Aluminum Magnet Wire can be classified according to their basic composition, conductive core and electrical insulation. Generally, it is divided into an aluminum core enameled wire, an aluminum core wrapped wire, an aluminum core enamel wrapped wire and an inorganic insulated wire according to the insulating material and the manufacturing method used for the electrical insulating layer. Enameled wire of aluminum magnet wire: It is made by coating the corresponding paint solution on the outside of the conductor and then volatilizing the solvent and curing and cooling the paint film. The enameled wire can be divided into polyester enameled wire (PEW), polyester imide enameled wire (EIW), polyamide imide enameled wire (AIW), polyimide enameled wire, polyester imide/polyamideimide according to the insulating paint used. Enameled wire (EIAIW), corona-resistant enameled wire, and oil paint, acetal paint, polyurethane enameled wire, etc. Sometimes classified according to the specificity of their use, such as self-adhesive enameled wire, anti-freeze enameled wire.
The earliest electromagnetic wire enameled wire is an oily enameled wire made of tung oil. The paint film has poor wear resistance and cannot be directly used for manufacturing motor coils and windings. When used, it is necessary to add a cotton yarn wrap layer. Later, the polyvinyl alcohol-formal enameled wire was introduced, and its mechanical properties were greatly improved. It can be directly used for motor windings, and it is called high-strength enameled wire.
With the development of weak current technology, a self-adhesive enameled wire has appeared, which can obtain a better overall coil without immersion and baking. However, its mechanical strength is poor, and it can only be used in micro motors and small motors. In addition, in order to avoid the trouble of removing the paint film at the time of soldering, a straight solderable enameled wire has been developed, and the coating film can be detached by itself in a high-temperature tin-plated bath to make the copper wire easy to solder.
Wrapped wire of electromagnetic wire: An important variety in the winding wire. Early use of cotton yarn and silk, known as yarn wrapped wire and wire wrapped wire, was used in motors and electrical appliances. Due to the large thickness of the insulation and low heat resistance, most have been replaced by enameled wires. Currently only used as a high frequency winding wire. In the large and medium-sized winding wires, when the heat resistance level is high and the mechanical strength is large, the glass fiber covered wire is also used, and the appropriate adhesive paint is used in the manufacture.
In the wrapped wire, the paper covered wire still occupies a considerable position, mainly used in oil-immersed transformers. The oil-paper insulation formed at this time has excellent dielectric properties, and is inexpensive and has a long life. In recent years, the film has been developed more rapidly, mainly including polyester film and polyimide film wrapping. Recently, there are also mica tape-packed polyesterimide film wrapped copper wire for wind power generation.