dv/dr滤波器在感应电动机保护中的应用

通过对全变频自动扶梯故障案例的分析，得出PWM逆变器在应用中产生的dv／dt及脉冲电压是损坏电动机绝缘的主要根源的结论。通过实验表明，dv／dt滤波器可降低峰值电压及dv／dt，从而对电动机的线圈起到保护作用，提高电动机的可靠性以及延长电动机的使用寿命。最后，强调dv／dt滤波器在全变频控制系统中对电动机保护的重要性与必要性。

Application of the dvldt Wave Filter to the Protection of Inductive Motors

According to the analysis of full variable frequency escalator＇s accident, this article draws a conclusion that dv/dt and impulse voltage which caused by application of PWM controller inverter is the main cause of damaging motor insulation. Experiments show that dv/dt wave filter reduces peak value voltage and dv/dt result in the protection of motor coil and promote the reliability and longevity of motor. We emphasize the dv/dt wave filter＇s importance and necessity of protecting motor in full variable frequency control system.