This paper presents an improved Direct Torque Control (DTC) based on fuzzy logic technique. The major problem that is usually associated with DTC drive is the high torque ripple. To overcome this problem a torque hysteresis band with variable amplitude is proposed based on fuzzy logic. The fuzzy proposed controller is shown to be able to reducing the torque and flux ripples and to improve perfo...

This paper investigates a novel direct torque control (DTC) for a sensorless interior permanent magnet synchronous motor (PMSM) based on a sliding mode technique (SMC). The speed and position of the interior PMSM are estimated online based on active flux concept. To overcome the large ripple content associated with the direct torque, a torque/flux sliding mode controller has been employed. Two ...

Direct torque control (DTC) of induction motor is prominent to offer instant and flux with a simple structure. However, this scheme suffers from two major drawbacks namely high ripple variable switching frequency the inverter, especially during low-speed operation. During condition, positive slope very steep overshoot occurs frequently resulting in become great significance. This paper proposes...