FUZZY-LOGIC ENHANCED SPEED CONTROL OF AN INDIRECT FIELD-ORIENTED INDUCTION MACHINE DRIVE

Field orientation control (FOC) of induction machines has permitted fa st transient response by decoupled torque and flux control, However, f ield orientation detuning caused by parameter variations is a major di fficulty for indirect FOC methods. Traditional probability density fun ction (PID) controllers have trouble meeting a wide range of speed tra cking performance even when proper field orientation is achieved, PLD controller performance is severely degraded when detuning occurs, This paper presents a fuzzy logic design approach that can meet the speed tracking requirements even when detuning occurs. computer simulations and experimental results obtained via a general-purpose digital signal processor (DSP) system are presented.