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Speed Sensorless Variable Structure Torque Control of AC Motor

In this lecture the torque and speed sensorless AC motor control will be presented. The main idea consists in merging the structures of the motor observer and the controller in such a way that electromotive force of machine determined in observer is used as a feedforward term in the controller. In addition the AC motor observer is using combination of the feedforward and feedback terms in order to enhance the sensitivity of the observer. Torque and flux control as well as the observer of AC motor are based on the sliding mode methods so guarantying high degree of robustness towards parameters variation and the external disturbances. The stability analysis of the observer and the controller is discussed in detail. Proposed control scheme is implemented on DSP system extended with FPGA where switching procedure with dead time compensation is realized. Experimental results demonstrated high efficiency of the proposed estimation and control method. Keywords: induction motors, control systems, torque control, sliding mode control.
Type of Seminar:
Public Seminar
Prof. Karel Jezernik
University of Maribor, Slovenia
Nov 30, 2005   17:15

ETH Zentrum, Gloriastr. 35, Building ETZ, Room E6
Contact Person:

Prof. M. Morari
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Biographical Sketch:
Prof. Karel Jezernik received B.S. (1968), M.S. (1974) and Dr.Eng. (1976) degrees in electrical engineering from the University of Ljubljana. He was a Visiting Research Fellow in Institute of Control, TU Braunschweig (1974-1975). In 1976 he joined the University of Maribor and in 1985 he become a Full Professor and Head of the Institute of Robotics. His research and teaching interests include automatic control, robotics, power electronics and electrical drives. Current projects in these areas are high precision tracking control in machine tools and DD robots and robust torque control in EV's. He consults in industrial servo control systems and other control and computer applications. Dr. Jezernik is an active member of the IEEE IES where he organized several conferences. Currently he hold position VP for Technical activities.