JP2015061374A - Stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator that allows enhancing the core occupancy ratio in a teeth region and being adapted to downsizing a coil end.SOLUTION: A stator 18 includes: an adhesive 42 filled in spaces between stacked electromagnetic steel plates 40, that is, spaces between yokes 32, by impregnation and fixing the electromagnetic steel plates 40 to one another; and an insulator 38 attached to outer peripheries of teeth 34 so as to fasten the teeth 34 and retaining a compressional state of the teeth 34 in an axial direction 20. This configuration bonds adjacent yokes 32 to each other and retains the compressional state of the teeth 34 by the insulator 38, resulting in secured integration of the stacked electromagnetic steel plates 40. Additionally, the teeth 34 are compressed in the axial direction 20 and spaces among the teeth 34 are reduced, so that the core occupancy ratio of the teeth 34 increases, thereby being adapted to downsizing of a coil end 28a.

Description

  The present invention relates to a stator, and more particularly to an improvement in the structure of the stator.

  Conventionally, in a rotating electrical machine, a stator having a stator core formed by laminating thin electromagnetic steel sheets is used to reduce iron loss.

  In the following Patent Document 1, by laminating a plurality of electromagnetic steel sheets having an annular yoke and a plurality of teeth protruding radially inward from the yoke, and impregnating an adhesive into a gap between the electromagnetic steel sheets in the lamination direction, It is described that the stator core is configured by fixing the electromagnetic steel plates to each other.

JP 2012-120299 A

  In the technique disclosed in the above patent document, the magnetic steel sheets are fixed to each other by impregnating the gaps between the magnetic steel sheets in the stacking direction with an adhesive. As described above, since the gap is provided between the laminated electromagnetic steel sheets so that the adhesive is impregnated, a stator core having a low core space factor (ratio of the electromagnetic steel sheets in the stator core) is formed. Such a low core occupancy stator core has a relatively large thickness in the stacking direction compared to a high core occupancy. In particular, if the core occupancy ratio in the teeth region remains low, there is a problem that it is not possible to cope with downsizing of the coil end.

  An object of the present invention is to provide a stator that can increase the core occupancy ratio in the tooth region and can cope with the downsizing of the coil end while securely fixing the laminated magnetic steel sheets.

  The present invention relates to a gap between laminated electromagnetic steel sheets in a stator having a stator core formed by laminating an electromagnetic yoke formed with an annular yoke and a plurality of teeth projecting radially inward from the yoke. An adhesive that is filled in the gap between the yokes by impregnation and fixes the magnetic steel sheets together, and an insulator that is attached to the outer periphery of the teeth so as to tighten the teeth and that maintains the compressed state of the teeth in the stacking direction. Features.

  According to the stator of the present invention, it is possible to increase the core occupancy ratio in the tooth region and securely reduce the coil end while securely bonding the laminated magnetic steel sheets.

It is a figure which shows the structure of the rotary electric machine which concerns on this embodiment. It is the top view which expanded a part of stator. It is the exploded sectional view which expanded a part of stator. It is sectional drawing by the AA line of FIG. It is sectional drawing which shows the structure of the insulator of another aspect.

  Hereinafter, embodiments of a stator according to the present invention will be described with reference to the drawings. Before describing a specific stator configuration, the configuration of a rotating electrical machine having a stator will be described with reference to FIG.

  The rotating electrical machine 10 is used as a prime mover of a vehicle, for example. The rotating electrical machine 10 includes a rotor 14 fixed to the rotor shaft 12 and a stator 18 fixed in a case 16 of the rotating electrical machine 10 so as to surround the rotor 14.

  The rotor 14 is a cylindrical magnetic body concentric with the rotor shaft 12, and is configured by stacking, for example, electromagnetic steel plates in the axial direction 20. A magnet insertion hole 22 extending in the axial direction 20 is formed in the electromagnetic steel sheet, and a permanent magnet 24 is inserted and disposed in the magnet insertion hole 22.

  The rotor shaft 12 is rotatably supported by a bearing 26 provided in the case 16. The rotor shaft 12 of the present embodiment is an output shaft that transmits the output of the rotating electrical machine 10 to drive wheels (not shown) of the vehicle. The rotor shaft 12 and the drive wheels are connected via a gear mechanism (not shown). Connected.

  The stator 18 is disposed with a gap around the rotor 14. The stator 18 has a stator coil 28, and a rotating magnetic field is generated in the stator 18 by energization of the stator coil 28. And the force attracted | sucked by this rotating magnetic field generate | occur | produces in the rotor 14 which has the permanent magnet 24, and the rotor 14 rotates.

  Next, the configuration of the stator 18 will be described with reference to FIGS. FIG. 2 is an enlarged plan view of a part of the stator 18 of the present embodiment, FIG. 3 is an exploded perspective view of a part of the stator 18, and FIG. 4 is a line AA in FIG. It is sectional drawing by. In the figure, an arrow θ indicates the circumferential direction, and an arrow R indicates the radial direction.

  The stator 18 has a stator core 30 that is a cylindrical magnetic body concentric with the rotor 14. The stator core 30 is configured by laminating a plurality of electromagnetic steel plates 40 each having an annular yoke 32 and a plurality of teeth 34 protruding inward in the radial direction R from the yoke 32 in the laminating direction, that is, the axial direction 20.

  The teeth 34 are formed so as to protrude from the inner periphery of the yoke 32 toward the inner side in the radial direction R, that is, toward the inner diameter side. A plurality of teeth 34 are provided at predetermined intervals in the circumferential direction θ. A slot 36 that is a groove-like space is formed between adjacent teeth 34 in the circumferential direction θ. The stator coil 28 is wound around the teeth 34 so as to pass through the slot 36. The stator coil 28 attached to the teeth 34 is formed with a coil end 28a (shown in FIG. 1). The coil end 28 a is a coil portion that protrudes from the end portion of the tooth 34 in the axial direction 20 when bridging from one slot 36 to another slot 36.

  The stator 18 of the present embodiment is a gap in the axial direction 20 of the laminated electromagnetic steel sheets 40, and the gap in the yoke 32 region is filled by impregnation with an adhesive 42 to fix the electromagnetic steel sheets 40 to each other. And the stator 18 of this embodiment is attaching the insulator 38 to the outer periphery of the teeth 34 so that the teeth 34 may be clamped, and is maintaining the compression state of the teeth 34 in the axial direction 20. With such a configuration, the electromagnetic steel plates 40 are bonded to each other by the adhesive 42 in the yoke 32 region, and the compressed state of the electromagnetic steel plates 40 stacked by the insulator 38 is maintained in the tooth 34 region. The steel plate 40 is reliably integrated. And since the clearance of the axial direction 20 in the teeth 34 area | region becomes small by mounting | wearing with the insulator 38, the core occupation rate of the teeth 34 area | region can be raised compared with the thing of a prior art. When the core occupancy increases, the length of the stator core 30 in the axial direction 20 becomes smaller than that of the prior art, so that the coil end 28a can be downsized.

  The configuration of the insulator 38 will be specifically described with reference to FIGS. The insulator 38 is made of an insulating resin and is attached to each tooth 34. As shown in FIG. 3, the insulator 38 has a hollow cylindrical shape with both ends opened.

  The insulator 38 is fitted to the teeth 34 in a state where the teeth 34 are compressed in the axial direction 20 by a jig (not shown). As a result, the gap in the axial direction 20 in the tooth 34 region is kept smaller than the gap in the non-compressed state. Further, since the insulator 38 surrounds the teeth 34, the insulation performance between the stator coil 28 and the starter core 30 is ensured.

  FIG. 4 is an enlarged cross-sectional view highlighting a part of the stator core 30, and is a cross-sectional view taken along the line AA of FIG. In the yoke 32 region, as described in the prior art, the electromagnetic steel plates 40 are fixed to each other by impregnating the adhesive 42 in the gaps between the laminated electromagnetic steel plates 40. On the other hand, in the teeth 34 region, the adhesive 42 is not impregnated in the gaps between the laminated electromagnetic steel sheets 40. Instead, as described above, the electromagnetic steel plates 40 are fixed to each other in the teeth 34 region by attaching the insulator 38. Since the insulator 38 maintains the compressed state of the tooth 34 in the axial direction 20, as shown in FIG. 4, the gap in the tooth 34 region can be made smaller than the gap in the yoke 32 region where the adhesive 42 is interposed. it can. As a result, the length of the teeth 34 in the axial direction 20 is smaller than the length of the yoke 32 in the axial direction 20.

  According to the stator 18 of the present embodiment, the gap in the axial direction 20 in the teeth 34 region of the laminated electromagnetic steel sheets 40 can be reduced and the core occupancy can be increased, so the thickness of the stator core 30 in the axial direction 20 can be reduced. As a result, the coil end 28a can be reduced in size. Further, in the stator 18 of the present embodiment, since the adhesive 42 is not used in the tooth 34 region, the adhesive 42 bulges from the gap of the tooth 34 into the slot 36 (for example, the outer peripheral portion of the yoke 32 region in FIG. 4). There is no reference). Therefore, the swelling of the adhesive 42 does not hinder the insertion of the stator coil 28 into the slot 36, so that the mounting workability of the stator coil 28 is improved.

  In the present embodiment, the insulator 38 has been described as being fitted to the tooth 34 in a state where the tooth 34 is compressed in the axial direction 20 by a jig, but the present invention is not limited to this configuration. If the compressed state of the teeth 34 in the stacking direction is maintained after the insulator 38 is mounted, it is not necessary to use a jig before mounting. For example, as shown in FIG. 5, the compression state of the tooth 34 in the axial direction 20 can be realized only by providing an inclined portion 38 a at one inlet of the insulator 38 and fitting the insulator 38 to the tooth 34.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 12 Rotor shaft, 14 Rotor, 16 Case, 18 Stator, 20 Axial direction, 22 Magnet insertion hole, 24 Permanent magnet, 26 Bearing, 28 Stator coil, 30 Stator core, 32 York, 34 Teeth, 36 Slot, 38 Insulator, 40 Electrical steel sheet, 42 Adhesive.

Claims (1)

In a stator having a stator core configured by laminating electromagnetic steel plates formed with an annular yoke and a plurality of teeth protruding radially inward from the yoke,
An adhesive between the electromagnetic steel sheets to be laminated and filled in the gap between the yokes by impregnation, and to fix the electromagnetic steel sheets together;
An insulator which is attached to the outer periphery of the teeth so as to tighten the teeth and holds the compressed state of the teeth in the stacking direction;
A stator comprising:

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