Low Speed Sensorless Variable Structure Control of Induction Motor

Authors:	Jezernik Karel, University of Maribor, Slovenia Edelbaher Gregor, University of Maribor, Slovenia Šabanović Asif, Sabanci University, Turkey
Topic:	4.2 Mechatronic Systems
Session:	Mechatronic Control of Motors
Keywords:	induction motors, control systems, torque control, sliding mode control

Abstract

Torque and speed sensorless induction motor control is presented in this paper. The idea is realized using a sliding mode closed loop rotor flux observer for estimation of electromotive force of machine. This signal is then used in nonlinear stator flux and torque control of induction motor and in rotor flux observer for speed and flux estimation. The analysis of the proposed method is included. Proposed control scheme was implemented on DSP system extended with FPGA where PWM procedure with dead time compensation was realized. Experimental results demonstrated high efficiency of the proposed estimation and control method.