High frequency injection in a matrix converter DTC drive for sensorless operation of a PMSM

Abstract

A sensorless Direct Torque Control (DTC) of a Permanent Magnet Synchronous Motor (PMSM) drive using a high frequency hf voltage injection technique without compromising the simplicity of the original DTC algorithm, is proposed in this paper. A new hf injection algorithm, in which the hf carrier is introduced by the direct modification of the fundamental voltage vectors of a Matrix Converter (MC), is developed and explained in detail. The position signal is then obtained from the direct demodulation of the resulting hf currents. Experimental results showing the effectiveness of the proposed method are shown.