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Insulated wire

A technology for insulated wires and insulating coatings, which is applied to insulated cables, insulators, insulated conductors, etc., and can solve problems such as erosion and degradation of insulating coatings and coil insulation breakdown

Inactive Publication Date: 2012-09-19
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a problem that partial discharge causes corrosion and deterioration of the insulation coating (partial discharge deterioration), and if partial discharge deterioration progresses, it will eventually lead to insulation breakdown of the coil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] (Manufacturing of the insulated wire of Example 1)

[0073] On a copper wire having a conductor diameter of 0.8 mm, coating and firing were repeated by a conventional method using insulating paint B to form a second insulating coating (thickness: 0.040 mm). Then, the insulating paint A is directly used on the second insulating film, and the coating and firing are repeated according to the conventional method to form the first insulating film (thickness: 0.040 mm), thereby producing figure 1 An insulated wire as shown (Example 1). In addition, the dimensions such as the film thickness were measured by observing the cross-section of the produced insulated wire (the same applies hereinafter).

Embodiment 2

[0074] (Production of insulated wire of Example 2)

[0075] On a copper wire having a conductor diameter of 0.8 mm, the insulating paint B was repeatedly applied and baked by a conventional method to form a second insulating film (thickness: 0.010 mm). Then, the insulating paint A is directly used on the second insulating film, and the coating and firing are repeated according to the conventional method to form the first insulating film (thickness: 0.070 mm), thereby producing figure 1 An insulated wire as shown (Example 2).

Embodiment 3

[0076] (Manufacture of the insulated wire of Example 3)

[0077] On a copper wire having a conductor diameter of 0.8 mm, coating and firing were repeated by a conventional method using insulating paint B to form a second insulating coating (thickness: 0.070 mm). Then, the insulating coating material A is directly used on the second insulating film and repeatedly applied and baked by the conventional method to form the first insulating film (thickness: 0.010 mm), thereby producing figure 1 An insulated wire as shown (Example 3).

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Abstract

It is an objective of the present invention to provide an insulated wire having partial discharge resistance comparable to or higher than those of conventional insulated wires even in unstable operating environments. There is provided an insulated wire including: plural layers of insulation coating insulation wires are formed around the conductor, the plural layers of insulation coating are provided with at least two layers, the two layers are a first insulation coating provided with inorganic fine particles dispersed therein and a second insulation coating formed at the inner side of the first insulation coating and with a relative dielectric constant of the second insulation coating being lower than that of the first insulation coating.

Description

technical field [0001] The present invention relates to an insulated wire having an insulating coating formed by coating and firing an insulating paint on the outer periphery of a metal conductor, and particularly relates to an insulated wire suitable for coils of electrical equipment such as motors and transformers. Background technique [0002] Insulated electric wires (so-called enameled wires) are widely used as electric wires for coils of electrical equipment such as motors and transformers, and have metal conductors formed in a cross-sectional shape (for example, circular, approximately rectangular) in accordance with the purpose and shape of the coil. A single-layer or multi-layer insulating coating is formed. Usually, the insulating film is produced by applying and baking an insulating paint obtained by dissolving a resin (for example, polyimide, polyamideimide, polyesterimide, etc.) in an organic solvent on a metal conductor. [0003] In recent years, since electri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B7/02
CPCH01B7/02H01B3/305H01B7/0291C08K3/36
Inventor 本田佑树阿部富也锅岛秀太菊池英行
Owner HITACHI METALS LTD