Fuzzy controller in AC servo motor drive

This paper presents the use of fuzzy control in AC servomotor drive applications. Comparison of performances obtained with an usual proportional integral (PI) controller and a fuzzy controller in both current and speed loops are presented. Simulation with the Matlab simulink package permits a comparison of the obtained responses to a reference step change, to a perturbation step change and to parameter uncertainties. For experimentation, both controllers are implemented on a DSP system card which controls a 1.1 kW induction machine with the field oriented control method. The authors show that the fuzzy controller is very robust: low sensitivity to parameter variations; and high rejection of perturbation. Experimental results on the speed loop are presented