The Application of Enameled Wire is Becoming More and More Comm
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With the development of technology, there has been a self-adhesive enameled wire . Self-adhesive enameled wires can be obtained without impregnation, baking and better integrity of the coil. However, the mechanical strength of the self-adhesive enameled wire is poor and can only be used in micro-motors and small motors. In addition, in order to avoid the trouble of removing the paint film first when welding, a straight soldering enameled wire was developed, and the coating film could be detached in the high-temperature solder bath to make the copper wire easy to solder.
The enameled wire is coated with a corresponding lacquer solution on the outside of the conductor, and is then made by solvent volatilization and curing and cooling of the paint film. The earliest enameled wire was an oil-based enameled wire made from tung oil. The paint film has poor abrasion resistance and cannot be used directly for the manufacture of motor coils and windings. It must be wrapped with cotton yarn during use. Later, the advent of polyvinyl formalin enameled wire, its mechanical properties greatly improved, can be directly used for motor windings, and called high strength enameled wire.
As the application of enameled wire has become increasingly widespread and increasingly stringent, composite enameled wire has also been developed. Its inner and outer paint films are composed of different polymer materials, such as polyesterimide enameled wire.
One of the important varieties in the wrapping wire winding. In the early days, cotton yarns and silk yarns, known as yarn wrapping and silk wrapping, were used in motors and electrical appliances. Due to the large insulation thickness and low heat resistance, most have been replaced by enameled wires. Currently only used as high frequency winding wire. In the winding wires of large and medium specifications, when the heat-resistant grade is high and the mechanical strength is large, a glass-wire coated wire is also used, and an appropriate adhesive paint is used in the manufacture.
In the wrapping line, the wrapping line still occupies a considerable position, mainly used in oil-immersed transformers. The oil-paper insulation formed at this time has excellent dielectric properties, and is inexpensive and has a long life. In recent years, the development of relatively fast is the film around the envelope, mainly polyester film and polyimide film around the envelope. Inorganic Insulating Wires When inorganic heat-resistant grades exceed the limits of organic materials, they are usually coated with inorganic insulating lacquers. Existing inorganic insulated wires can be further classified into glass film wires, oxide film wires, and ceramic wires.
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