Applying PWM-inverter power to low-voltage induction motors-why should engineers be concerned?

Abstract

PWM (pulse-width modulated) inverter-fed induction motor drives are being used in greater numbers throughout the rubber and plastics industries. However, PWM inverters should be applied with special consideration for low-voltage induction motor operation. The power supplied to the motor by a PWM inverter has some adverse effects, which are described. These effects include increased heating, high-peak voltages, and increased audible noise. The impact these effects have on the given application are discussed. This work is for process control engineers, electrical engineers, and mechanical engineers that are applying PWM inverter-fed low voltage induction motors, not those designing them.<>