Introduction to the
Electromagnetic wire (magnetwire) is used to manufacture electrical products in the coil or insulated wire winding. Also known as the winding line. Electromagnetic wire must meet the requirements of multiple USES and manufacturing processes. Including its shape, specification, the former can short-term and long-term work under high temperature, and on some occasions, under the strong vibration and high speed centrifugal force under high voltage tolerance corona breakdown, and under the special atmosphere of resistance to chemical corrosion, etc.; Which includes winding and subjected to tensile, bending and wear when embedding, and dipping and drying process of swelling, erosion, etc.
Electromagnetic wire can be according to its basic components, conductive line heart and electrical insulation classification. Usually based on electrical insulation used in the insulation materials and manufacturing methods are divided into enameled wire, round and the envelope, enameled round mineral insulated wire.
Outside the conductor coated with the corresponding paint solution, then through solvent volatilization and oven curing, cooling and made. 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 classified by the particularity of its USES, such as self-adhesive enameled wire, refrigerant resistant enameled wire, etc.
The earliest enameled wire enameled wire is oily, made by tung oil etc. The film abrasion resistance is poor, cannot be directly used in the manufacture of the motor coil and winding, when used to cotton layer. Later PVF enameled wire, its mechanical performance is greatly improved, can be directly applied to the motor windings, and known as the high strength wire.
With the development of weak current technology has appeared the viscous enameled wire, can need not good coil dipping, baking and integrity. But the poor mechanical strength, can only be used in micro motors, small motor. In addition, in order to avoid the trouble, first remove the paint film during welding developed straight welding enameled wire, the film can fall off on their own in the high temperature in China tin slot and make it easy to copper wire welding.
As a result of the enameled wire application is becoming more and more widely, increasingly strict requirements, also developed the compound enameled wire. Inside, the outer coating is composed of different polymer materials, such as polyester imide/polyamide imide enamelled wire.
Around the envelope
An important variety of winding line. Early with cotton and silk, called cotton covered and silk covered wire, once used in motor, electric appliance. Due to the insulation thickness, low heat resistance, most have been replaced by enameled wire. Used only as a high-frequency winding line before. In medium and large sizes of winding line, when the heat level is higher and greater mechanical strength, also used glass silk covered wire, and with appropriate adhesive coating during manufacture.
Around still has a position paper covered wire, mainly used in oil-immersed transformer. The formation of oil paper insulation has excellent dielectric properties, and the price is low, long service 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 extrusion process of electrician bare copper wire (aluminum) is cable paper production line is the most ideal material.
Is developing rapidly in recent years is a thin film around the package line, mainly include polyester film and polyimide film around the package.
Close to mica tape for the wind power copper flat wire polyester imide film around the package.
When the heat level requirements beyond the limits of organic materials, usually adopt inorganic insulating paint coating. Existing lines to inorganic insulation can be further divided into glass film and oxidation film line and line of the ceramic, etc.
And composite wires, transposition wire, etc.