Fuzzy logic enhanced speed control of an indirect field oriented induction machine drive

Field orientation control (FOC) of induction machines has permitted fast transient response by decoupled torque and flux control. However, field orientation detuning caused by parameter variations is a major difficulty for indirect FOC methods. Traditional PID controllers have trouble meeting a wide range of tracking performance even when proper field orientation is achieved. PID performance is severely degraded when detuning occurs. This paper presents a fuzzy logic design approach that will meet the speed tracking requirements even when detuning occurs. Experimental results obtained via a general purpose DSP system is presented along with computer simulations