Investigation of a Four-Switch Four-Leg Inverter: Modulation, Control, and Application to an IPMSM Drive

Abstract

A permanent magnet synchronous motor (PMSM) drive based on a novel four-switch inverter is investigated in this work. No dead-time insertion/compensation is needed for the inverter because its upper and lower power devices will not shoot through. Two space vector pulsewidth modulation approaches for the four-switch inverter are developed that enable the suppression of the zero sequence voltage/current. Finally, simulation and experimental results verify that the PMSM can be effectively controlled with the novel four-switch inverter, and the system has good dynamic and static performance. The proposed approach provides a feasible alternative for low-cost motor drives.