Current Reconstruction for PMSM Drives Using a DC-Link Single Current Sensor

Abstract

This article presents field-oriented control of permanent magnet synchronous motor (PMSM) with single current sensor (DC-link). Field-oriented control requires current values flowing from three phases of the motor. These currents can be determined by current sensors to be connected to the phases as well as DC-link current sensor to be connected to supply side of invertor. Only one current value is determined by DC-link sensor. In this method, current reconstruction method is used to determine the current flowing from three phases. In this study, two different methods were compared. The mean value method and the least squares method were used to determine the current flowing through three phases using the current value measured from the DC-link current sensor. Performance evaluation of these two methods was made by comparing the integral squared error and total harmonic distortion values of the three phase currents obtained.