JP5739651B2 - Rotor and motor - Google Patents

Description

  The present invention relates to a rotor and a motor.

  As a rotor used in a motor, it is composed of a rotor core having a plurality of claw-shaped magnetic poles in the circumferential direction and a field winding wound in the rotor core, and by supplying power to the field winding, A so-called Landel-type rotor in which each claw-shaped magnetic pole functions alternately as a different magnetic pole is known (for example, Patent Documents 1, 2, and 3).

  In the rotor of Patent Document 1, an auxiliary magnet is disposed between the poles, and the field winding and the magnetic flux are combined to improve the output. Moreover, in the rotor of patent document 2, the auxiliary magnet is arrange | positioned between poles so that the rotor which continues to rotate with an inertial force can be braked by the magnetomotive force of the auxiliary magnet. Furthermore, in the rotor of Patent Document 3, a magnet having a shape that does not cause leakage magnetic flux is arranged on the inner periphery of the tip of the claw-shaped magnetic pole to improve the output.

JP-A-61-85045 JP 2007-267514 A JP 2009-194985 A

  By the way, in each of the rotors of these patent documents, since the field winding is wound around the rotor core, a separate power supply device such as a spring is required, resulting in high cost. Moreover, when it is intended to reduce the size of the motor, it is difficult to secure space for the field winding and the power supply device.

  Further, the rotor of Patent Document 2 has a tandem structure, and has a problem that the number of magnets is doubled. In addition, the rotor of Patent Document 3 has a problem in that magnetic saturation of the claw-shaped magnetic poles is alleviated, but it cannot be effectively used as a magnetic flux passing to the stator.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to reduce the leakage magnetic flux between the claw-shaped magnetic poles with a simple configuration and to enable high output. And providing a motor.

In the first aspect of the present invention, a first rotor core having a plurality of first claw-shaped magnetic poles extending in the axial direction at equal intervals on the outer periphery of the first core base, and an outer periphery of the second core base, A plurality of second claw-shaped magnetic poles extending in the axial direction at equal intervals, and each of the second claw-shaped magnetic poles disposed between the corresponding first claw-shaped magnetic poles of the first rotor core; Arranged between the first rotor core and the second rotor core, magnetized in the axial direction, causing the first claw-shaped magnetic pole to function as a first magnetic pole, and the second claw-shaped magnetic pole to function as a second magnetic pole An annular magnet that is disposed between the first claw-shaped magnetic pole and the second claw-shaped magnetic pole and magnetized so as to have the same polarity as the first and second claw-shaped magnetic poles. Auxiliary magnets are installed on the opposite surfaces of the first and second rotor cores .

  According to the first aspect of the present invention, the annular magnet can eliminate the field winding in the rotor, and accordingly, a power supply device for supplying power to the field winding in the motor becomes unnecessary. The entire motor can be reduced in size and manufactured at low cost. Further, the leakage magnet between the first claw-shaped magnetic pole and the second claw-shaped magnetic pole can be reduced by the interpole magnet, and the magnetic flux of the annular magnet can be effectively used for the output of the motor.

The invention described in 請 Motomeko 2, the outer peripheral portion of the first core base, a first rotor core that extend a plurality of first claw-shaped magnetic poles in the axial direction at equal intervals, on an outer peripheral portion of the second core base A plurality of second claw-shaped magnetic poles extending in the axial direction at equal intervals, and each second claw-shaped magnetic pole disposed between each corresponding first claw-shaped magnetic pole of the first rotor core; An axially magnetized magnet disposed between the first rotor core and the second rotor core, causing the first claw-shaped magnetic pole to function as an N pole and the second claw-shaped magnetic pole to function as an S pole; An interval between the first claw-shaped magnetic pole and the second claw-shaped magnetic pole, which is magnetized so that the first claw-shaped magnetic pole side is an N pole and the second claw-shaped magnetic pole side is an S pole The auxiliary magnet was installed in the opposite surface of the said 1st and 2nd rotor core .

According to the invention described in 請 Motomeko 1 and claim 2, the second claw-shaped magnetic poles from the non-opposing face of the first rotor core and the first claw-shaped magnetic poles from the non-opposing face of the second rotor core, respectively shorted The short-circuit magnetic flux that is

The invention according to claim 3 is a motor comprising the rotor according to claim 1 or 2 .
According to invention of Claim 3 , a small and high output motor can be obtained.

  According to the present invention, the size can be reduced with a simple configuration, the leakage magnetic flux between the claw-shaped magnetic poles can be reduced, and the output can be increased.

Sectional drawing of the brushless motor of 1st Embodiment. The perspective view of a rotor similarly. The perspective view of decomposition | disassembly of a rotor core similarly. Similarly the front view of a rotor. Sectional drawing of a rotor similarly. Sectional drawing for demonstrating a short circuit magnetic flux similarly. The perspective view of the outer side auxiliary magnet provided in the rotor of 2nd Embodiment. Sectional drawing of the axial direction of a rotor similarly. The perspective view seen from the 1st rotor core side of the rotor of a 3rd embodiment. The perspective view seen similarly from the 2nd rotor core side of the rotor. Sectional drawing of the axial direction of a rotor similarly. (A) Aa line sectional view of Drawing 11, (b) bb line sectional view of Drawing 11, (c) cc line sectional view of Drawing 11. The perspective view of the rotor of 4th Embodiment. Sectional drawing of the axial direction of a rotor similarly. The perspective view seen from the 1st rotor core side of the rotor of a 5th embodiment. The perspective view seen similarly from the 2nd rotor core side of the rotor. Sectional drawing of the axial direction of a rotor similarly.

(First embodiment)
A first embodiment of the present invention will be described below with reference to FIGS.
As shown in FIG. 1, the motor case 2 of the brushless motor 1 has a case housing 3 formed in a bottomed cylindrical shape, and a front cover 4 that closes an opening on the front side of the case housing 3. Yes. A stator 5 is fixed to the inner peripheral surface of the case housing 3. The stator core 6 of the stator 5 is formed by laminating a plurality of stator core pieces 6a made of steel plates.

  As shown in FIG. 1, a rotor 8 is disposed inside the stator 5, and is fixed to the rotating shaft 10 by being inserted therethrough. In this embodiment, the rotating shaft 10 is a non-magnetic metal shaft and is rotatably supported by bearings 12 and 13 provided on the bottom of the case housing 3 and the front cover 4. The rotor 8 fixed to the rotating shaft 10 is a Landel-type rotor.

As shown in FIG. 2, the rotor 8 is disposed so as to face the first rotor core 21 having a plurality of first claw-shaped magnetic poles 20 in the circumferential direction and the first rotor core 21, and the first claw in the circumferential direction. The second rotor core 31 having a plurality of second claw-shaped magnetic poles 30 disposed between the magnetic poles 20, and the annular magnet 41 (see FIGS. 3 and 5) disposed between the first rotor core 21 and the second rotor core 31. See).
(First rotor core 21)
As shown in FIG. 3, the first rotor core 21 has a first core base 22 formed by laminating a plurality of rotor core pieces PC1 (not shown in FIGS. 1, 2, and 4) made of steel plates, and a rotating shaft 10 is fixed.

  Seven first arm portions 23 are formed on the outer peripheral surface 22a of the first core base 22 so as to extend in the radial direction at equal intervals. A first claw-shaped magnetic pole 20 extends in the axial direction toward the second rotor core 31 at the tip of each first arm portion 23. Each first claw-shaped magnetic pole 20 changes the shape of only the rotor core piece PC1 made of a steel plate on the second rotor core 31 side and extends a portion corresponding to the first claw-shaped magnetic pole 20 from the first arm portion 23 to the outer periphery. It is formed by bending with a press or the like.

  The circumferential width of the first claw-shaped magnetic pole 20 is formed to be smaller than the interval between the adjacent first claw-shaped magnetic poles 20. As a result, the first claw-shaped magnetic poles 20 are arranged on the first core base 22 in a comb-teeth shape in the circumferential direction in the circumferential direction.

Each first claw-shaped magnetic pole 20 is formed in a fan shape when viewed from the axial direction, and the outer peripheral surface 20 a and the inner peripheral surface 20 b of each first claw-shaped magnetic pole 20 are concentric with the first core base 22. The inner diameter of the inner peripheral surface 20 b of the first claw-shaped magnetic pole 20 is longer than the outer diameter of the first core base 22 by the length of the first arm portion 23. In FIG. 3, each first claw-shaped magnetic pole 20 has a first clockwise side surface 20 c and a second counterclockwise side surface 20 d in the circumferential direction that are flat and orthogonal to the central axis C of the rotating shaft 10. It is like that. Therefore, as shown in FIG. 4, each first claw-shaped magnetic pole 20 has a rectangular shape that is long in the axial direction when viewed from the radial direction.
(Second rotor core 31)
As shown in FIG. 3, the second rotor core 31 has the same shape as the first rotor core 21, and is formed by laminating a plurality of rotor core pieces PC2 (not shown in FIGS. 1, 2, and 4) made of steel plates. It has a second core base 32 and is fixed to the rotary shaft 10.

  Seven second arm portions 33 are formed on the outer peripheral surface 32a of the second core base 32 so as to extend in the radial direction at equal intervals. A second claw-shaped magnetic pole 30 is formed at the distal end portion of each second arm portion 33 so as to extend in the axial direction toward the first rotor core 21. Each second claw-shaped magnetic pole 30 changes the shape of only the rotor core piece PC2 made of a steel plate on the first rotor core 21 side and extends a portion corresponding to the second claw-shaped magnetic pole 30 from the second arm portion 33 to the outer periphery. It is formed by bending with a press or the like.

  The circumferential width of the second claw-shaped magnetic pole 30 is formed to be smaller than the distance between the adjacent second claw-shaped magnetic poles 30. As a result, the second claw-shaped magnetic poles 30 are arranged on the second core base 32 in a comb-teeth shape in the circumferential direction in the circumferential direction.

  The second claw-shaped magnetic poles 30 are formed in a fan shape in plan view from the axial direction, and the outer peripheral surface 30 a and the inner peripheral surface 30 b of each second claw-shaped magnetic pole 30 are concentric with the second core base 32. The inner diameter of the inner peripheral surface 30 b of the second claw-shaped magnetic pole 30 is longer than the outer diameter of the second core base 32 by the length of the second arm portion 33. In FIG. 3, each of the second claw-shaped magnetic poles 30 has a first clockwise side surface 30 c and a counterclockwise second side surface 30 d in the circumferential direction that are planes and are orthogonal to the central axis C of the rotation shaft 10. It is like that. Therefore, as shown in FIG. 4, each second claw-shaped magnetic pole 30 has a rectangular shape that is long in the axial direction when viewed from the radial direction.

  Moreover, the clockwise first side face 30c of each second claw-shaped magnetic pole 30 faces the first first claw-shaped magnetic pole 20 facing each other in parallel with the clockwise first side face 20c. Similarly, the counterclockwise second side surface 30d of each second claw-shaped magnetic pole 30 faces the second counterclockwise second side surface 20d of each first claw-shaped magnetic pole 20 facing each other in parallel.

  The second rotor core 31 is overlapped with the first rotor core 21 with the annular magnet 41 interposed therebetween as shown in FIG. More specifically, the second rotor core 31 includes the first rotor core 21 such that the second claw-shaped magnetic poles 30 extending in the axial direction are fitted between the first claw-shaped magnetic poles 20 of the first rotor core 21. Are superimposed. At this time, the circumferential width of the first and second claw-shaped magnetic poles 20 and 30 is smaller than the circumferential distance between the adjacent first and second claw-shaped magnetic poles 20 and 30, respectively. Both side surfaces in the circumferential direction of the one claw-shaped magnetic pole 20 and the second claw-shaped magnetic pole 30 are separated from each other.

In addition, in a state where the first rotor core 21 and the second rotor core 31 are sandwiched and fixed via the annular magnet 41, the tip surface 20e of the first claw-shaped magnetic pole 20 is opposite to the opposite surface 32c of the second core base 32, The tip surface 30e of the two-claw magnetic pole 30 is formed so as to be on the same plane as the opposite surface 22c of the first core base 22 respectively.
(Annular magnet 41)
As shown in FIGS. 3 and 5, the annular magnet 41 sandwiched between the first rotor core 21 and the second rotor core 31 has both side surfaces 41 a and 41 b in the axial direction of the first and second core bases 22 and 32. It is in contact with the opposing surfaces 22b and 32b. The outer peripheral surface 41c of the annular magnet 41 is formed as a concentric circle centering on the outer peripheral surfaces 22a and 32a of the first and second core bases 22 and 32 and the central axis C, and the outer diameter of the annular magnet 41 is the first and first. The two core bases 22 and 32 are formed to have the same outer diameter.

The annular magnet 41 is magnetized in the axial direction and is magnetized so that the first core base 22 side is an N pole and the second core base 32 side is an S pole. Therefore, the first claw-shaped magnetic poles 20 of the first rotor core 21 function as N poles (first magnetic poles) by the annular magnet 41, and the second claw-shaped magnetic poles 30 of the second rotor core 31 become S poles ( Functions as a second magnetic pole).
(First and second interpole magnets 43 and 44)
Between the first side surface 20c of the first claw-shaped magnetic pole 20 and the first side surface 30c of the second claw-shaped magnetic pole 30, a rectangular pole-shaped first interpole magnet 43 that is long in the axial direction is sandwiched and fixed. Each first inter-pole magnet 43 is magnetized in the circumferential direction so that the first claw-shaped magnetic pole 20 side functioning as the N pole becomes the same N pole and also functions as the S pole. Each of the two claw-shaped magnetic poles 30 is magnetized so as to be an S pole having the same polarity.

  On the other hand, between the second side surface 20d of the first claw-shaped magnetic pole 20 and the second side surface 30d of the second claw-shaped magnetic pole 30, a rectangular column-shaped second interpole magnet 44 that is long in the axial direction is sandwiched and fixed. Yes. Each of the second interpole magnets 44 is magnetized in the circumferential direction so that the first claw-shaped magnetic pole 20 side functioning as the N pole becomes the same N pole and also functions as the S pole. Each of the two claw-shaped magnetic poles 30 is magnetized so as to be an S pole having the same polarity.

That is, the first interpole magnet 43 and the second interpole magnet 44 are magnetized in the opposite directions in the circumferential direction.
(Inner auxiliary magnet 46)
As shown in FIGS. 3 and 5, a cylindrical inner auxiliary magnet 46 is provided inside the annular magnet 41. The inner auxiliary magnet 46 has an outer peripheral surface 46 a fixed to the inner peripheral surface 41 d of the annular magnet 41 and an inner peripheral surface 46 b fixed to the rotary shaft 10. The inner auxiliary magnet 46 is longer in the axial direction than the annular magnet 41 and is fitted and fixed to annular recesses H1 and H2 formed on the axial core side of the opposing surfaces 22b and 32b of the first and second core bases 22 and 32. Yes. The inner auxiliary magnet 46 is magnetized in the axial direction, and is magnetized so that the first rotor core 21 (first core base 22) side is an N pole and the second rotor core 31 (second core base 32) is an S pole. .
(Outer auxiliary magnet 47)
Between the outer peripheral surface 41c of the annular magnet 41 and the proximal end portions of the inner peripheral surfaces 20b and 30b of the first and second claw-shaped magnetic poles 20 and 30, as shown in FIGS. A ring-shaped outer auxiliary magnet 47 having the same length as 41 in the axial direction is provided. The outer auxiliary magnet 47 has an outer peripheral surface 47 a fixed to the inner peripheral surfaces 20 b and 30 b of the first and second claw-shaped magnetic poles 20 and 30, and an inner peripheral surface 47 b fixed to the outer peripheral surface 41 c of the annular magnet 41. ing.

  The outer auxiliary magnet 47 is magnetized in the axial direction and is magnetized so that the first rotor core 21 (first core base 22) side is an N pole and the second rotor core 31 (second core base 32) side is an S pole. Yes. Further, the magnetomotive force of the outer auxiliary magnet 47 is larger than the magnetomotive forces of the first and second interpole magnets 43 and 44.

Next, the operational effects of the first embodiment configured as described above will be described below.
(1) According to the embodiment, the annular magnet 41 is disposed between the first rotor core 21 having the plurality of first claw-shaped magnetic poles 20 and the second rotor core 31 having the plurality of second claw-shaped magnetic poles 30. In this state, the second rotor core 31 is disposed between the first claw-shaped magnetic poles 20 corresponding to the second claw-shaped magnetic poles 30 with respect to the first rotor core 21. The first and second interpole magnets 43 magnetized so as to have the same polarity as the first and second claw-shaped magnetic poles 20 and 30 between the first claw-shaped magnetic pole 20 and the second claw-shaped magnetic pole 30. , 44 are provided.

  Therefore, the annular magnet 41 can eliminate the field winding in the rotor 8 and, accordingly, the power supply device for supplying power to the field winding in the motor 1 is not necessary. The whole 1 can be made compact and can be manufactured at low cost.

  In addition, the leakage magnetic flux between each first claw-shaped magnetic pole 20 of the first rotor core 21 and each second claw-shaped magnetic pole 30 of the second rotor core 31 can be reduced by the first and second interpole magnets 43 and 44. The magnetic flux of the annular magnet 41 can be effectively used for the output of the brushless motor 1.

  Further, since the first and second interpole magnets 43 and 44 are disposed between the first and second claw-shaped magnetic poles 20 and 30, the first and second claw-shaped magnetic poles 20 and 30 are disposed between the first and second poles. Since the magnets 43 and 44 are firmly supported and fixed, the number of the first and second claw-shaped magnetic poles 20 and 30 can be increased with a simple structure, and multipolarization is possible.

  (2) According to the above embodiment, the first rotor core 21 (first core base 22) side is the N pole and the second rotor core 31 (second core base 32) side is the S pole inside the annular magnet 41. A magnetized inner auxiliary magnet 46 was provided. Therefore, the short-circuit magnetic flux φ1 shown in FIG. 6 passing from the first core base 22 on the inner diameter side of the annular magnet 41 via the rotary shaft 10 and the second core base 32 is reduced by the inner auxiliary magnet 46, and the annular magnet 41 is reduced. Thus, the output of the brushless motor 1 can be improved.

  Further, the axial length of the inner auxiliary magnet 46 is made longer than that of the annular magnet 41, and the inner auxiliary magnet 46 is arranged in the first and second core bases 22 and 32. Therefore, the short-circuit magnetic flux φ1 on the inner diameter side (the axial short-circuit magnetic flux that does not generate torque) can be further reduced, and the magnetic flux of the annular magnet 41 can be effectively used for the output of the brushless motor 1.

Furthermore, since the rotating shaft 10 is formed of a non-magnetic metal shaft, the short-circuit magnetic flux φ1 on the inner diameter side can be further reduced.
(3) According to the above embodiment, the first and second arm portions are provided between the outer peripheral surface 41 c of the annular magnet 41 and the proximal inner peripheral surfaces 20 b and 30 b of the first and second claw-shaped magnetic poles 20 and 30. An outer auxiliary magnet 47 magnetized with the first rotor core 21 side as an N pole and the second rotor core 31 side as an S pole is provided so as to cover the outer surfaces 23 and 33. Accordingly, the outer auxiliary magnet 47 reduces the short-circuit magnetic flux φ2 (axial short-circuit magnetic flux that does not generate torque) shown in FIG. 6 from the first core base 22 on the outer diameter side of the annular magnet 41 through the second core base 32. In addition, the magnetic flux can be used effectively, and the output of the brushless motor 1 can be improved.

  (4) According to the embodiment, the first and second claw-shaped magnetic poles 20 and 30 have a rectangular shape that is long in the axial direction when viewed from the radial direction, and the first side surface 20 c of each first claw-shaped magnetic pole 20. And the first side surface 30c of each second claw-shaped magnetic pole 30, and the second side surface 20d of each first claw-shaped magnetic pole 20 and the second side surface 30d of each second claw-shaped magnetic pole 30 are opposed to each other in parallel. Formed.

Therefore, as the first and second interpole magnets 43 and 44, a magnet that can be formed at a low cost in the shape of a rectangular column that is long in the axial direction can be used.
(5) Moreover, according to the said embodiment, the 1st and 2nd interpole magnets 43 and 44 are formed, for example with a ferrite magnet, and the annular magnet 41 is formed with a neodymium magnet, for example, and only reduces a leakage magnetic flux. By making the magnetomotive force of the first and second interpole magnets 43 and 44 smaller than the magnetomotive force of the annular magnet 41, the cost can be reduced.

  (6) According to the above embodiment, the first and second claw-shaped magnetic poles 20 and 30 are formed by bending a part of the rotor core pieces PC1 and PC2 made of steel plates forming the first and second rotor cores 31. did.

Therefore, the manufacturing method of the first and second claw-shaped magnetic poles 20 and 30 is simple and can be manufactured in a short time, and the cost can be reduced.
(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS.

  This embodiment is different in the magnetization method of the outer auxiliary magnet 47 shown in the first embodiment. Therefore, for the sake of convenience of explanation, the different parts of the outer auxiliary magnet will be described in detail, and other parts common to the first embodiment will be denoted by the same reference numerals, and detailed description thereof will be omitted.

  As shown in FIG. 7, the outer auxiliary magnet 50 has N poles and S poles alternately magnetized in the circumferential direction. As shown in FIG. 8, the outer auxiliary magnet 50 has the same axial length as the annular magnet 41, the inner peripheral surface 50 a is the outer peripheral surface 41 c of the annular magnet 41, and the outer peripheral surface 50 b is the first. The first and second claw-shaped magnetic poles 20 and 30 are fixed to the inner peripheral surfaces 20b and 30b.

  In the outer auxiliary magnet 50, the N pole portion 51 magnetized to the N pole on the outer peripheral surface functions as the N pole of the first rotor core 21. The second claw-shaped magnetic pole 30 in which the S pole portion 52 fixed to the proximal end portion of the inner peripheral surface 20 b of the claw-shaped magnetic pole 20 and magnetized to the S pole on the outer peripheral surface functions as the S pole of the second rotor core 31. It adheres to the base end of the inner peripheral surface 30b.

Next, effects of the second embodiment configured as described above will be described below.
(1) According to the above embodiment, the annular outer auxiliary magnet 50 in which the N pole and the S pole are alternately magnetized in the circumferential direction is installed on the outer circumferential side of the annular magnet 41.

  The N pole portion 51 magnetized to the N pole of the outer auxiliary magnet 50 is brought into contact with the inner peripheral surface 20b of the first claw-shaped magnetic pole 20 having the same polarity, and the S pole magnetized to the S pole of the outer auxiliary magnet 50. The portion 52 was in contact with the inner peripheral surface 30b of the second claw-shaped magnetic pole 30 having the same polarity.

Accordingly, the outer auxiliary magnet 50 can suppress the short-circuit magnetic flux of the annular magnet 41 and can effectively use the magnetic flux of the outer auxiliary magnet 50 for the output of the brushless motor 1.
(2) Moreover, according to the said 2nd Embodiment, the effect similar to (1) (2) (4)-(6) demonstrated by the effect of 1st Embodiment can be acquired.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS.
In the present embodiment, the configurations of the first and second interpole magnets 43 and 44 and the outer auxiliary magnet 47 shown in the first embodiment are different. Therefore, for the sake of convenience of explanation, portions of the first and second interpole magnets and the outer auxiliary magnet that are different from each other will be described in detail, and the other portions common to the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

  As shown in FIGS. 9 and 10, each first interpole magnet 43 sandwiched and fixed between the first side surface 20 c of the first claw-shaped magnetic pole 20 and the first side surface 30 c of the second claw-shaped magnetic pole 30 is The first and second core bases 22 and 32 are formed so as to extend in the radial direction until they contact the outer peripheral surfaces 22a and 32a.

  In addition, each second interpole magnet 44 sandwiched and fixed between the second side surface 20d of the first claw-shaped magnetic pole 20 and the second side surface 30d of the second claw-shaped magnetic pole 30 has the first and second radial directions. The two core bases 22 and 32 are formed so as to extend to contact with the outer peripheral surfaces 22a and 32a.

  Then, by forming the first and second interpole magnets 43 and 44, the second claw-shaped magnetic pole 30, the second arm portion 33 (see FIG. 11), the annular magnet 41 (see FIG. 11), the first core base 22, a space surrounded by the first and second interpole magnets 43 and 44 and having an opening on the first rotor core 21 side is formed. In the space, as shown in FIG. 9, the first back auxiliary magnet 61 is fitted and fixed.

  The first back auxiliary magnet 61 is magnetized in the radial direction, and the first core base 22 has a side that contacts the inner peripheral surface 30b of the second claw-shaped magnetic pole 30 as an S pole having the same polarity as the second claw-shaped magnetic pole 30. Is magnetized so that the side in contact with the first core base 22 has the same polarity as that of the first core base 22.

  Similarly, the first claw-shaped magnetic pole 20, the first arm portion 23 (see FIG. 11), the annular magnet 41 (see FIG. 11), the second core base 32, and the first and second interpole magnets 43 and 44 are surrounded. Thus, a space opened on the second rotor core 31 side is formed. As shown in FIG. 10, the second back auxiliary magnets 62 are fitted and fixed in the space.

  The second back auxiliary magnet 62 is magnetized in the radial direction, and the second core base 32 has a side that contacts the inner peripheral surface 20 b of the first claw-shaped magnetic pole 20 as an N pole having the same polarity as the first claw-shaped magnetic pole 20. Is magnetized so that the side in contact with the second core base 32 has the same polarity as that of the second core base 32.

  That is, as shown in FIG. 12A, the portion A1 of the first core base 22 (see FIG. 9) includes a second claw-shaped magnetic pole 30 that functions as the first back auxiliary magnet 61 having the S pole on the stator 5 side, The first claw-shaped magnetic poles 20 functioning as N-pole salient poles by the first back auxiliary magnet 61 form a so-called consequent pole-structure rotor that is alternately arranged in the circumferential direction.

  Further, as shown in FIG. 12C, the portion A3 of the second core base 32 (see FIG. 9) includes a first claw-shaped magnetic pole 20 that functions as a second back auxiliary magnet 62 having an N-pole on the stator 5 side, The second claw-shaped magnetic poles 30 functioning as S-pole salient poles by the second back auxiliary magnet 62 form a rotor having a so-called contiguous pole structure that is alternately arranged in the circumferential direction.

  Furthermore, as shown in FIG. 12B, the portion A2 of the annular magnet 41 (see FIG. 9) includes a first claw-shaped magnetic pole 20 that functions as an N pole on the stator 5 side by the first back auxiliary magnet 61, and a second A second claw-shaped magnetic pole 30 having the stator 5 side functioning as an S pole by the back auxiliary magnet 62 has a Landell structure in which the circumferential direction is alternately arranged.

Next, the operational effects of the third embodiment configured as described above will be described below.
(1) According to the above embodiment, the second claw-shaped magnetic pole 30, the second arm portion 33, the annular magnet 41, the first core base 22, the first and second interpole magnets 43 and 44 are surrounded, A space opened on the 1 rotor core 21 side was formed, and the first back auxiliary magnet 61 was fitted and fixed in the space. The first back auxiliary magnet 61 is magnetized in the radial direction, and the side contacting the second claw-shaped magnetic pole 30 is the side contacting the first core base 22 with the S pole having the same polarity as the second claw-shaped magnetic pole 30. Was magnetized in the radial direction so as to have the same N pole as that of the first core base 22.

  Accordingly, the portion A1 of the first core base 22 has a continuous pole structure by the first back auxiliary magnet 61, and the short-circuit magnetic flux of the annular magnet 41 can be further suppressed, and the magnetic flux of the first back auxiliary magnet 61 is reduced to the brushless. It can be used more effectively for the output of the motor 1.

  (2) According to the above embodiment, the first claw-shaped magnetic pole 20, the first arm portion 23, the annular magnet 41, the second core base 32, the first and second interpole magnets 43 and 44 are surrounded, A space opened on the two rotor core 31 side was formed, and the second back auxiliary magnet 62 was fitted and fixed in the space. The second back auxiliary magnet 62 is magnetized in the radial direction, and the side contacting the first claw-shaped magnetic pole 20 is the side contacting the second core base 32 with the N pole having the same polarity as the first claw-shaped magnetic pole 20. Was magnetized in the radial direction so as to be the S pole having the same polarity as the second core base 32.

  Accordingly, the portion A3 of the second core base 32 has a continual pole structure by the second back auxiliary magnet 62, and the short-circuit magnetic flux of the annular magnet 41 can be further suppressed, and the magnetic flux of the second back auxiliary magnet 62 is reduced to the brushless. It can be used more effectively for the output of the motor 1.

  (3) According to the embodiment, the first and second back auxiliary magnets 61 and 62 have the same surface area as the first and second claw-shaped magnetic poles 20 and 30 when viewed from the radial direction. It is much larger than the first and second interpole magnets 43 and 44.

Therefore, the magnetic flux of the first and second back auxiliary magnets 61 and 62 can be used more effectively for the output of the brushless motor 1.
Further, the first and second back auxiliary magnets 61 and 62 are formed of, for example, neodymium magnets, and the first and second interpole magnets 43 and 44 are formed of, for example, ferrite magnets, so that the first and second back auxiliary magnets are formed. Increasing the magnetomotive force of the magnets 61 and 62 to be larger than that of the first and second interpole magnets 43 and 44 effectively increases the amount of magnetic flux contributing to the output while reducing the cost, thereby improving the output. be able to.

(4) Moreover, according to the said 3rd Embodiment, the effect similar to (1) (2) (4)-(6) demonstrated by the effect of 1st Embodiment can be acquired.
(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIGS.

  In this embodiment, the configuration of the rotor 8 shown in the third embodiment is different. Therefore, for convenience of explanation, the different rotor cores will be described in detail, and other parts common to the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

  As shown in FIGS. 13 and 14, the rotor 70 of the present embodiment is provided with two sets of the rotor 8 of the third embodiment, which are layered to form a first layer rotor 71 and a second layer rotor. 72 are fixed to the rotary shaft 10 so as to overlap each other. In the present embodiment, the second rotor core 31 of the first layer rotor 71 (the anti-opposing surface 32c of the second core base 32) and the second rotor core 31 of the second layer rotor 72 (the anti-opposite of the second core base 32). The first and second claw-shaped magnetic poles 20 and 30 having the same polarity overlap with each other in the axial direction.

  In this embodiment, the first and second interpole magnets 43 and 44 on the rotor 71 side and the first and second interpole magnets 43 and 44 on the rotor 72 side are integrated to form a single first and second pole. It consists of magnets 43 and 44 and is fitted in the axial direction so as to be continuous with the rotor 71 and the rotor 72.

  Accordingly, the rotor 70 composed of the rotors 71 and 72 is configured by integrating the first and second interpole magnets 43 and 44 having the same polarity of the rotors 71 and 72, thereby reducing the number of parts and reducing the cost. Can be planned.

Next, operational effects of the fourth embodiment configured as described above will be described below.
(1) According to the above-described embodiment, by combining the two rotors 71 and 72, a rotor that generates higher torque can be obtained, and further, axial imbalance can be canceled. Moreover, since the rotors 71 and 72 have the same structure, the number of parts can be reduced, and the manufacture is easy and the cost can be reduced.

  (2) According to the above embodiment, the first and second inter-pole magnets 43 and 44 of the same polarity of the overlapping rotors 71 and 72 can be integrated and used as a single permanent magnet. Cost can be reduced.

(3) Moreover, according to the said 4th Embodiment, the effect similar to (1) (2) (4)-(6) demonstrated by the effect of 1st Embodiment can be acquired.
(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIGS.

  The present embodiment is a rotor to which the rotor 8 of the third embodiment is applied. Therefore, in this embodiment, for convenience of explanation, the same reference numerals are used for the common parts with the third embodiment, and detailed explanation is omitted.

  As shown in FIG. 15, the first shaft-side auxiliary magnet 81 is fixed to the first rotor core 21 on the side opposite to the facing surface 22 c of the first core base 22. The first shaft-side auxiliary magnet 81 has the same outer shape as viewed from the axial direction as the outer shape of the first rotor core 21 and covers the first rotor core 21. The first shaft side auxiliary magnet 81 is magnetized in the axial direction, and the side fixed to the first core base 22 is an N pole having the same polarity as the first core base 22 and the opposite side is an S pole. It is magnetized to become.

  As shown in FIG. 16, the second shaft-side auxiliary magnet 82 is fixed to the second rotor core 31 on the side opposite to the facing surface 32 c of the second core base 32. The second axial auxiliary magnet 82 has the same outer shape as viewed from the axial direction as the outer shape of the second rotor core 31, and covers the second rotor core 31. The second shaft side auxiliary magnet 82 is magnetized in the axial direction, and the side fixed to the second core base 32 is an S pole having the same polarity as the second core base 32 and the opposite side is an N pole. It is magnetized to become.

Next, operational effects of the fifth embodiment configured as described above will be described below.
(1) According to the above embodiment, the first shaft-side auxiliary magnet 81 is fixed and covered on the side of the first core base 22 opposite to the opposite surface 22c. Then, the first core base 22 side of the first shaft side auxiliary magnet 81 was magnetized so as to have the same N pole as that of the first core base 22.

Therefore, as shown in FIG. 17, the short-circuit magnetic flux φ <b> 3 that is short-circuited from the opposite surface 22 c of the first core base 22 to the second claw-shaped magnetic pole 30 can be suppressed.
(2) According to the above embodiment, the second shaft-side auxiliary magnet 82 is fixed and covered on the side of the second core base 32 opposite to the opposite surface 32c. Then, the second core base 32 side of the second shaft side auxiliary magnet 82 was magnetized so as to have the same polarity as the second core base 32.

Therefore, as shown in FIG. 17, the short-circuit magnetic flux φ4 that is short-circuited from the first claw-shaped magnetic pole 20 to the opposite surface 32c of the second core base 32 can be suppressed.
(3) Moreover, according to the said 5th Embodiment, the effect similar to (1) (2) (4)-(6) demonstrated by the effect of 1st Embodiment can be acquired.

In addition, you may change the said embodiment as follows.
In the first to fifth embodiments, the inner auxiliary magnet 46 is provided, but the inner auxiliary magnet 46 may be omitted. In this case, the annular magnet 41 reaches the rotating shaft 10, and the annular recesses H1 and H2 formed in the first and second rotor cores 21 and 31 are omitted.

  In the first to fifth embodiments, the axial length of the inner auxiliary magnet 46 is longer than that of the annular magnet 41, but may be the same length. In this case, the annular recesses H1 and H2 formed in the first and second rotor cores 21 and 31 are omitted.

  In the first embodiment, the outer auxiliary magnet 47 is provided, but the outer auxiliary magnet 47 may be omitted. At this time, it goes without saying that the inner auxiliary magnet 46 may be omitted.

  In the first to fifth embodiments, the first and second claw-shaped magnetic poles 20 and 30 have a rectangular shape that is long in the axial direction when viewed from the radial direction. You may form this so that it may become a taper shape, so that the shape of the 1st and 2nd nail | claw-shaped magnetic poles 20 and 30 goes to a front-end | tip. In this case, it is necessary to change the shapes of the first and second interpole magnets 43 and 44 in accordance with the shapes of the first and second claw-shaped magnetic poles 20 and 30. Of course, other shapes may be used.

In the third embodiment, the first back auxiliary magnet 61 and the second back auxiliary magnet 62 are provided, but one of them may be omitted.
In the fourth embodiment, two sets of the rotor 8 of the third embodiment are prepared, and this is layered to form one rotor 70 as a first layer rotor 71 and a second layer rotor 71. Configured. This may be implemented by preparing three sets of the rotor 8 of the third embodiment and making a three-layer structure.

  In this case, for example, in FIG. 13, the third-layer rotor overlapping the second-layer rotor 72 is in contact with the first rotor core 21 of the third-layer rotor on the second-layer rotor 72 side, The first and second claw-shaped magnetic poles are relatively arranged so as to overlap in the axial direction. At this time, the overlapping first and second interpole magnets 43 and 44 having the same polarity are constituted by one permanent magnet. Therefore, the number of parts can be reduced and the cost can be reduced.

In the fourth embodiment, the rotor 70 is configured using the rotor 8 of the third embodiment, but may be implemented using the rotors shown in the first to third embodiments and the respective other examples.
In the fourth embodiment, the first and second inter-pole magnets 43 and 44 having the same polarity of the overlapping rotors 71 and 72 are integrated and used as one magnet. However, separate first and second poles are used, respectively. Of course, it is possible to carry out using the intermediate magnets 43 and 44.

  In the first to fifth embodiments, the first rotor core 21 and the second rotor core 31 are formed by stacking the rotor core pieces PC1 and PC2 made of steel plates. This may be formed integrally by forging or may be formed of a dust core material. For example, the first rotor core 21 and the second rotor core 31 are made by mixing magnetic powder such as iron powder and an insulator such as resin and then heat-press-molding with a mold.

  In this case, the design freedom of the first rotor core 21 and the second rotor core 31 is high, the manufacturing process becomes very simple, and the magnetic resistance of the first rotor core 21 and the second rotor core 31 can be reduced.

  In the first to fifth embodiments, the number of the first and second claw-shaped magnetic poles 20 and 30 is seven, but is not limited to this, and the first and second claw-shaped magnetic poles 20 and 30 are not limited thereto. The number of 30 may be changed as appropriate.

  In the first to fourth embodiments, the first shaft side auxiliary magnet 81 and the second shaft side auxiliary magnet 82 described in the fifth embodiment are fixed to the first and second rotor cores 21 and 31 and covered. May be.

  DESCRIPTION OF SYMBOLS 1 ... Brushless motor (motor), 2 ... Motor case, 3 ... Case housing, 4 ... Front cover, 5 ... Stator, 6 ... Stator core, 6a ... Stator core piece, 8 ... Rotor, 10 ... Rotary shaft, 12, 13 ... Bearing , 20 ... first claw-shaped magnetic pole, 20a ... outer peripheral surface, 20b ... inner peripheral surface, 20c ... first side surface, 20d ... second side surface, 20e ... tip end surface, 21 ... first rotor core, 22 ... first core base, 22a ... outer peripheral surface (outer peripheral portion), 22b ... opposing surface, 22c ... anti-opposing surface, 23 ... first arm portion, 30 ... second claw-shaped magnetic pole, 30a ... outer peripheral surface, 30b ... inner peripheral surface, 30c ... first Side surface, 30d ... second side surface, 30e ... tip surface, 31 ... second rotor core, 32 ... second core base, 32a ... outer peripheral surface (outer peripheral portion), 32b ... opposing surface, 32c ... anti-opposing surface, 33 ... first Arm part, 41 ... annular magnet, 4 a, 41b ... side surface, 41c ... outer peripheral surface, 41d ... inner peripheral surface, 43 ... first interpole magnet (interpole magnet), 44 ... second interpole magnet (interpole magnet), 46 ... inner auxiliary magnet (auxiliary) Magnet), 46a ... outer peripheral surface, 46 ... inner peripheral surface, 47 ... outer auxiliary magnet (auxiliary magnet), 47a ... outer peripheral surface, 47b ... inner peripheral surface, 50 ... outer auxiliary magnet (auxiliary magnet), 50a ... outer peripheral surface, 50b ... inner peripheral surface, 51 ... N pole part, 52 ... S pole part, 61 ... first back auxiliary magnet (auxiliary magnet), 62 ... second back auxiliary magnet (auxiliary magnet), 70, 71, 72 ... rotor, 81 ... 1st axis side auxiliary magnet, 82 ... 2nd axis side auxiliary magnet, φ1, φ2, φ3, φ4 ... Short-circuit magnetic flux, A1, A2, A3 ... portion, C ... Center axis, H1, H2 ... Annular recess, PC1 , PC2 ... rotor core piece (plate material), SP1 ... first space, SP2 ... second space.

Claims (3)

A first rotor core having a plurality of first claw-shaped magnetic poles extending in the axial direction at equal intervals on the outer periphery of the first core base;
A plurality of second claw-shaped magnetic poles are formed on the outer periphery of the second core base so as to extend in the axial direction at equal intervals, and the first claw-shaped magnetic poles of the first rotor core respectively corresponding to the second claw-shaped magnetic poles. A second rotor core disposed in between,
Arranged between the first rotor core and the second rotor core, magnetized in the axial direction, causing the first claw-shaped magnetic pole to function as a first magnetic pole, and the second claw-shaped magnetic pole to function as a second magnetic pole An annular magnet,
An interpole magnet disposed between the first claw-shaped magnetic pole and the second claw-shaped magnetic pole and magnetized so as to have the same polarity as the first and second claw-shaped magnetic poles ;
A rotor, wherein auxiliary magnets are installed on opposite surfaces of the first and second rotor cores . A first rotor core having a plurality of first claw-shaped magnetic poles extending in the axial direction at equal intervals on the outer periphery of the first core base;
A plurality of second claw-shaped magnetic poles are formed on the outer periphery of the second core base so as to extend in the axial direction at equal intervals, and the first claw-shaped magnetic poles of the first rotor core respectively corresponding to the second claw-shaped magnetic poles. A second rotor core disposed in between,
An axially magnetized magnet disposed between the first rotor core and the second rotor core, causing the first claw-shaped magnetic pole to function as an N pole and the second claw-shaped magnetic pole to function as an S pole;
An interval between the first claw-shaped magnetic pole and the second claw-shaped magnetic pole, which is magnetized so that the first claw-shaped magnetic pole side is an N pole and the second claw-shaped magnetic pole side is an S pole With a magnet ,
A rotor, wherein auxiliary magnets are installed on opposite surfaces of the first and second rotor cores . Motor comprising the rotor according to claim 1 or 2.

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