Efficient PMSM-Inverter-Based Drive for Vehicular Transportation Systems.

This paper proposes a controller to minimize the overall drive system's losses and the key inverter and motor losses by mapping machine's speed and torque demands to an optimal state current and switching frequency. The objective function takes into account copper and core losses of the machine along with conduction and switching losses of the inverter. The effect of the inverter harmonics on the voltage and current waveforms is modeled and shows that while higher switching frequency increases inverter loss, it decreases the machine's loss. The inverter switching frequency varies with the speed and load torque. The voltage and current limitation are used as the constraint. The effects of the current, voltage, and switching frequency are shown on the losses of the machine and the inverter. The result of optimization for each pair of speed and load torque is the corresponding $dq$ axes current and switching frequency. A control system is implemented based on the optimization scheme to verify the optimization process. The effectiveness of the control system is verified experimentally. [ABSTRACT FROM AUTHOR]