When a conventional high frequency IGBT-switched PWM inverter is used to drive motors with a long lead, one big concern is the voltage stress due to the surge voltage which may occur at motor terminal. This paper proposes that such surge voltage could be reduced by using a simple-controlled soft-switched PWM inverter to replace the conventional one as drives. By performing simulation and experiments, we have investigated the characteristics of the surge voltages involved in both the conventional and the soft-switched inverters. The results confirm that the surge voltages can be indeed reduced significantly when the soft-switched inverter is used.
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