JP2015133810A - Stator of dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the stator of a dynamo-electric machine in which the interphase insulation distance can be expanded on the outside of a coil.SOLUTION: The stator of a dynamo-electric machine includes a stator core 20 having a yoke 11, teeth 12, a teeth tip yoke 13, and a slot 14 surrounded by the yoke 11, teeth 12, and teeth tip yoke 13, a non-expandable insulation member 30 covering the wall of the slot 14, coils 50 of U phase, V phase and W phase wound concentrically around the teeth 12 from above the insulation member 30, and a thermal expansion insulating sheet 40 inserted between the phases of the coil 50 in the slot 14, and thermally expanded to expand the interphase insulation distance of the coil 50.

Description

  The present invention relates to a stator of a rotating electric machine, and relates to interphase insulation between adjacent U-phase, V-phase, and W-phase coils of the stator.

  Conventionally, a stator core having a yoke part, a tooth part, and a slot surrounded by the yoke part and the tooth part, and an adhesive sheet including an adhesive and a foaming component covering the wall part of the slot, Adhesion including U-phase, V-phase, and W-phase coils separately and concentratedly wound on each of the teeth portions from above the adhesive sheet, and an adhesive and a foaming component inserted between phases of the coils in the slot A stator of a rotating electric machine including a seat is disclosed (for example, see Patent Document 1).

  Further, conventionally, there is provided a stator core having a plurality of teeth formed thereon, a stator coil wound around the teeth by concentrated winding, and a stator manufacturing method including a stator coil wound in advance in a slot. A step of covering the accommodating portion to be accommodated with a covering sheet that exhibits adhesiveness and expandability by heating, and an inserting step of inserting at least one stator coil covered with the covering sheet into the teeth together with the covering sheet; A method for manufacturing a stator is disclosed in which a covering sheet inserted into a tooth for each stator coil is heated, and the covering sheet contains a foam filler that foams by heating and is formed into a sheet of resin. (For example, refer to Patent Document 2).

JP 2007-089295 A JP 2012-223056 A

  However, according to the conventional techniques described in Patent Documents 1 and 2, since the thermal expansion insulating sheet is interposed between the wall portion of the slot and the coil and between the phases of the coil, the coil is formed between the inner side and the outer side. There is a problem that the insulation distance between the outer sides of the coil cannot be increased by being pressed from both sides.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the stator of a rotary electric machine which can expand the insulation distance between the phases of the outer side of a coil.

  In order to solve the above-described problems and achieve the object, the present invention includes a yoke portion, a teeth portion, a teeth tip yoke portion, a slot surrounded by the yoke portion, the teeth portion, and the teeth tip yoke portion, A non-expandable insulating member that covers the wall of the slot, and a U-phase, a V-phase, and a W-phase separately concentrated and wound around the teeth from above the insulating member. A coil and a thermal expansion type insulating sheet that is inserted between the phases of the coils in the slot and is expanded by heating to expand the inter-phase insulation distance of the coils.

  According to the present invention, the non-expandable insulating member that covers the wall portion of the slot, and the thermal expansion type insulating sheet that is inserted between the phases of the coils in the slot and expands the interphase insulating distance of the coils, Insulation reliability can be improved.

FIG. 1 is a cross-sectional view showing an embodiment of a stator for a rotating electrical machine according to the present invention. FIG. 2 is a partially enlarged view of FIG. FIG. 3 is a perspective view showing a laminated structure of the thermally expandable insulating sheet according to the embodiment. FIG. 4 is a cross-sectional view illustrating a state in which the thermally expandable insulating sheet according to the embodiment expands. FIG. 5 is a partially enlarged view of FIG. 2 showing the thermal expansion type insulating sheet of the embodiment disposed between the stator coils before expansion. FIG. 6 is a partially enlarged view of FIG. 2 showing the expanded thermal expansion type insulating sheet according to the embodiment disposed between the phases of the stator coils. FIG. 7 is a perspective view showing a state of heat conduction of the thermal expansion type insulating sheet of the embodiment.

  Hereinafter, embodiments of a stator for a rotating electrical machine according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment FIG. 1 is a transverse sectional view showing an embodiment of a stator of a rotating electric machine according to the present invention, and FIG. 2 is a partially enlarged view of FIG.

  As shown in FIGS. 1 and 2, the stator 90 of the rotating electrical machine according to the embodiment is formed by connecting a plurality of T-shaped split iron cores 10 having a yoke part 11, a tooth part 12, and a tooth tip yoke part 13. A stator core 20 formed in a cylindrical shape is provided. The split iron core 10 is formed by laminating electromagnetic steel plates. A slot 14 for accommodating a coil 50 to be described later is formed so as to be surrounded by the yoke part 11, the tooth part 12 and the tooth tip yoke part 13. In addition, rectangular notches 15 are formed on the slots 14 side at both ends in the circumferential direction of the yoke 11 and the tooth tip yoke 13. The rotating electrical machine of the embodiment is a three-phase concentrated winding rotating electrical machine in which U-phase, V-phase, and W-phase coils 50 are concentratedly wound around each tooth portion 12.

  Both end portions in the axial direction of the tooth portion 12 of the split core 10 and the wall portion of the slot 14 are covered with a non-expandable insulating member 30 such as an insulator, insulating paper, or insulating coating. The coil 50 is wound around the tooth portion 12 from above the insulating member 30. The insulation member 30 covers both ends of the teeth 12 in the axial direction and the walls of the slots 14 and winds the coils 50 on the individual divided cores 10 before the stator core 20 is assembled.

  FIG. 3 is a perspective view illustrating a laminated structure of the thermally expandable insulating sheet according to the embodiment, and FIG. 4 is a cross-sectional view illustrating a state in which the thermally expandable insulating sheet according to the embodiment expands. As shown in FIGS. 3 and 4, the thermally expandable insulating sheet 40 of the embodiment is bonded to the insulating layer 41, the expanded layer 42 bonded to both surfaces of the insulating layer 41, and the outside of the expanded layer 42. A sheet having a five-layer structure. The insulating layer 41 has a vertical and horizontal dimension that is 1 mm or more larger than the expansion layer 42 and the adhesive layer 43, and the vertical and horizontal ends protrude from the ends of the expansion layer 42 and the adhesive layer 43. As shown in FIG. 4, the thermal expansion adhesive sheet 40 is expanded by the expansion of the expansion layer 42 by heating, and then cured.

  As shown in FIG. 1 and FIG. 2, when the divided core 10 in which the U-phase, V-phase, and W-phase coils 50 are concentratedly wound around the respective teeth portions 12 is assembled into a cylindrical shape, thermal expansion occurs between the phases of the coils 50. The mold insulating sheet 40 is inserted, and the end portion of the insulating layer 41 from which the thermal expansion insulating sheet 40 protrudes is sandwiched between the cutout portions 15 of the split iron core 10.

  FIG. 5 is a partially enlarged view of FIG. 2 showing the thermal expansion type insulating sheet of the embodiment arranged between the phases of the stator coils before expansion, and FIG. 6 is an implementation arranged between the phases of the stator coils. It is the elements on larger scale of FIG. 2 which shows the expansion | swelling of the thermal expansion type insulating sheet of a form. As shown in FIGS. 5 and 6, when the thermal expansion type insulating sheet 40 is heated, the expansion layer 42 expands in the thickness direction, and the coil 50 is pressed toward the insulating member 30 side (the teeth portion 12 side). The adhesive layer 43 fixes the coil 50 by pressure bonding.

  The adhesive layer 43 prevents displacement between the thermal expansion insulating sheet 40 and the coil 50, and prevents frictional deterioration of the insulating coating of the coil 50 from disturbances such as vibration and impact. Moreover, when the thermal expansion type insulation sheet 40 expands in the thickness direction, the interphase insulation distance between the U phase, the V phase, and the W phase is increased, and the insulation reliability is improved.

  FIG. 7 is a perspective view showing a state of heat conduction of the thermal expansion type insulating sheet of the embodiment. The insulating layer 41 of the thermal expansion type insulating sheet 40 is formed of an anisotropic highly insulating high thermal conductive material. As shown in FIG. 2, since the end portion of the insulating layer 41 protruding from the thermal expansion type insulating sheet 40 is sandwiched between the cutout portions 15 of the split iron core 10, the thermal conductivity of the insulating layer 41 is increased. Thus, the heat generated in the coil 50 can be radiated to the stator core 20. In addition, since the insulating layer 41 has anisotropy, heat can be radiated in a required direction such as an axial direction or a radial direction of the stator core 20.

  As described above, the stator of the rotating electrical machine according to the present invention is useful because of high insulation reliability and heat dissipation.

10 divided iron cores, 11 yoke portions, 12 teeth portions, 13 teeth tip yoke portions, 14 slots, 15 notched portions, 20 stator cores, 30 insulating members, 40 thermal expansion type insulating sheets, 41 insulating layers, 42 expanded layers, 43 Adhesive layer, 50 coils, 90 Rotating electric machine stator.

Claims (4)

A stator core having a yoke portion, a teeth portion, a teeth tip yoke portion, and a slot surrounded by the yoke portion, the teeth portion and the teeth tip yoke portion;
A non-inflatable insulating member covering the wall of the slot;
U-phase, V-phase, and W-phase coils separately and concentratedly wound on each of the teeth portions from above the insulating member;
A thermal expansion type insulating sheet that is inserted between the phases of the coils in the slot and is expanded by heating to expand the interphase insulation distance of the coils;
A stator for a rotating electric machine comprising:   The thermal expansion type insulating sheet includes an insulating layer having high thermal conductivity, an expanded layer bonded to both sides of the insulating layer, and an adhesive layer bonded to the outside of the expanded layer. The stator of the rotary electric machine according to claim 1.   The stator of a rotating electrical machine according to claim 2, wherein the insulating layer is formed of an anisotropic polymer material, and ends thereof protrude from ends of the expansion layer and the adhesive layer. The stator iron core is formed in a cylindrical shape by connecting a plurality of split iron cores having the yoke portion, the teeth portion, and the tooth tip yoke portion, and on the slot side at both circumferential ends of the yoke portion and the tooth tip yoke portion. The stator for a rotating electrical machine according to claim 3, wherein a notch is formed, and the protruding end of the insulating layer is sandwiched between the notches.