Title :
A fuzzy observer for induction motor stator resistance for application in direct torque control
Author :
Zhong, L. ; Rahman, M.F. ; Lim, K.W. ; Hu, Y.W. ; Xu, Y.
Author_Institution :
Sch. of Electr. Eng., New South Wales Univ., Sydney, NSW, Australia
Abstract :
The direct torque control (DTC) system is one of the favourable control schemes for AC motor drives since it has the important advantage that system performance is not dependent on the motor parameters except the stator resistance. However, if the stator resistance varies due to heating, the performance of the system will suffer if the stator resistance value used in calculating the stator flux does not match the actual one. The compensation for the effect of the variation of stator resistance then becomes necessary. This paper describes a fuzzy observer, which can estimate the stator resistance online, according to the actual stator current, motor speed and operation time. The fuzzy observer for stator resistance proposed in this paper is applicable not only in the DTC systems of induction and permanent magnet motors but also in other type of motor drive systems
Keywords :
electric resistance; electric resistance measurement; fuzzy logic; induction motor drives; machine control; machine theory; observers; parameter estimation; permanent magnet motors; stators; torque control; compensation; direct torque control; fuzzy observer; induction motor stator resistance; motor operation time; motor speed; permanent magnet motors; stator current; AC motors; Control systems; Fuzzy systems; Induction motors; Motor drives; Permanent magnet motors; Resistance heating; Stators; System performance; Torque control;
Conference_Titel :
Power Electronics and Drive Systems, 1997. Proceedings., 1997 International Conference on
Print_ISBN :
0-7803-3773-5
DOI :
10.1109/PEDS.1997.618670
