Aluminum Magnet Wire is one of the main raw materials for electric machines. Electric wires used for winding wires or coils are called electromagnetic wires. According to the cross-sectional shape of aluminum electromagnetic wire, it can be divided into round wire, flat wire and ribbon wire. The cross-sections of round wires and flat wires have the same standard size. The cross-sectional dimension of the strip conductor can be customized by the conductor manufacturer according to the design requirements. According to the characteristics and uses of insulating layers, aluminum electromagnetic wires can be divided into four categories: enameled wires, wound wires, inorganic insulating wires and special electromagnetic wires.
The paint film of enameled wire and enameled wire shall be uniform, smooth and completely covered (with few pinholes). Wire diameter and film thickness shall conform to relevant standards. The performance of enameled wire is determined by the paint film and generally includes the following items:
1. Mechanical properties. The paint film shall have scratch resistance, elasticity and appropriate softness and extensibility to ensure that the paint film can withstand the effects of friction, bending, stretching and compression without damage during winding, stretching and forming.
2. Electrical performance. The main reason is the high breakdown voltage of the paint film. Enameled wires for high frequency and high voltage motor windings require small loss tangent of the paint film. For enameled wire with diameter less than 0.5, pinhole number is an important index to evaluate its electrical performance. Many motor manufacturers are equipped with a film continuity tester to detect pinhole number in the incoming inspection of aluminum electromagnetic wire.
3. Thermal performance. Including softening and breakdown, thermal ageing and thermal shock resistance of paint film. Softening and breakdown performance refers to the heat-resistant deformation capacity of paint film under pressure; Thermal ageing performance refers to the ability of the paint film to maintain elasticity after a short period of thermal action. Thermal shock performance reflects the ability of paint film to withstand thermal shock (quenching, quenching) without cracking during baking, dipping or overload operation.
4. The nature of chemistry. Indicates the corrosion resistance of paint film to chemical substances such as acid, alkali, salt fog, organic solvent or refrigerant.