What is enameled wire?
Release Date:
2023-02-22
It is manufactured by coating the conductor with a suitable varnish solution, followed by solvent evaporation, varnish film curing, and cooling. Enamelled wires can be classified according to the insulating varnish used into polyester enamelled wire, polyester-imide enamelled wire, polyamide-imide enamelled wire, polyimide enamelled wire, polyester-imide/polyamide-imide enamelled wire, corona-resistant enamelled wire, as well as oil-based varnish wire, acetal varnish wire, polyurethane enamelled wire, and others. In some cases, they are also categorized based on specific applications, such as self-bonding enamelled wire and refrigerant-resistant enamelled wire.
It is manufactured by coating the conductor with a suitable varnish solution, followed by solvent evaporation, varnish film curing, and cooling. Enamelled wire can be classified according to the insulating varnish used into polyester enamelled wire, polyester-imide enamelled wire, polyamide-imide enamelled wire, polyimide enamelled wire, polyester-imide/polyamide-imide enamelled wire, corona-resistant enamelled wire, as well as oil-based varnish wire, acetal varnish wire, polyurethane enamelled wire, and others. Occasionally, it is also categorized based on specific applications, such as self-bonding enamelled wire and refrigerant-resistant enamelled wire.
Early enameled wire was oil-based, made from tung oil and similar materials. Its enamel coating had poor abrasion resistance and could not be used directly for manufacturing motor coils and windings; it required an additional layer of cotton yarn wrapping before use. Later, polyvinyl alcohol–formaldehyde enameled wire was developed, which exhibited significantly improved mechanical properties and could be used directly in motor windings, hence the name “high-strength enameled wire.”
With the advancement of low-voltage electrical technology, self-adhesive enameled wire has emerged, enabling the formation of coils with superior integrity without the need for impregnation or baking. However, its mechanical strength is relatively poor, limiting its application to micro and small motors. In addition, to eliminate the hassle of pre-removing the enamel coating prior to soldering, direct-solderable enameled wire has been developed; its coating can spontaneously detach in a high-temperature tinning bath, thereby facilitating easy soldering of the copper conductor.
With the increasingly widespread application of enameled wire and ever-stricter performance requirements, composite enameled wires have been developed. These wires feature inner and outer enamel coatings made from different polymeric materials, such as polyester-imide/polyamide-imide enameled wire.
Nantong Zhihe Electric Co., Ltd.
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