Corona Resistance PI Film

From last century 1980s, variable-frequency and variable-speed motor took place of Dc speed-regulating motor. Among all the speed adjustment mode, frequency control developed fastest because of its good performance and efficiency, so it has been widely used. But, the interturn of variable-frequency motor will easily happen partial discharge, so it will need insulation protection between winding coils, especially for Corona Protection. Corona Resistance PI film has excellent corona resistance, electrical property, thermal property, radiation resistance and chemical properties, so it can be used widely in large scale traction motors, variable frequency motors, wind power motors and other equipment, especially in the field of Chinese bullet train motors.