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Four Categories of Magnet Wire

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Magnet wire is one of the main raw materials for motors. The wire used for winding or coil is called magnet wire. There are many kinds of electromagnetic wires, according to the shape of their cross-sections, they can be divided into three types: round wires, flat wires and ribbon wires. The cross-sections of round and flat wires have uniform standard dimensions. The cross-sectional size of the ribbon conductor is according to the design requirements, and can be ordered with the wire manufacturer. According to the characteristics and uses of the insulating layer, the magnet wire can be divided into four categories: enameled wire, wrapped wire, inorganic insulated wire and special magnet wire.

The enameled wire requires the paint film to be uniform, smooth, and completely covered (small number of pinholes). The diameter of the wire and the thickness of the paint film should comply with the national standards. The performance of enameled wire is determined by the paint film, and generally includes the following items:

(1) Mechanical properties. The paint film should be scratch-resistant, elastic, with appropriate softness and elongation, so as to ensure that the paint film can withstand friction, bending, stretching and compression during the winding, embedding, stretching, and shaping processes. Does not cause damage.

(2) Electrical performance. The main reason is that the breakdown voltage of the paint film should be high. For the enameled wire used for high-frequency and high-voltage motor windings, the paint film loss tangent is required to be small. For enameled wires with a diameter of 0.5 or less, the number of pinholes is a very important indicator to evaluate its electrical performance; many motor manufacturers have equipped with paint film continuity testers during the inspection of electromagnetic wires in the factory to check the number of pinholes .

(3) Thermal performance. Including the softening breakdown, thermal aging and thermal shock properties of the paint film. The softening and breakdown performance indicates the ability of the paint film to resist heat deformation under a certain pressure; the thermal aging performance reflects the ability of the paint film to retain a certain degree of elasticity after a short time of heat; the thermal shock performance reflects the paint film’s ability to be baked and dipped The ability of the paint film to withstand thermal shock (rapid cold, hot) without cracking during process or overload operation.

(4) Chemical properties. Indicates the ability of the paint film to withstand the erosion of chemicals such as acid, alkali, salt spray, organic solvents or refrigerants.

Copyright Xinyu Electrical Material Co.,Ltd. is the production of magnet wire and ECCA Wire and other products. Welcome to visit our official website.

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