Basic composition and manufacturing method of magnet wire

Magnet wires can be classified according to their basic composition, conductive core and electrical insulation. Generally, it is divided into enameled wire, wound wire, enameled wire and inorganic insulated wire according to the insulating material and manufacturing method used in the electrical insulating layer.

Enameled wire: coated with corresponding lacquer solution on the outside of the conductor, and then made by solvent volatilization and paint film solidification and cooling. 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 Paint, acetal paint, polyurethane enameled wire, etc. Sometimes it is also classified according to the particularity of its use, such as self-adhesive enameled wire, refrigerant resistant enameled wire, etc.

Wrapped wire: an important variety in winding wire. In the early days, cotton yarn and silk, called yarn covered wire and silk covered wire, were used in motors and electrical appliances. Due to the large insulation thickness and low heat resistance,  of them have been replaced by enameled wires. Currently only used as high-frequency winding wire. In the large and medium-sized winding wires, when the heat resistance grade is higher and the mechanical strength is higher, the glass fiber covered wire is also used, and the appropriate adhesive paint is used in the manufacture. Paper-covered wire still occupies a considerable position in the wrapped wire, which is mainly used in oil-immersed transformers. The oil-paper insulation formed at this time has excellent dielectric properties, low price, and long life.

In recent years, the rapid development is the film wrapping wire, mainly polyester film and polyimide film wrapping wire.

Inorganic insulated wire: When the heat resistance level exceeds the limit of organic materials, inorganic insulating paint is usually used. The existing inorganic insulated wires can be further divided into glass film wires, oxide film wires and ceramic wires.