Abstract :
A direct torque control system for a variable speed induction motor drive consists of two hysteresis comparators, a selection table, a flux and torque estimator, and a PID speed controller. With this control structure, the drive performance can be significantly improved when compared to field oriented control. In the paper, the principles and characteristics of a direct torque control system are considered. It is also shown that by means of a more complex selection table, the performance of the direct torque control system may be improved further
Keywords :
induction motor drives; machine control; magnetic flux; parameter estimation; three-term control; torque control; variable speed drives; velocity control; PID speed controller; direct torque control system; flux estimator; hysteresis comparators; selection table; torque estimator; variable speed induction motor drive;
