JPH01274634A - Insulated coil for electric machinery - Google Patents

Abstract

PURPOSE:To improve taping performance, by arranging insulation sheet members on the opposite side faces at bending sections of a coil conductor unit at the corner and head sections of a coil. CONSTITUTION:An electrical stator coil 4 for an electrical machine comprises a linear section to be inserted into a core slottle and corner and head sections 6, 5 projecting continuously to the linear section. Several wires comprising conductors 1 applied with insulation 2 are bundled, then electrical insulation member such as insulation tape mainly composed of mica tape is applied on the outer circumference of the bundle thus forming a main insulation 3. Insulation sheet members 7 are arranged on the inner and outer radial side faces at bending head sections 5 and corner sections 6 in order to reduce the gap between a conductor unit and the main insulation layer. By such arrangement, taping performance of mica tape is improved.

Description

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

[Conventional technology] Insulated wire rings for electrical equipment are shown in Figure 1.

It has a tortoise shell shape, and the cross section taken along the line nn in Figure 1 is the second one.
The structure of these insulated wire rings shown in the figure is as shown in FIG. It is wrapped with an electrically insulating material such as insulating tape mainly made of mica tape.

In a method of manufacturing such an insulated wire ring, in general, a predetermined number of electric wires constituting a -turn are wrapped together around a winding form a predetermined number of times to produce a sea cucumber-shaped wire ring. This sea cucumber-shaped wire ring is expanded using a pull-out machine and molded into a tortoiseshell shape. Furthermore, a method is used in which the main insulation, mainly made of mica tape, is applied directly over the entire insulated wire ring.

[Problem to be solved by the invention]

During the main insulation process, the insulated wire has a complex shape with a straight part inserted into the core slot, a curved part that continuously protrudes, a corner part, and a ring head. Since the main insulation, which is mainly made of mica tape, is applied directly to the ring, the interface between the conductor unit of the ring and the main insulation and the main insulation are There were problems in that large voids were formed between each mica tape layer, resulting in poor homogeneity of the main insulation and poor insulation properties.

Therefore, as a method of twin-twisting these, for example, in Japanese Utility Model Application Publication No. 62-111753, polyester felt is wrapped half-wound or end-twisted once or twice in advance around a conductor unit with a complicated wire ring shape. The method used is to wind the material around and then apply main insulation, mainly made of mica tape, on top of it. For this method.

By arranging felt, the complicated shape is relaxed,
The taping properties of the mica tape have been improved, and therefore, during resin impregnation and curing processing, the retention of the impregnated resin on the conductor unit surface of the coil, the felt part, and between each mica tape layer has been improved, and the amount of leakage of the impregnated resin has been reduced. can be done.

However, in the case of this method, (1) felt is wrapped around the four sides of the cross section of the insulated wire shaft, top and bottom, and both sides, so the dimension from the conductor unit surface to the outermost periphery of the main insulation layer becomes thicker, and the wire ring becomes larger.

(2) When a wire ring is inserted into the core slot, the gap between adjacent wire rings is reduced, making it easier to incorporate the wire ring into the core slot, making it possible to increase the size of the entire device. Become.

(3) When it is necessary to inject resin into the insulating layer, the greater the thickness of the insulating layer, the lower the injectability of the resin.

It is necessary to increase the injection time.

(4) Since the felt is placed over all four sides of the cross section of the insulated wire shaft, a large amount of material is required and a lot of work time is required, resulting in high manufacturing costs.

Therefore, a simple and highly efficient manufacturing method that improves these problems is desired.

An object of the present invention is to impregnate the interface between the wire conductor unit and the main insulation, such as the corner 9 head of the wire wire, and between each mica tape layer of the main insulation, in an extremely simple method, in the production of electrically insulated wire rings. An object of the present invention is to provide a wire ring capable of shortening resin injection time.

[Means to solve the problem]

When main insulation is applied, the present invention is particularly effective at the inner diameter side of the bending part of complex parts of the wire ring shape, such as the corner two heads of the wire wire, where voids are likely to occur at the interface between the conductor unit and the main insulation. The intended purpose was achieved by placing two sheets of insulating material on the outside diameter side, and then applying main insulation, mainly made of mica tape, on top of that. It is.

[Effect]

The structure of the insulated wire shaft in this invention is as follows:
By arranging sheet-like insulating material on both sides of the bent part of the wire ring conductor unit in the head, the complicated shape is alleviated.
When taping the mica tape, the gap between the mica tape and the surface of the conductor unit is reduced, so taping performance is improved.

Therefore, during resin impregnation and curing treatment, the retention of the impregnated resin between the surface of the conductor unit of the coil, the sheet insulation material, and each mica tape layer is improved, and the amount of leakage of the impregnated resin can be reduced.

〔Example〕

Preferred embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

Generally, the stator electric coil of a rotating electric motor such as a high voltage induction motor has a hexagonal shape as shown in FIG. These wire rings 4 are composed of a straight part inserted into the core slot, a curved part that projects continuously from the straight part, and a head 5. Here, the most protruding part located outside the core slot continuous from the end of the straight part is called a head 5, and each bent part from the straight end to the head 5 is called a corner part 6.

FIG. 2 is an enlarged view of FIG.

Several electric wires with insulation material 2 applied to conductor 1 are gathered together, and an electrical insulation material such as insulation tape mainly made of mica tape is wrapped around the outer periphery of the wires, called ground insulation, to provide main insulation 3. is forming.

The present invention provides a method for reducing the gap between the interface between the conductor unit and the main insulating layer on at least one side surface of the inner diameter side and the outer diameter side of the bent portion of the head 5 and corner portion 6 of the wire ring 4. A sheet-like insulating material is placed between the two.

The sheet-shaped insulating material is preferably a polyester nonwoven fabric or the same material as the electrical insulating material used for the main insulation, which is cut into a sheet shape.

FIG. 3 shows a cross-sectional view of the head portion 5 and corner portion 6 of the wire ring 4 in an embodiment according to the present invention.

In the embodiment shown in FIG. 3, a wire conductor unit made up of a plurality of conductors 1 is covered along both sides of the inner diameter side and the outer diameter side of the bent portion.

A sheet-like insulating material 7 is arranged. After that, wrap electrical insulating material such as mica tape over the main insulation material.
Form 3.

In this way, the corner portion 6 of the wire ring 4 is where a gap is likely to occur between the conductor surface and the main insulation due to the complicated shape of the conductor unit. Then, a sheet-like insulating material 7 is placed on the inner layer of the main insulation 3 on the side surface of the bent portion of the conductor unit of the head 5 .

As a result, the complicated shape of the conductor unit during bending of the wire ring 4 is alleviated, and the taping properties of the mica tape are improved.

For this reason, the wire ring 4 is inserted into the core slot and the resin vacuum pressure impregnation and hardening process are performed after the winding process is completed.

At the corner part 6 and head part 5 of the wire ring 4, the surface of the conductor unit, the sheet-like insulating material 7. The retention of the impregnated resin between the mica tape layers of the main insulation 3 is improved, and the amount of leakage of the impregnated resin can be reduced.

Furthermore, since the sheet-like insulating material 7 is arranged on at least one side of the inner diameter side or the outer diameter side of the bending process of the conductor unit, as explained in the conventional example, it is not possible to wrap the conductor unit with felt. Since the conductor unit does not cover all four sides of the conductor unit, the wire ring shape can be made smaller by making the insulating layer thinner.

Furthermore, since the injection path for resin injection is shorter than when wrapping felt, resin injection can be performed more efficiently. Furthermore, since there is no gap between the surface of the conductor unit and the main insulation 3, the electrical characteristics of the electrically insulated coil are improved.

〔Effect of the invention〕

According to the present invention, it is possible to shorten the injection time of the resin that is impregnated into the main insulation part under vacuum pressure, improve the homogeneity of the insulation layer, and produce an insulated wire ring for electrical equipment with excellent electrical characteristics. can do.

[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 an enlarged view of FIG. and a sectional view of the head. 1... Conductor, 2... Insulating material, 3... Main insulation, 4...
...Electric wire ring, 5...Head, 6...Corner part, 7.
・Sheet-like insulation material. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. At the most protruding head and corner portions located outside the core of the wire ring of an electrical device installed in the slot of the iron core, on the inner diameter side of the bent portion of the wire ring and/or Or an insulated wire ring for electrical equipment, characterized in that a sheet-like insulating material is arranged on the side surface on the outer diameter side, and a main insulation mainly made of mica tape is applied on top of the sheet-like insulating material. 2. An insulated wire ring for electrical equipment according to claim 1, characterized in that the wire ring is constructed using an inorganic fiber, an organic fiber, or a sheet-like insulating material made of a combination thereof.