JP2013034350A - Rotary electric machine stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine stator capable of securing torque outputted by a rotary electric machine while suppressing an eddy current which may be generated in a wire coil.SOLUTION: The rotary electric machine stator comprises: an integrated stator core; a wire coil 20 wound around teeth 16 of the stator core with a predetermined number of turns; and a flange member 30 of a magnetic body disposed at further inner circumferential side of an innermost coil of the wire coil 20. A length C along a circumferential direction of the flange member 30 is set shorter than a length along a circumferential direction of the innermost coil (2D+E+F). Here, D denotes a dimension of an inside wiring 22 and an outside wiring 24 along a circumferential direction, E denotes a gap size between the inside wiring 22 and the teeth 16, and F denotes a gap size between the inside wiring 22 and the outside wiring 24.

Description

  The present invention relates to a rotating electrical machine stator, and more particularly, to a rotating electrical machine stator in which a magnetic member is disposed on an inner peripheral surface of a winding coil facing the rotor.

  In the stator of the rotating electrical machine, a winding coil is wound around a protruding portion called a tooth of the stator core. Here, when the leakage magnetic flux that wraps around due to the influence of the rotor magnet is linked to the winding coil, an eddy current flows through the winding coil and a loss occurs.

  For example, in Patent Document 1, as a stator of a motor, in a divided field magnetic pole arranged in an annular shape, a first field coil and a second field coil are wound adjacent to each other in the longitudinal direction of the field core. A rotating configuration is described. Here, the winding width which is a dimension along the longitudinal direction of the field core of the winding of the second field coil on the side facing the rotor is made smaller than the winding width of the first field coil, and the rotor It is disclosed that the loss due to the eddy current due to the leakage magnetic flux that wraps around due to the influence of the magnets is reduced.

  Patent Document 2 discloses a cassette coil having a coil member and a flange member. The flange member is disposed so as to be positioned on the rotor side in the coil side region of the coil member, and the tip end surface covers the inner peripheral surface of the coil member, and faces the rotor and receives magnetic flux from the rotor. Accordingly, it is stated that leakage of magnetic flux received from the rotor to the coil member is reduced, eddy current loss is reduced, and torque ripple and cogging torque are suppressed as compared with the case without a flange member.

JP 2004-153874 A JP 2009-254171 A

  According to Patent Document 2, it is described that the eddy current generated in the winding coil due to the leakage magnetic flux is suppressed by arranging the magnetic member on the inner peripheral surface of the winding coil facing the rotor. . Since this magnetic member is disposed between the rotor and the winding coil, there is a possibility of affecting the output torque of the rotating electrical machine.

  The objective of this invention is providing the rotary electric machine stator which can ensure output torque, suppressing the eddy current which can generate | occur | produce in a winding coil.

  According to the present invention, when a saddle member, which is a magnetic member, is arranged on the inner peripheral surface of the winding coil facing the rotor, eddy current loss and output torque change depending on the size and location of the saddle member. Based on finding. Based on the above knowledge, the following measures are taken to secure output torque while suppressing eddy current loss.

  That is, the rotating electrical machine stator according to the present invention includes an integrated stator core having an annular core body, and a plurality of teeth that protrude from the core body toward the inner peripheral side and are arranged along the circumferential direction. A winding member wound with a predetermined number of turns, and a flange member of a magnetic material disposed further on the inner peripheral side of the innermost coil of the winding coil, the length along the circumferential direction being the innermost And a collar member set shorter than the length along the circumferential direction of the circumferential coil.

  Further, in the rotating electrical machine stator according to the present invention, with respect to the winding coils wound around the adjacent teeth and adjacent to each other, the distance between the innermost peripheral coils is set to A, and each winding coil corresponds to the winding coil. It is preferable that B is set to be larger than A, where B is the distance between the adjacent flange members disposed as B.

  In the rotating electric machine stator according to the present invention, it is preferable that the flange member is disposed on the outer peripheral side with respect to the tip of the tooth.

  In the rotating electrical machine stator according to the present invention, it is preferable that the rotating electric machine stator further includes a mold part that fixes the winding coil and the flange member while pressing the winding coil against the core body side by the flange member.

  With the above-described configuration, the rotating electrical machine stator has the flange member of the magnetic material disposed further on the inner peripheral side of the innermost coil of the winding coil. And the length along the circumferential direction of the collar member is set shorter than the length along the circumferential direction of the innermost peripheral coil. According to the experimental results and the like, this can ensure output torque while suppressing eddy currents that can be generated in the winding coil.

  Further, in the rotating electric machine stator, winding coils wound around adjacent teeth and adjacent to each other are arranged corresponding to the respective winding coils, where A is the distance between the innermost peripheral coils. B is set to be larger than A, where B is the distance between adjacent adjacent flange members. According to the experimental results and the like, this can ensure output torque while suppressing eddy currents that can be generated in the winding coil.

  Further, in the rotating electrical machine stator, the flange member is disposed on the outer peripheral side with respect to the tip of the tooth. According to the experimental results and the like, this can ensure output torque while suppressing eddy currents that can be generated in the winding coil.

  The rotating electric machine stator further includes a mold portion that fixes the winding coil and the flange member while pressing the winding coil against the stator core side by the flange member. Thereby, a collar member can be made into a member different from a stator core, and a freedom degree increases about the dimension and arrangement position of a collar member.

It is a figure which shows the structure of the rotary electric machine stator of embodiment which concerns on this invention. It is a figure explaining the dimension and arrangement | positioning relationship of a collar member in the rotary electric machine stator of embodiment which concerns on this invention. It is a figure which shows the experimental result used as the foundation of this invention. It is a figure which shows the flow of the magnetic flux in a stator core, and the eddy current loss which generate | occur | produces in a winding coil by simulation about the case where a collar member is used. It is a figure which shows by simulation the flow of the magnetic flux in a stator core, and the eddy current loss which generate | occur | produces in a winding coil about the case of the prior art example which does not use a collar member for comparison.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, a description will be given of a stator core of a rotating electrical machine having tapered teeth that taper toward the inner peripheral side, but parallel-width type teeth other than the tapered type may be used. In addition, as the winding coil, a configuration in which a rectangular cross-section conductor is used and the teeth are double wound will be described, but a circular cross-section conductor may be used. It doesn't matter.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a diagram showing an overall configuration of the rotating electrical machine stator 10 and an enlarged view of one tooth. The rotating electrical machine stator 10 includes a stator core 12, a winding coil 20, and a flange member 30.

  The stator core 12 is an integral stator core having an annular core body 14 and a plurality of teeth 16 that protrude from the core body 14 toward the inner peripheral side and are arranged along the circumferential direction. Unlike the divided type in which a single stator core is formed by combining members divided into a plurality of parts in the circumferential direction, the integral type is configured to form an annular shape including a plurality of teeth with a single member. Specifically, a laminate of a plurality of electromagnetic steel sheets punched out of an annular shape including a plurality of teeth can be used as the stator core 12 as a predetermined shape.

  The teeth 16 are protrusions that wind the winding coil 20 around the teeth 16. As shown in the enlarged view of FIG. 1, the teeth 16 taper from the proximal end side toward the distal end side with the annular core body 14 side as the proximal end portion and the inner peripheral side as the distal end portion. It has a tapered shape.

  The winding coil 20 is a conductor wire covered with an insulating coating. The cross-sectional shape is a rectangular flat cross section as shown in the enlarged view of FIG. The winding coil 20 is double-wrapped at one winding position along the axial direction of the tooth 16, that is, at one winding position along the direction from the proximal end portion to the distal end portion. In the example of the enlarged view of FIG. 1, the number of turns is 8, and each winding is concentratedly wound in a double concentrated manner with the inner winding 22 and the outer winding 24.

  The eaves member 30 is a magnetic member disposed on the inner peripheral side of the innermost peripheral coil of the winding coil 20. As shown in the perspective view of FIG. 1, the teeth 16 have a rectangular shape on the inner peripheral side, but the collar member 30 is a rectangular frame-shaped member that surrounds the rectangular shape of the teeth 16. . The same material as the stator core 12 can be used for the magnetic material.

  The eaves member 30 is composed of a separate member independent of the stator core 12. The eaves member 30 is integrated with the winding coil 20 by the mold part 40 and fixed to the teeth 16. That is, the mold part 40 has a function of fixing the winding coil 20 and the flange member 30 while pressing the winding coil 20 against the core body 14 side by the flange member 30. An appropriate resin material can be used for the mold part 40.

  FIG. 2 is a diagram for explaining the dimensions and arrangement relationship of the flange member 30. Here, winding coils 20 and 21 wound around two adjacent teeth 16 are shown. A space formed by adjacent teeth 16 is referred to as a slot 18, and one slot 18 includes a winding portion on one side of the winding coil 20 on one side and a winding on one side of the winding coil 21 on the other side. A line part is arranged. The winding coil 21 on the other side also has a double concentrated winding of the inner winding 23 and the outer winding 25.

  Here, winding coils 20 and 21 wound around adjacent teeth 16 and adjacent to each other are arranged corresponding to the respective winding coils, where A is the separation distance between the innermost peripheral coils. Let B be the separation distance between the two flange members. FIG. 2 shows A and B. Here, in one slot 18, B is set to be larger than A for the adjacent flange members 30.

  Further, when viewed on one side of one flange member 30, the length C along the circumferential direction is set to be shorter than the length (2D + E + F) along the circumferential direction of the innermost coil. Here, D is a dimension along the circumferential direction of the inner winding 22 and the outer winding 24, E is a gap dimension between the inner winding 22 and the teeth 16, and F is an inner winding 22 and an outer winding. It is a gap dimension between the lines 24. FIG. 2 shows C, D, E, and F. Thus, the collar member 30 is set to a size that partially covers the innermost coil. In addition, the collar member of patent document 1 is made into the magnitude | size which covers the innermost periphery coil entirely.

  In addition, as shown in the enlarged view of FIG. 2, the flange member 30 and the tooth 16 are separate members, but the gap 42 between the flange member 30 and the side surface 44 of the tooth 16 is set as small as possible. The eaves member 30 and the side surface 44 of the tooth 16 may be in contact with each other, or may be coupled by fitting. Further, the flange member 30 is arranged at a position inside the slot 18 when viewed from the outer peripheral side, that is, from the distal end surface of the tooth 16 from the corner 46 at the distal end of the tooth 16. In addition, the front end surface of the collar member of Patent Document 2 is set at the same position as the front end surface of the teeth.

  Such dimensions and arrangement relationship of the eaves member 30 are based on the experimental results shown in FIG. The horizontal axis in FIG. 3 is the coil surface coverage, and the vertical axis is the torque output by the rotating electrical machine and the eddy current loss in the rotating electrical machine stator 10. The coil surface coverage is calculated by the following equation using C, D, E, and F in FIG. That is, the coil surface coverage (%) = {C / (2D + E + F)} × 100.

  According to FIG. 3, when the coil surface coverage is increased, the eddy current loss is reduced, but on the other hand, the torque output from the rotating electrical machine is also reduced. Therefore, if the coil surface coverage is not so high, the output torque can be secured while reducing the eddy current loss. In the example of FIG. 3, the eddy current loss is not further reduced even when the coil surface coverage is greater than 72%, but the output torque starts to gradually decrease. For this reason, the coil surface coverage is preferably about 72%. Based on this result, A, B, C, D, etc. in FIG. 2 can be set.

  Although not shown, when the distal end surface of the collar member 30 is disposed at the same position as the corner portion of the distal end of the tooth 16, the torque output by the rotating electrical machine is reduced as compared with the arrangement position illustrated in FIG. Therefore, as shown in FIG. 2, it is preferable that the front end surface of the flange member 30 is disposed on the outer peripheral side only before and after the one-turn dimension of the winding coil 20 from the front end surface of the tooth 16.

  4 and 5 are diagrams showing the results of confirming how the eddy current loss in the winding coil 20 changes with or without the flange member 30 by simulation. In these figures, the curve indicates how the magnetic flux flows, and indicates that the magnetic flux density is higher as the direction of the curve is the direction in which the magnetic flux flows and between the adjacent curves is denser. Regions 60 and 62 in which eddy current loss appears are shown in black. FIG. 4 shows the case of the prior art in which the flange member 30 is provided, and FIG. 5 shows the case of the prior art in which the flange member 30 is not provided for comparison.

  As can be seen from a comparison between FIG. 4 and FIG. 5, when the saddle member 30 is provided, eddy current loss appears only in a very limited region 60, but in the conventional technique in which the saddle member 30 is not provided, Eddy current loss appears in a fairly wide area 62 of the slot 18. The reason for this is considered that the flow of magnetic flux is concentrated at the teeth 16 and the eaves member 30 in FIG. 4, whereas the magnetic flux leaks considerably into the slot 18 in FIG.

  Thus, the torque output from the rotating electrical machine can be ensured while suppressing the eddy current loss of the winding coil 20 by appropriately adjusting the dimensions and the arrangement position of the flange member 30.

  The rotating electrical machine stator according to the present invention can be used for a rotating electrical machine mounted on a vehicle.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine stator, 12 Stator core, 14 Core main body, 16 teeth, 18 slots, 20, 21 Winding coil, 22, 23 Inner winding, 24, 25 Outer winding, 30 Hook member, 40 Mold part, 42 Gap , 44 (tooth side) side, 46 (tooth tip end face) corner, 60, 62 (eddy current loss appears) region.

Claims (4)

An integrated stator core having an annular core body, and a plurality of teeth protruding from the core body toward the inner peripheral side and disposed along the circumferential direction;
A winding coil wound around a tooth with a predetermined number of turns;
A magnetic flange member disposed further on the inner peripheral side of the innermost coil of the winding coil, and the length along the circumferential direction is set shorter than the length along the circumferential direction of the innermost coil A scissors member to be
A rotating electric machine stator comprising: In the rotating electrical machine stator according to claim 1,
For the winding coils wound around the adjacent teeth and adjacent to each other, the distance between the innermost peripheral coils is A, and between the adjacent flange members arranged corresponding to the respective winding coils. A rotating electrical machine stator, wherein a separation distance is B and B is set larger than A. The rotating electrical machine stator according to claim 2,
The rotating electric machine stator is characterized in that the flange member is disposed on the outer peripheral side of the tip of the tooth. In the rotating electrical machine stator according to any one of claims 1 to 3,
A rotating electrical machine stator, comprising: a mold portion that fixes a winding coil and a flange member while pressing the winding coil against the core body side by the flange member.

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