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Thursday 20 March 2014

Direct Torque Control of Permanent Magnet Synchronous Motors – An Overview

Abstract—

In high-performance servo applications a rapid and accurate torque control is desired, preferably without the use of a motion-state sensor. The use of permanent magnet synchronous motors (PMSMs) combined with the direct torque control (DTC) scheme offers many opportunities to achieve this goal. Recently several authors have proposed possible implementations of direct torque control for permanent magnet synchronous motors. In this paper an overview is given. The basic principles of DTC for PMSMs are explained. Topologies and algorithms described in the literature for interior PMSMs as well as surface mounted PMSMs are discussed. Estimations of stator flux linkage and initial rotor position are needed in these control schemes. Techniques to achieve these estimations are discussed in this paper as well. The main goal of the paper is to give an outline of what is already achieved and to determine points of interest for further research.





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