The insulation level of the motor is closely related to the insulation material used, and the better the insulation material, the higher the insulation level. High grade H-grade water-based insulation paint 9019W insulation material is often used for impregnation insulation and moisture-proof treatment of high speed and variable frequency high and low voltage motors, air conditioning motors, transformers, and electrical inductance coils. In electrical equipment such as generators, insulation materials are the weakest link. Insulating materials are particularly susceptible to the influence of high temperatures, which can accelerate aging and damage them. Different insulation materials have different heat resistance properties, and electrical equipment using different insulation materials have different abilities to withstand high temperatures. Therefore, general electrical equipment specifies the maximum temperature at which it operates. People have specified 7 allowable maximum temperatures for different insulation materials based on their ability to withstand high temperatures, which are arranged in order of temperature: Y, A, E, B, F, H, and C. Their allowable working temperatures are: 90, 105, 120, 130, 155, 180, and above 180 ℃. Therefore, Class B insulation indicates that the insulation used for the generator (motor) has a heat resistant temperature of 130 ℃. Users should ensure that the insulation material of the generator does not exceed this temperature during operation to ensure normal operation of the generator