Abstract
The paper deals with an enhanced MATLAB Simulink model of a fuzzy-controlled system for a symmetrical six phase motor supplied with modified PD-I and PD-I fuzzy controllers and analyzes its performance and transients at special form speed references and step response. The Simulink model of the motor was developed with the actual parameters of a six-phase motor having a displacement of phase windings by 60 electrical degrees. The model of the six phase motor is based on the d-q mathematical model and indirect field-oriented control. A fuzzy controller with per unit input and output membership functions and 49 rules is designed. The simulation results are presented and analyzed. The results with modified PD-I and PI-D fuzzy controllers indicate the robustness of the modelled system with six-phase motor against disturbances and follow the reference input with great accuracy. The fuzzy controlled system’s response to complex reference input indicates a small speed delay at the beginning of the process and accurate following of the response input with an error smaller than 0.75 % during the application of load torque disturbance. The step response and response to complex reference input has no overshoot nor steady-state error.
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