JPH02156605A - Insulating coil for electric apparatus - Google Patents

Abstract

PURPOSE:To reduce the work deterioration of a turn insulating material produced at the time of bending by surrounding the outside surface of an electric wire bundle with the turn insulating material of an insulating sheet, etc., after the electric wire bundle is formed of several insulated electric wires and winding a slipping material around the turn insulating material on the electric wire bundle. CONSTITUTION:An electric wire bundle 7 is formed by putting conductors 5 coated with an insulating material 6 together and the outside surface of the bundle 7 is surrounded with a turn insulating material 8. Then a slipping material 10 is wound around the insulating material 8 on the bundle 7. An insulating material having a small coefficient of friction, such as a polyester film, Teflon, polyamidimide film, etc., is used for the slipping material. Because of the slipping material 10, a well homogenized turn insulation can be obtained, since the turning insulating material does not move and opening at the end sections can be prevented. Therefore, the work deterioration of the turn insulating material can be reduced at the time of bending.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] 'The present invention relates to a method for manufacturing an insulated wire ring for electrical equipment, and particularly to an improvement of an insulating structure suitable for a wire ring used at high voltage.

[Conventional technology]

FIG. 2 shows a conventional example of an insulated wire ring for electrical equipment. Straight section 1° curved corner section 2 as shown in the same figure
In order to manufacture a tortoiseshell-shaped insulated wire ring 4 having a head 3, as shown in FIGS. An electric wire bundle 7 is formed, and a turn insulating material 8 such as an insulating sheet is surrounded on the outer periphery of the electric wire bundle 7, which is called inter-turn insulation. Then, a plurality of coated wire bundles coated with the turn insulating material 8 are wound around a single winding die a predetermined number of times to make a sea cucumber-shaped wire ring, and then this sea cucumber-shaped wire ring is drawn and bent using a forming machine. Use a pull-out machine to bend it and form it into a tortoiseshell shape.

In manufacturing the insulated wire ring 4 in this way, for example, Japanese Patent Publication No. 58-21234 is used to perform the above-mentioned turn insulation.
As shown in Figure 3, what is disclosed in Publication No. 9 is -
The wire bundle 7 constituting the turn is wrapped in a turn insulating material 8 extending along its longitudinal direction, and the ends of the turn insulating material 8 are discontinuously disposed in the longitudinal direction with an adhesive 9 or an adhesive material such as adhesive tape. A method has been proposed in which the bundle of covered wires is adhesively fixed and then covered with the turn insulating material 8 and then wound around a sea cucumber-shaped winding form. In the case of this method, it is not necessary to first form the wire into a hexagonal shape and then disassemble each turn to insulate the turns.Furthermore, the ends of the turn insulators are discontinuously bonded in the longitudinal direction using an adhesive. Since it is fixed with adhesive,
This has the advantage that the impregnated resin can easily enter from the non-bonded part. but,
In this method, turn insulation is applied to the wire bundle 7 before forming it into a hexagonal shape, so as the wire bundle 7 is plastically worked during forming into a hexagonal shape, the turn insulating material 8 suffers processing deterioration. There were drawbacks.

For example, in the case of a tortoiseshell-shaped insulated wire ring 4, the wire bundles 7 are arranged in the flatwise direction at the curved corner section 2 and the head section 3, which are formed continuously with the straight section 1 inserted into the core slot. When the wire bundle 7 is processed in the edgewise direction, the turn insulating material 8 at the bent portion is subject to processing deterioration such as elongation and cracking as the wire bundle 7 is processed. In particular, when a part of the inter-turn insulation material is adhesively fixed with an adhesive member and becomes a bent part, it is difficult for the insulation material to stretch and absorb the difference in the inner and outer diameters of the bending process. There was a drawback that cracks in the turn insulating material 8 were easily promoted. Also,
The turn insulation materials 8 come into strong contact with each other during one bending process between adjacent turn insulation materials 8, and the turn insulation materials 8 may be damaged due to the frictional force at that time.

It is well known that the turn insulating material 8 at the location where processing deterioration has occurred cannot maintain its initial thickness, resulting in a lower dielectric breakdown voltage compared to other locations. This not only reduces reliability but also shortens the life of the electrical equipment in which the insulated coil 4 is incorporated. Therefore, in order to deal with these problems, insulating tape is generally wrapped around weak points of dielectric strength that have undergone processing deterioration as reinforcing insulation.
Efforts are being made to improve dielectric breakdown voltage. However, −
First, the hexagonal-shaped insulated wire ring 4 is disassembled turn by turn, and the deteriorated parts of the turn insulating material 8 of each bundle of covered wires are wrapped with insulating tape, etc., making production by mechanization possible. It is cumbersome and inefficient.

[Problem to be solved by the invention]

An object of the present invention is to provide an insulated wire ring for electrical equipment that can be manufactured with high reliability by reducing processing deterioration of the turn insulation of the insulated wire ring using an extremely simple method.

[Means to solve the problem]

In order to achieve this object, in the present invention, a plurality of electric wires each having an insulating material applied to the conductor are put together to form an electric wire bundle, and then the outer periphery of the electric wire bundle is surrounded with a turn insulating material such as an insulating sheet, and then The feature is that the insulating properties of the wire ring are improved by wrapping it with a sliding material that has a low coefficient of friction.

[Effect]

The structure of the insulated wire ring of the present invention is that a sliding material is used around the outer periphery of a bundle of covered wires covered with a turn insulating material, and the turn insulating material is tightened to ensure that the entire surface of the conductor is covered. Since a sliding material is provided on the outer periphery of the turn insulation when it is wrapped around the turn insulation, the sliding material is interposed between the turn insulation, which reduces processing deterioration of the turn insulation material during bending. can.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

Generally, the stator electric insulating wire of a rotating electric motor such as a high-voltage motor has a hexagonal shape as shown in FIG. These wire rings 4 are composed of a straight part 1 inserted into the core slot, a curved corner part 2 formed continuously, and a head part 3. FIG. 1 is an enlarged perspective view showing the state in which the conductor is flat-wound insulated during the manufacture of the coil shown in FIG. 2. As shown in FIG. 1, several electric wires each having a conductor 5 coated with an insulating material 6 are put together to form a wire bundle 7, and a turn insulating material 8 is surrounded around the outer periphery of the wires. Furthermore, a sliding material 10 is wrapped around the outer periphery of the turn insulating material 8.

This sliding material is preferably an insulating material with a small coefficient of gravity, such as polyester film, Teflon, or polyamide-imide film. By winding the sliding material 10, there is no shift of the turn insulating material 8, opening of the end portion, etc., and turn insulation with good homogeneity can be obtained.

Also 1 on the 1st volume type! When the wire bundle 7 is wound, the sliding material 10 is interposed between adjacent turn insulating materials 8, which has the effect of reducing damage caused by rubbing of the insulating materials against each other.

Furthermore, even when a sea cucumber-shaped wire ring is bent using a pull-out machine and formed into a hexagonal shape, the action of the sliding material 8 interposed between the turn insulators 8 makes it possible to easily produce a wire ring with little processing deterioration.

can be manufactured.

〔Effect of the invention〕

According to the present invention, an insulated coil can be easily manufactured.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an insulated wire ring for electrical equipment according to an embodiment of the present invention, Fig. 2 is a perspective view of an insulated wire ring for electrical equipment, and Fig. 3 is an example of manufacturing turn insulation by a conventional manufacturing method. Perspective view, 4th
The figure is a cross-sectional view taken along line IV-IV in FIG. 2 according to a conventional manufacturing method. DESCRIPTION OF SYMBOLS 1... Straight part, 2... Part of curved corner, 3... Head, 4... Insulated wire ring, 5... Conductor, 6... Insulating material,
7... Electric wire bundle, 8... Turn insulation material, 9... Adhesive, 10... Sliding material.

Claims (2)

[Claims] 1. After forming an electric wire bundle by combining a plurality of electric wires whose conductors are coated with an insulating material, flat-wrap insulation is applied to surround the outer periphery of the electric wire bundle with an insulating sheet, and the electric wire bundle surrounded by the insulating sheet is shaped into a winding form. The electric wire is wound a predetermined number of times to create a sea cucumber-shaped wire ring, and the wire ring is bent to form a hexagonal shape having a straight portion, a curved corner portion, and a head, and the electric wire is wound into the winding form. An insulated wire ring for electrical equipment, characterized in that a sliding material is arranged around the insulating sheet of the bundle. 2. The insulated wire ring for electrical equipment according to claim 1, wherein the sliding material is tape-shaped and is wound continuously or discontinuously in the longitudinal direction of the wire bundle.