Magnet wire, also known as winding wire, is an insulated wire used to manufacture coils or windings in electrical products. Magnet wire is usually divided into enameled wire, winding wire, enameled winding wire and inorganic insulated wire. Introduction Magnet wire is an insulated wire used to manufacture coils or windings in electrical products. Also called winding wire. Magnet wires must meet the requirements of a variety of uses and manufacturing processes. The former includes its shape, specification, ability to work at high temperatures for short and long periods of time, as well as withstanding strong vibration and centrifugal force at high speeds in some occasions, resistance to corona and breakdown under high voltage, and resistance to chemicals in special atmospheres Corrosion, etc.; the latter includes requirements for stretching, bending and abrasion during winding and embedding, as well as swelling and erosion during dipping and drying. Magnet wires can be classified according to their basic composition, conductive core and electrical insulation layer. Generally, it is divided into enameled wire, winding wire, enameled wire and inorganic insulated wire according to the insulating material and manufacturing method used in the electrical insulation layer. The classified enameled wire is coated with a corresponding lacquer solution on the outside of the conductor, and then it is made by solvent volatilization and solidification and cooling of the lacquer film. 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 varnish used. Lacquer, 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. The earliest enameled wire was oily enameled wire, made of tung oil. The paint film has poor abrasion resistance and cannot be directly used to make motor coils and windings. It needs to be covered with cotton yarn when used. Later, polyvinyl formal enameled wire came out, and its mechanical properties were greatly improved. It can be directly used in motor windings and is called high-strength enameled wire. With the development of weak current technology, self-adhesive enameled wires have appeared, which can obtain coils with better integrity without dipping and baking. But its mechanical strength is poor, and it can only be used in micro motors and small motors. Copper enameled wire made in China  In addition, in order to avoid the trouble of first removing the paint film during soldering, direct soldering enameled wire has been developed. The paint film can fall off in the high-temperature tin enamel tank to make the copper wire easy to solder. As the application of enameled wire is becoming more and more extensive, the requirements are becoming stricter, and composite enameled wire has also been developed. The inner and outer paint films are composed of different polymer materials, such as polyesterimide/polyamideimide enameled wire. An important variety in the winding wire of the covered 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, most of them have been replaced by enameled wires. It is currently only used as a high-frequency winding wire. In the large and medium-sized winding wires, when the heat resistance level is higher and the mechanical strength is higher, glass fiber covered wires are also used, and they are made with appropriate adhesive paint. 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, is low in price, and has a long life. Paper covered wire is an annealed wire made of oxygen-free copper rods or electrical round aluminum rods extruded or drawn by a certain specification die, and then wrapped two or more layers of insulating paper on the copper (aluminum) conductor (including Telephone paper, cable paper, high-voltage cable paper, inter-turn insulation paper, etc.) winding wires, suitable for oil-immersed transformer coils and other similar electrical winding wires. NOMEX paper-covered wire is a winding wire made of oxygen-free copper rods or electrical round aluminum rods extruded by a certain specification die, and then wrapped by NOMEX insulating paper produced by DuPont. It is mainly used for transformers and electric welding machines. , Electromagnet or other similar electrical equipment product winding. Electrician bare copper (aluminum) wire produced by extrusion process is the most ideal material for the production of cable paper-covered wire. In recent years, the relatively rapid development is the film wrapping wire, mainly polyester film and polyimide film wrapping wire. Recently, there is also a mica tape-coated polyesterimide film-coated rectangular copper wire used for wind power generation. Insulated wires are usually coated with inorganic insulating varnish when the heat resistance rating exceeds the limit of organic materials. The existing inorganic insulated wires can be further divided into glass film wires, oxide film wires and ceramic wires. There are also combined wires, transposed wires and so on.

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