An electric drive for a vehicle uses an inverter circuit configured to provide a multi-phase AC drive signal to an electric machine according to a PWM drive signal. A PWM controller monitors an operating point of the electric drive and is configured to identify an operating region of the electric drive from a plurality of predetermined regions in response to the monitored operating point. A sequence memory stores a plurality of sequences, each sequence optimized for a respective one of the predetermined regions to reduce audible noise and switching losses. The PWM controller generates the PWM drive signal according to a respective sequence corresponding to the identified operating region. Thus, the reduction of audible noise and switching losses is optimized based on torque and/or speed of the motor.