JP2010035344A - Stator of rotary electric machine, and the rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator of the rotary electric machine capable of reliably grounding a coil surface, by improving the thermal conductivity between the coil surface and an iron core, and electrical connections. <P>SOLUTION: The stator of the rotary electric machine includes: a stator iron core formed by laminating an annular steel plate, on which a plurality of slots 11a are arranged, in the axial direction along the inner periphery; and a stator coil 12 which is inserted into each of the plurality of slots 11a equipped with at least one conductor bundle 15, an insulating layer 16 surrounding this conductor bundle 15, and a semiconductor layer 17 surrounding the insulating layer 16 and which extends in the axial direction. The semiconductor layer 17 is formed, by partially superimposing a belt-like semiconductor sheet and a band-like elastic thermal conductive member on each other in the width direction, and spirally winding them around the outside of the insulating layer 16. The semiconductor sheet is, for example, made of a fibrous material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotating electric machine represented by a turbine generator, a turbine generator, and the like, and more particularly to a structure of a rotating electric machine stator in which a stator coil is inserted in a slot of a stator core.

  A general structure of a stator of a rotating electrical machine such as a conventional generator will be described with reference to the drawings (see Patent Document 1).

  FIG. 5 is a cross-sectional view showing the structure of one slot of the stator core in the stator of the conventional rotating electric machine.

  In the figure, the stator has a stator coil 12 disposed in a slot 11 a of the stator core 11. At this time, by disposing the lateral spacer material 27 and the longitudinal spacer material 13 between the slot 11a and the stator coil 12, or between each stator coil 12, the stator coil 12 is placed on one side of the slot 11a. While pressing down and fixing, the vibration at the time of driving | running | working etc. is suppressed, the heat | fever of a coil surface is transmitted to the stator core 11, and is dissipated.

In this case, the heat source during generator operation is Joule heat generated by a large current flowing through the conductor bundle 15. For example, in the indirect cooling generator, this Joule heat is transmitted to the stator core 11 through the insulating layer 16 disposed so as to wrap the conductor bundle 15.
JP 2003-304662 A

  In recent years, there has been a demand for a compact and high-power generator, but focusing on the stator of the generator, it is necessary to increase the current density and voltage of the conductor forming the stator coil.

  However, from the viewpoint of heat dissipation, it is possible to improve heat transfer from the conductor to the stator core, and from an electrical viewpoint, to prevent the generation of an arc between the stator coil 12 surface and the stator core 11. In addition, a reliable grounding of the stator coil surface is required.

  When the above-described lateral spacer material 27 is used, a corrugated FRP (fiber reinforced plastic) plate may be used for the lateral spacer material 27. In this case, a certain amount of air layer is interposed between the coil surface and the stator core. In other words, the coil surface and the stator core are in point contact from a microscopic viewpoint, and their thermal conductivity and electrical connection are not necessarily good. In other words, thermal connection is required from the viewpoint of heat dissipation, and electrical connection is required to reliably ground the coil surface.

  In order to achieve the above object, a stator of a rotating electrical machine according to the present invention includes a stator core in which a plurality of annular steel plates each having a plurality of slots arranged along an inner periphery are laminated in an axial direction, and each of the plurality of slots. And a stator coil extending in the axial direction, including at least one conductor bundle, an insulating layer surrounding the conductor bundle, and a semiconductive layer surrounding the insulating layer.

  The rotating electrical machine according to the present invention includes a stator core in which an annular steel plate in which a plurality of slots are arranged along an inner periphery is laminated in the axial direction, and is inserted into each of the plurality of slots, and includes at least one A stator having a conductor bundle, an insulating layer surrounding the conductor bundle and a semiconductive layer surrounding the insulating layer, and a stator coil extending in the axial direction is provided.

  Since the stator of the rotating electrical machine of the present invention is configured as described above, good surface contact between the stator coil and the iron core can be obtained. By improving the surface contact, heat transfer and electrical connection are improved, and the heat dissipation of the coil can be enhanced without impairing the electrical insulation characteristics, which can contribute to the improvement of the efficiency of the rotating electrical machine.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  FIG. 1 is a cross-sectional view of one slot of the stator core of the rotating electrical machine according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the configuration of the semiconductive layer in FIG. It is.

  In FIG. 1, the stator coil 12 is configured by covering a conductor bundle 15 with an insulating layer 16 and surrounding the periphery with a semiconductive layer 17. The stator coil 12 is housed in two upper and lower stages in a slot 11a provided in the stator core 11, and a wedge 14 is inserted in an opening of the slot 11a and fixed in the slot 11a. Spacer members 13 are inserted between the upper and lower sides of the stator coil 12, between the stator coil 12 and the bottom surface of the slot 11a, and between the stator coil 12 and the wedge 14, respectively.

  As shown in FIG. 2, the semiconductive layer 17 is a tape formed by partially overlapping a semiconductive sheet 31 made of a fibrous material and an elastic heat conductive member 32 over the longitudinal direction of the stator coil 12. It is formed by wrapping in a shape. Here, it is preferable that the elastic heat conductive member 32 is disposed in the range of (1/4) W to (3/4) W with respect to the width W of the semiconductive sheet 31.

  In this embodiment, the semiconductive sheet 31 is a polyester non-woven fabric coated with carbon black. The surface resistance of the semiconductive sheet 31 was 500Ω. Further, as the elastic heat conductive member 32, silicone rubber was used.

  With such a configuration, after inserting the stator coil 12 into the slot 11a, the resistance between the stator coil 12 and the stator core 11 was measured and found to be 1,000Ω. Moreover, it was 0.3 W / m * K when the heat conductivity of the semiconductive layer 17 was measured. On the other hand, when the thermal conductivity of the conventional stator shown in FIG. 5 at the portion of the spacer material 27 was measured, it was 0.13 W / m · K.

  Thus, in the configuration of this embodiment, the contact between the fibrous material and the surface of the elastic thermal conductive member is improved, and the thermal contact property is improved.

  In the present embodiment, a semiconductive sheet having a surface resistance of 500Ω is used, but other materials may be used as long as they have a resistance of 100Ω or more and 10,000Ω or less. In addition, although silicone rubber is used as the elastic heat conductive member, other materials may be used as long as the rubber hardness is several tens or less. The elastic thermal conductive member preferably has a thermal conductivity of 0.5 W / m · K or more.

  Next, a modification of the first embodiment will be described.

  As the semiconductive sheet 31 forming the semiconductive layer 17 shown in FIG. 1, a polyester non-woven fabric coated with carbon black is used in the first embodiment. However, in this modification, the glass cloth is made of carbon. A material coated with black was used, and a silicone gel, which is a gel material, was used as the elastic thermal conductive member 32.

  In this configuration, the thermal conductivity of the semiconductive layer 17 was measured and found to be 0.33 W / m · K.

  As the elastic heat conductive member 32, a liquid photocurable RTV-M4601 made of Asahi Wacker Silicone was used before inserting the coil. In this case, when the coil is inserted, the heat conductive member 32 flows into the gap between the semiconductive layers 17, so that the liquid heat conductive member 32 is formed in a portion where the gap between the stator coil 12 and the stator core 11 is narrow. After flowing and filling the gap, it was cured and could be filled easily throughout.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. However, the configuration shown in FIG. 1 is the same as that of the first embodiment, and redundant description is omitted here.

  In the present embodiment, the semiconductive sheet 31 is a glass cloth coated with carbon black, and the liquid conductive Asahi Wacker silicone RTV-M4601 is used as the heat conductive member 32 to form the semiconductive layer 17. Further, the tube material 43 is arranged at the joint of the semiconductive sheet 31 so as to cover the joint of the semiconductive sheet 31.

  When the gap between the stator coil 12 and the stator core 11 is large, it is necessary to increase the coating thickness of the heat conductive member 32 that is a liquid material. However, when the coating thickness is increased, the heat conductive member 32 leaks out before inserting the coil, impairing workability, and the heat conductive member 32 is hardened after the stator coil 12 is inserted. There is a risk of further leaking out before contact with the slot 11a.

  In the present embodiment, the tube material 43 made of a flexible material is arranged at the joint of the semiconductive sheet 31, and the joint of the semiconductive sheet 31 is closed with the tube material 43. Therefore, the leakage of the liquid heat conductive member 32 is suppressed, so that good characteristics can be maintained.

  In this configuration, when the tube member 43 is wound around the joint of the semiconductive sheet 31, the winding tension is adjusted.

  That is, since the size of the gap between the stator coil 12 and the stator core 11 may differ depending on each coil, the tube material 43 at the winding position is increased by increasing the tension force of the tube material 43 in a place where the gap is small. By reducing the diameter of 43, the outflow of the liquid heat conductive material from the gap between the tube material 43 and the semiconductive sheet 31 can be easily suppressed.

  Further, in a place where the gap between the stator coil 12 and the stator core 11 is large, the tension force of the tube material 43 is reduced so that the diameter of the tube material 43 is substantially the same as that of the unloaded (tension force is 0). By doing so, the liquid heat conductive member 32 is prevented from flowing out of the gap.

(Third embodiment)
Next, a third embodiment of the stator of the rotating electrical machine according to the present invention will be described with reference to FIG. However, the configuration shown in FIG. 1 is the same as that of the first embodiment, and redundant description is omitted here.

  In this embodiment, the configuration of the semiconductive layer 17 is the same as that of the second embodiment shown in FIG. 3, but instead of winding the tube material 43 along the joint of the semiconductive sheet 31, the joint is formed. It is covered with a tape-shaped sealing material 53.

  When the coating thickness of the liquid thermal conductive member 32 on the joint of the semiconductive sheet 31 is increased, the liquid thermal conductive member 32 is cured after the stator coil 12 is inserted in the configuration of FIG. The heat conductive member 32 may leak from the gap between the semiconductive sheets 31 before inserting the coil, and the contact effect may be reduced. On the other hand, by adopting the configuration as in the present embodiment, even when the interval between the joints of the semiconductive sheet 31 is large, leakage of the liquid thermal conductive member 32 can be suppressed, and further excellent characteristics are maintained. can do.

  Here, if the tape-like sealing material 53 is made of a semiconductive material, in addition to suppressing the leakage of the liquid heat conductive member 32, the taper sealing material 53 can also have good characteristics with the stator core. Can be maintained.

FIG. 3 is a cross-sectional view showing a configuration of one slot portion of the stator of the rotating electric machine showing the first embodiment of the present invention. FIG. 2 is a partial enlarged cross-sectional view illustrating a configuration of a semiconductive layer in FIG. 1. FIG. 6 is a partial enlarged cross-sectional view showing a configuration of a semiconductive layer in a second embodiment of the present invention. The partial expanded cross-sectional view which shows the structure of the semiconductive layer in the 3rd Embodiment of this invention. The partial expanded cross-sectional view which shows the structure of 1 slot part of the stator of the conventional rotary electric machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Stator core 11a ... Slot 12 ... Stator coil 13 ... Spacer material 14 ... Wedge 15 ... Conductor bundle 16 ... Insulating layer 17 ... Semiconductive layer 27 ... Spacer material 31 ... Semiconductive sheet 32 ... Thermally conductive member 43 ... Tube material 53 ... Sealing material

Claims (11)

A stator core in which an annular steel plate in which a plurality of slots are arranged along the inner periphery is laminated in the axial direction;
A stator coil inserted in each of the plurality of slots and including at least one conductor bundle, an insulating layer surrounding the conductor bundle, and a semiconductive layer surrounding the insulating layer, and extending in the axial direction;
A stator for a rotating electrical machine, comprising:   The stator of a rotating electrical machine according to claim 1, wherein the semiconductive layer includes a semiconductive sheet and an elastic thermal conductive member.   The semiconductive layer is formed by spirally winding a strip-shaped semiconductive sheet and a strip-shaped elastic thermal conductive member on each other in the width direction so as to overlap each other. Item 3. A rotating electric machine stator according to Item 2.   The stator for a rotating electric machine according to claim 2 or 3, wherein the semiconductive sheet is made of a fibrous material.   3. The elastic heat conductive member is a time-curing material that has a gel shape before insertion of a stator coil into the slot and is cured and elastic after insertion of the stator coil into the slot. The stator of the rotary electric machine as described in any one of thru | or 4.   The stator for a rotating electrical machine according to claim 5, wherein a liquid leakage suppressing member is inserted at a joint of the semiconductive sheet after the semiconductive sheet is wound around the outside of the insulating layer.   The stator of a rotating electric machine according to claim 6, wherein the liquid leakage suppressing member is made of a flexible tube material.   The diameter of the tube is wound along the gap of the seam of the semiconductive sheet while applying tension to the tube so as to fit the gap of the seam of the semiconductive sheet. Stator of rotating electrical machine.   The stator of a rotating electric machine according to claim 6, wherein the liquid leakage suppression member is made of a flexible tape material.   The stator for a rotating electrical machine according to claim 9, wherein the tape material is made of a semiconductive fibrous material. A stator core in which an annular steel plate in which a plurality of slots are arranged along the inner periphery is laminated in the axial direction;
A stator coil inserted in each of the plurality of slots and including at least one conductor bundle, an insulating layer surrounding the conductor bundle, and a semiconductive layer surrounding the insulating layer, and extending in the axial direction;
A rotating electrical machine comprising a stator having

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