WO2013047076A1

WO2013047076A1 - Rotating electric machine

Info

Publication number: WO2013047076A1
Application number: PCT/JP2012/071981
Authority: WO
Inventors: 朝賀崇; 加藤秀彰; 鈴木勝巳
Original assignee: アイシン精機株式会社
Priority date: 2011-09-28
Filing date: 2012-08-30
Publication date: 2013-04-04
Also published as: JP2013074743A

Abstract

Provided is a rotating electric machine in which torque ripple is reduced by increasing the number of poles of permanent magnets without increasing the number of core teeth. The rotating electric machine is provided with: a rotary shaft; a rotor that includes permanent magnets arranged in an annular pattern in the circumferential direction with the positive and negative magnetic poles formed alternately; an outer stator that is provided on the outer periphery of the rotor and includes multiple outer stator core teeth and outer stator windings; and an inner stator that is provided on the inner periphery of the rotor and includes multiple inner stator core teeth and inner stator windings. The number of the outer stator core teeth is the same as that of the inner stator core teeth. The outer stator windings and the inner stator windings are arranged such that a three-phase alternating current is applied to the outer stator windings and the inner stator windings, and when powered in the same phase, the outer stator winding and the inner stator winding are shifted from each other by an electric angle of 360˚, and the inner stator core teeth face slot apertures of adjoining outer stator core teeth.

Description

Rotating electric machine

The present invention relates to a double stator type rotating electrical machine including one rotor and two stators arranged so as to sandwich the rotor.

Conventionally, a double-stator type rotating electrical machine having two stators arranged so as to sandwich one rotor is known. For example, Patent Document 1 discloses a double stator brushless motor. This includes a casing that covers the outer periphery, a bearing that is incorporated in the casing, a shaft that is incorporated in the bearing and that rotates uniaxially with respect to the casing, a rotor that is attached to the shaft, and an outer stator that is disposed outside the rotor. And an inner stator disposed inside the rotor.

The rotor is provided with a field magnet (permanent magnet) that is polarized in the radial direction to the N pole and the S pole and that the polarization directions of adjacent poles are opposite to each other. The outer stator has an outer periphery attached to the casing, and has a plurality of core teeth protruding toward the rotor so as to face the field magnet. The inner stator has a plurality of core teeth that are attached to the casing and project toward the rotor so as to face the field magnet. The number of core teeth of the outer stator and the number of core teeth of the inner stator are the same, and are arranged at positions facing each other across the rotor.

Patent Document 2 also discloses a double stator type rotating electric machine. This rotating electrical machine is arranged so as to be opposed to each stator with a predetermined gap between the one side stator and the other side stator, which are two stators fixed to a casing, and both stators. And a single rotor.

Both stators are provided with a plurality of core teeth so as to protrude toward the rotor, and a stator winding is wound around each core tooth. Each stator winding is provided with concentrated winding in which windings of different phases are wound between adjacent core teeth. The stator windings of the same phase in the one-side stator and the other-side stator are arranged such that the direction of generation of magnetic flux by the windings is opposite to the rotor and is deviated by 180 degrees in electrical angle.

The rotor includes a disk-shaped rotor conductor and permanent magnets provided at equally spaced positions in a plurality of circumferential directions of the rotor conductor. By adopting such a configuration, the spatial harmonic magnetic flux included in the magnetic flux generated by the two stators during rotation can be canceled out by the rotor, and the magnetomotive force harmonic can be reduced.

Japanese Patent Laid-Open No. 3-139156 JP 2009-247046 A

As described above, in the double stator type rotating electric machine, it is possible to increase the total cross-sectional area of the winding slot by arranging the stators on both sides of the rotor, and the torque is increased as compared with the single stator type rotating electric machine. . However, in the brushless motor described in Patent Document 1, since the outer stator and the inner stator are opposed to each other, the slot opening at the adjacent core tooth tip of the outer rotor has the slot opening at the adjacent core tooth tip of the inner rotor. opposite. Since no torque is generated at the slot opening, the waveform is distorted and the torque ripple is increased even if the torque is increased. In order to reduce the torque ripple, it is necessary to increase the number of poles of the permanent magnet or to narrow the slot opening width of the tip portion of the core teeth.

However, when the number of poles of the permanent magnet is increased, the number of core teeth is increased accordingly, so that the winding space is reduced and the total sectional area of the winding slot is reduced. Moreover, if the slot opening width is narrowed, the nozzle for winding the winding or the winding itself cannot be passed through the core teeth, and it is necessary to divide the stator core to wind the winding. It will lead to cost increase.

In the rotating electrical machine described in Patent Document 2, magnetomotive force harmonics can be reduced, but if the number of poles of the permanent magnet is increased without increasing the core teeth, the torque is canceled and the rotation becomes impossible. The number of poles cannot be increased, and torque ripple cannot be reduced.

An object of the present invention is to provide a rotating electrical machine that reduces the torque ripple by increasing the number of poles of a permanent magnet without increasing the number of core teeth.

In order to achieve the above object, the characteristic configuration of the rotating electrical machine according to the present invention includes a rotating shaft and a plurality of magnetic pole pairs that rotate concentrically and integrally with the rotating shaft, and in which positive and negative magnetic poles are alternately formed in the circumferential direction. A rotor including an annular magnet body; a plurality of first stator core teeth disposed concentrically with the rotating shaft and radially outward of the rotor; and projecting toward the rotor; A first stator including a first winding wound so as to generate a rotating magnetic field in each of the stator core teeth, and disposed concentrically with the rotating shaft and radially inward of the rotor A plurality of second stator core teeth projecting toward the rotor and a second winding wound to generate a rotating magnetic field in each of the second stator core teeth; A second stator including The number of the stator core teeth and the number of the second stator core teeth are the same, and a three-phase alternating current is applied to the first winding and the second winding, and the first winding The first stator core teeth and the second stator core teeth are arranged such that the phase when the current is applied to the second winding and the second winding is shifted by an integral multiple of 360 degrees in electrical angle and the in-phase stator core teeth do not face each other. There are two stator core teeth.

With such a configuration, the number of poles of the permanent magnet can be increased while maintaining the number of stator core teeth as compared with the rotating electrical machines of Patent Documents 1 and 2. Thereby, torque ripple can be reduced. When the number of poles of the permanent magnet is the same, the number of stator core teeth can be halved, so that the winding cross-sectional area of the first and second stators can be increased and torque ripple can be increased while increasing the torque. Can be suppressed.

In the rotating electrical machine according to the present invention, it is preferable that the second stator core teeth are arranged so as to face each other between the adjacent first stator core teeth. With this configuration, since the second stator core teeth are opposed to the slot openings of the adjacent first stator core teeth, the first and second fixings are always performed when the rotor is rotating. A suction repulsive force is generated between the child and the torque ripple is reduced.

Further, in the rotating electrical machine according to the present invention, the distal end portion of the first stator core teeth and the distal end portion of the second stator core teeth closest to the first stator core teeth overlap in the radial direction. It is preferable to do so. With such a configuration, leakage of magnetic flux from the stator core teeth is reduced, and it is possible to prevent a reduction in torque characteristics of the rotating electrical machine.

In the rotating electrical machine according to the present invention, the direction of the radial magnetic flux generated in the first winding and the direction of the radial magnetic flux generated in the second winding when energized in the same phase are the same. It is preferable. With this configuration, the phase of the first winding and the second winding when energized in phase is shifted by an integral multiple of 360 degrees in electrical angle so that the stator core teeth in phase do not face each other. When the first stator core teeth and the second stator core teeth are arranged, the suction repulsive force between the rotor and the first and second stators so as to rotate the rotor in the same direction. Therefore, the rotating electrical machine can be smoothly rotated.

Also, in the rotating electrical machine according to the present invention, it is preferable that the first stator core teeth and the second stator core teeth are arranged 30 degrees apart from each other in the circumferential direction.

Moreover, the rotating electrical machine according to the present invention includes an end portion adjacent in the circumferential direction at the tip end portion of the adjacent first stator core teeth, and the tip end of the second stator core teeth facing the end portion. It is preferable that the end portions on both sides in the circumferential direction of the portion overlap when viewed radially outward from the center of the rotating shaft.

In the rotating electrical machine according to the present invention, the second winding having the same phase as each phase of the first winding of the first stator is connected in series, and 360 degrees in electrical direction in the circumferential direction. It is suitable that it is wound so as to deviate.

The rotating electrical machine according to the present invention includes an outer periphery of the magnet body and a front end portion of the first stator core teeth, and an inner periphery of the magnet body and a front end portion of the second stator core teeth. It is preferable that the gaps are opposed to each other via a gap in the radial direction.

These are sectional drawings showing the structure of the rotary electric machine in embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is an enlarged view of a region III in FIG. 2. These are figures which show the waveform of 3 phase alternating current. These are figures which show the energization state to each stator winding | coil of U phase, V phase, and W phase in embodiment of this invention. These are figures which show the energization state to each stator winding | coil of U phase, V phase, and W phase in embodiment of this invention. These are figures which show the energization state to each stator winding | coil of U phase, V phase, and W phase in embodiment of this invention. These are figures which show the energization state to each stator winding | coil of U phase, V phase, and W phase in embodiment of this invention. These are figures which show the energization state to each stator winding | coil of U phase, V phase, and W phase in embodiment of this invention. These are figures which show the energization state to each stator winding | coil of U phase, V phase, and W phase in embodiment of this invention. These are figures explaining operation | movement of the rotary electric machine in embodiment of this invention. These are figures explaining operation | movement of the rotary electric machine in embodiment of this invention. These are figures explaining operation | movement of the rotary electric machine in embodiment of this invention. These are figures explaining operation | movement of the rotary electric machine in embodiment of this invention. These are figures explaining operation | movement of the rotary electric machine in embodiment of this invention. These are figures explaining operation | movement of the rotary electric machine in embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing a rotating electrical machine 10 according to the present embodiment. FIG. 2 is a sectional view taken along line II-II in FIG. A rotating electrical machine 10 shown in FIG. 1 rotates integrally with a case 15, an outer stator 13 and an inner stator 14 accommodated in the case 15, a rotary shaft 11 that is rotatable relative to the case 15, and the rotary shaft 11. And a bearing 16 a and 16 b for pivotally supporting the rotating shaft 11 on the case 15 and the end cover 17.

The case 15 has a bottomed cylindrical shape, and the opening side is closed by a disc-shaped end cover 17.

Bearings

16a and 16b are attached to the center of the bottom of the case 15 and the center of the end cover 17, respectively. As shown in FIG. 2, an annular outer stator 13 and an inner stator 14 that are disposed opposite to each other in the radial direction are accommodated inside the case 15, and both of their central axes are rotating shafts. 11 coincides with the central axis.

The outer stator 13 is composed of an outer stator core 13a and an outer stator winding 13b, and the outer stator core 13a has a structure in which a plurality of electromagnetic steel plates are laminated. The outer stator core 13a has an outer peripheral surface fixed to the inner peripheral surface of the case 15, and six outer stator core teeth 13c protrude radially inward. Each of the outer stator core teeth 13c has a substantially T shape with a distal end extending in the circumferential direction (hereinafter, the distal end is referred to as a distal facing portion 13d). The six outer stator core teeth 13c are provided at equal angular intervals of 60 degrees in the circumferential direction, and an outer stator winding 13b is wound around each outer stator core tooth 13c. There is a gap (slot opening) in the circumferential direction between adjacent tip facing portions 13d.

The inner stator 14 includes an inner stator core 14a and an inner stator winding 14b, and the inner stator core 14a has a configuration in which a plurality of electromagnetic steel plates are laminated. The inner stator core 14a is fixed to a substantially cylindrical fixing member 18 disposed in the case 15, and six inner stator core teeth 14c protrude outward in the radial direction. Each of the inner stator core teeth 14c has a substantially T shape with a distal end portion extending in the circumferential direction (hereinafter, the distal end portion is referred to as a distal end facing portion 14d). The six inner stator core teeth 14c are provided at equal angular intervals of 60 degrees in the circumferential direction, and an inner stator winding 14b is wound around each inner stator core tooth 14c. There is a gap (slot opening) in the circumferential direction between adjacent tip facing portions 14d. By having two stators of the outer stator 13 and the inner stator 14 in this way, it is possible to increase the winding cross-sectional area by applying more windings than in the case of one stator. The torque can be increased and the increase in torque ripple can be suppressed.

The outer stator 13 and the inner stator 14 have the same axial height, and the inner stator core teeth 14c are arranged in the middle of the outer stator core teeth 13c in the circumferential direction. That is, the outer stator core teeth 13c and the inner stator core teeth 14c are arranged 30 degrees apart from each other in the circumferential direction. With this configuration, the inner stator core teeth 14c face the slot openings of the adjacent outer stator core teeth 13c, so that the outer stator 13 and the inner stator are always in rotation when the rotor 12 is rotating. An attractive repulsive force is generated between the permanent magnet 14 and the permanent magnet 12a, and the torque ripple is reduced.

As shown in FIG. 3, the end in the circumferential direction of each tip facing portion 13 d and the end in the circumferential direction of the tip facing portion 14 d facing each other overlap when viewed from the center of the rotating shaft 11 in the radial direction. Visible (overlapping). Thereby, the leakage of the magnetic flux at the time of rotation decreases and there exists an effect which reduces a torque ripple.

The outer stator windings 13b wound around the outer stator core teeth 13c are classified into three phases of U phase, V phase, and W phase, and every two in the circumferential direction (that is, every 180 degrees) have the same phase. It has become. As shown in FIG. 4, a three-phase alternating current having a phase difference of 120 degrees is supplied to each phase. Similarly, the inner stator windings 14b wound around the inner stator core teeth 14c are also classified into three phases of U phase, V phase, and W phase, and the same in every other circumferential direction (that is, every 180 degrees). It is in phase. As shown in FIG. 4, a three-phase alternating current having a phase difference of 120 degrees is supplied to each phase.

The inner stator winding 14b having the same phase as each phase of the outer stator winding 13b is connected in series, and is wound around the electrical angle by 360 degrees in the circumferential direction. In the present embodiment, this corresponds to a mechanical angle of 90 degrees. The outer stator winding 13b and the inner stator winding 14b are wound so that a magnetic flux in the same direction is generated in the radial direction when an alternating current is applied.

In this embodiment, all the outer stator windings 13b and the inner stator windings 14b having the same phase are connected in series. However, when there are a plurality of outer stator windings 13b having the same phase, each outer stator winding 13b is connected in series. The winding 13b may be connected in parallel. When there are a plurality of in-phase inner stator windings 14b, the inner stator windings 14b may be connected in parallel. The outer stator winding 13b and the inner stator winding 14b having the same phase are preferably connected in series because they have the same current value to be energized from the viewpoint of balance, but may be connected in parallel. By connecting in parallel, the electrical resistance of the entire winding decreases and the current flowing in the winding increases, so that the generated torque can be increased.

The rotary shaft 11 is press-fitted into the inner rings of the

bearings

16 a and 16 b and is rotatable with respect to the case 15. The rotor 12 has a bottomed cylindrical rotor conductor 12b that is press-fitted and fixed to the rotating shaft 11, and is attached to the rotor conductor 12b and has eight poles so that N and S poles are alternately arranged in the circumferential direction. It consists of a permanent magnet 12a magnetized in a quadrupole pair) and rotates integrally with the rotary shaft 11. The rotor conductor 12 b has an outer diameter of the bottom 12 c that is slightly smaller than the innermost circumference of the outer stator 13, and its central axis coincides with the central axis of the rotary shaft 11.

The permanent magnet 12 a has a substantially annular shape, and its central axis coincides with the central axis of the rotary shaft 11. Further, the outer periphery and the inner periphery of the permanent magnet 12a are opposed to each other with a radial gap between the tip facing portion 13d of the outer stator 13 and the tip facing portion 14d of the inner stator 14. The thickness of the permanent magnet 12a is equal to the axial thickness of the outer stator core 13a and the inner stator core 14a, and one end face of the permanent magnet 12a is the end of the cylindrical portion 12d of the rotor conductor 12b. It is fixed by bonding or the like to the part.

Next, the rotation of the rotor 12 when a three-phase alternating current is applied to the rotating electrical machine 10 according to the present embodiment will be described with reference to FIGS. 4 to 6F. FIG. 4 shows the direction and magnitude of the alternating current that is passed through the U, V, and W phases while the electrical angle is 360 degrees, that is, the rotor 12 is rotated 90 degrees. , Current flowing in each phase of W. In FIG. 4, when the direction of the magnetic flux generated when the outer stator winding 13b and the inner stator winding 14b are energized is positive in the radial direction, the current direction is positive, The current direction is negative. FIGS. 5A to 5F show states of energization to the outer stator winding 13b and the inner stator winding 14b of each phase between electrical angles of 360 degrees. 6A to 6F show the attractive repulsion force generated between the permanent magnet 12a, each outer stator core tooth 13c, and each inner stator core tooth 14c during an electrical angle of 360 degrees.

4A and FIG. 5A and FIG. 6A show that the same reference numerals A in FIG. 4 to FIG. 6F correspond to the region A in FIG. That is, when energized as in the area A of FIG. 4, current flows through the outer stator winding 13b and the inner stator winding 14b as shown in FIG. 5A. FIG. 6A shows a state at the moment of switching to the region A of FIG. 4, and an attractive repulsive force is generated between the permanent magnet 12 a and each outer stator core tooth 13 c and each inner stator core tooth 14 c. Yes. It is shown that the codes B to F correspond to the code A as well. The method of connecting the phases in the present embodiment is Y connection, but may be delta connection.

FIG. 6A shows a state when a positive current is supplied to the U phase and a negative current is supplied to the V phase. In the figure, the arrow drawn on the stator core teeth indicates the direction of the generated magnetic flux. At this time, a magnetic flux is generated radially outward in the U-phase outer stator core teeth 13c, and the tip facing portion 13d is magnetized to the S pole and the radially outer side as viewed from the tip facing portion 13d is magnetized to the N pole. The permanent magnet 12a faces the tip facing portion 13d in a state where the clockwise half is S-pole and the counterclockwise half is N-pole. Therefore, between the U-phase tip facing portion 13d and the permanent magnet 12a, a repulsive force is generated in the clockwise half and an attractive force is generated in the counterclockwise half, and a force that rotates the permanent magnet 12a in the clockwise direction acts.

The U-phase inner stator core teeth 14c connected in series with the U-phase outer stator core teeth 13c are 360 degrees in electrical angle with respect to the outer stator core teeth 13c, that is, 90 degrees clockwise in mechanical angle. It is arranged at a deviated degree. The U-phase inner stator core teeth 14c also generate a magnetic flux radially outward, and the tip facing portion 14d is magnetized to the N pole, and the radially inner side as viewed from the tip facing portion 14d is magnetized to the S pole. Since the permanent magnet 12a is magnetized to 8 poles, the angle formed by one pole pair is 90 degrees. Therefore, the N pole and the S pole of the permanent magnet 12a are also opposed to the tip facing portion 14d by half, and the clockwise half of the permanent magnet 12a is the N pole and the counterclockwise half is the S pole. An attractive repulsive force that rotates the permanent magnet 12a in the clockwise direction is also generated between the tip facing portion 14d and the permanent magnet 12a.

In the V-phase outer stator core teeth 13c, magnetic flux is generated inward in the radial direction, and the tip facing portion 13d is magnetized to the N pole, and the radially outer side as viewed from the tip facing portion 13d is magnetized to the S pole. The V-phase outer stator core teeth 13c are offset by a mechanical angle of 60 degrees in the clockwise direction with respect to the U-phase outer stator core teeth 13c, and the N pole of the permanent magnet 12a faces the V-phase tip facing portion 13d. Repulsive force is generated. This repulsive force acts in the direction of rotating the permanent magnet 12a in the clockwise direction.

The V-phase inner stator core teeth 14c connected in series with the V-phase outer stator core teeth 13c are 360 degrees in electrical angle with respect to the outer stator core teeth 13c, that is, 90 degrees clockwise in mechanical angle. It is arranged at a position shifted by degrees. The V-phase inner stator core teeth 14c also generate a magnetic flux radially inward, and the tip facing portion 14d is magnetized to the S pole and the radially inner side as viewed from the tip facing portion 14d is magnetized to the N pole. Since one pole pair of the permanent magnet 12a is 90 degrees, the south pole of the permanent magnet 12a faces the tip facing portion 14d of the V phase and a repulsive force is generated. This repulsive force also acts in the direction of rotating the permanent magnet 12a in the clockwise direction.

FIG. 6B shows a state when energization is switched and a positive current is applied to the W phase and a negative current is applied to the V phase. At this time, the V-phase outer stator core teeth 13c are continuously magnetized with the N-pole at the tip facing portion 13d and the S-pole at the radially outer side as viewed from the tip facing portion 13d. The permanent magnet 12a is rotated 15 degrees clockwise from the state of FIG. 6A, and faces the tip facing portion 13d in a state where the clockwise half is N pole and the counterclockwise half is S pole. Therefore, an attractive repulsion force that rotates the permanent magnet 12a in the clockwise direction is generated between the V-phase tip facing portion 13d and the permanent magnet 12a.

In the V-phase inner stator core teeth 14c connected in series with the V-phase outer stator core teeth 13c, the tip facing portion 14d is continuously magnetized to the S pole, and the radially inner side as viewed from the tip facing portion 14d is magnetized to the N pole. Has been. The permanent magnet 12a faces the tip facing portion 14d in a state where the clockwise half is the south pole and the counterclockwise half is the north pole. Therefore, an attractive repulsion force that rotates the permanent magnet 12a in the clockwise direction is generated between the V-phase tip facing portion 14d and the permanent magnet 12a.

In the W-phase outer stator core teeth 13c, a magnetic flux is generated radially outward, and the tip facing portion 13d is magnetized to the S pole, and the radially outer side as viewed from the tip facing portion 13d is magnetized to the N pole. The outer stator core teeth 13c of the W phase are offset by 60 degrees in the clockwise direction with respect to the outer stator core teeth 13c of the V phase, and the south pole of the permanent magnet 12a faces the tip facing portion 13d of the W phase. Repulsive force is generated. This repulsive force acts in the direction of rotating the permanent magnet 12a in the clockwise direction.

The W-phase inner stator core teeth 14c connected in series with the W-phase outer stator core teeth 13c are 360 degrees in electrical angle with respect to the outer stator core teeth 13c, that is, 90 degrees clockwise in mechanical angle. It is arranged at a position shifted by degrees. The W-phase inner stator core teeth 14c also generate magnetic fluxes radially outward, and the tip facing portion 14d is magnetized to the N pole, and the radially inner side as viewed from the tip facing portion 14d is magnetized to the S pole. Since one pole pair of the permanent magnet 12a is 90 degrees, the N pole of the permanent magnet 12a faces the tip facing portion 14d of the W phase and a repulsive force is generated. This repulsive force also acts in the direction of rotating the permanent magnet 12a in the clockwise direction.

FIG. 6C shows a state in which energization is switched, and a positive current is applied to the W phase and a negative current is applied to the U phase. At this time, the W-phase outer stator core teeth 13c are continuously magnetized with the S-pole at the tip facing portion 13d and the N-pole at the radially outer side as viewed from the tip facing portion 13d. From the state of FIG. 6B, the permanent magnet 12a is further rotated by 15 degrees in the clockwise direction, and faces the tip facing portion 13d with the clockwise half on the S pole and the counterclockwise half on the N pole. Therefore, an attractive repulsion force that rotates the permanent magnet 12a in the clockwise direction is generated between the W-phase tip facing portion 13d and the permanent magnet 12a.

In the W-phase inner stator core teeth 14c connected in series with the W-phase outer stator core teeth 13c, the tip facing portion 14d is continuously magnetized to the N pole, and the radially inner side as viewed from the tip facing portion 14d is magnetized to the S pole. Has been. Since the permanent magnet 12a has an N-pole on the clockwise side and an S-pole on the counterclockwise half, an attractive repulsive force that rotates the permanent magnet 12a in the clockwise direction also between the W-phase tip facing portion 14d and the permanent magnet 12a. appear.

In the U-phase outer stator core teeth 13c, a magnetic flux is generated inward in the radial direction, and the tip facing portion 13d is magnetized to the N pole, and the radially outer side as viewed from the tip facing portion 13d is magnetized to the S pole. The U-phase outer stator core teeth 13c are offset by 60 degrees in the clockwise direction with respect to the W-phase outer stator core teeth 13c, and the N pole of the permanent magnet 12a faces the U-phase tip facing portion 13d. Repulsive force is generated. This repulsive force acts in the direction of rotating the permanent magnet 12a in the clockwise direction.

The U-phase inner stator core teeth 14c connected in series with the U-phase outer stator core teeth 13c are 360 degrees in electrical angle with respect to the outer stator core teeth 13c, that is, 90 degrees clockwise in mechanical angle. It is arranged at a position shifted by degrees. The U-phase inner stator core teeth 14c also generate a magnetic flux radially inward, and the tip facing portion 14d is magnetized to the S pole, and the radially inner side as viewed from the tip facing portion 14d is magnetized to the N pole. Since one pole pair of the permanent magnet 12a is 90 degrees, the south pole of the permanent magnet 12a faces the tip facing portion 14d of the U phase and a repulsive force is generated. This repulsive force also acts in the direction of rotating the permanent magnet 12a in the clockwise direction.

FIG. 6D shows a state when energization is switched and a positive current is applied to the V phase and a negative current is applied to the U phase. At this time, the U-phase outer stator core teeth 13c are continuously magnetized with the N-pole at the tip facing portion 13d and the S-pole at the radially outer side as viewed from the tip facing portion 13d. The permanent magnet 12a is rotated 15 degrees clockwise from the state of FIG. 6C, and faces the tip facing portion 13d in a state where the clockwise half is N pole and the counterclockwise half is S pole. Therefore, an attractive repulsion force that rotates the permanent magnet 12a in the clockwise direction is generated between the U-phase tip facing portion 13d and the permanent magnet 12a.

In the U-phase inner stator core teeth 14c connected in series with the U-phase outer stator core teeth 13c, the tip facing portion 14d is continuously magnetized to the S pole, and the radially inner side as viewed from the tip facing portion 14d is magnetized to the N pole. Has been. The permanent magnet 12a faces the tip facing portion 14d in a state where the clockwise half is the south pole and the counterclockwise half is the north pole. Therefore, an attractive repulsion force that rotates the permanent magnet 12a in the clockwise direction is generated between the U-phase tip facing portion 14d and the permanent magnet 12a.

In the V-phase outer stator core teeth 13c, a magnetic flux is generated radially outward, and the tip facing portion 13d is magnetized to the S pole, and the radially outer side as viewed from the tip facing portion 13d is magnetized to the N pole. The V-phase outer stator core teeth 13c are offset by a mechanical angle of 60 degrees in the clockwise direction with respect to the U-phase outer stator core teeth 13c, and the S pole of the permanent magnet 12a faces the V-phase tip facing portion 13d. Repulsive force is generated. This repulsive force acts in the direction of rotating the permanent magnet 12a in the clockwise direction.

The V-phase inner stator core teeth 14c connected in series with the V-phase outer stator core teeth 13c also generate a magnetic flux outward in the radial direction, and the tip facing portion 14d has an N pole and the tip facing portion 14d. The inner side in the radial direction is magnetized to the south pole. Since one pole pair of the permanent magnet 12a is 90 degrees, the N pole of the permanent magnet 12a faces the V-phase tip facing portion 14d and a repulsive force is generated. This repulsive force also acts in the direction of rotating the permanent magnet 12a in the clockwise direction.

FIG. 6E shows a state in which energization is switched and a positive current is applied to the V phase and a negative current is applied to the W phase. At this time, in the V-phase outer stator core teeth 13c, the tip facing portion 13d is continuously magnetized to the S pole, and the radially outer side as viewed from the tip facing portion 13d is magnetized to the N pole. From the state of FIG. 6D, the permanent magnet 12a is further rotated 15 degrees clockwise, and faces the tip facing portion 13d in a state where the clockwise half is the S pole and the counterclockwise half is the N pole. Therefore, an attractive repulsive force that rotates the permanent magnet 12a in the clockwise direction is generated between the V-phase tip facing portion 13d and the permanent magnet 12a.

In the V-phase inner stator core teeth 14c connected in series with the V-phase outer stator core teeth 13c, the tip facing portion 14d is continuously magnetized to the N pole, and the radially inner side as viewed from the tip facing portion 14d is magnetized to the S pole. Has been. Since the permanent magnet 12a has an N pole on the clockwise side and an S pole on the counterclockwise half, the attractive repulsive force that rotates the permanent magnet 12a in the clockwise direction is also between the V-phase tip facing portion 14d and the permanent magnet 12a. appear.

In the W-phase outer stator core teeth 13c, a magnetic flux is generated inward in the radial direction, and the tip facing portion 13d is magnetized to the N pole, and the radially outer side as viewed from the tip facing portion 13d is magnetized to the S pole. The U-phase outer stator core teeth 13c are offset by 60 degrees in the clockwise direction with respect to the W-phase outer stator core teeth 13c, and the N pole of the permanent magnet 12a faces the U-phase tip facing portion 13d. Repulsive force is generated. This repulsive force acts in the direction of rotating the permanent magnet 12a in the clockwise direction.

The W-phase inner stator core teeth 14c connected in series with the W-phase outer stator core teeth 13c also generate a magnetic flux inward in the radial direction, and the tip facing portion 14d has an S pole and the tip facing portion 14d. The inner side in the radial direction is magnetized to the N pole. Since one pole pair of the permanent magnet 12a is 90 degrees, the south pole of the permanent magnet 12a faces the tip facing portion 14d of the U phase and a repulsive force is generated. This repulsive force also acts in the direction of rotating the permanent magnet 12a in the clockwise direction.

FIG. 6F shows a state when energization is switched and a positive current is applied to the U phase and a negative current is applied to the W phase. At this time, the W-phase outer stator core teeth 13c are continuously magnetized with the N-pole at the tip facing portion 13d and the S-pole at the radially outer side as viewed from the tip facing portion 13d. The permanent magnet 12a is rotated 15 degrees clockwise from the state of FIG. 6E, and faces the tip facing portion 13d in a state where the clockwise half is N pole and the counterclockwise half is S pole. Therefore, an attractive repulsive force that rotates the permanent magnet 12a in the clockwise direction is generated between the W-phase tip facing portion 13d and the permanent magnet 12a.

In the W-phase inner stator core teeth 14c connected in series with the W-phase outer stator core teeth 13c, the tip facing portion 14d continues to be magnetized to the S pole and the radially inner side as viewed from the tip facing portion 14d is magnetized to the N pole. Has been. The permanent magnet 12a faces the tip facing portion 14d in a state where the clockwise half is the south pole and the counterclockwise half is the north pole. Therefore, an attractive repulsive force that rotates the permanent magnet 12a in the clockwise direction is generated between the W-phase tip facing portion 14d and the permanent magnet 12a.

In the U-phase outer stator core teeth 13c, a magnetic flux is generated radially outward, and the tip facing portion 13d is magnetized to the S pole, and the radially outer side as viewed from the tip facing portion 13d is magnetized to the N pole. The U-phase outer stator core teeth 13c are offset by a mechanical angle of 60 degrees clockwise with respect to the W-phase outer stator core teeth 13c, and the south pole of the permanent magnet 12a faces the tip facing portion 13d of the V-phase. Repulsive force is generated. This repulsive force acts in the direction of rotating the permanent magnet 12a in the clockwise direction.

The U-phase inner stator core teeth 14c connected in series with the U-phase outer stator core teeth 13c also generate a magnetic flux outward in the radial direction, and the tip facing portion 14d has an N pole and the tip facing portion 14d. The inner side in the radial direction is magnetized to the south pole. Since one pole pair of the permanent magnet 12a is 90 degrees, the N pole of the permanent magnet 12a faces the V-phase tip facing portion 14d and a repulsive force is generated. This repulsive force also acts in the direction of rotating the permanent magnet 12a in the clockwise direction.

The rotor 12 of the rotating electrical machine 10 according to the present embodiment continuously rotates in the clockwise direction by repeating the operations of FIGS. 6A to 6F.

The rotary electric machine 10 according to the present embodiment is a radial gap type, but is not limited to this and may be an axial gap type. Further, the number of outer stator core teeth 13c and inner stator core teeth 14c is not limited to six, and the number of poles in the circumferential direction of the permanent magnet 12a is not limited to eight. However, it is preferable that the outer stator core teeth 13c and the inner stator core teeth 14c have the same number, and the sum of the numbers is three times the number of pole pairs of the permanent magnet 12a.

In the present embodiment, the outer stator winding 13b and the inner stator winding 14b are arranged to be shifted by 360 degrees in electrical angle in the circumferential direction, but may be shifted by an odd multiple of 360 degrees such as 1080 degrees. If it does in this way, since it arrange | positions so that the inner side stator core teeth 14c may oppose the slot opening of the adjacent outer side stator core teeth 13c, there exists an effect which a torque ripple is reduced.

The present invention can be used for a double stator type rotating electric machine.

DESCRIPTION OF SYMBOLS 10 Rotating electric machine 11 Rotating shaft 12 Rotor 12a Permanent magnet 12b Rotor conductor 13 Outer stator 13a Outer stator core 13b Outer stator winding 14 Inner stator 14a Inner stator core 14b Inner stator winding 15

Case

16a , 16b Bearing 17 End cover 18 Fixing member

Claims

A rotation axis;
A rotor including an annular magnet body that rotates concentrically and integrally with the rotating shaft and has a plurality of magnetic pole pairs in which positive and negative magnetic poles are alternately formed in the circumferential direction;
A rotating magnetic field is provided on each of the plurality of first stator core teeth and the first stator core teeth, which are arranged concentrically with the rotating shaft and radially outward of the rotor and project toward the rotor. A first stator including a first winding wound to generate
A rotating magnetic field is provided on each of a plurality of second stator core teeth and the second stator core teeth that are concentric with the rotating shaft and arranged radially inward of the rotor and project toward the rotor. A second stator including a second winding wound to generate
The number of the first stator core teeth and the number of the second stator core teeth are the same,
A three-phase alternating current is energized in the first winding and the second winding, and the phase when the first phase and the second winding are energized in the same phase is 360 degrees in electrical angle. A rotating electrical machine in which the first stator core teeth and the second stator core teeth are arranged so that the stator core teeth in phase and in phase with each other do not face each other.
The rotating electrical machine according to claim 1, wherein the second stator core teeth are arranged so as to face each other between the first stator core teeth adjacent to each other.
The tip of the first stator core teeth and the tip of the second stator core teeth closest to the first stator core teeth overlap in the radial direction. Rotating electric machine.
2. The rotating electrical machine according to claim 1, wherein a direction of a radial magnetic flux generated in the first winding and a direction of a radial magnetic flux generated in the second winding when energized in the same phase are the same. .
The rotating electrical machine according to claim 1, wherein the first stator core teeth and the second stator core teeth are arranged so as to be shifted by 30 degrees in the circumferential direction.
End portions adjacent to each other in the circumferential direction at the tip portion of the adjacent first stator core teeth, and end portions on both sides in the circumferential direction at the tip portion of the second stator core teeth facing the end portion The rotating electrical machine according to claim 3, which overlaps when viewed radially outward from the center of the rotating shaft.
The second winding having the same phase as each phase of the first winding of the first stator is connected in series and wound so as to be shifted by 360 degrees in electrical angle in the circumferential direction. The rotating electrical machine according to claim 1.
There is a gap in the radial direction between the outer periphery of the magnet body and the tip of the first stator core teeth, and between the inner periphery of the magnet body and the tip of the second stator core teeth. The rotating electrical machine according to claim 1, which is opposed to each other via a coil.