Fuzzy direct torque control of induction motor with stator flux estimation compensation

This paper introduces the design of a fuzzy controller using the direct torque control (DTC) of an induction motor. As the PWM inverter gate control signals directly come from this fuzzy controller, the controller computation speed is a key factor to obtain fast torque control. A stator flux angle mapping technique has been proposed to reduce the size of the rule base to a great extent so that the fuzzy reasoning speed increases. To enable DTC to be applied at low speed while the stator resistance drifts from its nominal value, a simple stator flux estimation compensation has been developed. The simulation results show the effectiveness of the new control strategy