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Electromagnetic line classification
- Jan 11, 2018 -

Enameled wire

The conductor is coated with the corresponding paint solution, and then the solvent evaporates and the paint film solidifies and cools.

Enameled wire used according to its insulation paint can be divided into polyester, polyester imide enamelled wire, polyimide, polyamide imide enameled wire enameled wire, polyester imide/polyamide imide enamelled wire, corona resistant enameled wire, and paint, acetal paint, polyurethane enamelled wire, etc.

Sometimes it is classified according to its special purpose, such as self-adhesive enameled wire and refrigerant enameled wire.

The earliest enameled wire is oil paint covered wire, made from tung oil.

It can not be used directly to manufacture the coil and winding of the motor.

Later, polyvinyl formal enameled wire was introduced, and its mechanical properties were greatly improved. It could be used directly in the motor winding, and it was called high strength enameled wire.

With the development of the weak current technology, there is a self-adhesive enameled wire, which can not be impregnated and baked to obtain the whole better coil.

But its mechanical strength is poor, only can have micro - motor, small motor to use.

In addition, in order to avoid the trouble of removing the paint film in advance, it developed the direct welding enameled wire, and the coating film can fall off in the hot tin groove and make the copper wire easy to weld.

Because the application of enameled wire is becoming more and more extensive, the requirement is stricter, and the composite enameled wire is developed.

The inner and outer coatings are composed of different polymer materials, such as polyesteramide/polyamimide enameled wire.

Around the envelope

An important variety of winding wires.

Early use cotton yarn and silk, known as the yarn and silk covered wire, used in the motor, electrical appliances.

Due to the large insulation thickness and low heat resistance, most have been replaced by enameled wire.

Only used for high frequency winding wire.

In large and medium size winding wires, when the heat resistance level is higher and the mechanical strength is greater, the glass fiber cable is also used, and suitable adhesive paint is used when manufacturing.

The paper envelope still occupies a considerable position in the wrapping wire, which is mainly used in oil-immersed transformer.

At this time, the formation of oil paper insulation has excellent dielectric property, and low price, long life.

Paper is made up of oxygen free copper rod or electrical round aluminum rod through a certain specification of extrusion mould or annealing treatment after drawing wire, again on the copper (aluminum) conductor winding and two or more than two layers of insulation paper (including telephone paper, cable paper, high voltage cable paper, turn-to-turn insulation paper, etc.) of the winding line, used in oil-immersed transformer coil and other similar electric winding thread.

NOMEX paper is made up of oxygen free copper rod or electrical round aluminum rod through a certain specification of extrusion mould of conductor, again produced by the United States dupont NOMEX paper insulation of winding and winding line, mainly used for transformer, electric welding machine, winding magnet or other similar electrical equipment products.

The electrician bare copper (al) wire produced by extrusion process is the most ideal material for producing cable wrap.

In recent years, the film has been developed relatively rapidly, mainly with polyester film and polyimide film wrapped around the envelope.

There is also a mica belt, which is used for wind power generation.

Insulated wire

Inorganic insulating paint is usually applied when the heat resistance level requires exceeding the limit of organic material.

The existing inorganic insulation line can be further divided into glass film line, oxide film line and ceramic line.


There are combination leads, transposition wires, etc.