JP2009100571A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of increasing torque by making a rotating magnetic field generated at a coil come into effective action by facing a stator and a rotor in diametrical and axial directions, and facilitating coil assembly. <P>SOLUTION: A coil winding portion around which the coil 32 is wound such that a winding center line CL of the coil 32 is inclined to the axial line L of a rotational shaft 14 and first and second facing portions 41, 43 provided on the inner and outer periphery sides of the stator core 31 are formed in a stator core 31. The stator core 31 faces the first and second magnets 22, 24 fixed respectively at the first and second yokes 21, 23 of the rotor on the inner and outer periphery sides in each of the diametrical and axial line L directions. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine intended to increase rotational torque.

  2. Description of the Related Art Conventionally, some rotating electrical machines include a stator in which a coil is wound around a tooth portion protruding in the radial direction, and a rotor having a magnet disposed so as to face the tip of the tooth portion in the radial direction. The rotor is rotated by the rotating magnetic field generated in the coil acting on the magnet via the tip of the tooth portion. In such a rotating electrical machine, for example, Patent Document 1 discloses a rotating torque increase by effectively utilizing both axial end portions of the stator.

In the rotating electrical machine of Patent Document 1, both ends of the coil in the axial direction (coil end portions) are bent at right angles to form a U-shape, and the coil end portion is formed by extending the tooth portion in the axial direction. It is wound so as to be locked. The rotor is formed in a U shape so as to cover the stator, and a magnet facing the stator in the radial direction and the axial direction is fixed to the rotor. Thus, since a coil and a magnet are opposingly arranged by radial direction and an axial direction, rotational torque can be improved. Further, in the rotating electrical machine as in Patent Document 1, since the coil is bent so as to extend in the radial direction at both ends of the stator in the axial direction, the magnet is simply bent at both ends in the axial direction without bending the coil end portion. As compared with the case where the rotating magnetic field is also arranged, the rotating magnetic field can be effectively applied to the magnet at both ends in the axial direction of the stator.
JP 2005-168245 A

  However, in the rotating electric machine as described above, since the coil must be wound so that the coil end portion is locked to the extension portion of the tooth portion, it is very difficult to assemble such a U-shaped coil. Met.

  The present invention has been made in order to solve the above-described problems, and its object is to effectively act on a rotating magnetic field generated in a coil by causing a stator and a rotor to face each other in a radial direction and an axial direction. An object of the present invention is to provide a rotating electrical machine that can easily assemble a coil while increasing torque.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a stator formed in an annular shape by a stator core around which a coil is wound, and a rotor having a rotating shaft arranged on the inner peripheral side of the stator, The rotor is configured to be rotatable by the action of a rotating magnetic field generated in the coil, and the rotor is opposed to the stator in the radial direction and the axial direction on the inner peripheral side and the outer peripheral side of the stator. The provided first and second magnets are provided so as to be integrally rotatable with the rotary shaft, and are provided on the inner peripheral side and the outer peripheral side of the stator core of the stator, respectively, and the first and second magnets have a diameter. The first and second opposing portions facing each other in the direction and the axial direction, and the coil is disposed between the first and second opposing portions so that the winding center line of the coil is inclined with respect to the axis of the rotating shaft But That the wound on the coil winding portion is formed as its gist the.

  In this invention, the coil is wound around the coil winding portion of the stator core so that the winding center line of the coil is inclined with respect to the axis of the rotation shaft, and the opposing portions on the inner peripheral side and the outer peripheral side of the stator core are the rotor. The first and second magnets are opposed to each other in the radial direction and the axial direction. As a result, the rotating magnetic field generated by the coil effectively acts on the magnet not only in the radial direction but also in the axial direction via each facing portion, so that the rotational torque can be improved. At the same time, it is not necessary to wind the coil so that the coil end portion bends in a direction perpendicular to the rotation axis, so that the coil can be easily assembled.

  The invention according to claim 2 is the rotating electrical machine according to claim 1, wherein a plurality of the stator cores are arranged in the circumferential direction, and the coil is assembled to each of the stator cores.

  In the present invention, a plurality of stator cores are provided side by side in the circumferential direction, and a coil is assembled to each of the stator cores. Therefore, the coils can be individually assembled for each stator core, and the assembly becomes easier.

  According to a third aspect of the present invention, in the rotating electric machine according to the first or second aspect, the stator is formed by molding the stator core and the coil with a resin material, and a fixing portion for fixing the stator to the housing. The gist is that it is formed of the resin material.

  In the present invention, since the stator core and the coil are molded of a resin material in the stator, and the fixing portion for fixing the stator to the housing is formed of the resin material, the fixing portion can be easily formed.

The gist of a fourth aspect of the present invention is the rotating electrical machine according to any one of the first to third aspects, wherein the coil winding portion is recessed in the stator core.
In the present invention, the coil winding portion is recessed in the stator core. Therefore, no deviation occurs when the coil is assembled, so that the coil can be easily assembled.

  The gist of a fifth aspect of the present invention is the rotating electrical machine according to the fourth aspect, wherein coil winding portions at both circumferential ends of the stator core are inclined corresponding to the inclination of the coil. .

  In this invention, since the coil winding part in the circumferential direction both ends of the stator core is inclined corresponding to the inclination of the coil, the coil can be easily wound obliquely.

  Therefore, according to the above-described invention, the stator and the rotor are opposed to each other in the radial direction and the axial direction so that the rotating magnetic field generated in the coil is effectively applied to increase the torque, but the coil is easily assembled. be able to.

(First embodiment)
A first embodiment of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, in a motor 10 as a rotating electrical machine of the present embodiment, a disc-shaped end frame 12 covering the opening is fixed to a lower end of a bottomed cylindrical housing 11 that opens downward. . Bearings 13 are fixed to the center of the housing 11 and the center of the upper base of the end frame 12, and a rotating shaft 14 is rotatably supported by the bearings 13.

  Inside the housing 11, an annular stator 15 centering on the axis L of the rotating shaft 14 is supported and fixed to the housing 11 by an annular fixing portion 15 a formed on the outer peripheral side at the corner portion 11 a. Yes. On the inner peripheral side of the stator 15, a bottomed cylindrical first yoke 21 in which the center of the bottom 21 a is fixed to the rotating shaft 14 is disposed. The side portion 21b of the first yoke 21 extends along the direction of the axis L, and the upper end thereof is bent at a right angle to form a flange portion 21c. A first magnet 22 having an L-shaped annular shape is fixed to a surface of the side portion 21b and the flange portion 21c of the first yoke 21 facing the stator 15.

  On the other hand, a bottomed cylindrical second yoke 23 in which the center of the bottom 23 a is fixed to the rotating shaft 14 is disposed below the stator 15. The side portion 23b of the second yoke 23 extends in the direction of the axis L on the outer peripheral side of the stator 15, and the bottom 23a and the side portion 23b of the second portion having a ring shape with an L-shaped cross section on the surface facing the stator 15. A magnet 24 is fixed.

  The first and second magnets 22 and 24 are magnetized so that N poles and S poles are alternately magnetized in the circumferential direction, and the number of poles thereof is 12 poles. The first magnet 22 and the second magnet 24 are provided so that their poles are opposite to each other at the same position in the circumferential direction. The first and second magnets 22 and 24 are formed by injection molding, and are formed so that the magnetic force of the second magnet 24 is stronger than the magnetic force of the first magnet 22. The rotating shaft 14, the first yoke 21, the first magnet 22, the second yoke 23, and the second magnet 24 as described above constitute a rotor.

  As shown in FIGS. 2 and 3, the stator 15 has nine stator cores 31 formed by compressing and sintering magnetic powder at equal intervals in the circumferential direction. 2 and 3 partially show 1/3 of the stator 15 in the circumferential direction. Each stator core 31 is wound with a coil 32 corresponding to each of the U, V, and W phases, and the stator core 31 around which the coil 32 is wound is molded with a molding material 33 made of a resin material. Thus, the stator 15 is formed in an annular shape (see FIG. 2). The fixed portion 15a of the stator 15 is made of a molding material 33 and is formed when the stator 15 is molded.

  A first opposing portion 41 having a substantially fan shape in plan view is formed on the inner peripheral portion of the stator core 31 so as to extend in the direction of the axis L. An intermediate portion 42 is formed at the lower central portion of the first opposing portion 41 in the circumferential direction so as to incline slightly downward toward the outer peripheral side, and a second opposing portion extends downward on the outer peripheral side of the intermediate portion 42. A portion 43 is formed. The first and second opposing portions 41 and 43 are formed to have the same length in the axis L direction.

  The first opposing portion 41, the intermediate portion 42, and the second opposing portion 43 form a substantially crank-shaped cross section at the center in the circumferential direction of the stator core 31 (see FIGS. 1 and 2). The first and second facing portions 41 and 43 are respectively formed with inclined portions 41a and 43a that are inclined downward toward the inside at both circumferential positions of the intermediate portion 42. By the inclined portions 41a and 43a, both the lower end sides of the first facing portion 41 and the upper end sides of the second facing portion 43 are formed in a tapered shape (see FIG. 2). In addition, the lower end of the inclined portion 41 a of the first facing portion 41 is provided with a notch portion 41 b formed so that both circumferential corner portions of the first facing portion 41 have a tapered shape, and the coil 32 is wound. It is easy to turn.

  Around the intermediate portion 42 of the stator core 31, the coil 32 is wound around a coil winding portion configured to be a recess by the first and second facing portions 41, 43 and the intermediate portion 42. That is, the coil 32 is wound obliquely from the upper part of the second opposing part 43 to the lower part of the first opposing part 41 so as to pass between the inclined parts 41a and 43a of the first and second opposing parts 41 and 43. . Since the coil 32 is wound in this way, the winding center line CL of the coil 32 is inclined with respect to the axis L of the rotating shaft 14 and intersects the axis L as shown in FIG.

  In such a stator core 31, the inner peripheral surface and upper end surface of the first opposing portion 41 and the outer peripheral surface and lower end surface of the second opposing portion 43 are formed so as to be exposed from the molding material 33. The first facing portion 41 has an inner peripheral surface facing the first magnet 22 in the radial direction, and an upper end surface facing the first magnet 22 in the axis L direction. On the other hand, the outer peripheral surface of the second facing portion 43 faces the second magnet 24 in the radial direction, and the lower end surface faces the second magnet 24 in the axis L direction.

  In the motor 10 having such a configuration, when a drive current having a phase corresponding to each of the U, V, and W phases is supplied to each coil 32 of the stator 15, a rotating magnetic field is generated in the coil 32. FIG. 4 shows a magnetic flux passage (magnetic circuit) in the sectional view of the stator 15 and the rotor of FIG. In FIG. 4, for convenience of explanation, a section of adjacent stator cores 31 is developed and the housing 11, the end frame 12, and the rotating shaft 14 are omitted.

  As shown in FIG. 4, in the stator core 31, magnetic flux passes obliquely from the first facing portion 41 to the second facing portion 43 or from the second facing portion 43 to the first facing portion 41. In particular, in the intermediate part 42, the magnetic flux passes substantially parallel to the winding center line CL. By forming such a magnetic circuit, the rotating magnetic field generated by the coil 32 acts on the first and second magnets 22 and 24 in the radial direction and the axis L direction, respectively, and the rotor rotates. . In such a motor 10, since the coil 32 is inclined, the rotating magnetic field generated in the coil 32 effectively acts not only in the radial direction but also in the axis L direction, and the rotational torque is efficiently improved. It is supposed to be.

Next, characteristic effects of the present embodiment will be described.
(1) The stator core 31 includes a coil winding portion in which the coil 32 is wound so that the winding center line CL of the coil 32 is inclined with respect to the axis L of the rotating shaft 14, and the inner peripheral side and outer periphery of the stator core 31. First and second facing portions 41 and 43 provided on the side are formed. The stator core 31 is opposed to the first and second magnets 22 and 24 fixed to the first and second yokes 21 and 23 of the rotor, respectively, in the radial direction and the axis L direction on the inner peripheral side and the outer peripheral side. is doing. Thereby, the magnetic flux generated in the coil 32 effectively acts on the first and second magnets 22 and 24 not only in the radial direction but also in the axis L direction via the first and second opposing portions 41 and 43. Rotational torque can be improved. At the same time, it is not necessary to wind the coil 32 so that the coil end portion bends in a direction orthogonal to the rotation shaft 14 as in the prior art, so that the coil 32 can be easily assembled.

  (2) Since the coil winding portion is recessed by the first and second facing portions 41, 43 and the intermediate portion 42, no deviation occurs during coil assembly, and the coil 32 can be easily assembled. .

  (3) A plurality of stator cores 31 are arranged in the circumferential direction, and since they are configured separately from each other, the coils 32 can be individually assembled for each stator core 31, and the assembly is easier. Become.

  (4) The stator 15 is integrally formed by molding a plurality of stator cores 31 with a molding material 33 made of a resin material, and a fixing portion 15 a for fixing the stator 15 to the housing 11 is formed by the molding material 33. Is done. Therefore, the fixing portion 15a can be easily formed.

(5) Since the coil winding portion is inclined corresponding to the inclination of the coil 32 at both circumferential ends of the stator core 31, the coil 32 can be easily wound obliquely.
(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

  The motor 50 according to the present embodiment is different from the motor 10 according to the first embodiment in that the rotor (rotating shaft) is divided into two to obtain a biaxial output. Accordingly, the following description will be focused on the rotor, and the same components as those in the first embodiment will be denoted by the same reference numerals, and detailed description thereof will be omitted.

  As shown in FIG. 5, a bottomed cylindrical holding recess 51a that opens downward is formed at the lower end of the first rotating shaft 51 that is pivotally supported by the bearing 13 on the housing 11 side, and the holding recess 51a. An intermediate bearing 52 is fixed to the main body. A second rotary shaft 53 provided coaxially with the first rotary shaft 51 is pivotally supported on the intermediate bearing 52 and the bearing 13 on the end frame 12 side. That is, the first and second rotating shafts 51 and 53 are provided to be individually rotatable.

  The first yoke 21 is fixed to the first rotating shaft 51, and the second yoke 23 is fixed to the second rotating shaft 53. And the 1st and 2nd yokes 21 and 23 are respectively fixed to the first and second magnets 54 and 55 having an L-shaped cross section. The first rotary shaft 51, the first yoke 21 and the first magnet 54 constitute the inner rotor R1 shown in the schematic diagram of FIG. 6, and the second rotary shaft 53, the second yoke 23 and the second magnet 55 are the outer rotor R2. Is configured. A stator 60 having substantially the same configuration as that of the first embodiment is disposed between the first and second magnets 54 and 55 (see FIG. 5). As shown in FIG. 6, the first magnet 54 is formed with 6 poles and the second magnet 55 is formed with 12 poles, and a stator core 31 and a coil 32 having substantially the same configuration as that of the first embodiment are provided on the stator 60 in the circumferential direction. Eighteen are provided at equal intervals.

  Next, the rotational drive of the motor 50 of this embodiment is demonstrated according to FIGS. 6 to 8, for convenience of explanation, the stator core 31 is divided into six pieces every 120 ° in the circumferential direction, and numbers 1 to 6 (blocks 1 to 6) are given to the respective stator cores. 7A and 7B, the polarities (N and S poles) of the inner rotor R1, the outer rotor R2 and the stator 60 are only partially shown (for 120 °), and the polarities of the other parts are shown. Is omitted.

  First, when only the outer rotor R2 is rotated, as shown in FIG. 7A, the stator cores 31 of the blocks 1, 4, blocks 2, 5, and blocks 3, 6 correspond to the U, V, and W phases, respectively. A drive current (outer rotor drive current) is supplied. When only such an outer rotor driving current is supplied, the outer rotor R <b> 2 rotates with a rotating magnetic field generated in the stator 60. On the other hand, a magnetic balance is maintained between the inner rotor R1 and the rotating magnetic field generated in the stator 60, so that the inner rotor R1 does not rotate.

  When only the inner rotor R1 is rotated, as shown in FIG. 7 (b), the drive currents corresponding to the U, V, and W phases in the stator cores 31 of the blocks 1, 2, 3, 4, 4, and 6, respectively. (Inner rotor drive current) is supplied. The frequency of the inner rotor driving current is set to ½ of the frequency of the outer rotor driving current. When only such an inner rotor driving current is supplied, the inner rotor R <b> 1 rotates with a rotating magnetic field generated in the stator 60. On the other hand, a magnetic balance is maintained between the outer rotor R2 and the rotating magnetic field generated in the stator 60, so that the outer rotor R2 does not rotate.

  As shown in FIG. 8, when a combined drive current obtained by combining the outer rotor drive current and the inner rotor drive current as described above is supplied to the stator 60, the outer rotor R2 and the inner rotor R1 are rotationally driven simultaneously. It is like that.

  The motor 50 of the present embodiment has the effects described in the first embodiment, although there are some changes compared to the motor 10 of the first embodiment. In addition, in the motor 50 of the present embodiment, individual outputs can be obtained from the first rotating shaft 51 of the inner rotor R1 and the second rotating shaft 53 of the outer rotor R2.

In addition, you may change embodiment of this invention as follows.
In the first embodiment, nine stator cores 31 are provided which are magnetized so that the number of poles of the first and second magnets 22 and 24 is 12 and the coils 32 are wound. However, the present invention is not limited to this, and the first and second magnets 22 and 24 may have other pole numbers, and the stator core 31 may be provided with fewer or more than nine. In the second embodiment, the first and second magnets 54 and 55 are magnetized to 6 poles and 12 poles, respectively, and 18 stator cores 31 are provided. However, the first and second magnets 54 and 55 are provided. Other numbers of poles may be used, and fewer or more stator cores 31 may be provided.

-The axial support structure of the 1st and 2nd rotating shafts 51 and 53 in the said 2nd Embodiment is not limited to the structure of this embodiment, It is good also as another form.
In each of the above embodiments, the first and second magnets 22 and 24 formed by injection molding are used. However, for example, a sintered magnet may be used.

  In each of the above-described embodiments, the first magnets 22 and 54 and the second magnets 24 and 55 are integrally formed in an L-shaped cross section. Different magnets may be used.

  In each of the above embodiments, the stator core 31 formed by compressing and sintering magnetic powder is used. However, for example, a stator core formed by laminating a plurality of electromagnetic steel plates by press working may be used.

  In each of the above embodiments, the shape of the stator core 31 including the first and second facing portions 41 and 43 and the coil winding portion around which the coil 32 is wound obliquely is not limited to this embodiment. There may be other shapes.

The motor internal configuration (rotor and stator) in each of the above embodiments may be configured upside down.
In each of the above embodiments, the brushless motor has been described as an example. However, for example, a motor with a brush may be used.

Sectional drawing which shows the motor in 1st Embodiment. The perspective view which shows a stator partially. The top view which shows a stator core partially. The schematic diagram which shows the magnetic circuit of a motor. Sectional drawing which shows the motor in 2nd Embodiment. The schematic diagram which shows the stator and rotor in 2nd Embodiment. (A) (b) The schematic diagram for demonstrating the drive control of the motor in 2nd Embodiment. Explanatory drawing for demonstrating the drive current in 2nd Embodiment.

Explanation of symbols

  L ... axis of rotating shaft, CL ... winding center line, 10, 50 ... motor as rotating electric machine, 11 ... housing, 14 ... rotating shaft, 15, 60 ... stator, 15a ... fixed portion, 21 ... rotor. 1st yoke, 22, 54 ... 1st magnet, 23 ... 2nd yoke which comprises rotor, 24, 55 ... 2nd magnet, 31 ... stator core, 32 ... coil, 33 ... molding material which consists of resin material, 41 ... 1st DESCRIPTION OF SYMBOLS 1 opposing part, 42 ... Intermediate | middle part which comprises a coil winding part, 43 ... 2nd opposing part, 51 ... 1st rotating shaft, 53 ... 2nd rotating shaft.

Claims (5)

A stator having an annular shape formed by a stator core around which a coil is wound, and a rotor having a rotating shaft disposed on the inner peripheral side of the stator, and the rotor rotates by the action of a rotating magnetic field generated in the coil Configured and possible
The rotor is provided with first and second magnets provided on the inner peripheral side and the outer peripheral side of the stator so as to face the stator in a radial direction and an axial direction so as to be integrally rotatable with the rotary shaft,
The stator core of the stator is provided on the inner peripheral side and the outer peripheral side thereof, respectively, and first and second opposing portions facing the first and second magnets in the radial direction and the axial direction, and the first and second. A rotating electrical machine comprising: a coil winding portion provided between opposing portions, wherein a coil winding portion is formed such that a winding center line of the coil is inclined with respect to an axis of the rotation shaft. In the rotating electrical machine according to claim 1,
A plurality of stator cores are arranged in the circumferential direction, and the coil is assembled to each of the stator cores. In the rotating electrical machine according to claim 1 or 2,
The rotating electric machine according to claim 1, wherein the stator core and the coil are molded of a resin material, and a fixing portion for fixing the stator to the housing is formed of the resin material. The rotating electrical machine according to any one of claims 1 to 3,
The rotating electrical machine characterized in that the coil winding portion is recessed in the stator core. In the rotating electrical machine according to claim 4,
The rotating electrical machine characterized in that coil winding portions at both circumferential ends of the stator core are inclined corresponding to the inclination of the coil.

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