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The first is oily enameled wire
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zihuanew
Posted 2015-09-06 11:25 PM (#213502)
Subject: The first is oily enameled wire


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The first is oily enameled wire, made of tung oil. Its poor wear resistance film can not be directly used in the manufacture coils and motor windings need to add cotton yarn wrapped layer when in use. Later polyvinylformal wire come out, greatly improved its mechanical properties, can be used directly in the motor windings, and referred to as high strength wire.
With the development of technology and the emergence of weak self-adhesive enameled wire, you can not impregnated, baked to obtain a better overall coil. But its mechanical strength is poor, only have micro-motor, small motors are used. In addition, in order to avoid trouble in advance to remove the film during welding, the development of solderable enameled copper wires whose coating can come off leaving their own in the lining of tin bath temperature easily welded.
Due to the increasingly widespread application of enameled wire, increasingly stringent requirements, but also the development of the composite wire. Its inner and outer film by a different polymer material, e.g., polyester-imide / polyamide-imide enameled wire.
Envelope winding wire around an important species. Early use of cotton and silk yarn called envelope and silk envelope, once used in motors, appliances. Due to the large thickness of the insulation, heat resistance is low, the majority has been replaced by wire. At present only as a high-frequency winding wires. In large, medium-sized winding wire specification, when high heat levels and greater mechanical strength, also used glass envelope, and in the manufacture of adhesive with appropriate paint.
In the line wrapped around the envelope in still occupied a certain position, mainly for oil-immersed transformers. At this form of oil-paper insulation with excellent dielectric properties, and low prices, long life.
Relatively rapid development in recent years is the film around the envelope, there are a polyester film and polyimide film around the envelope.
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