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The Difference Between Enameled Wire and Magnet Wire

Update:29-06-2022
Summary:Enameled wire is a category of magnet wire, generally refers to the insulated wire used to make coil...

Enameled wire is a category of magnet wire, generally refers to the insulated wire used to make coils or windings in electrical products. Also called winding wire.

The magnet wire meets the requirements of a variety of applications and manufacturing processes. The former includes its shape, specification, ability to work at high temperature for short and long periods of time, as well as to withstand intense vibration in some occasions and centrifugal force at high speed, resistance to corona and breakdown under high voltage, and resistance to special atmospheres. Chemical corrosion, etc.; the latter includes the requirements of 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. Generally, it is divided into enameled wire, wrapped wire, enameled wrapped wire and inorganic insulated wire according to the insulating material and production method used in the electrical insulating layer.

The enameled wire is made by coating the conductor with the corresponding paint solution, and then by solvent evaporation and paint film curing 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 enameled wire according to the insulating paint used. 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.

The enameled wire in the early stage was an oily enameled wire made of tung oil and the like. The paint film is poor and cannot be directly used to make motor coils and windings. It needs to be wrapped with cotton yarn when using. Later, the polyvinyl formal enameled wire was introduced, and its mechanical function was greatly improved, and it could be directly used in motor windings, which was 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. 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 first during welding, the straight-soldering enameled wire is developed, and the coating film can fall by itself in the high-temperature tin enamel bath, so that the copper wire can be easily welded.

Because the application of enameled wire is becoming more and more extensive, the requirements are becoming more and more severe, 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 wires.

An important type of winding wire. In the early stage, cotton yarn and silk, 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. Now only used as high frequency winding wire. In the large and medium-sized winding wires, when the heat resistance level is high and the mechanical strength is high, the glass wire wrapped wire is also used, and the appropriate adhesive paint is used in the production.

In the wrapping wire, the paper wrapping wire still occupies a proper position, mainly used in the oil-immersed transformer. The oil-paper insulation formed at this time has excellent dielectric function, 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 is also a mica tape-coated polyesterimide film wrapped copper flat wire for wind power generation.

Inorganic insulated wire When the heat resistance level exceeds the limit of organic materials, it is generally coated with inorganic insulating paint. Existing inorganic insulating wires can be further classified into glass film wires, oxide film wires and ceramic wires.

There are also combination wires, transposed wires, etc.

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