Insulation is an important component of the electrical part of single-phase asynchronous motor products, involving magnet wires, composite insulating materials, impregnating paint, surface paint, slot wedges, terminal blocks, lead wires, insulating hoses, mica and other materials or components; Motors with different voltage levels have different insulation structures, and the selected raw materials and processing techniques are also different. Among them, magnet wire is one of the most widely used and necessary materials. Motors with different uses and voltage levels require different performance levels. the electromagnetic wire.
The magnet wires used in single-phase asynchronous motor products mainly include enameled round wires, enameled flat wires, mica wires, thin film wires, bare copper wires, sintered wires, etc. Withstand performance level of turn-to-turn, voltage-to-earth and phase-to-phase voltage surges.
The enameled wire is mainly used for the stator and rotor windings of low-voltage single-phase asynchronous motors. There are different types of magnet wires according to different heat resistance grades. The more commonly used heat resistance grades are 155, 180 and 200. There are also special magnet wires that meet such requirements. In some special designs, the electrical technology is not very good, or the motor operating conditions are relatively bad, the single-phase asynchronous motor manufacturers will specially choose the thick paint film magnet wire. But for the frequency conversion motor, in principle, the special magnet wire for the frequency conversion motor should be used, which can enhance the quality level of the motor winding.
The more commonly used magnet wires for wound rotors mainly include enameled round wires, enameled flat wires and bare copper bars, small power or infrequently used winding motors, and the rotor part generally uses enameled round wires, which is what we often call soft windings; But for high-power low-voltage motors and high-voltage motors, enameled flat wires or bare copper bars are more commonly used.
Compared with the soft winding, the ventilation and heat dissipation effect of the formed winding is better, especially in the case of over-speed operation, the probability of the rotor winding being thrown out is relatively small; however, due to the limitation of the electromagnetic wire type, the corresponding rotor iron The core slot shape is limited in size and is not as flexible as the soft winding slot shape.
Magnet wires of different insulation types match different types of single-phase asynchronous motors. The insulation performance of the windings is the basis for ensuring the safety of the motor, but the welding inside the windings is an unavoidable link for any winding; relatively speaking, the soft windings can The continuous process is used to reduce the internal joints, while the joints of the formed winding are relatively large. Therefore, a reliable welding process must be used to ensure the quality level of the winding. At the same time, the insulation effect of the connection part should not be lower than the insulation performance level of the magnet wire itself. .
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