What is aluminum core electromagnetic wire?
As the name suggests, the core electromagnetic wire refers to the electromagnetic wire with aluminum as the core. The electromagnetic wire is used to manufacture the insulated wire of coil or winding in electrical products. Also known as winding wire. The electromagnetic wire must meet the requirements of various use and manufacturing processes. The former includes its shape, specification, short-term and long-term work at high temperature, strong vibration in some occasions and centrifugal force at high speed, corona and breakdown resistance under high voltage, chemical corrosion resistance under special atmosphere, etc; The latter includes the requirements of tension, bending and wear during winding and embedding, as well as swelling and erosion during impregnation and drying.
Aluminum core electromagnetic wires can be classified according to their basic composition, conductive core and electrical insulation layer. Generally, it is divided into aluminum core enamelled wire, aluminum core wound wire, aluminum core enamelled wire and inorganic insulated wire according to the insulating material and manufacturing method used in the electrical insulation layer.
Enamelled wire of aluminum core electromagnetic wire: it is made by coating the conductor with corresponding paint solution, and then volatilizing the solvent, curing and cooling the paint film. Enamelled wire can be divided into polyester enamelled wire, polyester sub * * * enamelled wire, polyacyl * * * sub * * * enamelled wire, polyacyl * * * enamelled wire, polyester sub * * * / polyacyl * * * acyl * * * enamelled wire, corona resistant enamelled wire, oily paint, acetal paint, polyurethane enamelled wire, etc. Sometimes it is classified according to the particularity of its use, such as self-adhesive enamelled wire, refrigerant resistant enamelled wire, etc.
***The enamelled wire of the early electromagnetic wire was oily enamelled wire, which was made of tung oil. The paint film has poor wear resistance and can not be directly used to manufacture motor coils and windings. Cotton yarn wrapping layer should be added when using. Later, polyvinyl formal enamelled wire came out, and its mechanical properties were greatly improved. It can be directly used in motor windings, which is called high-strength enamelled wire.
With the development of weak current technology, self-adhesive enamelled wire has emerged, which can obtain better integrity coils without impregnation and baking. However, its mechanical strength is poor, and * * * can be used in micro and special motors and small motors. In addition, in order to avoid the trouble of removing the paint film first during welding, the direct welding enamelled wire is developed, and its film can fall off automatically in the high-temperature tin lined tank, making the copper wire easy to weld.
Winding of electromagnetic wire: an important variety of winding wire. In the early days, cotton yarn and silk were used in motors and electrical appliances. Due to the large insulation thickness and low heat resistance, most of them have been replaced by enamelled wires. At present * * * is used as high-frequency winding wire. In large and medium-sized winding wires, when the heat resistance grade is high and the mechanical strength is large, glass wire wrapped wire is also used, and appropriate adhesive paint is matched during manufacturing.
Paper wrapped wire still occupies a considerable position in winding wire, which is mainly used in oil immersed transformer. The oil paper insulation formed at this time has excellent dielectric properties, low price and long service life. In recent years, film wrapping wire has developed rapidly, mainly including polyester film and polyimide film wrapping wire. Recently, there are mica tape wrapped polyester sub * * * film wrapped copper flat wires for wind power generation.
Inorganic insulated wire of aluminum core electromagnetic wire: when the heat resistance grade requirements exceed the limit of organic materials, it is usually coated with inorganic insulating paint. The existing inorganic insulating wires can be further divided into glass film wires, oxide film wires and ceramic wires. There are also combination wires, transposition wires, etc.
Due to the increasingly wide application and strict requirements of enamelled wire of aluminum core electromagnetic wire, composite enamelled wire has also been developed. The inner and outer paint films are composed of different polymer materials, such as polyester * * * / poly * * * acyl * * * enamelled wire. Therefore, aluminum core electromagnetic wire is more and more used in various related industries, and the industrial status of aluminum core electromagnetic wire has been irreplaceable.