JP2018082600A - Double-rotor dynamoelectric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain reduction in torque due to a coupling hole provided in the stator, in a double-rotor dynamoelectric machine.SOLUTION: A double-rotor dynamoelectric machine 10 includes as a stator 20, a stator core 22 having a center yoke 24, outer peripheral side teeth 26, and inner peripheral side teeth 28, an outer peripheral side coil 42 and an inner peripheral side coil 44. Furthermore, an outer rotor 50 and an inner rotor 60 are arranged, respectively, on the outer peripheral side and inner peripheral side of the stator 20. Fixing means 68 for fixing the stator 20 to an external attachment part by engaging with a fastening hole 70 is also provided. The outer peripheral side coil 42 and the inner peripheral side coil 44 are in-phase, and the insertion direction of the winding into an outer peripheral side slot 30 and the inner peripheral side slot 32 are same. The fastening hole 70 is provided on the outside of the width region in the center yoke 24, when the width of the outer peripheral side teeth 26, and the width of the inner peripheral side teeth 28 are extended.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a double rotor type rotating electrical machine, and more particularly to a stator structure thereof.

  2. Description of the Related Art A double rotor type rotating electrical machine in which a conventional rotor is concentrically disposed on an outer peripheral side and an inner peripheral side of a stator is known. For example, Patent Literature 1 discloses a rotating electrical machine including a stator, an inner rotor, and an outer rotor that are independently driven by winding independent exciting coils around the radially inner and outer teeth of the stator core. It is disclosed.

  Patent Document 2 discloses a configuration in which a stator is disposed as a rotating electrical machine between an outer rotor and an inner rotor that are disposed coaxially. The stator is divided into a plurality of stator pieces, and each stator piece has one core around which one coil is wound, and an outer rotor side yoke and an inner rotor side yoke project from one core.

  Here, the holes for passing the fastening bolts for arranging and integrating the plurality of stator pieces in an annular shape are provided in the inner rotor side yoke divided into semicircles on the joint surfaces of the adjacent stator pieces. . The joint surface on which the hole is disposed is not located on the extension of the central axis of each core, but is disposed at an intermediate position between two adjacent cores.

  Patent Document 3 relates to an invention in which the three-phase winding of the stator is arranged with less interference. As one of the application examples, a composite motor in which motors are arranged on the outer peripheral side and the inner peripheral side is disclosed. Has been. The composite motor includes an outer rotor, an inner rotor, and a stator having an outer slot and an inner slot. In the stator, a three-phase coil is wound by toroidal winding, and the direction of the winding inserted into the outer peripheral side slot and the direction of the winding inserted into the inner peripheral side slot are opposite to each other.

JP-A-2006-119780 JP 2003-299329 A JP 2010-124577 A

  In a double rotor type rotating electrical machine in which a rotor is disposed on each of an outer peripheral side and an inner peripheral side of a stator, means for fixing the stator to an external mounting portion or the like is required. When a hole for passing a fastening bolt is formed in the stator, depending on the arrangement position, the hole becomes a magnetic resistance against the magnetic flux flowing through the stator, and the torque that can be output by the rotating electrical machine is reduced. Therefore, there is a demand for a double rotor type rotating electrical machine that can suppress a decrease in torque due to a fastening hole provided in the stator.

  A double rotor type rotating electrical machine according to the present disclosure includes an annular center yoke, outer peripheral teeth and inner peripheral teeth protruding from the center yoke to the outer peripheral side and the inner peripheral side, respectively, and the outer peripheral teeth. A stator having an outer peripheral side coil and an inner peripheral side coil wound around an inner peripheral side tooth, an outer rotor disposed at a predetermined interval on the outer peripheral side of the stator, and a predetermined on the inner peripheral side of the stator Engage with the fastening holes provided between the inner rotors spaced apart and the outer peripheral slots between the adjacent outer peripheral teeth and the inner peripheral slots between the adjacent inner peripheral teeth. Fixing means for fixing the stator to the external mounting portion, and the outer peripheral coil and the inner peripheral coil arranged as a pair across the center yoke are in-phase coils, The direction of the applied drive current is set so that the magnetic flux in the same direction flows through the corresponding outer peripheral side teeth and inner peripheral side teeth, and the fastening holes are respectively the widths of the outer peripheral side teeth and the inner peripheral side teeth. Is provided outside the width region of the center yoke when the is extended.

  According to the above configuration, the fastening holes for disposing the fixing means for fixing the stator to the external mounting portion remove the region where the widths of the outer peripheral side teeth and the inner peripheral side teeth around which the coils are wound are extended. Provided in the center yoke. Accordingly, it is possible to suppress a decrease in torque due to a fastening hole provided in the stator without hindering the flow of magnetic flux in the outer peripheral side teeth and the inner peripheral side teeth.

  According to the double rotor type rotating electrical machine having the above-described configuration, torque reduction due to a fastening hole provided in the stator is suppressed.

It is a block diagram of the double rotor type rotary electric machine which concerns on embodiment. It is a figure which shows the effect of the double rotor type rotary electric machine which concerns on embodiment using the enlarged view about the stator of the part of the magnetic pole P1 of FIG. It is a figure similar to FIG. 2, and is a figure which shows a comparative example. It is a figure similar to FIG. 2, and is a figure which shows another comparative example.

  Hereinafter, embodiments will be described in detail with reference to the drawings. In the following, distributed winding is described as a winding method of the stator coil. However, magnetic flux generated by the stator coil is an example of flowing through the teeth, and concentrated winding may be used in some cases. The shape, dimensions, the number of teeth and slots, the number of magnetic poles of the rotor, and the like described below are examples for explanation, and can be appropriately changed according to the specifications of the rotating electrical machine. Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted.

  FIG. 1 is a diagram showing a configuration of a double rotor type rotating electrical machine 10. Hereinafter, unless otherwise specified, the double rotor type rotating electrical machine 10 is referred to as the rotating electrical machine 10. The rotating electrical machine 10 includes a stator 20 that is a stator, an outer rotor 50 that is disposed on the outer peripheral side of the stator 20 with a predetermined interval, and an inner that is disposed on the inner peripheral side of the stator 20 with a predetermined interval. And the rotor 60. The outer rotor 50 and the inner rotor 60 are rotors. The rotating electrical machine 10 is a three-phase synchronous rotating electrical machine that is driven by control of a drive circuit (not shown) and that rotates the outer rotor 50 and the inner rotor 60 together with the stator 20 interposed therebetween.

  The stator 20 is an annular magnetic part, and includes a stator core 22 and a stator coil 40. FIG. 1 shows the radial direction, the circumferential direction, and the axial direction. The radial direction is a radial direction connecting the center position C of the stator 20 and the outer peripheral side of the stator 20, the central position C side is the inner peripheral direction, and the outer peripheral side of the stator 20 is the outer peripheral direction. The circumferential direction is a direction along the circumferential direction around the center position C. The axial direction is a direction in which the rotor shaft attached to the center hole 66 of the inner rotor 60 provided at the center position C extends, and is a direction perpendicular to the paper surface in FIG.

  The stator core 22 has an annular center yoke 24, and an outer peripheral side tooth 26 and an inner peripheral side tooth 28 that protrude from the center yoke 24 to the outer peripheral side and the inner peripheral side, respectively. A space between adjacent outer peripheral teeth 26 is an outer peripheral slot 30, and a space between adjacent inner peripheral teeth 28 is an inner peripheral slot 32.

  The outer peripheral side teeth 26 and the inner peripheral side teeth 28 are arranged as a pair with the center yoke 24 interposed therebetween. Similarly, the outer peripheral side slots 30 and the inner peripheral side slots 32 are arranged as a pair with the center yoke 24 interposed therebetween. The phrase “arranged as a pair across the center yoke 24” means that the center yoke 24 is disposed as a pair on the same radial direction passing through the center position C. The number of the outer peripheral side teeth 26, the number of the outer peripheral side slots 30, the number of the inner peripheral side teeth 28, and the number of the inner peripheral side slots 32 are the same number, 24, which is a multiple of three.

  The stator core 22 integrally includes a center yoke 24, an outer peripheral side tooth 26, and an inner peripheral side tooth 28, and is formed in a predetermined shape in which an outer peripheral side slot 30 and an inner peripheral side slot 32 are formed. It is a laminated body in which body thin plates are stacked in the axial direction in a predetermined number. Both surfaces of the magnetic thin plate are electrically insulated. As a material of the magnetic thin plate, an electromagnetic steel plate which is a kind of silicon steel plate can be used. Instead of the laminated body of magnetic thin plates, the stator core 22 may be formed by integrally molding magnetic powder.

  The stator coil 40 is inserted into the outer peripheral side slot 30 and wound around the outer peripheral side tooth 26, and the inner peripheral side inserted into the inner peripheral side slot 32 and wound around the inner peripheral side tooth 28. And a coil 44.

  Both the outer peripheral coil 42 and the inner peripheral coil 44 are three-phase distributed winding coils. The outer peripheral coil 42 is formed by winding one phase winding across a plurality of outer teeth 26, and the inner coil 44 has one phase winding straddling a plurality of inner teeth 28. It is formed by winding.

  Since the outer peripheral side teeth 26 and the inner peripheral side teeth 28, and the outer peripheral side slots 30 and the inner peripheral side slots 32 are arranged as a pair with the center yoke 24 interposed therebetween, the outer peripheral side coil 42 and the inner peripheral side coil 44 are also arranged in the center yoke. 24 are arranged as a pair.

  FIG. 1 shows a part of the winding of the stator coil 40. U, V, W attached to the pair of the outer peripheral side slot 30 and the inner peripheral side slot 32 indicate phases of windings inserted into the outer peripheral side slot 30 and the inner peripheral side slot 32. In this way, windings of the same phase are inserted into the outer peripheral side slot 30 and the inner peripheral side slot 32 that form a pair with the center yoke 24 interposed therebetween.

  Taking the U-phase winding of the outer peripheral coil 42 as an example, it is inserted into the outer peripheral slot 30 labeled U, and extends along the circumferential direction from the inserted outer peripheral slot 30 and separated by three slots. It is inserted into the outer peripheral side slot 30 labeled U and formed repeatedly. Similarly, the U-phase winding of the inner peripheral coil 44 paired with the outer peripheral coil 42 was inserted into the inner peripheral slot 32 labeled U, and then extended along the circumferential direction and separated by three slots. It is inserted into the inner peripheral side slot 32 marked with the next U, and this is repeated. The direction of insertion is the same for the outer peripheral side coil 42 and the inner peripheral side coil 44 that form a pair. In FIG. 1, as the insertion direction, the direction of insertion from the far side of the paper to the near side is indicated by a black circle in the circle, and the direction of insertion from the near side of the paper to the far side is indicated by a round mark. This is indicated by a mark with an X mark in it. The V-phase winding and the W-phase winding are formed by the same winding method.

  The outer peripheral coil 42 and the inner peripheral coil 44 that form a pair with the center yoke 24 in between are in-phase coils, and the direction in which the winding is inserted into the outer peripheral slot 30 and the inner peripheral slot 32 is also the same direction. is there. With this winding setting for the winding, magnetic flux in the same direction flows through the pair of outer peripheral side teeth 26 and inner peripheral side teeth 28. Details thereof will be described later with reference to FIG.

  The outer rotor 50 is an annular outer rotor disposed concentrically with a predetermined magnetic gap 34 on the outer periphery of the stator 20. The outer rotor 50 has an outer rotor core 52 and a magnetic pole 54. The magnetic pole 54 is an N pole or S pole along the circumferential direction. S, N, S... Are alternately arranged.

  The inner rotor 60 is an annular inner peripheral rotor arranged concentrically with a predetermined magnetic gap 36 on the inner peripheral side of the stator 20. The magnetic gap 36 may be the same gap interval as the magnetic gap 34 of the outer rotor 50 or may be a different gap interval. The inner rotor 60 has an inner rotor core 62, a magnetic pole 64, and a center hole 66. A rotor shaft that is an output shaft of the rotating electrical machine 10 is attached and fixed to the center hole 66. The center position C of the center hole 66 is also the center position C of the stator 20. The magnetic poles 64 are N poles or S poles, and are arranged alternately with N, S, N, S... Along the circumferential direction.

  The outer rotor 50 and the inner rotor 60 both have eight magnetic poles, and the magnetic pole 54 of the outer rotor 50 and the magnetic pole 64 of the inner rotor 60 are arranged in pairs with respect to the center position C. The phase difference regarding the arrangement in the circumferential direction with respect to 64 is zero. Since the number of magnetic poles is 8, the expected angle φ along the circumferential direction of one magnetic pole as viewed from the center position C is 45 degrees. In FIG. 1, P1 to P8 are assigned to the eight magnetic poles, respectively. Each of the magnetic poles P1 to P8 has the same configuration except for the arrangement position and polarity.

  The magnetic poles 54 and 64 may be formed using permanent magnets, reluctance anisotropy due to salient poles or slits, or an embedded magnet type combining these.

  In the above description, the number of magnetic poles of the outer rotor 50 and the inner rotor 60 is set to 8, and the number of the outer peripheral side slots 30 and the inner peripheral side slots 32 in the stator 20 is set to 24. Changes can be made as appropriate according to the ten specifications.

  Here, a fixing method for fixing the stator 20 to an external mounting portion will be described. The stator 20 includes an outer rotor 50 on the outer peripheral side and an inner rotor 60 on the inner peripheral side. Since the outer rotor 50 and the inner rotor 60 are rotating bodies, it is difficult to attach the stator core as it is to the motor case as in a general rotating electric machine. Therefore, a fastening hole 70 is provided in the center yoke 24 of the stator 20. The fastening hole 70 is a hole that penetrates the center yoke 24 in the axial direction. From one side of the fastening hole 70, a fastening bolt as a fixing means 68 is inserted, the threaded portion is projected on the other side, and the projecting male threaded portion is screwed into the threaded portion so as to be provided in the external mounting portion. Engage with. In FIG. 1, the fixing means 68 arranged in some of the fastening holes 70 are illustrated. As a result, the stator 20 is fixed to the external mounting portion. As a method of engaging the fixing means 68 with the fastening hole 70, a press-fit shaft or the like may be used instead of the screw mechanism. In FIG. 1, the number of fastening holes 70 is the same as the number of the outer peripheral side slots 30 and the inner peripheral side slots 32, but the number can be smaller than that within a range where the fixing can be sufficiently performed.

  The fastening hole 70 is provided between the outer peripheral slot 30 and the inner peripheral slot 32 that form a pair with the center yoke 24 interposed therebetween. The fastening hole 70 is arranged at a position where the magnetic resistance generated when the drive current flows through the distributed windings does not become a magnetic resistance when flowing through the stator 20. Specifically, a width region 72 in the center yoke 24 when the width along the circumferential direction of the outer peripheral side tooth 26 and the width along the circumferential direction of the inner peripheral side tooth 28 are extended in the radial direction (FIG. 2). Provided outside the reference). Details thereof will be described later.

  The operational effects of the above-described configuration, particularly the operational effects of the arrangement of the fastening holes 70 will be described in detail with reference to FIGS. 2 to 4 including comparison with two comparative examples.

  FIG. 2 is an enlarged view of the stator 20 in the portion of the magnetic pole P1. As shown in FIG. 2, the length along the radial direction of the outer peripheral side teeth 26 is shorter than the length along the radial direction of the inner peripheral side teeth 28. This is because, in the stator coil 40, the number of turns on the outer peripheral side teeth 26 of the outer peripheral side coil 42 and the number of turns on the inner peripheral side teeth 28 of the inner peripheral side coil 44 are the same. This is because the space of the inner slot 32 and the space of the inner slot 32 are the same.

  The fastening hole 70 is provided between the outer peripheral slot 30 and the inner peripheral slot 32 that are paired with the center yoke 24 interposed therebetween. In other words, the fastening hole 70 is formed outside the width region 72 in the center yoke 24 when the width along the circumferential direction of the outer peripheral side tooth 26 and the width along the circumferential direction of the inner peripheral side tooth 28 are extended. Is provided. This includes not only the arrangement position of the fastening hole 70 but also that the outer diameter of the fastening hole 70 does not enter the width region 72.

  In FIG. 2, magnetic fluxes 80 and 82 generated in the stator 20 by passing a drive current through the stator coil 40 are shown. The magnetic fluxes 80 and 82 flow so that magnetic fluxes in the same direction continue to the outer peripheral side teeth 26 and the inner peripheral side teeth 28. This is because the winding inserted in the outer peripheral side slot 30 and the winding inserted in the inner peripheral side slot 32 have the same phase and the same insertion direction. Since the magnetic fluxes 80 and 82 do not hang around the fastening hole 70, the fastening hole 70 does not become a magnetic resistance with respect to the magnetic fluxes 80 and 82. Thereby, it is possible to suppress the torque that can be output from the rotating electrical machine 10 from being reduced by the magnetic resistance caused by the fastening hole 70.

  In the comparative example of FIG. 3, the difference from FIG. 2 is that a fastening hole 71 is arranged in a region connecting the outer peripheral side tooth 26 and the inner peripheral side tooth 28 in the center yoke 24. In this case, the magnetic fluxes 81 and 83 flowing in the outer peripheral side teeth 26 and the inner peripheral side teeth 28 are hindered by the magnetic resistance of the fastening holes 71. For this reason, the torque that the rotating electrical machine 10 can output is reduced by the magnetic resistance caused by the fastening hole 71.

  In the comparative example of FIG. 4, unlike FIG. 2, the winding method of the stator coil is not distributed winding but toroidal winding wound around the center yoke 24. In the case of toroidal winding, the winding inserted in the outer circumferential slot 30 and the winding inserted in the inner circumferential slot 32 have the same phase, but the insertion directions are opposite to each other. As shown in FIG. 4, the magnetic fluxes 84, 86, 88 generated by the toroidal winding flow through the center yoke 24. The fastening holes 70 are provided between the outer peripheral side slot 30 and the inner peripheral side slot 32 that are paired with the center yoke 24 sandwiched in the same arrangement as in FIG. Therefore, the flow of the magnetic fluxes 84, 86, and 88 generated by the toroidal winding is hindered by the magnetic resistance of the fastening hole 70. For this reason, the torque that the rotating electrical machine 10 can output is reduced by the magnetic resistance caused by the fastening hole 70.

  Unlike the comparative example of FIGS. 3 and 4, according to the rotating electrical machine 10 having the configuration of FIG. 1, the fastening hole 70 does not become a magnetic resistance with respect to the magnetic fluxes 80 and 82 as shown in FIG. 2.

  The double rotor type rotating electrical machine 10 according to the present embodiment includes a stator 20. The stator 20 includes an annular center yoke 24 and a stator core 22 having an outer peripheral side tooth 26 and an inner peripheral side tooth 28 that protrude from the center yoke 24 to the outer peripheral side and the inner peripheral side, respectively. The stator 20 includes an outer coil 42 wound around the outer teeth 26 and an inner coil 44 wound around the inner teeth 28. The rotating electrical machine 10 further includes an outer rotor 50 disposed on the outer peripheral side of the stator 20 with a predetermined interval, and an inner rotor 60 disposed on the inner peripheral side of the stator 20 with a predetermined interval. The rotating electrical machine 10 is further engaged with a fastening hole 70 provided between an outer peripheral slot 30 between adjacent outer peripheral teeth 26 and an inner peripheral slot 32 between adjacent inner peripheral teeth 28. In addition, a fixing means 68 for fixing the stator 20 to the external mounting portion is provided. Here, the outer peripheral coil 42 and the inner peripheral coil 44 disposed as a pair with the center yoke 24 interposed therebetween are in-phase coils, and the direction of the drive current applied to each of the coils is the same as that of the corresponding outer peripheral teeth 26. It is set so that the magnetic flux in the same direction flows through the inner peripheral side teeth 28. The fastening hole 70 is provided outside the width region 72 in the center yoke 24 when the width of the outer peripheral tooth 26 and the width of the inner peripheral tooth 28 are extended.

  According to the above configuration, the fastening hole 70 with which the fixing means 68 for fixing the stator 20 to the external mounting portion is engaged has the width region 72 obtained by extending the widths of the outer peripheral side teeth 26 and the inner peripheral side teeth 28. The center yoke 24 is removed. Accordingly, the flow of the magnetic fluxes 80 and 82 in the outer peripheral teeth 26 and the inner peripheral teeth 28 is not hindered. As a result, a reduction in torque due to the fastening hole 70 provided in the stator 20 can be suppressed, and the rotating electrical machine can be reduced in size.

  10 (double rotor type) rotating electrical machine, 20 stator, 22 stator core, 24 center yoke, 26 outer peripheral side teeth, 28 inner peripheral side teeth, 30 outer peripheral side slots, 32 inner peripheral side slots, 34, 36 magnetic gap, 40 stator Coil, 42 Outer coil, 44 Inner coil, 50 Outer rotor, 52 Outer rotor core, 54, 64 Magnetic pole, 60 Inner rotor, 62 Inner rotor core, 66 Center hole, 68 Fixing means, 70, 71 Fastening hole, 72 Width region, 80, 81, 82, 83, 84, 86, 88 Magnetic flux.

Claims (1)

An annular center yoke, outer peripheral teeth and inner peripheral teeth projecting from the center yoke to the outer peripheral side and the inner peripheral side, respectively, and an outer peripheral coil and the inner peripheral side wound around the outer peripheral teeth A stator having an inner peripheral coil wound around the teeth;
An outer rotor disposed at a predetermined interval on the outer peripheral side of the stator;
An inner rotor disposed at a predetermined interval on the inner circumferential side of the stator;
Engaging the outer peripheral side slot between the adjacent outer peripheral side teeth and the fastening hole provided between the inner peripheral side slots between the adjacent inner peripheral side teeth to attach the stator to the external mounting portion Fixing means for fixing to,
With
The outer peripheral coil and the inner peripheral coil arranged as a pair with the center yoke interposed therebetween are in-phase coils, and the direction of the drive current applied to each of them is the corresponding outer peripheral tooth and the inner peripheral coil. It is set so that magnetic flux in the same direction flows through the side teeth,
The fastening hole is a double rotor type rotating electrical machine provided outside the width region of the center yoke when the width of the outer peripheral teeth and the width of the inner peripheral teeth are extended.

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