JP5855903B2 - 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, the structure which arrange | positions an interpolar magnet between the circumferential directions of claw-shaped magnetic poles, and suppresses generation | occurrence | production of the leakage magnetic flux between claw-shaped magnetic poles can be considered. However, there is a possibility that the output of the motor cannot be suitably increased simply by arranging the interpole magnet.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a rotor and a motor that can further increase the motor output.

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 member 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, The first claw-shaped magnetic pole is disposed between the first claw-shaped magnetic pole and the circumferential direction of the second claw-shaped magnetic pole, An interpole magnet magnetized so as to have the same pole as the claw-shaped magnetic pole, and a back surface of the first and second claw-shaped magnetic poles, the same polarity as the first and second magnetic poles is radially outward. A rotor having a magnetized auxiliary magnet, wherein the interpole magnet is disposed in a manner having a gap in the radial direction with respect to the first and second rotor cores, and the interpole magnet and the first rotor core The gap between the first and second claws adjacent to each other in the circumferential direction of the interpole magnet, the first core base on the radially inner side of the interpole magnet, as viewed from the axial direction. And the auxiliary magnet disposed on the back surface of the second claw-shaped magnetic pole adjacent in the circumferential direction of the interpolar magnet, and between the interpolar magnet and the second rotor core. The air gap is, when viewed from the axial direction, the interpolar magnet and the second core on the radially inner side of the interpolar magnet. And the second claw-shaped magnetic pole adjacent in the circumferential direction of the interpole magnet and the auxiliary magnet disposed on the back surface of the first claw-shaped magnetic pole adjacent in the circumferential direction of the interpole magnet. the Rukoto formed in the gist thereof.

  In the present invention, since the interpole magnet is arranged in a mode having a gap in the radial direction with respect to the first and second rotor cores, the short-circuit magnetic flux to the inner side in the radial direction of the interpole magnet is reduced, and the magnetic flux of the interpole magnet is reduced. Can be used effectively to increase the motor output.

  According to a second aspect of the present invention, in the rotor of the first aspect, the radial length L of the air gap is 0 <L / G ≦ 4, where G is an air gap between the stator and the stator facing the rotor core. The main point is that the configuration is .5.

  In the present invention, the radial length L of the air gap is configured such that 0 <L / G ≦ 4.5, where G is the air gap between the stator and the stator facing the rotor core. As shown, the torque (output) as a motor can be increased.

  According to a third aspect of the present invention, in the rotor according to the first or second aspect, the radial length L of the air gap is 1.5 ≦ when the air gap between the stators facing the rotor core is G. The gist of the configuration is L / G.

  In the present invention, the radial length L of the air gap is configured to satisfy 1.5 ≦ L / G where G is the air gap between the stator and the stator facing the rotor core. Here, for example, when the radial length of the gap is short, the magnetic flux of the interpolar magnet is short-circuited to the inner diameter side without passing between the stator and the rotor, and a reverse magnetic field acts on the adjacent auxiliary magnet. Therefore, by setting the radial length L of the gap to 1.5 ≦ L / G, it is possible to suppress a reverse magnetic field from acting on the auxiliary magnet and causing a decrease in magnetic flux density as shown in FIG. .

The gist of the invention described in claim 4 is that, in the rotor according to claim 2 or 3, the length L of the gap is configured to satisfy 1.5 ≦ L / G ≦ 3.5. And
In the present invention, the length L of the air gap is configured to satisfy 1.5 ≦ L / G ≦ 3.5, so that the torque (output) as a motor is maintained in a high range as shown in FIG. can do.

  A fifth aspect of the present invention is the rotor according to any one of the first to fourth aspects, wherein the first and second rotor cores are formed by disposing a nonmagnetic material in the gap. To do.

  In the present invention, the first and second rotor cores reduce the short-circuit magnetic flux to the inner side in the radial direction of the interpole magnet because the member arranged in the gap is a non-magnetic substance even if the non-magnetic substance is arranged in the gap. Thus, the motor output can be increased by effectively using the magnetic flux of the interpolar magnet.

The gist of the invention described in claim 6 is that the rotor according to any one of claims 1 to 5 is provided.
In the present invention, a motor capable of further increasing the motor output can be provided.

  Therefore, according to the above-described invention, it is possible to provide a rotor and a motor that can further increase the motor output.

Sectional drawing of the motor in embodiment. (A) is a top view of the motor same as the above, (b) is the principal part enlarged view of (a). The perspective view of the rotor in the same as the above. Sectional drawing of the rotor in the same as the above. The graph which shows the ratio of the radial direction length L of the space | gap of a rotor in the same as the above, the ratio of the air gap G between a rotor and a stator, and the maximum torque. The graph which shows the ratio of the radial direction length L of the space | gap of a rotor in the same as the above, the ratio of the air gap between a rotor and a stator, and magnetic flux density.

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.

  3 and 4, the rotor 11 includes first and second rotor cores 21 and 22, an annular magnet 23 (see FIG. 4) as a field member, first and second back auxiliary magnets 24, 25 and an interpole magnet 26. 3 and 4 indicate the magnetization directions (from the S pole to the N pole) of the magnets 23, 24, 25, and 26.

  As shown in FIGS. 3 and 4, the first rotor core 21 has a plurality of (five in the present embodiment) first claw-shaped magnetic poles 21 b at equal intervals on the outer periphery of the substantially disk-shaped first core base 21 a. 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 FIGS. 3 and 4, the second rotor core 22 has the same shape as the first rotor core 21, and has a plurality of second claw-like shapes on the outer periphery of the substantially disk-shaped second core base 22 a at equal intervals. 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. 4) is arranged (clamped) between the directions, and is assembled to the first rotor core 21. At this time, since one circumferential end face 21c of the first claw-shaped magnetic pole 21b and the other circumferential end face 22d of the second claw-shaped magnetic pole 22b are formed in parallel along the axial direction, each end face 21c is formed. , 22d is formed so as to be substantially linear along the axial direction. Further, since the other circumferential end face 21d of the first claw-shaped magnetic pole 21b and one circumferential end face 22c of the second claw-shaped magnetic pole 22b are formed so as to be parallel along the axial direction, each end face 21d, The gap between 22c is formed so as to be substantially linear along the axial direction.

  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. Here, since the number of pole pairs is an odd number of 3 or more, the claw-like magnetic poles having the same polarity do not face each other at 180 ° in the circumferential direction when viewed in the rotor core unit, so that the shape is stable against magnetic vibration.

  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. Magnetization is performed so that the side of 22a that comes into contact with the outer peripheral surface 22f becomes the S pole having the same polarity as the second core base 22a.

  Similarly to the first claw-shaped magnetic pole 21b, a second back auxiliary magnet 25 is disposed on the back surface 22e of each second claw-shaped magnetic pole 22b. As the 1st back auxiliary magnet 24 and the 2nd back auxiliary magnet 25, a ferrite magnet can be used, for example. The second back auxiliary magnet 25 has a fan-shaped cross section in the direction perpendicular to the axis, and is magnetized so that the side in contact with the back surface 22e is an S pole and the side in contact with the outer peripheral surface 21f of the first core base 21a is an N pole. ing.

  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.

  As shown in FIG. 3, interpolar magnets 26 and 27 are disposed between the circumferential directions of the first claw-shaped magnetic pole 21b and the second claw-shaped magnetic pole 22b. Specifically, the first interpole magnet 26 includes a flat surface formed by one circumferential end surface 21c of the first claw-shaped magnetic pole 21b and a circumferential end surface of the first back auxiliary magnet 24, and a second claw-shaped magnet. It is fitted and fixed between the other circumferential end face 22d of the magnetic pole 22b and a flat face formed by the circumferential end face of the second back auxiliary magnet 25. A gap K having a radial length L is formed between the radially inner end face 26a of the first interpole magnet 26 and the outer peripheral faces 21f and 22f of the first and second core bases 21a and 22a. Yes.

  As shown in FIGS. 2A and 2B, the gap K has a radial length L when the air gap in the radial direction between the inner peripheral surface of the stator 6 and the outer peripheral surface of the rotor 11 is G. , 0 <L / G ≦ 4.5, and preferably 1.5 ≦ L / G. More preferably, it is desirable to form so that 1.5 ≦ L / G ≦ 3.5.

  The second interpole magnet 27 has the same shape as the first interpole magnet 26, and is formed by the other circumferential end face 21 f of the first claw-shaped magnetic pole 21 b and the circumferential end face of the first back auxiliary magnet 24. And is fixed between a flat surface formed by one of the circumferential end surfaces 22e of the second claw-shaped magnetic pole 22b and the circumferential end surface of the second back auxiliary magnet 25, and the radially inner end surface A gap K is formed between 27a and the outer peripheral surfaces 21f and 22f of the first and second core bases 21a and 22a. The first and second interpole magnets 26 and 27 are opposite in polarity to the first and second claw-shaped magnetic poles 21b and 22b (the first claw-shaped magnetic pole 21b side is N-pole and the second claw-shaped It is magnetized in the circumferential direction (so that the magnetic pole 22b side becomes the S pole).

  When the three-phase 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 rotates the rotor 11 with 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.
The rotor 11 of the motor 1 of the present embodiment includes end surfaces 26a, 27a on the radially inner sides of the first and second interpole magnets 26, 27 and outer peripheral surfaces 21f, 22f of the first and second core bases 21a, 22a. A gap K having a length L in the radial direction is formed therebetween. For this reason, the short-circuit magnetic flux radially inward from the interpole magnets 26 and 27 is reduced, and the magnetic flux of the interpole magnets 26 and 27 is effectively acted as a motor output.

  The gap K has a radial length L of 0 <L / G ≦ 4.5, where G is an air gap in the radial direction between the inner peripheral surface of the stator 6 and the outer peripheral surface of the rotor 11. Therefore, the motor output is increased by obtaining the torque in the range of X in FIG. Further, by forming the gap K so that 1.5 ≦ L / G ≦ 3.5, a higher torque in the range of Y in FIG. 5 is obtained, and the motor output is increased.

  Here, for example, when the radial length L of the gap K is short, the magnetic fluxes of the interpole magnets 26 and 27 are short-circuited to the inner diameter side without passing between the stator 6 and the rotor 11, and are adjacent to the back auxiliary magnets 24 and 24. A reverse magnetic field acts on 25. Therefore, for example, by setting the gap K to 1.5 ≦ L / G, a magnetic flux density in the range of Z shown in FIG. 6 can be obtained, and a reverse magnetic field acts on the back auxiliary magnets 24 and 25 to cause a magnetic flux. It is possible to suppress a decrease in density.

Next, characteristic effects of the present embodiment will be described.
(1) Since the interpolar magnets 26 and 27 are arranged in a mode having a gap K in the radial direction with the first and second rotor cores 21 and 22, the short-circuit magnetic flux to the inner side in the radial direction of the interpolar magnets 26 and 27 is generated. The motor output can be increased by effectively using the magnetic fluxes of the interpolar magnets 26 and 27 by reducing the magnetic force.

  (2) The radial length L of the air gap K is configured so that 0 <L / G ≦ 4.5, where G is the air gap between the stator 6 facing the rotor cores 21 and 22. As shown in FIG. 5, the torque (output) as a motor can be increased.

(3) The length L in the radial direction of the gap K is configured to satisfy 1.5 ≦ L / G, so that a reverse magnetic field acts on the back auxiliary magnet to cause a decrease in magnetic flux density. Can be suppressed.
(4) The length L of the gap K is configured to satisfy 1.5 ≦ L / G ≦ 3.5, so that the torque (output) as a motor is maintained in a high range as shown in FIG. can do.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, although not particularly mentioned, a nonmagnetic member may be disposed in the gap K. Even in such a configuration, since the member disposed in the gap K is a magnetic body, the short-circuit magnetic flux radially inward of the interpole magnets 26 and 27 is reduced, and the magnetic flux of the interpole magnets 26 and 27 is reduced. Can be used effectively to increase the motor output.

  In the above embodiment, one annular magnet 23 is used as the field magnet, but a plurality of divided permanent magnets are arranged between the first and second core bases 21a and 22a around the rotating shaft 12. A configuration may be adopted.

In the above embodiment, although not particularly mentioned, the first and second rotor cores 21 and 22 and the armature core 7 may be configured by, for example, lamination of magnetic metal plate materials or molding of magnetic powder.
In the above embodiment, no particular reference is made to the method of winding the winding around the teeth of the stator 6, but concentrated winding or distributed winding may be used.

  DESCRIPTION OF SYMBOLS 1 ... Motor, 6 ... Stator, 11 ... Rotor, 21 ... 1st rotor core, 21, 22 ... 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 ... 2nd claw-shaped magnetic pole, 24 ... 1st back auxiliary magnet as an auxiliary magnet, 25 ... 2nd back auxiliary magnet as an auxiliary magnet, 26, 27 ... Interpole magnet, K ... Voids.

Claims (6)

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 field magnet that causes the magnetic pole to function as a second magnetic pole;
An interpole magnet disposed between the first claw-shaped magnetic pole and the circumferential direction of the second claw-shaped magnetic pole and magnetized to have the same pole as the first and second claw-shaped magnetic poles;
A rotor including auxiliary magnets arranged on the back surfaces of the first and second claw-shaped magnetic poles and magnetized so that the same polarity as the first and second magnetic poles is radially outward;
The interpolar magnet is arranged in a mode having a gap in the radial direction with the first and second rotor cores ,
The gap between the interpole magnet and the first rotor core is formed by the interpole magnet, the first core base on the radially inner side of the interpole magnet, and the interpole magnet. Formed between the first claw-shaped magnetic pole adjacent in the circumferential direction and the auxiliary magnet disposed on the back surface of the second claw-shaped magnetic pole adjacent in the circumferential direction of the interpole magnet;
The gap between the interpolar magnet and the second rotor core is, as viewed from the axial direction, the interpolar magnet, the second core base radially inward of the interpolar magnet, and the interpolar magnet. said second claw-shaped magnetic poles that are adjacent in the circumferential direction, and wherein the Rukoto formed between the auxiliary magnets located on the back of the first claw-shaped magnetic poles that are adjacent in the circumferential direction of the polar between the magnets Rotor. The rotor according to claim 1, wherein
The rotor is characterized in that the radial length L of the air gap is such that 0 <L / G ≦ 4.5, where G is an air gap between the stator and the stator facing the rotor core. The rotor according to claim 1 or 2,
The rotor is characterized in that the radial length L of the air gap is 1.5 ≦ L / G where G is an air gap between the stator and the stator facing the rotor core. The rotor according to claim 2 or 3,
The length L of the air gap is configured to satisfy 1.5 ≦ L / G ≦ 3.5. In the rotor according to any one of claims 1 to 4,
The first and second rotor cores are formed by arranging a nonmagnetic material in the gap.   A motor comprising the rotor according to claim 1.