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The difference between enameled wire and electromagnetic wire

The level of enameled wire refers to the use of Chinese Pinyin (or Latin) English letters and one or more numbers to represent different shapes and types of profiles and products such as carbide.

Representation method of enameled wire level:

1. Symbol + code:

(1) Series code: Enameled winding into: Q paper wrapped winding wire: Z

(2) Conductor material: Copper conductor: T (omitted) Aluminum conductor: L

(3) Insulation material: Y, A polyamide (pure nylon)

(4) Characteristics of conductor: flat wire: B round wire: Y (omitted) hollow wire: K

(5) Paint film thickness: round line: thin paint film-1 thick paint film-2 thick paint film-3 flat wire: ordinary paint film-1 thick paint film-2

(6) The heat level is indicated by / XXX.

2. Enamelled wire level: Enameled wire product models are named using a combination of Chinese Pinyin letters and Arabic numerals. Its composition includes the following parts. Combining the above parts in order is the product model of the enameled wire.

Enameled wire belongs to a category of electromagnetic wires, and generally refers to insulated wires used to make coils or windings in electrical products. Also called winding wire.

Electromagnetic wires must meet a variety of use and manufacturing process requirements. The former includes its shape, specifications, can work under high temperature for a short time and long time, and withstand strong vibration and centrifugal force at high speed in some occasions, resistance to corona and breakdown under high voltage, and chemical resistance under special atmosphere Corrosion, etc .; the latter includes the requirements of being subjected to stretching, bending and abrasion when winding and embedding, as well as swelling and erosion during dipping and drying.

Electromagnetic wires can be classified according to their basic composition, conductive cores and electrical insulation layers. Generally, it is divided into enameled wire, wound wire, enameled wire and inorganic insulated wire according to the insulating material and manufacturing method used for the electric insulating layer.

Enameled wire The conductor is coated with the corresponding lacquer solution, and then made by solvent volatilization and lacquer film solidification and cooling. Enameled wire can be divided into polyester enameled wire, polyesterimide enameled wire, polyamideimide enameled wire, polyimide enameled wire, polyesterimide / polyamidoimide enameled wire, corona-resistant enameled wire, and oil-based 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.

Early enameled wire was oily enameled wire, made of tung oil, etc. The paint film has poor abrasion resistance and cannot be directly used for manufacturing motor coils and windings. A cotton yarn wrapping layer is required when used. Later, polyvinyl formal enameled wire came out, and its mechanical properties have been greatly improved. It can be directly used for motor windings, and is called high-strength enameled wire.

With the development of weak current technology, self-adhesive enameled wires have emerged, and coils with better integrity can be obtained without dipping and baking. However, its mechanical strength is poor, and it can only be used in micro and small motors. In addition, in order to avoid the trouble of removing the paint film before soldering, a direct-soldering enameled wire has been developed, and the coating film can fall off by itself in a high-temperature tin bath to make copper wires easy to weld.

As the application of enameled wires is becoming more and more widespread, the requirements are becoming stricter, and composite enameled wires have 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 winding wire. Early cotton yarn and silk, known as yarn covered wire and silk covered wire, were used in motors and electrical appliances. Due to the large insulation thickness and low heat resistance,  of them have been replaced by enameled wires. Currently only used as high frequency winding wires. In large and medium-sized winding wires, when the heat resistance is high and the mechanical strength is large, glass-fiber covered wires are also used, and appropriate adhesive varnishes are used during manufacture.

Paper-covered wire still occupies a considerable position in the wrapped wire, mainly used in oil-immersed transformers. The oil-paper insulation formed at this time has excellent dielectric properties, is inexpensive, and has a long life.

In recent years, the rapid development of film wrapping wire, mainly polyester film and polyimide film wrapping wire.

Recently, there is also a mica tape wrapped polyester-imide film wrapped copper flat wire for wind power generation.

Inorganic insulated wire When the requirement of heat resistance exceeds the limit of organic materials, it is usually coated with inorganic insulating paint. The existing inorganic insulated wires can be further divided into glass film wires, oxide film wires, and ceramic wires.

Combined wires, transposed wires, etc.