Vector controlled AC drives

Abstract

The basic conceptual principles of operation of vector-controlled AC drives and field-oriented controllers are presented, and the direct and indirect implementations are briefly described. The key performance capability of torque control is emphasized, and mention is made of the difficulties in achieving the desired performance arising from feedback sensing and motor parameter variation. The behavior of field-oriented AC drives is contrasted with that of ordinary frequency-programmed AC drives. Some applications, such as helper drives, dynamometer drives, and propulsion drives, for which vector-controlled AC drives provide superior performance are cited.<>