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Laminate of conductor and insulating film, coil, rotating electrical machine, insulating coating, and insulating film

A technology of insulating film and laminated body, which is applied to insulators, insulating cables, conductors, etc., can solve the problems of electronic equipment damage, insulation damage, insulation film deterioration, etc., and achieve the effect of excellent partial discharge resistance characteristics.

Pending Publication Date: 2021-04-09
SUMITOMO SEIKA CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a problem that the insulating film is deteriorated due to such partial discharge, and the insulation breakdown of the coil is caused at an early stage, and the electronic equipment is damaged.
[0004] In addition, in recent years, in systems that drive motors, etc., by inverters used for energy saving and variable speeds, even in devices classified as low-voltage drives, the driving voltage is repeatedly generated in extreme times. In terms of sudden overvoltage (so-called inverter surge), there are more cases of insulation damage
This insulation breakdown is caused by partial discharges caused by repeated overvoltages caused by inverter surges

Method used

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  • Laminate of conductor and insulating film, coil, rotating electrical machine, insulating coating, and insulating film
  • Laminate of conductor and insulating film, coil, rotating electrical machine, insulating coating, and insulating film
  • Laminate of conductor and insulating film, coil, rotating electrical machine, insulating coating, and insulating film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0086] Hereinafter, the present invention will be further specifically described by way of examples.

[0087] (polyimide coating 1)

manufacture example 1

[0089] 400.8 g of 4,4'- diamino diphenyl ether and 4109 g of NMP were put into the 10-L 4-neck flask equipped with the stirrer and the thermometer, and it heated up to 40 degreeC, stirring in nitrogen, and dissolved it. Next, 220.0 g of pyromellitic anhydride and 279.5 g of biphenyltetracarboxylic dianhydride were gradually added to the solution. It stirred for 1 hour after completion|finish of addition, and obtained the polyimide coating material which melt|dissolved the aromatic polyamic acid represented by following formula (I) at the density|concentration of 18.0 mass %. In addition, in the following formula (I), n is an integer of 2 or more.

[0090] [chemical 1]

[0091]

[0092] (polyimide coating 2)

manufacture example 2

[0094] 400.5 g of 4,4'- diamino diphenyl ether and 3780 g of NMP were put into the 10-L 4-necked flask equipped with a stirrer and a thermometer, and it heated up to 40 degreeC, stirring in nitrogen, and dissolved it. Next, 425.2 g of pyromellitic anhydride was gradually added to the solution. It stirred for 1 hour after completion|finish of addition, and obtained the polyimide paint which melt|dissolved the aromatic polyamic acid represented by following formula (II) at the density|concentration of 17.9 mass %. In addition, in the following formula (II), n is an integer of 2 or more.

[0095] [Chem 2]

[0096]

[0097] (polyimide coating 3)

[0098] UPIA (registered trademark)-AT (U-varnish-A) manufactured by Ube Industries, Ltd. was used. This is a polyimide paint containing an aromatic polyamic acid obtained by reacting 4,4'-diaminodiphenyl ether and biphenyltetracarboxylic dianhydride.

[0099] (polyamideimide coating)

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Abstract

Provided is a laminate having excellent partial discharge resistance. This laminate of a conductor and an insulating film comprises a conductor and an insulating film formed on the conductor, wherein: the insulating film is made of a resin composition including a metal oxide hydrate; and when the laminate is subjected to partial discharge resulting from an inverter surge, an inorganic insulating layer is formed in the insulating film.

Description

technical field [0001] The present invention relates to a laminated body of a conductor and an insulating film, a coil, a rotating electrical machine, an insulating paint, and an insulating film. Background technique [0002] Electric wires used in electronic equipment such as motors can be formed by applying insulating paint obtained by dissolving resins such as polyimide and polyamideimide or resin precursors in organic solvents, and then firing them on the surface of conductors. An insulated wire with an insulating layer; an insulated wire with an insulating layer formed by winding an insulating film such as polyimide film or mica tape on a conductor (so-called tape packaging). [0003] In electronic devices with high operating voltage, such as motors used under high voltage, if a high voltage is applied to the insulated wires constituting the coil and there are small gaps between adjacent insulated wires or in the insulating coating, sometimes the Partial discharge occu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F5/06H01B7/02H01F5/00
CPCH01F5/06H01B3/306C08K2003/2227C09D179/08C09D7/61C08K3/22C08L79/08H01B7/02H01F27/2823H01B3/302H01B3/308H01B3/421H01B7/0216
Inventor 林坂德之坂东诚二菊池英行
Owner SUMITOMO SEIKA CHEM CO LTD
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