Direct torque control of three phase induction motor drive using fuzzy logic controller

Abstract

The three phase Induction Motor (IM) has been used in most of the industrial applications and electric vehicles, due to its low cost and rugged construction. The speed control of induction motor like ac drives are affected by non-linear characteristics and sensitive parameter variation. Since stator current is responsible for the torque and flux control, induction motor control is very complex. Many researches have been proposed to address these problems in the control of induction motor drive. The popular decoupled control methods are Field Oriented Control (FOC) and Direct Torque Control (DTC). newlineIn most of the traction, electric vehicle and variable speed drives, direct torque control is preferred because of its high dynamic performance and less computation. Wide range of speed control is easier in DTC compared to other speed control techniques. The problems associated with the conventional DTC drive are high flux and torque ripple and variable newlineswitching frequency due to the hysteresis comparator, large settling time of response, and current harmonics. All these problems are concentrated in this present research work and various control methods have been proposed newline newline