To be enameled, a wire (also known as magnet wire) is added to the surface with paper paper-thin insulation coating. When we are winding copper wires into a coil, the copper wires are packed so tightly that they have to be enameled in order to prevent them from shorting out with each other. Enameled wire is often used for building electromagnets, inductors, transformers, motors, generators, speakers, and other applications.
Enameled wires, which often are referred to as enameled aluminum or copper wires, provide many electrical and chemical advantages and meet a variety of application and manufacturing process requirements. These include the ability to work at high temperatures, withstand intense vibration and centrifugal force at high speed, resistance to corona and breakdown under high voltage, and resistance to special atmospheres, and withstand stretching, bending, and abrasion during winding and embedding, as well as swelling and erosion during dipping and drying.
Apart from electrical insulation, the enamel also provides protection against corrosion or oxidation of the copper wire.
Enamel wire is typically made in three “grades”, with the number related to the thickness of enamel.
Grade 1 – thinnest insulation (single coating)
Grade 2 – medium insulation (double coating)
Grade 3 – thickest insulation (triple coating)
The enameled wire can be divided into polyester enameled wire, polyesterimide enameled wire, polyamideimide enameled wire, polyimide enameled wire, polyesterimide/polyamideimide enameled wire, corona-resistant enameled wire, and oily enameled wire according to the insulating paint used.