However, Pulse Width Modulation (PWM) which was input from inverter is characterized by steep rising edge and highfrequency, resulting in the too early failure of motor insulation.
Features: temperature coefficient of capacitance at a certain temperature range is small and similar to polycarbonate. Low loss at highfrequency. Small size. light weight. Highinsulation.
特点：在一定温度范围内电容量温度系数小，接近于聚碳酸脂介质，高频损耗小，体积小，重量轻，绝缘电。
3
The insulation class F or class H . The insulation of open-loop U/f condition of . structure has the adaptability to high carrie frequency voltage supplied by frequency converter .