However, Pulse Width Modulation (PWM) which was input from inverter is characterized by steep rising edge and high frequency, resulting in the too early failure of motor insulation.
然而，逆变器输出的PWM(脉冲宽度调制)连续高压脉冲的上升沿很陡、频率很高，导致在脉冲电压下牵引电机绝缘过早失效。
Features: temperature coefficient of capacitance at a certain temperature range is small and similar to polycarbonate. Low loss at high frequency. Small size. light weight. High insulation.
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。
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 .
电动机的绝缘等级为F级或H级，绝缘结构具有对变频器输出高载波频率电压的适应能力。
According to the theory of high frequency vibration insulation, the vibration insulation system of the compressor is redesigned.
基于高频隔振理论，重新设计了该型压缩机的压簧隔振系统。
Study on high frequency acoustical performance of a ventilation and sound insulation window using transfer matrix method;
首次利用整体传递矩阵法对机床主轴双转子耦合系统的动力特性进行了详细研究。
Study on high frequency acoustical performance of a ventilation and sound insulation window using transfer matrix method;
首次利用整体传递矩阵法对机床主轴双转子耦合系统的动力特性进行了详细研究。
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