JPH07203646A - Winding for electric rotating machine - Google Patents

Abstract

PURPOSE:To provide a highly reliable winding for electric rotating machine, e.g. a high voltage stator winding, in which flow-out of impregnated resin is suppressed at the time of curing and the insulation structure thereof is excellent in viewpoint of cost, workability, etc. CONSTITUTION:In a high voltage stator winding 1, a single-sided glass collected mica tape is wound around a strand conductor 2 to form a main insulating layer 3 and a semi-cured both-sidel film collected mica tape is half-lap wound thereon thus forming a layer 4. A partial discharge prevention tape is further wound thereon to form a layer 5 and then the winding 1 is subjected to vacuum pressure impregnation with resin thus obtaining an insulation structure. The adhesive layer at the half-lap part is bonded tightly through a high viscosity compound thus preventing flow-out of impregnated resin at the time of curing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine winding, and is particularly useful when applied to a high voltage stator winding.

[0002]

2. Description of the Related Art The main functions required for an insulating structure of a high voltage stator winding manufactured by a full impregnation method are as follows. (1) Good resin impregnation property. (2) Good withstand voltage characteristics. (3) Good resin retention when cured. That is, there is little outflow of resin. (4) Good deterioration resistance.

On the other hand, recently, since the viscosity of the impregnating resin has been lowered and the impregnation technique has been improved, the impregnating property has almost disappeared. On the other hand, the decrease in viscosity causes a problem of outflow of the impregnated resin during curing. Especially when trying to reduce the insulation thickness in response to the demand for smaller and lighter equipment, the impregnation resin must be prevented from flowing out more than before.
Partial discharge accelerates deterioration. Therefore, in order to suppress the outflow of the impregnated resin, conventionally, a rotation curing method of curing the impregnated resin while rotating the stator, a method of performing a special sealing treatment, and the like have been adopted.

[0004]

However, in the case of the rotation hardening method among the above-mentioned methods according to the prior art, (1) equipment cost of the rotating device is required. (2) There are equipment restrictions on the size to be applied. (3) Since it is rotated, it is necessary to ensure the safety especially in work. (4) Since the resin rotates in an uncured state, the insulating layer may be damaged by vibration or the like.

Further, in the case of the method of performing the special sealing treatment, (1) extra work time is required for providing the sealing treatment layer, and the insulation thickness becomes thick. (2) Impregnability is impaired if the seal is completely performed.

In view of the above-mentioned prior art, the present invention provides a high voltage stator winding or the like which has less outflow of the impregnating resin at the time of curing, is highly reliable, and has an insulating structure superior to the conventional ones in terms of cost and workability. An object is to provide a rotating electric machine winding.

[0007]

Means for Solving the Problems The structure of the present invention for achieving the above object is a rotary electric machine winding having an insulating structure manufactured by impregnating an impregnating resin, wherein the insulating structure is provided on the outer periphery of a wire conductor. It is characterized by having a main insulating layer provided and a layer provided by winding a semi-cure film-assembled mica tape around the main insulating layer.

[0008]

According to the present invention having the above-mentioned structure, the impregnated resin is prevented from flowing out at the time of curing by the layer composed of the semi-cured film-assembled mica tape, and as a result, the reliability of the insulating structure is improved. Further, the layer also functions as a main insulating layer, and as a result, the thickness of the main insulating layer can be reduced.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view of a high voltage stator winding according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the structure of a semi-cure double film assembled mica tape.

As shown in FIG. 1, a high-voltage stator winding 1 according to this embodiment has a hexagonal shape with a linear portion of 500 mm obtained by bundling two 4.0 × 2.0 rectangular enamel copper wires 2a in 10 rows. And an insulating structure having a main insulating layer 3 made of a single glass laminated mica tape, a layer 4 made of both semi-cure film laminated mica tapes and a layer 5 made of a partial discharge prevention tape.

That is, this insulating structure is equivalent to the above-mentioned strand conductor 2
A single glass laminated mica tape having a thickness of 0.15 mm and a width of 20 mm is triple-wrapped on the outer circumference of the main insulating layer 3 to form a main insulating layer 3, and the main insulating layer 3 has a thickness of 0.1 mm and a width of 20 mm.
mm semi-cure both film mica tapes are wrapped in a single layer with half wrap to form layer 4, and then partial discharge tape is wound around the iron core insertion part to form layer 5 and a 6 mm thick aluminum plate It is manufactured by mounting a model iron core made of, and then subjecting an epoxy resin (hereinafter referred to as impregnating resin) to vacuum pressure impregnation.

As shown in FIG. 2, the semi-cure film-assembled mica tape has the assembled mica 4a at the center, and the semi-cure adhesive layer 4c is provided on both sides of the assembled mica 4a through the polyester films 4b. Commercially available products (such as Bonroll Isola (trade name: Samica film tape)) can be used as appropriate.

Therefore, according to the above insulating structure, the impregnating resin in the penetrating direction can be prevented from flowing out by the polyester film 4b of the mica tape (layer 4) assembled with both films, and the adhesive layer 4c of the tape can be dissolved in the impregnating resin. However, since the half-wrap portion is brought into close contact with the high-viscosity compound, the outflow of the impregnated resin from the half-wrap portion can be prevented. Further, since the layer 4 formed by the mica tapes assembled with both the semi-cure films also functions as the main insulating layer, the thickness of the main insulating layer 3 can be reduced accordingly. Moreover, in terms of cost and workability, it is superior to the conventional method for preventing the impregnated resin from flowing out.

As a comparative example, the thickness is 0.15 m.
A single glass laminated mica tape is wound around the outer circumference of a wire conductor with a width of 20 mm and a width of 4 in four layers with a half wrap.
The polyester film tape of No. 1 is prepared by single-wrapping with a half wrap, and the result of comparison between this comparative example and the above-described example will be described based on FIGS. FIG. 3 is a diagram showing tan δ-V characteristics, and FIG. 4 is a diagram showing dielectric breakdown strength (KJ / mm).

As shown in FIG. 3, the rising of tan δ is smaller in the example than in the comparative example. This indicates that the Example has less outflow of the impregnated resin and a greater effect of preventing impregnated resin outflow than the Comparative Example. See also FIG.
As shown in, the average of the example is about 2 as compared with the comparative example.
KV / mm Dielectric breakdown strength is improved. This indicates that the impregnated resin outflow prevention effect of the example contributes to the improvement of the dielectric breakdown strength.

[0017]

As described above in detail with reference to the embodiments, according to the present invention, the layers of the semi-cure film-assembled mica tape prevent the impregnating resin from flowing out during curing and improve the reliability of the insulating structure. By this layer, the thickness of the main insulating layer can be reduced. Moreover, it is superior in terms of cost and workability to the conventional method for preventing the outflow of the impregnated resin.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a high voltage stator winding according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a structure of a semi-cure film-assembled mica tape.

FIG. 3 is a diagram showing a tan δ-V characteristic comparison effect between an example and a comparative example.

FIG. 4 is a diagram showing an effect of comparison of dielectric breakdown strength between an example and a comparative example.

[Explanation of symbols]

 1 High-voltage stator winding 2 Wire conductor 3 Main insulating layer (single glass laminated mica tape) 4 layers (semi-cure double film laminated mica tape) 4a Integrated mica 4b Polyester film 4c Adhesive 5 layers (partial discharge prevention tape)

Claims (1)

[Claims] 1. A rotary electric machine winding having an insulating structure manufactured by impregnating an impregnating resin, wherein the insulating structure includes a main insulating layer provided on an outer periphery of a wire conductor,
A rotary electric machine winding, comprising: a layer formed by winding a semi-cure film laminated mica tape around the main insulating layer.