The cable insulation material electromagnetic wire is n […]
The cable insulation material electromagnetic wire is necessary to meet the needs of various application and production skills. The former includes its shape, standard, ability to operate at high temperatures for short and long periods of time, as well as accept severe vibrations and centrifugal forces at high speeds in certain occasions, withstand corona and breakdown at high voltages, and under special electric wire atmospheres Chemical resistance, etc.; the latter includes the need to be stretched, tortuous and worn during winding and embedding, as well as swelling and erosion during dipping and drying. Electromagnetic wire can be classified according to its substrate structure, conductive core and electrical insulation layer.
Generally, it is divided into enameled wire, wrapped wire, enameled wound wire and inorganic insulated wire according to the insulating materials and manufacturing methods used for the electrical insulating layer. The conductor is coated with the corresponding paint solution, and then made by solvent evaporation and curing and cooling of the paint film. The enameled wire can be divided into red polyester enameled wire, polyester imine enameled wire, polyamide imine enameled wire, polyimide enameled wire, polyester imine/polyamide imide enameled wire, corona resistant enameled wire, and oily Paint, acetal paint, polyurethane enameled wire.
Sometimes it is also classified according to the particularity of its use, such as self-adhesive enameled wire and refrigerant-resistant enameled wire. Wrapped wire An important type of winding wire. The cotton yarn and silk used in the early stage, called yarn covered wire and silk covered wire, were used in motors and electrical appliances. Because of the large insulation thickness and low heat resistance, most of them have been replaced by enameled wires. At that time, it was only used as a high-frequency winding wire. In the large and medium-sized standard winding wire, when the heat resistance level is high and the mechanical strength is large, the glass fiber covered wire is also used, and it is equipped with an appropriate adhesive lacquer during production.
In the wrapped wire, the paper covered wire still occupies the proper position, and the electric wire is mainly used in the oil-immersed transformer. The oil-paper insulation formed at this time has excellent dielectric function, low price and long life. In recent years, it has been opened for comparison with film winding, mainly including polyester film and polyimide film winding. When the heat resistance level needs to exceed the limit of organic materials, inorganic insulating paint is generally used to coat electrical wires. Existing inorganic insulated wires can be further divided into glass film wires, oxide film wires and ceramic wires.