor. Similarly, the front view seen from the axial direction of the single motor. Similarly, the sectional view taken along the line A-B-C in FIG. Similarly, the whole perspective view of a rotor. Similarly, the perspective view of a single rotor. Similarly, the whole perspective view of a stator. Similarly, the perspective view of a single stator. Similarly, the graph which shows the comparison of the torque with respect to the length of a claw-shaped magnetic pole in a rotor and a stator.

(First embodiment)
A first embodiment of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 to 3, the motor 10 includes a stator 11 that generates a rotating magnetic field by energization, and a rotor 12 that is disposed inside the stator 11 and is rotated by receiving the rotating magnetic field.

First, the rotor 12 will be described with reference to FIGS. 1 and 2. The rotor 12 includes first and second rotor cores 13, 14, an annular magnet 15, and a rotating shaft 16.
The first rotor core 13 has five first claw-shaped magnetic poles 22 projecting radially outward with respect to the first core base 21 and extending in the axial direction on the outer periphery of the substantially disk-shaped first core base 21. Has been. The circumferential end surface 22a of the first claw-shaped magnetic pole 22 forms a flat surface extending in the axial direction and the radial direction, and the first claw-shaped magnetic pole 22 has a fan shape when viewed in the axial direction. Further, the circumferential width (angle) of each first claw-shaped magnetic pole 22 is set smaller than the width (angle) of the gap between the first claw-shaped magnetic poles 22 adjacent in the circumferential direction. The second rotor core 14 has the same shape as the first rotor core 13, and includes five second claw-shaped magnetic poles 24 on the second core base 23.

  The first and second rotor cores 13 and 14 are combined such that the claw-shaped magnetic poles 22 and 24 face each other in the axial direction and the claw-shaped magnetic poles 22 and 24 are combined alternately. A predetermined gap is set between the circumferential end faces 22 a and 24 a of the first and second claw-shaped magnetic poles 22 and 24. An annular magnet 15 as a field magnet having the same outer diameter as that of the core bases 21 and 23 is sandwiched between the first and second core bases 21 and 23. For example, a neodymium magnet is used as the annular magnet 15. The rotating shaft 16 is inserted and fixed in insertion holes 13 a, 14 a, 15 a provided in the central portions of the rotor cores 13, 14 and the annular magnet 15, thereby configuring the rotor 12.

  As described above, the rotor 12 of the present embodiment is a so-called Landel type having 10 poles in which the first and second claw-shaped magnetic poles 22 and 24 are different from each other by the annular magnet 15 between the first and second rotor cores 13 and 14. It is configured as a structured rotor.

  Next, the stator 11 will be described with reference to FIGS. 1 and 3. The stator 11 includes first and second stator cores 31 and 32 and a coil portion 33 having first and second coils 34 and 35. .

  The first stator core 31 is formed in a bottomed cylindrical shape including a first core base 36 formed in an annular shape and a cylindrical portion 37 extending in the axial direction from the outer peripheral portion of the first core base 36. ing. The first core base 36 has six first claw-shaped magnetic poles 38 formed on the annular inner periphery. The first claw-shaped magnetic pole 38 is formed so as to extend in the axial direction from the first core base 36, and is formed so that the circumferential width becomes smaller toward the tip. Further, the first claw-shaped magnetic pole 38 has an angle formed by the circumferential end surface 38a on one side in the circumferential direction (counterclockwise in FIG. 3) and the axial direction larger than the circumferential end surface 38b on the other side. Is formed. The cylindrical portion 37 is provided with a notch portion 37a for taking out the terminal attachment portion 33b (see FIG. 3) of the coil portion 33. The first and second coils 34 and 35 of the coil portion 33 are accommodated in a portion surrounded by the first core base 36 and the cylindrical portion 37.

  The first coil 34 includes an annular coil bobbin 34 a whose outer diameter is set to be substantially the same as the outer diameter of the first core base 36. The coil bobbin 34a has a U-shaped cross section along the radial direction. The first coil 34 is configured by winding a winding 34b around a coil bobbin 34a in an annular shape. A second coil 35 is provided on the first core base 36 side of the first coil 34. The second coil 35 has the same configuration as the first coil 34, and is configured by winding a winding 35b around a coil bobbin 35a.

  The second stator core 32 is provided so as to close the upper opening of the first stator core 31 in which the coils 34 and 35 are accommodated. The second stator core 32 includes an annular second core base 39, and a second claw-shaped magnetic pole 41 is formed on the inner periphery of the second core base 39. The second claw-shaped magnetic pole 41 has a symmetrical shape with the first claw-shaped magnetic pole 38 of the first stator core 31, and an angle formed by the circumferential end surface 41a on one side in the circumferential direction (counterclockwise in FIG. 3) with the axial direction. However, it is formed so as to be larger than the other circumferential end surface 41b side.

  The first and second stator cores 31 and 32 are inserted into the through-holes 33a of the coil portion 33 so that the protruding sides of the claw-shaped magnetic poles 38 and 41 face each other, and the claw-shaped magnetic poles 38 and 41 are arranged in the circumferential direction. Combined to alternate. Further, the coil part 33 (coils 34 and 35) is sandwiched between the first and second core bases 36 and 39. Incidentally, the coil portion 33 is provided with a terminal attachment portion 33b on one axial side of the coil bobbin 34a of the first coil 34. Three terminals 33c are respectively attached to the terminal attachment portion 33b, and end points and common points of the windings 34b and 35b of the coils 34 and 35 are connected to the terminals 33c.

  As described above, the stator 11 according to the present embodiment has 12 poles that excite the first and second claw-shaped magnetic poles 38 and 41 to different magnetic poles from time to time at the coil portion 33 between the first and second stator cores 31 and 32. The so-called Randel type (claw pole type) stator is constructed. The stator 11 is a two-phase driven stator in which a pulsed drive current having a predetermined phase difference is sequentially supplied to the first and second coils 34 and 35 (windings 34b and 35b) via a terminal 33c. It has become. In the stator 11, the rotor 12 is driven to rotate by switching the polarities of the claw-shaped magnetic poles 38 and 41 at a predetermined timing.

  By the way, in the motor 10 of this embodiment, when there is a request for changing the number of magnetic poles, the rotor 12 has a Landel structure, so the number of claw-shaped magnetic poles 22 and 24 is changed while the annular magnet 15 is made the same structure. By doing so, it is easy to change the number of poles. Further, since the stator 11 has a Landel type (claw pole type) structure similar to that of the rotor 12, the number of poles can be changed by changing the number of claw-shaped magnetic poles 38 and 41 while making the coil part 33 the same structure. It is easy to change. That is, the motor 10 according to the present embodiment has a configuration that can easily cope with a specification change in which the number of magnetic poles of the rotor 12 and the stator 11 are variously combined without a significant design change.

Next, characteristic effects of the present embodiment will be described.
(1) The motor 10 of this embodiment is a motor that employs a so-called Landel-type rotor 12, and the stator 11 side also has a similar Landell-type (claw pole type) structure. In such a configuration, also on the stator 11 side, the number of poles can be easily changed by changing the number of first and second claw-shaped magnetic poles 38 and 41 while making the coil portion 33 the same configuration. That is, since the rotor 12 and the stator 11 can be changed in the number of poles without making a significant design change with the field members (the annular magnet 15 and the coil portion 33) having the same configuration, the number of poles can be easily changed. 10 can be configured.

  (2) By sequentially supplying a two-phase drive current having a predetermined phase difference to the first and second coils 34 and 35 (windings 34b and 35b) included in the coil unit 33, each claw-shaped magnetic pole 38, The polarity of 41 is switched. That is, it is easy to change the magnetic pole in the motor including the two-phase driven stator 11.

  (3) In the stator 11, the coils 34 and 35 are wound around the axis of the motor 10 (circumferential direction) in an annular shape. In such a configuration, the height (axial length) of the stator 11 can be configured to be equivalent to that of the rotor 12 (since no so-called coil end portion is generated), which contributes to miniaturization of the motor 10 particularly in the axial direction. Can do.

  (4) As for the 1st and 2nd stator cores 31 and 32, each claw-shaped magnetic pole 38 and 41 has a large angle which one circumferential direction end surface 38a and 41a makes with an axial direction compared with the other circumferential direction end surface 38b and 41b. It is formed asymmetrically. The stator 11 is assembled with the stator cores 31 and 32 such that the circumferential end faces 38a and 41a having a large inclination angle are on the counterclockwise side. In such a configuration, when the rotation direction of the rotor 12 is set as the clockwise direction, the end surfaces (end surfaces 43a and 41a) having the large inclination angles of the claw-shaped magnetic poles 38 and 41 are rear end sides (counterclockwise) in the rotation direction. The direction of the cogging torque can be reduced.

(Second Embodiment)
Next, a second embodiment of the present invention will be described.
As shown in FIGS. 4 and 5, the stator 51 of the motor 50 has a three-stage structure in which a U-phase stator portion 51u, a V-phase stator portion 51v, and a W-phase stator portion 51w are stacked in the axial direction. From the bottom to the top, for example, the W-phase stator portion 51w, the V-phase stator portion 51v, and the U-phase stator portion 51u are arranged in this order.

  The lower W-phase stator portion 51 w has a configuration in which one coil portion 54 is sandwiched between a first stator core 52 a having a first claw-shaped magnetic pole 38 and a second stator core 53 a having a second claw-shaped magnetic pole 41. The first stator core 52a has a cylindrical portion 37 and is configured to accommodate the V-phase stator portion 51v and the U-phase stator portion 51u in addition to the coil portion 54 and the second stator core 53a of the W-phase stator portion 51w. .

  The middle V-phase stator portion 51v and the upper U-phase stator portion 51u have the same configuration. The V-phase stator portion 51v has a configuration in which one coil portion 54 is sandwiched between a first stator core 52b having a first claw-shaped magnetic pole 38 and a second stator core 53b having a second claw-shaped magnetic pole 41. The U-phase stator portion 51u has a configuration in which one coil portion 54 is sandwiched between a first stator core 52c having a first claw-shaped magnetic pole 38 and a second stator core 53c having a second claw-shaped magnetic pole 41.

  Then, a pulsed drive current (three-phase current) having a predetermined phase difference is sequentially supplied to each phase terminal 54 b supported by the terminal mounting portion 54 a of the U-phase, V-phase, and W-phase coil portions 54. Thus, the claw-shaped magnetic poles 38, 41 of the stator portions 51u, 51v, 51w of each phase are switched to different magnetic poles at the timing of each phase.

  Thus, according to the present embodiment, the magnetic pole can be easily changed in the motor 50 including the three-phase drive stator 51. Moreover, in such a structure, the magnetic flux density in the claw-shaped magnetic poles 38 and 41 can be made uniform by dividing the amount of magnetic flux generated from the entire coil portion.

(Third embodiment)
Next, a third embodiment of the present invention will be described.
As shown in FIG. 6, the stator 61 of the motor 60 has a configuration in which one coil portion 62 is sandwiched between first and second stator cores 63 and 64 having claw-shaped magnetic poles 38 and 41 (corresponding to FIG. 3).

In such a configuration, the number of parts constituting the stator 61 can be reduced.
Further, from the viewpoint of increasing the effective magnetic flux, the stator 61 shown in FIG. 6 has a configuration in which one coil portion 62 faces the rotor 12, and the cross-sectional area of each claw-shaped magnetic pole 41 is narrowed. There is a possibility that the magnetic flux density of the magnetic flux generated from the coil portion 62 increases in the vicinity (portion surrounded by a broken line in the figure), and magnetic saturation occurs. As a result, there is a concern that the effective magnetic flux generated on the surface 41c of the claw-shaped magnetic pole 41 facing the rotor 12 is reduced. On the other hand, when the stator 51 is configured in multiple stages with the stator portions 51u, 51v, 51w driven in three phases as in the motor 50 of the second embodiment shown in FIG. Since the amount of magnetic flux handled individually is reduced, magnetic saturation generated in a part of the claw-shaped magnetic pole 41 is reduced. As a result, the effective magnetic flux generated on the surface 41c facing the rotor 12 is increased, which can contribute to higher output of the motor.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described.
As shown in FIG. 7, the stator 71 of the motor 70 is configured by laminating two sets of a U-phase stator portion 51 u, a V-phase stator portion 51 v, and a W-phase stator portion 51 w, for a total of six stages, and faces the stator 71. Thus, the rotor 72 comprises the first and second rotors 12a and 12b in a two-stage structure.

  The rotor 72 shown in FIG. 7 is fixed to the rotating shaft 16 so that the first and second rotors 12a and 12b overlap each other. The first rotor 12 a is configured to sandwich the annular magnet 15 between a first rotor core 74 a having a first claw-shaped magnetic pole 73 and a second rotor core 76 a having a second claw-shaped magnetic pole 75. The second rotor 12 b is configured to sandwich the annular magnet 15 between a first rotor core 74 b having a first claw-shaped magnetic pole 73 and a second rotor core 76 b having a second claw-shaped magnetic pole 75.

  The first and second rotors 12a and 12b are arranged such that the second rotor cores 76a and 76b having the same polarity are in contact with each other, and the first and second claw-shaped magnetic poles 73 and 75 having the same polarity are overlapped in the axial direction. ing.

  In such a configuration, the sets of the stator cores 52a to 52c, 53a to 53c and the coil portion 54, and the sets of the rotor cores 74a, 76a, 74b and 76b and the annular magnet 15 are arranged in multiple stages along the axial direction.

  Accordingly, the amount of magnetic flux handled by each of the claw-shaped magnetic poles 73, 75, 41, and 38 (not shown) of the rotor 72 and the stator 71 is reduced, so that magnetic saturation caused by the claw-shaped magnetic poles is reduced. As a result, the effective magnetic flux generated on the opposing surface 38c (see FIG. 5) of the claw-shaped magnetic poles 38, 41, 73, and 75 and the opposing surfaces 41c, 73a, and 75a increases, thereby contributing to higher output of the motor. be able to.

Note that only one of the stator 71 and the rotor 72 may be multistage.
Further, in a rotor having a multi-stage structure such as the rotor 72 shown in FIG. 7, for example, as shown in FIG. 8, the rotors 12a and 12b at each stage may be shifted in the circumferential direction. In the rotor 72a shown in FIG. 8, the first and second rotors 12a and 12b are arranged so that the rotor cores of the same magnetic pole are adjacent to each other, and between the rotors 12a and 12b (between the claw-shaped magnetic poles 73 and 75). It arrange | positions in the aspect shifted | deviated by the predetermined angle (alpha) r in the circumferential direction.

  In such a configuration, the phase of the cogging torque generated in the first and second rotors 12a and 12b is shifted. Therefore, the cogging torques that are out of phase can be canceled out, and the combined cogging torque can be reduced to suppress the occurrence of vibration.

  Incidentally, in the rotor 72a shown in FIG. 8, adjacent to the claw-shaped magnetic poles 73 and 75, the auxiliary magnets (the back-side auxiliary magnet 78 on the back surface of the claw-shaped magnetic poles 73 and 75 and the gap between the claw-shaped magnetic poles 73 and 75). A magnet 79) is provided to reduce leakage magnetic flux.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described.
As shown in FIG. 9, the stator 71 a of this embodiment is a stator like the stator 51 of the second embodiment shown in FIG. 4, in which the stator cores 52 a to 52 c and 53 a to 53 c of each stage are shifted in the circumferential direction. It is the composition.

  That is, the stator 71a shown in FIG. 9 is laminated in such a manner that the stator cores 52a to 52c and 53a to 53c are shifted in the circumferential direction. The second-stage stator cores 52b and 53b are arranged so as to be shifted from the first-stage stator cores 52a and 53a by a predetermined angle αs on the one side in the circumferential direction from the electrical angle 120 ° at the normal position. Similarly, the third-stage stator cores 52c and 53c are arranged so as to be shifted from the second-stage stator cores 52b and 53b by a predetermined angle αs on the one side in the circumferential direction from the electrical angle 120 ° at the normal position.

Even in such a configuration, similarly to the rotor 72a shown in FIG. 8, the combined cogging torque can be reduced to suppress the occurrence of vibration.
In addition, you may comprise a motor combining the rotor 72a shown in FIG. 8, and the stator 71a shown in FIG. In this case, the predetermined angles αr and αs are set to angles that are relatively shifted.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described with reference to FIGS.
FIG. 10 shows an overall perspective view of the brushless motor M of the present embodiment, and an annular stator 90 fixed to a motor housing (not shown) is attached to the outside of the rotor 80 fixed to a rotating shaft (not shown). Is arranged.

The brushless motor M is formed by stacking three single motors Ma shown in FIGS. 11 to 13 in the axial direction. In FIG. 10, the U-phase motor unit Mu, the V-phase motor unit Mv, and the W-phase motor unit Mw are arranged from the top. It is configured in the order.
(Rotor 80)
As shown in FIGS. 14 and 15, the rotor 80 is composed of a U-phase rotor 80 u, a V-phase rotor 80 v, and a W-phase rotor 80 w. The rotors 80u, 80v, and 80w of each phase have the same configuration, and are composed of first and second rotor cores 81 and 82 and an annular magnet 83, as shown in FIGS.

(First rotor core 81)
As shown in FIG. 17, the first rotor core 81 has a first rotor core base 84 formed in an annular plate shape. A through hole 81 a is formed at the center position of the first rotor core base 84 to penetrate and fix a rotating shaft (not shown). In addition, twelve first rotor-side claw-shaped magnetic poles 85 are projected on the outer peripheral surface of the first rotor core base 84 at equal intervals, projecting outward in the radial direction, and the tips thereof are bent to extend toward the second rotor core 82 in the axial direction. Has been formed.

  The circumferential end surfaces 85a and 85b of the first rotor-side claw-shaped magnetic pole 85 are flat surfaces extending in the radial direction (not inclined with respect to the radial direction when viewed from the axial direction), and are the first rotor-side claw-shaped magnetic poles. 85 has a fan-shaped cross section in the direction perpendicular to the axis.

  The circumferential angle of each first rotor-side claw-shaped magnetic pole 85, that is, the angle between the circumferential end surfaces 85 a and 85 b and the central axis of the rotation axis (not shown) is the adjacent first rotor-side claw-shaped magnetic pole 85. And the first rotor side claw-shaped magnetic pole 85 is set to be smaller than the angle of the gap.

(Second rotor core 82)
As shown in FIG. 17, the second rotor core 82 is made of the same material and shape as the first rotor core 81, and has a rotation shaft (see FIG. A through hole 82a is formed for passing through and fixing (not shown). In addition, twelve second rotor side claw-shaped magnetic poles 87 are projected on the outer peripheral surface of the second rotor core base 86 at equal intervals, projecting outward in the radial direction, and bent at the tips thereof, extending to the axial first rotor core 81 side. Has been formed.

The circumferential end surfaces 87a and 87b of the second rotor-side claw-shaped magnetic pole 87 are flat surfaces extending in the radial direction, and the second rotor-side claw-shaped magnetic pole 87 is formed in a sector shape in the cross-axis direction.
The circumferential angle of each second rotor-side claw-shaped magnetic pole 87, that is, the angle between the circumferential end surfaces 87a, 87b and the central axis of the rotation shaft (not shown) is the adjacent second rotor-side claw-shaped magnetic pole 87. And the angle of the gap between the second rotor side claw-shaped magnetic pole 87 is set smaller.

  In the second rotor core 82, the second rotor-side claw-shaped magnetic pole 87 of the second rotor core 82 is compared with the first rotor core 81 in the first rotor-side claw-shaped magnetic pole 85 of the first rotor core 81 when viewed from the axial direction. The arrangement is fixed so as to be located between them. At this time, the second rotor core 82 is assembled to the first rotor core 81 such that the annular magnet 83 is disposed between the first rotor core 81 and the second rotor core 82 in the axial direction.

  More specifically, as shown in FIGS. 13 and 17, the annular magnet 83 includes a surface (opposing surface 84 a) of the first rotor core base 84 on the second rotor core base 86 side and the first rotor core base 84 of the second rotor core base 86. It is sandwiched between the side surfaces (opposing surface 86a).

  At this time, one circumferential end surface 85a of the first rotor side claw-shaped magnetic pole 85 and the other circumferential end surface 87b of the second rotor side claw-shaped magnetic pole 87 are formed so as to be parallel to each other along the axial direction. Therefore, the gap between both end faces 85a and 87b is formed so as to be substantially linear along the axial direction. Further, the other circumferential end surface 85b of the first rotor-side claw-shaped magnetic pole 85 and one circumferential end surface 87a of the second rotor-side claw-shaped magnetic pole 87 are formed in parallel along the axial direction. Therefore, the gap between both end faces 85b and 87a is formed so as to be substantially linear along the axial direction.

(Annular magnet 83)
In the present embodiment, the annular magnet 83 is an annular plate-shaped permanent magnet made of a neodymium magnet. As shown in FIG. 17, the annular magnet 83 has a through hole 83 a that passes through a rotation shaft (not shown) at the center position. Then, one side surface 83b of the annular magnet 83 abuts the opposing surface 84a of the first rotor core base 84 and the other side surface 83c of the annular magnet 83 abuts on the opposing surface 86a of the second rotor core base 86, respectively. Is fixed between the first rotor core 81 and the second rotor core 82.

The outer diameter of the annular magnet 83 is set to coincide with the outer diameters of the first and second rotor core bases 84 and 86, and the thickness is set to a predetermined thickness.
That is, as shown in FIG. 13, the annular magnet 83 is disposed between the first rotor core 81 and the second rotor core 82. At this time, the front end surface 85c of the first rotor side claw-shaped magnetic pole 85 and the opposite surface 86b of the second rotor core base 86 are flush with each other, and the front end surface 87c of the second rotor side claw-shaped magnetic pole 87 and the first rotor core. The opposite surface 84b of the base 84 is flush with the surface.

  As shown in FIG. 13, the annular magnet 83 is magnetized in the axial direction, and is magnetized so that the first rotor core 81 side is an N pole and the second rotor core 82 side is an S pole. Accordingly, the annular magnet 83 causes the first rotor side claw-shaped magnetic pole 85 of the first rotor core 81 to function as an N pole (first magnetic pole), and the second rotor side claw-shaped magnetic pole 87 of the second rotor core 82 serves as the S pole ( Functions as a second magnetic pole).

  The U-phase rotor 80u, the V-phase rotor 80v, and the W-phase rotor 80w configured as described above are so-called Landel type rotors using the annular magnet 83. In each of the rotors 80u, 80v, and 80w, the first rotor side claw-shaped magnetic poles 85 that are N poles and the second rotor side claw-shaped magnetic poles 87 that are S poles are alternately arranged in the circumferential direction, and the number of magnetic poles is 24. The rotor has 12 poles (the number of pole pairs is 12).

  The U-phase, V-phase, and W-phase rotors 80u, 80v, and 80w are laminated in the axial direction as shown in FIG. At this time, as shown in FIG. 14 and FIG. 15, with respect to the rotor 80 including the U-phase, V-phase, and W-phase rotors 80 u, 80 v, and 80 w, the U-phase rotor 80 u, V-phase rotor 80 v, and W-phase rotor 80 w Are stacked with a phase shift of 120 degrees.

More specifically, the V-phase rotor 80v is fixed to the rotation shaft with a phase shift of 120 degrees in the clockwise direction with respect to the U-phase rotor 80u. The W-phase rotor 80w is fixed to the rotary shaft with a phase shift of 120 degrees in the clockwise direction with respect to the V-phase rotor 80v.
(Starter 90)
As shown in FIGS. 18 and 19, the stator 90 disposed on the outer side in the radial direction of the rotor 80 includes three components, a U-phase stator 90 u, a V-phase stator 90 v, and a W-phase stator 90 w. The stators 90u, 90v, 90w of each phase are configured to be sequentially laminated in the axial direction so as to face the corresponding U-phase rotor 80u, V-phase rotor 80v, and W-phase rotor 80w in the radial direction.

The stators 90u, 90v, 90w of each phase have the same configuration, and are constituted by first and second stator cores 91, 92 and a coil portion 93 as shown in FIGS.
(First stator core 91)
As shown in FIG. 21, the first stator core 91 has an annular plate-shaped first stator core base 94, and a cylindrical cylindrical wall 94 c is formed on the outer periphery of the first stator core base 94 in the second axial direction. Extending toward the stator core 92 side.

Further, twelve first stator side claw-shaped magnetic poles 95 are formed on the inner peripheral portion of the first stator core base 94 so as to extend at equal intervals toward the second stator core 92 in the axial direction.
The circumferential end surfaces 95a and 95b of the first stator side claw-shaped magnetic pole 95 are flat surfaces, and the first stator side claw-shaped magnetic pole 95 is formed in a fan-shaped cross section in the direction perpendicular to the axis.

The circumferential angle of each first stator side claw-shaped magnetic pole 95, that is, the angle formed between the circumferential end faces 95 a and 95 b with the central axis of the rotating shaft (not shown) is the adjacent first stator side claw-shaped magnetic pole 95. And the first stator claw-shaped magnetic pole 95 is set to be smaller than the angle of the gap.
(Second stator core 92)
As shown in FIG. 21, the second stator core 92 has an annular plate-like second stator core base 96 having the same material and shape as the first stator core base 94. The outer periphery of the second stator core base 96 is in contact with the annular tip surface of the cylindrical wall 94 c formed on the first stator core 91.

In addition, twelve second stator side claw-shaped magnetic poles 97 are formed at equal intervals on the inner peripheral portion of the second stator core base 96 so as to extend toward the first stator core 91 at equal intervals.
The circumferential end surfaces 97a, 97b of the second stator side claw-shaped magnetic pole 97 are flat surfaces, and the second stator side claw-shaped magnetic pole 97 is formed in a fan-shaped cross section in the direction perpendicular to the axis.

  The angle in the circumferential direction of each second stator side claw-shaped magnetic pole 97, that is, the angle between the circumferential end surfaces 97 a, 97 b and the central axis of the rotating shaft (not shown) is the adjacent second stator side claw-shaped magnetic pole 97. Is set smaller than the angle of the gap between the second stator side claw-shaped magnetic pole 97.

That is, the shape of the second stator core 92 is the same as the shape of the first stator core 91 when the cylindrical wall 94c is omitted.
In the second stator core 92, the second stator side claw-shaped magnetic pole 97 of the second stator core 92 has a first stator side claw-shaped magnetic pole 95 of the first stator core 91 as viewed from the axial direction. The arrangement is fixed so as to be located between them.

  The second stator core 92 is assembled to the first stator core 91 such that the coil portion 93 is disposed between the first stator core 91 and the second stator core 92 in the axial direction.

  Specifically, as shown in FIGS. 13 and 21, the coil portion 93 includes a surface (opposing surface 94 a) of the first stator core base 94 on the second stator core base 96 side and the first stator core base 94 of the second stator core base 96. It is sandwiched between the side surfaces (opposing surface 96a).

  At this time, one circumferential end surface 95a of the first stator side claw-shaped magnetic pole 95 and the other circumferential end surface 97b of the second stator side claw-shaped magnetic pole 97 are formed so as to be parallel to each other along the axial direction. Therefore, the gap between both end faces 95a and 97b is formed so as to be substantially linear along the axial direction. Further, the other circumferential end surface 95b of the first stator side claw-shaped magnetic pole 95 and one circumferential end surface 97a of the second stator side claw-shaped magnetic pole 97 are formed so as to be parallel along the axial direction. Therefore, the gap between both end faces 95b and 97a is formed so as to be substantially linear along the axial direction.

(Coil part 93)
As shown in FIG. 13, the coil portion 93 has an annular winding 98, and the annular winding 98 is housed in an annular coil bobbin 99. The coil bobbin 99 is formed in a U-shaped cross-sectional shape having an opening in the radial direction. The outer diameter of the coil bobbin 99 is formed substantially the same as the inner diameter of the cylindrical wall 94c of the first stator core 91, and the outer peripheral surface in the radial direction of the coil bobbin 99 is disposed so as to contact the inner peripheral surface of the cylindrical wall 94c. The inner diameter of the coil bobbin 99 is formed substantially the same as the outer diameter of the first stator side claw-shaped magnetic pole 95 (second stator side claw-shaped magnetic pole 97), and the radially inner front end surface of the coil bobbin 99 is the first stator side claw-shaped magnetic pole 95. And it is arrange | positioned so that the outer surface of the 2nd stator side claw-shaped magnetic pole 97 may be contact | abutted.

  Further, the outer surface of the coil bobbin 99 on the first stator core 91 side is in contact with the facing surface 94a of the first stator core base 94, and the outer surface of the coil bobbin 99 on the second stator core 92 side is in the axial direction. The second stator core base 96 comes into contact with the facing surface 96a.

The thickness (axial length) of the coil bobbin 99 is set to a predetermined thickness in accordance with the axial length of the first stator side claw-shaped magnetic pole 95 (second stator side claw-shaped magnetic pole 97). ing.
That is, as shown in FIG. 13, a coil bobbin 99 having an annular winding 98 is disposed between the first stator core 91 and the second stator core 92. At this time, the front end surface 95c of the first stator side claw-shaped magnetic pole 95 and the opposite surface 96b of the second stator core base 96 are flush with each other, and the front end surface 97c of the second stator side claw-shaped magnetic pole 97 and the first stator core base The counter-facing surface 94b of 94 is flush with the surface.

  At this time, the length in the axial direction from the anti-facing surface 94b of the first stator core base 94 to the anti-facing surface 96b of the second stator core base 96 is such that the anti-facing surface 84b of the first rotor core base 84 extends to the second rotor core base 86. It is made to correspond with the length of the axial direction to the anti-opposing surface 86b.

  Therefore, the axial length of the first stator side claw-shaped magnetic pole 95 (second stator side claw-shaped magnetic pole 97) is the axial length of the first rotor side claw-shaped magnetic pole 85 (second rotor side claw-shaped magnetic pole 87). Match the length.

  In FIG. 21, for convenience of explanation, the drawing terminal of the annular winding 98 and the terminal mounting portion of the coil bobbin 99 are omitted in the drawing. In accordance with this, a notch for leading the terminal mounting portion formed on the cylindrical wall 94c of the first stator core 91 to the outside is omitted in the drawing.

  The U-phase, V-phase, and W-phase stators 90u, 90v, and 90w configured as described above are claw-shaped magnetic poles on the first and second stator sides by the annular winding 98 between the first and second stator cores 91 and 92. Thus, a stator having a so-called Randel type (claw pole type) structure with 24 poles that excites 95 and 97 to different magnetic poles from time to time. The U-phase, V-phase, and W-phase stators 90u, 90v, and 90w are stacked in the axial direction to form the stator 90, as shown in FIGS.

  At this time, as shown in FIG. 18 and FIG. 19, the U-phase stator 90u, the V-phase stator 90v, and the W-phase stator 90w are electrically connected to the stator 90 including the U-phase, V-phase, and W-phase stators 90u, 90v, and 90w. The layers are stacked with the phase shifted by 120 degrees.

  More specifically, the V-phase stator 90v is fixed to a motor housing (not shown) with an electrical angle shifted by 120 degrees in the clockwise direction with respect to the U-phase stator 90u. The W-phase stator 90w is fixed to the motor housing with a phase difference of 120 degrees in the clockwise direction with respect to the V-phase stator 90v.

  In other words, the circumferential displacement between the first and second rotor-side claw-shaped magnetic poles 85 and 87 of each phase opposite to the first and second stator-side claw-shaped magnetic poles 95 and 97 of each phase is mutually opposite on the opposing surface. Inclined in the same direction.

  The U-phase power supply voltage of the three-phase AC power supply is applied to the annular winding 98 of the U-phase stator 90u, and the V-phase power supply voltage of the three-phase AC power supply is applied to the annular winding 98 of the V-phase stator 90v. A W-phase power supply voltage of a three-phase AC power supply is applied to the annular winding 98 of the W-phase stator 90w.

Next, the operation of the brushless motor M configured as described above will be described.
Now, a three-phase AC power supply voltage is applied to the stator 90. That is, the U-phase power supply voltage is applied to the annular winding 98 of the U-phase stator 90u, the V-phase power supply voltage is applied to the annular winding 98 of the V-phase stator 90v, and the W-phase power supply is applied to the annular winding 98 of the W-phase stator 90w. Each voltage is applied. As a result, a rotating magnetic field is generated in the stator 90, and the rotor 80 is rotationally driven.

  At this time, the stator 90 has a three-stage structure including U-phase, V-phase, and W-phase stators 90u, 90v, and 90w in accordance with a three-phase AC power source. Correspondingly, the rotor 80 has the same three-stage structure as the U-phase, V-phase, and W-phase rotors 80u, 80v, and 80w. Thereby, in the stator and rotor of each phase, the stator facing each other in the axial direction can receive the magnetic flux of the annular magnet 83, and the output can be increased.

  Further, the U-phase, V-phase, and W-phase stators 90u, 90v, and 90w of the stator 90 are shifted 120 degrees clockwise in electrical angle, whereas the U-phase, V-phase, and W-phase rotors 80u, 80v and 80w were shifted 120 degrees in the clockwise direction by electrical angle. That is, there is a shift in the circumferential direction between the U-phase, V-phase, and W-phase rotors 80u, 80v, and 80w opposite to the U-phase, V-phase, and W-phase stators 90u, 90v, and 90w. Inclined.

  That is, the movement of the rotor 80 with respect to the switching of the first and second stator side claw-shaped magnetic poles 95 and 97 due to the AC currents flowing through the annular windings 98 of the U-phase, V-phase, and W-phase stators 90u, 90v, and 90w. Since the amount (rotation amount) can be increased, the number of rotations can be increased.

  Further, in the present embodiment as well, in the same manner as in each of the embodiments described above, when there is a request for changing the number of magnetic poles, the U-phase, V-phase, and W-phase rotors 80u, 80v, and 80w of the rotor 80 have a Landel structure. Therefore, the number of poles can be easily changed by changing the number of first and second rotor side claw-shaped magnetic poles 85 and 87 while making the annular magnet 83 the same structure. Similarly, since the U-phase, V-phase, and W-phase stators 90u, 90v, and 90w of the stator 90 have a claw pole type structure, the first and second stator side claws are formed with the coil part 93 having the same structure. By changing the number of magnetic poles 95 and 97, the number of poles can be easily changed.

  That is, the brushless motor of this embodiment has a configuration that can easily cope with a specification change in which the number of magnetic poles of the rotor 80 and the stator 90 are combined in various ways without a significant design change.

Next, effects of the sixth embodiment will be described below.
(1) According to the above embodiment, the stator 90 has a three-stage structure of the U-phase, V-phase, and W-phase stators 90u, 90v, and 90w, and the rotor 80 also corresponds to the U-phase and V-phase. The three-stage structure is the same as the W-phase rotors 80u, 80v, and 80w. Then, a three-phase AC power source was applied to the stator 90. Since the stators and rotors of each phase can individually receive the magnetic flux of the annular magnet 83 along the axial direction, the output of the brushless motor M can be increased.

  (2) According to the above embodiment, between the first and second rotor side claw-shaped magnetic poles 85 and 87 of each phase opposite to the first and second stator side claw-shaped magnetic poles 95 and 97 of each phase, Deviations in the direction were inclined in the same direction on the opposing surface. Therefore, the movement amount (rotation amount) of the rotor 80 with respect to the switching of the first and second stator side claw-shaped magnetic poles 95 and 97 due to each phase alternating current can be increased, and the rotation speed can be increased.

  (3) According to the above-described embodiment, the rotors 80u, 80v, and 80w of each phase of the rotor 80 have a Landell type structure, and the stators 90u, 90v, and 90w of each phase of the stator 90 have a claw pole type structure. Accordingly, by changing the number of the first and second rotor side claw-shaped magnetic poles 85 and 87 and the first and second stator side claw-shaped magnetic poles 95 and 97 while making the annular magnet 83 and the coil portion 93 the same configuration, You can easily change the number. As a result, it is possible to easily cope with a change in the specification of the motor in which the number of magnetic poles of the rotor 80 and the stator 90 are combined with each other without a significant design change.

  (4) According to the above embodiment, each coil portion 93 of each phase stator 90u, 90v, 90w constituting the stator 90 has an annular winding 98 wound around the axis of the brushless motor M (circumferential direction). It is disguised. Therefore, the height (axial length) of the stator 90 can be configured to be equal to that of the rotor 80 (since no so-called coil end portion is generated), and the brushless motor M can be reduced in the axial direction.

(Seventh embodiment)
Next, a seventh embodiment of the present invention will be described with reference to FIGS.
This embodiment is characterized by the first and second rotor side claw-shaped magnetic poles 85 and 87 and the first and second stator side claw-shaped magnetic poles 95 and 97, and the number of stages and the number of poles of the rotor 80 and the stator 90 are as follows. Since the configuration is the same as that of the sixth embodiment, the characteristic portions will be described in detail, and the common portions will be omitted for convenience of description.

  FIG. 22 is an overall perspective view of the brushless motor M of the present embodiment, and an annular stator 90 fixed to a motor housing (not shown) is attached to the outside of the rotor 80 fixed to a rotating shaft (not shown). Has been placed.

  As in the sixth embodiment, the brushless motor M has a single motor Ma shown in FIGS. 23, 24, and 25 stacked in three stages in the axial direction. In FIG. 22, the U-phase motor unit Mu, The V-phase motor unit Mv and the W-phase motor unit Mw are configured in this order.

  26 and 27, first and second rotor side claw-shaped magnetic poles 85, 87 formed on the first and second rotor cores 81, 82 of the U-phase rotor 80u, the V-phase rotor 80v, and the W-phase rotor 80w. The axial length D1 is shorter than that of the sixth embodiment.

  More specifically, in the sixth embodiment, the first and second rotor side claw-shaped magnetic poles 85 and 87 have their front end surfaces 85c and 87c opposite to the opposing surfaces 84b and 84b of the first and second rotor core bases 84 and 86, respectively. It was the same length as 86b.

  On the other hand, in the present embodiment, as shown in FIGS. 25 and 27, the first and second rotor side claw-shaped magnetic poles 85 and 87 have their tip surfaces 85c and 87c respectively corresponding to the first and second rotor cores. The length is flush with the opposing surfaces 84a and 86a of the bases 84 and 86. That is, in this embodiment, the length D1 of the first and second rotor side claw-shaped magnetic poles 85 and 87 is shortened by the thickness in the axial direction of the first and second rotor core bases 84 and 86.

  On the other hand, similarly, as shown in FIGS. 25 and 29, first and second stator side claws formed on the first and second stator cores 91 and 92 of the U-phase stator 90u, the V-phase stator 90v, and the W-phase stator 90w. The axial lengths D2 of the magnetic poles 95 and 97 are both shorter than in the sixth embodiment.

  More specifically, in the sixth embodiment, the first and second stator side claw-shaped magnetic poles 95 and 97 have their front end surfaces 95c and 97c opposite to the opposing surfaces 94b and 94b of the first and second stator core bases 94 and 96, respectively. It was the same length as 96b.

  On the other hand, in the present embodiment, as shown in FIGS. 25 and 27, the first and second stator side claw-shaped magnetic poles 95 and 97 have their front end surfaces 95c and 97c respectively corresponding to the first and second stator cores. The length is flush with the opposing surfaces 94a and 96a of the bases 94 and 96. That is, in this embodiment, the length D2 of the first and second stator side claw-shaped magnetic poles 95, 97 is shortened by the thickness in the axial direction of the first and second stator core bases 94, 96.

Next, the operation of the brushless motor M configured as described above will be described.
When a three-phase AC power supply voltage is applied to the stator 90, the U-phase power supply voltage is applied to the annular winding 98 of the U-phase stator 90u and the annular winding 98 of the V-phase stator 90v is applied to the stator 90v, as in the sixth embodiment. The V-phase power supply voltage is applied to the annular winding 98 of the W-phase stator 90w. As a result, a rotating magnetic field is generated in the stator 90, and the rotor 80 is rotationally driven.

  At this time, the stator 90 has a U-phase, V-phase, and W-phase stators 90u, 90v, and 90w in accordance with a three-phase AC power source, and the rotor 80 also has a U-phase, V-phase, The same three-stage structure as the W-phase rotors 80u, 80v, and 80w was used. Thereby, in the stator and rotor of each phase, the stator facing each other in the axial direction can receive the magnetic flux of the annular magnet 83, and the output can be increased.

In addition, the axial length D2 of the first and second stator side claw-shaped magnetic poles 95, 97 of the U-phase, V-phase, W-phase stators 90u, 90v, 90w having a three-stage structure is shortened.
That is, in the U-phase, V-phase, and W-phase stators 90u, 90v, and 90w, the first stator side claw-shaped magnetic poles 95 are separated from each other, and the second stator-side claw-shaped magnetic poles 97 are separated from each other. As a result, the short circuit of the magnetic flux between the first stator side claw-shaped magnetic poles 95 of each phase is suppressed, and the short circuit of the magnetic flux between the second stator side claw-shaped magnetic poles 97 of each phase is suppressed.

Similarly, the axial length D1 of the first and second rotor side claw-shaped magnetic poles 85, 87 of the U-phase, V-phase, W-phase rotors 80u, 80v, 80w having a three-stage structure is shortened.
That is, in the U-phase, V-phase, and W-phase rotors 80u, 80v, and 80w, the first rotor side claw-shaped magnetic poles 85 are separated from each other, and the second rotor-side claw-shaped magnetic poles 87 are separated from each other. As a result, the short circuit of the magnetic flux between the first rotor side claw-shaped magnetic poles 85 of each phase is suppressed, and the short circuit of the magnetic flux between the second rotor side claw-shaped magnetic poles 87 of each phase is suppressed.

  From the above, the claw-shaped magnetic poles of each phase are opened to each other, and the short circuit of the magnetic flux is suppressed. Therefore, a magnetic circuit necessary for generating torque is formed, and the brushless motor M can be increased in torque.

  Here, an experiment was conducted to verify the magnitude of the torque generated for the brushless motor M of the present embodiment and the brushless motor M of the sixth embodiment. In the experiment, the axial length D1 of the first and second rotor-side claw-shaped magnetic poles 85 and 87 of each phase was shortened, and the first and second stator-side claw-shaped magnetic poles 95 and 97 of each phase. All were performed under the same conditions except that the length D2 in the axial direction was shortened.

  FIG. 30 is a graph showing a comparison of torques obtained by experiments. The horizontal axis indicates the types of the first and second stator side claw-shaped magnetic poles and the first and second rotor side claw-shaped magnetic poles, and “A” is the brushless motor M of the sixth embodiment, and “B "Shows the brushless motor M of this embodiment. The vertical axis represents torque, which is shown as a percentage based on the torque (100%) of the brushless motor M of the sixth embodiment.

  As is apparent from FIG. 30, “B” (the brushless motor M of the present embodiment) is 300% (three times) larger than “A” (the brushless motor M of the sixth embodiment). .

  Incidentally, the axial lengths D1 of the first and second rotor side claw-shaped magnetic poles 85 and 87 of each phase are shortened to the same, and the axial directions of the first and second stator side claw-shaped magnetic poles 95 and 97 of each phase are reduced. In the case of the brushless motor having the same length D2 as that of the sixth embodiment, the generated torque was experimentally determined. The experimental result is indicated by “C” on the horizontal axis.

As is clear from FIG. 30, “C” was larger than that of “A” and was nearly 120%.
Further, the axial length D2 of the first and second stator side claw-shaped magnetic poles 95, 97 of each phase is shortened to be the same as that of the present embodiment, and the first and second rotor side claw-shaped magnetic poles 85, Also in the case of the brushless motor in which the axial length D1 of 87 is the same as that in the sixth embodiment, the generated torque was experimentally obtained. The experimental result is indicated by “D” on the horizontal axis.

As is clear from FIG. 30, “D” was larger than that of “A”, and was nearly 290%.
It can be seen from this that the axial length D2 of the first and second stator side claw-shaped magnetic poles 95 and 97 of each phase or the axial direction of the first and second rotor side claw-shaped magnetic poles 85 and 87 of each phase. By shortening at least one of the lengths D1, a higher torque than the brushless motor M of the sixth embodiment can be realized.

  Further, in the present embodiment as well, in the same manner as in each of the embodiments described above, when there is a request for changing the number of magnetic poles, the U-phase, V-phase, and W-phase rotors 80u, 80v, and 80w of the rotor 80 have a Landel structure. Therefore, the number of poles can be easily changed by changing the number of the first and second rotor side claw-shaped magnetic poles 85 and 87 while making the annular magnet 83 the same structure. Similarly, since the U-phase, V-phase, and W-phase stators 90u, 90v, and 90w of the stator 90 have a claw pole type structure, the first and second stator side claws are formed with the coil part 93 having the same structure. Changing the number of magnetic poles 95 and 97 makes it easy to change the number of poles.

As described above in detail, the present embodiment has the following effects in addition to the effects of the sixth embodiment.
According to the present embodiment, the axial length D1 of the first and second stator side claw-shaped magnetic poles 95 and 97 of each phase and the first and second rotor side claw-shaped magnetic poles 85 and 87 of each phase is set. Each was shortened. Since the claw-shaped magnetic poles of each phase are opened to each other to suppress a short circuit of the magnetic flux and a magnetic circuit necessary for generating torque is formed, the brushless motor M can be increased in torque.

The above embodiment may be modified as follows.
In each of the above embodiments, although not particularly mentioned, the stator and the rotor may be configured by, for example, lamination of magnetic metal plate materials or molding of magnetic powder.

  In the sixth embodiment and the seventh embodiment, between the first and second rotor side claw-shaped magnetic poles 85 and 87 of each phase opposite to the first and second stator side claw-shaped magnetic poles 95 and 97 of each phase. In this case, the shift in the circumferential direction is inclined in the same direction on the opposite surface.

  This may be performed without shifting both the first and second stator side claw-shaped magnetic poles 95 and 97 of each phase and the first and second rotor side claw-shaped magnetic poles 85 and 87 of each phase. Further, the first and second stator side claw-shaped magnetic poles 95 and 97 of each phase may be shifted, and the first and second rotor side claw-shaped magnetic poles 85 and 87 of each phase may be shifted without shifting. Furthermore, the first and second rotor side claw-shaped magnetic poles 85 and 87 of each phase may be shifted without shifting the first and second stator side claw-shaped magnetic poles 95 and 97 of each phase.

  In the seventh embodiment, the first and second stator side claw-shaped magnetic poles 95 and 97 of each phase are divided by the thickness of the first and second stator core bases 94 and 96 to the first and second rotor sides of each phase. The claw-shaped magnetic poles 85 and 87 are shortened by the thicknesses of the first and second rotor core bases 84 and 86, respectively, but are not limited thereto. In short, it is sufficient that the short-circuiting of the magnetic flux is suppressed between the claw-shaped magnetic poles of each phase.

  In the seventh embodiment, the first and second stator side claw-shaped magnetic poles 95 and 97 of each phase and the first and second rotor side claw-shaped magnetic poles 85 and 87 of each phase are both shortened in the axial direction. However, only one of them may be shortened.

  Of course, except for the sixth embodiment, the first and second stator side claw-shaped magnetic poles 95 and 97 or the first and second rotor side claw-shaped magnetic poles 85 and 87 of each phase are shortened. You may apply to this embodiment.

  10, 50, 60, 70 ... motor, 11, 51, 61, 71, 71a ... stator, 12, 12a, 12b, 72, 72a ... rotor, 13, 74a, 74b ... first rotor core, 14, 76a, 76b ... 2nd rotor core, 22, 73 ... 1st claw-shaped magnetic pole on the rotor side, 24, 75 ... 2nd claw-shaped magnetic pole on the rotor side, 38 ... 1st claw-shaped magnetic pole on the stator side, 41 ... 2nd claw-shaped on the stator side Magnetic poles 31, 52a to 52c, 63 ... first stator core, 32, 53a to 53c, 64 ... second stator core, 33, 54, 62 ... coil portion, 34, 35 ... coil, M ... brushless motor (motor), Ma ... Single motor, Mu ... U phase motor part, Mv ... V phase motor part, Mw ... W phase motor part, 80 ... Rotor, 80u ... U phase rotor, 80v ... V phase rotor, 80w ... W phase rotor, 81, 82 ... First and second rotor cores 81a, 82a ... through holes, 83 ... annular magnets, 83a ... through holes, 83b, 83c ... side surfaces, 84 ... first rotor core base, 84a ... opposite surface, 84b ... anti-opposite surface, 85 ... first 1 rotor side claw-shaped magnetic pole (first claw-shaped magnetic pole), 85a, 85b ... end face, 85c ... tip face, 86 ... second rotor core base, 86a ... facing face, 86b ... anti-facing face, 87 ... second rotor side claw -Shaped magnetic pole (second claw-shaped magnetic pole), 87a, 87b ... end face, 87c ... tip face, 90 ... stator, 90u ... U-phase stator, 90v ... V-phase stator, 90w ... W-phase stator, 91, 92 ... first and Second stator core 93 ... Coil portion 94 ... First stator core base 94a ... Opposing surface 94b ... Anti-opposing surface 95 ... First stator side claw-shaped magnetic pole (first claw-shaped magnetic pole) 95a, 95b ... End surface 95c ... End surface, 96 ... second stator core base, 96a ... opposite surface, 96b ... anti-opposing surface, 97 ... second stator side claw-shaped magnetic pole (second claw-shaped magnetic pole), 97a, 97b ... end surface, 97c ... tip surface, 98 ... Annular winding, 99 ... coil bobbin, D1, D2 ... length.

Claims (3)

A first rotor core having a plurality of first claw-shaped magnetic poles at equal intervals in the circumferential direction, a second rotor core having a plurality of second claw-shaped magnetic poles at equal intervals in the circumferential direction, and a field magnet disposed between the rotor cores A motor using a rotor in which the first and second claw-shaped magnetic poles are alternately arranged in the circumferential direction and the first and second claw-shaped magnetic poles are configured as different magnetic poles in the field magnet,
The stator includes a first stator core having a plurality of first claw-shaped magnetic poles at equal intervals in the circumferential direction, a second stator core having a plurality of second claw-shaped magnetic poles at equal intervals in the circumferential direction, and a coil disposed between the stator cores. The first and second claw-shaped magnetic poles on the stator side are alternately arranged in the circumferential direction and are opposed to the first and second claw-shaped magnetic poles on the rotor side, and are based on energization to the coil unit. The polarity of the first and second claw-shaped magnetic poles on the stator side can be switched by different magnetic poles ,
The coil portion and the stator core set, and both the field magnet and the rotor core set are arranged in multiple stages in the axial direction.
In each of the stator core and the rotor core, the motor is arranged in such a manner that it is shifted in the circumferential direction between the cores of the respective stages . The motor according to claim 1 ,
The coil portion includes two coils disposed between the first stator core and the second stator core, and each of the stator cores is energized based on energization of two-phase driving power having a predetermined phase difference to the coils. A motor characterized in that the polarity of the claw-shaped magnetic pole can be switched. The motor according to claim 1 or 2 ,
In the stator, three sets of the coil portion and the stator core are arranged along the axial direction, and the claw of each stator core is based on energization of three-phase driving power with a predetermined phase difference to each set of the coil portions. A motor characterized in that the polarity of the magnetic pole can be switched.