JP5840919B2 - Rotor and motor - Google Patents

Description

  The present invention relates to a rotor and 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).

Japanese Utility Model Publication No. 5-43749

By the way, in the motor which employ | adopted the above rotors, while the improvement of an output is desired, there exists a request of suppressing the number of required components small.
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a rotor that can contribute to higher motor output while suppressing an increase in the number of components, and a motor including the rotor. There is.

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a plurality of first claw-shaped magnetic poles are projected radially outward at equal intervals on the outer periphery of the substantially disk-shaped first core base. A plurality of second claw-shaped magnetic poles protrude outward in the radial direction and extend in the axial direction at equal intervals on the outer periphery of the first rotor core extending in the direction and the substantially disk-shaped second core base. A second rotor core disposed between the first claw-shaped magnetic poles of the first rotor core to which each of the second claw-shaped magnetic poles corresponds, and between the first core base and the second core base in the axial direction. And a field magnet that is magnetized in the axial direction so that the first claw-shaped magnetic pole functions as a first magnetic pole and the second claw-shaped magnetic pole functions as a second magnetic pole. A rotor that is arranged between the first claw-shaped magnetic pole and the second claw-shaped magnetic pole in a circumferential direction; Is, inter-pole magnets the same polarity and each claw-like magnetic poles are magnetized to opposite, are constituted by regularly arranged in the first and fewer than the number of magnetic poles of the combined second claw-shaped magnetic poles The number of the interpole magnets is half of the total number of magnetic poles including the first and second claw-shaped magnetic poles, the number of pole pairs is an even number, and the first and second claw-shaped magnetic poles When attention is paid to either one of the magnetic poles, the gist is that the magnetic poles in which the interpolar magnets are arranged on both sides and the number of magnetic poles in which the interpolar magnets are not arranged on both sides are the same .

  In this invention, the number of interpole magnets magnetized so that the same polarity as each claw-shaped magnetic pole is opposed between the first claw-shaped magnetic pole and the circumferential direction of the second claw-shaped magnetic pole is less than the number of magnetic poles. Arranged and configured. The magnetic flux generated between the claw-shaped magnetic poles is reduced by arranging the interpolar magnets, and the magnetic balance of the rotor is improved and the cogging torque is reduced by arranging the interpolar magnets regularly. Can be expected. That is, it is possible to effectively improve the motor output with a small number of interpolar magnets while suppressing an increase in the number of parts by arranging the interpolar magnets at appropriate positions. Further, by appropriately arranging a small number of interpole magnets, an increase in the number of parts accompanying the increase in the number of rotors can be suppressed. Thereby, the assembly | attachment property of a rotor can be improved and reduction of manufacturing cost can be aimed at.

In this invention, since the number of inter-pole magnet is composed of half the number of poles of the combined first and second claw-shaped magnetic poles, the interpolar magnet between the circumferential direction of the first and second claw-shaped magnetic poles It can be easily arranged regularly.

  In the present invention, for a rotor configured with an even number of pole pairs, the number of magnetic poles in which the interpolar magnets are arranged on both sides in the circumferential direction and the number of magnetic poles in which the interpolar magnets are not arranged on both sides are the same. Therefore, the motor output can be effectively improved with a small number of interpole magnets while suppressing an increase in the number of parts.

According to a second aspect of the present invention, in the rotor according to the first aspect , the magnetic poles in which the interpole magnets are arranged on both sides and the magnetic poles in which the interpole magnets are not arranged on both sides are alternately arranged. This is the gist.

In the present invention, it is possible to effectively improve the motor output with a small number of interpole magnets while suppressing an increase in the number of parts.
A third aspect of the present invention is the rotor according to the first or second aspect , wherein the rotor is disposed on a radially inner surface of the first and second claw-shaped magnetic poles, and has the same polarity as the first and second magnetic poles. The gist of the present invention is to provide an auxiliary magnet magnetized so as to be radially outside.

In this invention, the auxiliary magnet magnetized so that the same polarity as the first and second magnetic poles is radially outward is disposed on the radially inner surfaces of the first and second claw-shaped magnetic poles, Leakage magnetic flux generated between each of the first and second claw-shaped magnetic poles and the field magnet is reduced, which can contribute to higher output of the motor.

A fourth aspect of the present invention is a motor including the rotor according to any one of the first to third aspects.
According to the present invention, it is possible to provide a motor that effectively improves output with a small number of interpole magnets while suppressing an increase in the number of parts.

  ADVANTAGE OF THE INVENTION According to this invention, the rotor which can contribute to the high output of a motor, suppressing the increase in a number of parts, and a motor provided with the rotor can be provided.

Sectional drawing of the motor in embodiment. (A) and (b) are perspective views of a rotor in an embodiment. Sectional drawing of the rotor in embodiment. The top view of a rotor. (A) (b) is a top view of the rotor of another example.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 1, a motor case 2 of a motor 1 closes a cylindrical housing 3 formed in a bottomed cylindrical shape and an opening on the front side (left side in FIG. 1) of the cylindrical housing 3. And a front end plate 4. A circuit housing box 5 that houses a power supply circuit such as a circuit board is attached to an end of the cylindrical housing 3 on the rear side (right side in FIG. 1). A stator 6 is fixed to the inner peripheral surface of the cylindrical housing 3. The stator 6 includes an armature core 7 having a plurality of teeth extending radially inward, and a segment conductor (SC) winding 8 wound around the teeth of the armature core 7. The rotor 11 of the motor 1 has a rotating shaft 12 and is disposed inside the stator 6. The rotating shaft 12 is a non-magnetic metal shaft, and is rotatably supported by bearings 13 and 14 supported by the bottom 3 a of the cylindrical housing 3 and the front end plate 4.

  2 and 3, the rotor 11 includes first and second rotor cores 21 and 22, an annular magnet 23 (see FIG. 3) as a field magnet, first and second back auxiliary magnets 24, 25 and an interpole magnet 26. 2 and 3 indicate the magnetization directions of the magnets 23, 24, 25, and 26 (from the S pole to the N pole).

  As shown in FIG. 2A, the first rotor core 21 has a plurality of (five in the present embodiment) first claw-shaped magnetic poles 21b at equal intervals on the outer periphery of the substantially disk-shaped first core base 21a. It protrudes radially outward and extends in the axial direction. The circumferential end surfaces 21c and 21d of the first claw-shaped magnetic pole 21b are flat surfaces extending in the radial direction (not inclined with respect to the radial direction when viewed from the axial direction), and the first claw-shaped magnetic pole 21b has a cross section perpendicular to the axis. Has a fan shape. The circumferential angle of each first claw-shaped magnetic pole 21b, that is, the angle between the circumferential end faces 21c and 21d is set smaller than the angle of the gap between the first claw-shaped magnetic poles 21b adjacent in the circumferential direction.

  As shown in FIG. 2B, the second rotor core 22 has the same shape as the first rotor core 21, and has a plurality of second claw-like shapes at equal intervals on the outer periphery of the substantially disk-shaped second core base 22a. The magnetic pole 22b protrudes radially outward and extends in the axial direction. The circumferential end surfaces 22c and 22d of the second claw-shaped magnetic pole 22b are flat surfaces extending in the radial direction, and the second claw-shaped magnetic pole 22b has a fan-shaped cross section in the direction perpendicular to the axis. The circumferential angle of each second claw-shaped magnetic pole 22b, that is, the angle between the circumferential end faces 22c and 22d is set smaller than the angle of the gap between the second claw-shaped magnetic poles 22b adjacent in the circumferential direction. The second rotor core 22 is arranged between the first core base 21a and the second core base 22a such that the second claw-shaped magnetic poles 22b are disposed between the corresponding first claw-shaped magnetic poles 21b. The annular magnet 23 (see FIG. 3) is arranged (clamped) between the directions, and is assembled to the first rotor core 21.

  As shown in FIG. 3, the outer diameter of the annular magnet 23 is set to be the same as the outer diameter of the first and second core bases 21a and 22a, and the first claw-shaped magnetic pole 21b is used as the first magnetic pole (this embodiment). The second claw-shaped magnetic pole 22b is magnetized in the axial direction so as to function as a second magnetic pole (S pole in the present embodiment). Therefore, the rotor 11 of the present embodiment is a so-called Landel type rotor using the annular magnet 23 as a field magnet. In the rotor 11, first claw-shaped magnetic poles 21b that are N poles and second claw-shaped magnetic poles 22b that are S poles are alternately arranged in the circumferential direction, and the number of magnetic poles is 10 poles (the number of pole pairs is 5). It becomes.

  A first back auxiliary magnet 24 is arranged between the back surface 21e (radially inner surface) of each first claw-shaped magnetic pole 21b and the outer peripheral surface 22f of the second core base 22a. The first back auxiliary magnet 24 has a fan-shaped cross section in the axis-perpendicular direction, and the second core base has an N pole that is in contact with the back surface 21e of the first claw-shaped magnetic pole 21b and has the same polarity as the first claw-shaped magnetic pole 21b. The side abutting on the outer peripheral surface 22f of 22a is magnetized in the radial direction so as to be the S pole having the same polarity as the second core base 22a.

  A second back auxiliary magnet 25 is arranged between the back surface 22e of each second claw-shaped magnetic pole 22b and the outer peripheral surface 21f of the first core base 21a. The second back auxiliary magnet 25 has a fan-shaped cross section in the direction perpendicular to the axis, the side contacting the back surface 22e is the S pole of the same polarity as the second claw-shaped magnetic pole 22b, and the side contacting the outer peripheral surface 21f is the first core base. It is magnetized in the radial direction so as to be an N pole having the same polarity as 21a.

  The first back auxiliary magnet 24 and the second back auxiliary magnet 25 are arranged so as to overlap each other in the axial direction at the axial position of the rotor 11 where the annular magnet 23 is arranged. The axial length is set so as to be arranged until reaching the arranged axial position. In the rotor 11 having such a configuration, in the portion including the first core base 21a in the axial direction, the second claw-shaped magnetic pole 22b on which the second back auxiliary magnet 25 is disposed and the first claw-shaped magnetic pole 21b are circumferential. The structure is arranged alternately. Further, in the portion including the annular magnet 23 in the axial direction, the first and second back auxiliary magnets 24 and 25 have the same structure as that of a normal rotor (permanent magnets having different magnetic poles alternately arranged in the circumferential direction). Become. Further, in a portion including the second core base 22a in the axial direction, a structure in which the first claw-shaped magnetic poles 21b on which the first back auxiliary magnets 24 are arranged and the second claw-shaped magnetic poles 22b are alternately arranged in the circumferential direction. It becomes.

  As shown in FIGS. 2 and 4, an inter-pole magnet 26 is disposed between the circumferential directions of the first claw-shaped magnetic pole 21b and the second claw-shaped magnetic pole 22b. More specifically, the interpole magnet 26 is disposed only on one side of the first and second claw-shaped magnetic poles 21b and 22b, and the circumferential end face 21d on one side (counterclockwise direction side) of the first claw-shaped magnetic pole 21b. And a circumferential surface of the second back auxiliary magnet 25, a flat surface formed by the circumferential end surface of the first back auxiliary magnet 24, a circumferential end surface 22c of the other claw-shaped magnetic pole 22b (clockwise direction side), and the second back auxiliary magnet 25. It is fitted and fixed between the flat surface formed by the direction end surface. The interpolar magnet 26 has a circumferential direction so that the same polarity as each of the claw-shaped magnetic poles 21b and 22b is opposed (so that the first claw-shaped magnetic pole 21b side is the N pole and the second claw-shaped magnetic pole 22b side is the S pole). Is magnetized. A gap K is formed between the radially inner end surface 26a of the interpolar magnet 26 and the outer peripheral surfaces 21f and 22f of the first and second core bases 21a and 22a. A gap is formed between the other circumferential end surface 21c of the first claw-shaped magnetic pole 21b (clockwise direction side) and the circumferential end surface 22d of the second claw-shaped magnetic pole 22b (counterclockwise direction side). Yes.

  When the drive current is supplied to the segment conductor (SC) winding 8 via the power supply circuit in the circuit housing box 5, the motor 1 configured as described above has a magnetic field for rotating the rotor 11 by the stator 6. Is generated, and the rotor 11 is rotationally driven.

Next, the operation of the motor 1 configured as described above will be described.
In the rotor 11, between the claw-shaped magnetic poles 21b and 22b, the interpolar magnet 26 magnetized so as to oppose the same polarity is disposed between the circumferential directions of the first and second claw-shaped magnetic poles 21b and 22b. Leakage magnetic flux is reduced. The interpolar magnets 26 are arranged only on one side (the circumferential end surfaces 21d and 22c side) of the first and second claw-shaped magnetic poles 21b and 22b, and the number thereof is five, which is half the number of magnetic poles.

  Here, in the above-described motor 1 (rotor 11), for example, compared to the case where the interpolar magnets 26 are arranged in all the circumferential directions of the first and second claw-shaped magnetic poles 21b and 22b (10 in total), When none is arranged (0), the output of the motor 1 is reduced by about 40%. On the other hand, when the interpolar magnets 26 are arranged on one side of the first and second claw-shaped magnetic poles 21b and 22b as in the rotor 11 of the present embodiment, the motor is compared with the case where they are arranged all around the circumferential direction. The decrease in output is suppressed to less than 20%. In other words, compared to the case where the interpolar magnet 26 is simply omitted, the interpolar magnets 26 having a reduced total number are regularly arranged, thereby improving the magnetic balance of the rotor 11 and reducing the cogging torque. It is possible to suppress a decrease (decrease rate) in output due to the reduction of the interpolar magnet 26. Therefore, the output of the motor 1 can be effectively improved with the interpolar magnets 26 having a smaller number of magnetic poles while suppressing an increase in the number of parts. In addition, such a rotor 11 is particularly effective when applied to a small output type motor in which the influence of fluctuations in output due to the reduction of the interpolar magnets 26 is relatively small.

  Further, when the interpolar magnets 26 are arranged in all the circumferential directions, the interpolar magnets 26 are required by the number of magnetic poles of the rotor 11, so that not only the number of parts increases with the increase in the number of poles, but also the assembly work. Becomes complicated. On the other hand, like the rotor 11 of the present embodiment, by reducing the number of inter-pole magnets 26, an increase in the number of parts due to multipolarization can be suppressed. That is, the assembling property can be improved and the manufacturing cost can be reduced.

Next, characteristic effects of the present embodiment will be described.
(1) In the rotor 11 of this embodiment, the magnets are magnetized so that the same polarity as that of the claw-shaped magnetic poles 21b and 22b is opposed between the first claw-shaped magnetic pole 21b and the second claw-shaped magnetic pole 22b. The inter-pole magnets 26 are regularly arranged (one side of the claw-shaped magnetic poles 21b and 22b) in a number (five) less than the number of magnetic poles. By arranging the interpolar magnet 26, the leakage magnetic flux generated between the claw-shaped magnetic poles 21b and 22b is reduced, and the magnetic balance of the rotor 11 is improved by arranging the interpolar magnet 26 regularly. Cogging torque is reduced. That is, the output of the motor 1 can be effectively improved with a small number of inter-pole magnets 26 while suppressing the increase in the number of parts by arranging the inter-pole magnets 26 at appropriate positions.

  Further, by appropriately arranging a small number of interpole magnets 26, an increase in the number of parts accompanying the increase in the number of poles of the rotor 11 can be suppressed. Thereby, the assembly | attachment property of the rotor 11 can be improved and reduction of manufacturing cost can be aimed at.

(2) The number of interpole magnets 26 is half the number of magnetic poles, and the interpole magnets 26 can be easily and regularly disposed between the first and second claw-shaped magnetic poles 21b and 22b.
(3) First and second back surfaces magnetized on the back surfaces 21e and 22e of the first and second claw-shaped magnetic poles 21b and 22b so that the same polarity as the magnetic poles of the claw-shaped magnetic poles 21b and 22b is radially outward. Auxiliary magnets 24 and 25 are arranged. Thereby, the leakage magnetic flux which generate | occur | produces between each of each claw-shaped magnetic pole 21b, 22b and the annular magnet 23 (field magnet) can be reduced, and it can contribute to the further higher output of the motor 1. FIG.

In addition, you may change embodiment of this invention as follows.
-In the said embodiment, the number of the interpole magnets 26 and the position to arrange | position are an example, and may be changed suitably. For example, the interpolar magnet 26 may be arranged with at least one omitted between the circumferential directions of the first claw-shaped magnetic pole 21b and the second claw-shaped magnetic pole 22b. In this case, the interpolar magnets 26 are preferably arranged regularly.

  In the above embodiment, the rotor 11 having 10 magnetic poles (5 pole pairs), that is, an odd number of pole pairs, is used. For example, the number of magnetic poles shown in FIG. Rotors 31 and 32 having an even number of pole pairs may be used, such as a rotor 31 having four poles and a rotor 32 having 12 poles (six pole pairs) shown in FIG. In the rotors 31 and 32, the same number (the magnetic poles) of the second claw-shaped magnetic poles 22b in which the interpolar magnets 26 are arranged on both sides in the circumferential direction and the second claw-shaped magnetic poles 22b in which the interpolar magnets 26 are not arranged on both sides in the circumferential direction. These regular arrangements are easy, and in this case, they are alternately arranged in the circumferential direction. Thereby, the output of the motor 1 can be effectively improved with a small number of interpole magnets 26 while suppressing an increase in the number of parts. The arrangement of the interpole magnets 26 may be a combination of magnetic poles arranged on one side or both sides in the circumferential direction and magnetic poles not arranged. Such a combination may be applied to the rotor 11 having an odd number of pole pairs.

In the above embodiment, the shape of the interpole magnet 26 is an example, and the shape may be changed as appropriate. For example, it may be formed in a shape that fits completely into the gap K.
-In the said embodiment, you may change into the structure which abbreviate | omitted the 1st and 2nd back surface auxiliary magnets 24 and 25. FIG.

  -Although not mentioned in particular in the said embodiment, you may comprise the rotor 11 and the stator 6 by lamination | stacking of a magnetic metal plate material, or shaping | molding of magnetic powder, for example.

  DESCRIPTION OF SYMBOLS 1 ... Motor, 11, 31, 32 ... Rotor, 21 ... 1st rotor core, 21a ... 1st core base, 21b ... 1st claw-shaped magnetic pole, 21e, 22e ... Back surface, 22 ... 2nd rotor core, 22a ... 2nd core Base, 22b ... second claw-shaped magnetic pole, 23 ... annular magnet (field magnet), 24 ... first back auxiliary magnet (auxiliary magnet), 25 ... second back auxiliary magnet (auxiliary magnet), 26 ... interpole magnet.

Claims (4)

A first rotor core having a plurality of first claw-shaped magnetic poles protruding radially outward and extending in the axial direction at an outer peripheral portion of a substantially disc-shaped first core base;
A plurality of second claw-shaped magnetic poles project radially outward and extend in the axial direction on the outer periphery of the substantially disk-shaped second core base, and correspond to each of the second claw-shaped magnetic poles. A second rotor core disposed between the first claw-shaped magnetic poles of the first rotor core;
The first claw-shaped magnetic pole is arranged between the first core base and the second core base and is magnetized in the axial direction so that the first claw-shaped magnetic pole functions as the first magnetic pole, and the second claw-shaped A rotor including a field magnet that allows the magnetic pole to function as a second magnetic pole,
An interpole magnet, which is disposed between the first claw-shaped magnetic pole and the circumferential direction of the second claw-shaped magnetic pole and is magnetized so that the same polarity as each claw-shaped magnetic pole is opposed to each other, includes the first and second claws. The number of magnetic poles is less than the total number of magnetic poles and is regularly arranged .
The number of the magnets between the poles is half of the number of magnetic poles combining the first and second claw-shaped magnetic poles,
The number of pole pairs is an even number,
When attention is paid to either one of the first and second claw-shaped magnetic poles, the number of magnetic poles on which the interpole magnets are arranged on both sides and the number of magnetic poles on which the interpole magnets are not arranged on both sides are the same. A rotor characterized by being configured . The rotor according to claim 1 , wherein
A rotor characterized in that a magnetic pole in which the interpolar magnet is arranged on both sides and a magnetic pole in which the interpolar magnet is not arranged on both sides are alternately arranged. The rotor according to claim 1 or 2 ,
The auxiliary magnet is provided on the radially inner surfaces of the first and second claw-shaped magnetic poles and is magnetized so that the same polarity as the first and second magnetic poles is radially outward. Rotor to do. The motor provided with the rotor as described in any one of Claims 1-3 .