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Insulated wire and coil

一种绝缘电线、线圈的技术，应用在绝缘电缆、绝缘体、绝缘导体等方向，能够解决绝缘不良、介质击穿、绝缘层侵蚀等问题

Active Publication Date: 2014-04-16
PROTERIAL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the occurrence of partial discharge will not immediately show dielectric breakdown, the insulating layer will be gradually eroded by the partial discharge, which will eventually lead to dielectric breakdown and become poor insulation
That is, in the case of an insulating layer with a low PDIV, partial discharge occurs at a lower voltage, and insulation failure is likely to occur. Therefore, a high PDIV is required for the insulating layer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0035] One embodiment of the present invention will be described below.

[0036] First, the polyimide paint used for forming the polyimide resin constituting the insulating layer will be described.

[0037] 〈Polyimide coating〉

[0038] Polyimide coatings contain polyamic acid. Polyamic acid is synthesized from carboxylic acid anhydride and diamine, and has an amide bond in the molecule. This polyamic acid is polymerized by heating to become a polyimide resin having a predetermined repeating unit.

[0039] In this embodiment, the polyimide resin which has the repeating unit A in a part of molecular structure is formed from the polyimide paint containing the polyamic acid which becomes the repeating unit A by heating. This polyimide resin has a water absorption rate of 2.8% or less after 24 hours under conditions of a temperature of 40° C. and a humidity of 95%, and therefore has a low relative dielectric constant and exhibits a high partial discharge inception voltage.

[0...

Embodiment 1）

[0107] When producing an insulated electric wire, the polyimide paint used for forming the insulating layer containing a polyimide resin was prepared by the method shown below.

[0108]

[0109] First, 437.5 g of 4,4'-diaminodiphenylether (ODA) as a diamine was dissolved in 3697.2 g of N-methyl-2-pyrrolidone (NMP) as a solvent. Next, 393.2 g of pyromellitic dianhydride (PMDA) and 93.6 g of 3,3′,4,4′-biphenyltetracarboxylic dianhydride (s-BPDA) were dissolved in NMP as a solvent. Then, the polyimide coating material containing the polyamic acid A and the polyamic acid B was prepared by synthesizing, stirring at room temperature under nitrogen atmosphere for 12 hours. In addition, in order to improve the coating workability|operativity of a polyimide paint, a solvent is added to a paint, and dilution is adjusted.

[0110] In Example 1, the molar ratio of PMDA, s-BPDA and ODA was set to 85:15:103, and the polyimide resin in which the molar ratio of repeating unit A and repeati...

Embodiment 2～5）

[0131] In Examples 2-5, as shown in Table 1, the addition amount of PMDA and s-BPDA which are carboxylic acid anhydrides was changed suitably, the polyimide coating material was prepared, and the insulated electric wire was manufactured similarly to Example 1.

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Abstract

The invention relates to an insulated wire and a coil. The subject of the invention is to provide an insulated wire with an insulating layer which exhibits high partial discharge inception voltage even with a thin thickness, and a coil. The insulated wire of the invention includes a conductor and an insulating layer formed on an outer periphery of the conductor, and the insulating layer is composed essentially of a polyimide resin having a repeating unit A represented by formula (1) as a part of a molecular structure, in which a water absorption coefficient is not greater than 2.8% after 24 hours under condition at temperature of 40 DEG C and humidity of 95%. The formula (1) is as shown in the description.

Description

technical field [0001] The present invention relates to an insulated wire and a coil using the same, particularly an insulated wire and a coil used in a motor or the like. Background technique [0002] Electric devices such as motors are equipped with coils. The coils of the motor are formed using insulated wires, formed by winding the insulated wires around the core of the motor, or joining the insulated wires by welding or the like. The insulated wire has an insulating coating (insulation layer) on the outer circumference of the conductor. The insulating layer is formed by applying an insulating paint in which a resin component is dissolved in an organic solvent on a conductor and baking it. [0003] For the insulating layer, various properties such as mechanical properties and heat resistance are required. As an insulating layer satisfying these requirements, an insulating layer using a polyimide resin is known. The polyimide resin is formed by heating and imidizing p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B7/02H01B3/30
CPCH01B7/292H01B3/306Y10T428/294
Inventor 牛渡刚真本田佑树锅岛秀太菊池英行
Owner PROTERIAL LTD
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