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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.

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Type	CR22	CR25	FCR33	FCRF33	FCR38	FCRF38
Thickness μm	22±2	25±2	33±3	33±3	38±3	38±3
Tensile strength MPa	≥135	≥135	≥80	≥80	≥80	≥80
Elongation at break %	≥40	≥40	≥40	≥40	≥40	≥40
Dielectric strength MV/m	≥200	≥200	≥120	≥120	≥120	≥120
Surface resistivity Ω	≥10¹⁴	≥10¹⁴	≥10¹⁴	≥10¹⁴	≥10¹⁴	≥10¹⁴
Volume Resistivity Ω.cm	≥10¹²	≥10¹²	≥10¹²	≥10¹²	≥10¹²	≥10¹²
Width mm	According to customer’s requirements
Length m	According to customer’s requirements