JPS6154837A - Method of fixing coil end - Google Patents

Abstract

PURPOSE:To increase cooling capacity by placing spacer having ventilation path at peripheral portion of upper coils beneath the binding wire or between the coils. CONSTITUTION:At first, a spacer 10, whose width is equal or slightly larger than that of the binding wire 5 at the place where the wire 5 lays, is inserted between the upper and lower coils and both are connected together. The spacer 11 is then inserted between the upper coils, and finally a spacer 12 is placed between wire 5 and the upper coil 3 to wind the binder round them. A corrugated ventilation path 13 is formed with the spacers 10, 11 and 12 on the face that is contacting with a rotor coil insulator 9. In this manner, cooling effect can also be obtained at the lower insulator beneath the binding wire, which is approximately the same as that of other portion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for fixing a coil end of a rotor winding of a rotating electric machine.

[Technical background of the invention and its problems]

Conventionally, as a method for fixing the rotor coil of a rotating electric machine, as shown in FIG.
After fixing the inside of the core with Vc, a so-called Grigreg-shaped bind wire 5 treated with epoxy resin, polyester resin, or other highly heat-resistant resin is wound around the outer periphery of the coil end with a constant tension the required number of times. When winding the bind wire 5, as shown in FIGS. 3 and 4, between the bind wire and the coil and between adjacent upper coils 3,
Binding underlay 6, upper and lower coil spacers 7, respectively.
Further, spacers 8 are inserted between the coils to prevent deformation of the coils when the binding wire 5 is applied with a constant tension, and to hold down the rotating coils by fixing them with these spacers. Since the spacers used here are insulating, they have poor thermal conductivity and increasing the number and size of spacers is difficult.
This significantly impedes cooling performance at the coil end, causes a local temperature rise at the spacer insertion position, and may lead to dielectric breakdown due to thermal deterioration of the insulator.

[Purpose of the invention]

The present invention has been devised to address these problems, and an object of the present invention is to provide a coil end fixing method that improves the cooling effect.

[Summary of the invention]

In the present invention, by providing a ventilation passage in the binding underlay or the spacer provided between the coils, cooling air is passed through the fixing portion to improve the cooling effect.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 1 and 2. First, a spacer 10 having a width equal to or slightly larger than the bind wire is inserted between the upper and lower coils to the RVC so that the bind wire 5 hangs at the coil end of the rotor coil, and the upper and lower coils are connected. Next, a spacer 11 is inserted between the upper coils 3, and finally a spacer 12 is placed between the bind wire 5 and the upper coil 3, and the bind wire is wound around the outer circumference of the spacer 12.

The spacers 10, 11, and 12 are provided with uneven ventilation passages 13 on their surfaces in contact with the rotor coil insulating layer 9. As the material of this spacer, a material having good adhesion to the rotor coil insulating layer 9 and the impregnated resin material, for example, an epoxy resin product is used if the material is an epoxy-based material. moreover,
By selecting the thickness and spacing of the spacer, it is possible to prevent the ventilation passage from being closed by the impregnated resin in the subsequent process.

By doing the above, a ventilation passage 13 is formed between the binding wire 5 and the rotor coil insulating layer 9 and between the rotor coil insulation layers 9, and cooling air can pass through this ventilation passage 13, so that the lower side of the binding wire Even in the insulating layer, a cooling effect similar to that of other parts can be obtained. Therefore, it is possible to prevent critical damage that would develop into dielectric breakdown due to localized thermal deterioration of the insulator, and to maintain high reliability. It is possible to provide a rotating electric machine having the following.

〔Effect of the invention〕

As explained above, in the coil end fixing method of the present invention, a spacer with a ventilation passage is provided around the outer circumference of the upper coil under the bind or between the coils, so that air can flow under the bind and between the coils. Improves cooling performance.

[Brief explanation of drawings]

1 and 2 are cross-sectional views showing a coil end of a rotating electric machine manufactured by an embodiment of the method of the present invention, FIG. 3 is a cross-sectional view showing a coil end of a rotating electric machine manufactured by a conventional method, and FIG. FIG. 4 is a view taken along arrow ff-IV in FIG. 3. 3...Top coil, 4...Bottom coil, 5...
Binding wire, 9... Insulating layer, 10.11.12
...Spacer, 13...Ventilation duct. Agent Patent Attorney Kensuke Chika (and 1 other person) No.
1 Figure 2

Claims (1)

[Claims] It is recommended that a spacer with a ventilation passage be provided on the outer periphery of the upper coil at the end of the coil of the rotating electrical machine below the binding line, or at least in one area between the upper coils or between the upper coil and the lower coil. Features a coil end fixing method.