Comparative study of SVPWM techniques modified for three-phase current reconstruction using single current sensor in PMSM drive

Abstract

This paper aims at the application of three-phase synchronous motors with permanent magnets excited by a three-phase voltage inverter. Specifically, it examines the methods of phase current reconstruction with single-shunt current measurement. When measuring current with a single-shunt, complications arise in the form of impossibility of reconstruction of the phase currents near a sector boundary and in a region of small duty cycle. The paper compares two methods designed to overcome these complications and verifies them on a simulation model of a vector controlled three-phase VSI-excited PMSM drive.