There are two main types of magnet wire: enameled wire and wrapped wire. Enameled wire is made by coating insulating varnish on bare copper wire. The insulating layer is thin and the volume is small. It is widely used in various electrical appliances and instruments. The performance of enameled wire varies with the nature of the insulating material used.
Wrapped wires mainly include yarn covered wire, silk covered wire, glass fiber covered wire, paper covered wire and plastic film covered wire. Among them, yarn covered wire and silk covered wire may be eliminated due to poor temperature resistance and large occupied volume. Glass fiber covered wire is a round copper wire wrapped with glass fiber and impregnated with silicone resin. It can withstand a high temperature of 180°C and has good insulation properties and mechanical strength. Paper covered wire is mainly used for oil-immersed transformers.
The plastic film covered wire is made of polyimide film coated with a certain adhesive and wrapped on the conductor by baking. Its insulating layer is tough and elastic, easy to wind, wear-resistant and heat-resistant, and is widely used in astronautics and other equipment. Insulated wires generally consist of a conductive core, an insulating layer and a protective layer. The core can be divided into four configurations: hard, soft, mobile and extra soft according to the requirements of use. There are four cores: single core, two core, three core and four core. The insulating layer is generally made of rubber, plastic, etc. This type of insulated wire is widely used in various instruments and meters, telecommunications equipment, power lines and lighting lines with an AC voltage below 500 volts and a DC voltage below 1000 volts.
