Calculations presented are limited to certain regulated polyphase induction motors driven by pulse-width modulated VFDs at the drive’s rated nameplate voltage.Pulse Width Modulation (PWM) VFDs provide a more sinusoidal current output to control frequency and voltage supplied to an AC motor. PWM VFDs are more efficient and typically provide higher levels of performance. A basic PWM VFD consists of a converter, DC link, control logic, and an inverter.