Steady State Performance Improvement of Dtc Im Drive under Parameter and Transduction Errors

This paper presets steady state behavior of Direct Torque Control (DTC) of Induction motor (IM) drive. As in direct torque and flux control scheme electromagnetic torque and stator flux magnitude of induction motor drive is limited in closed loop without shaft sensors voltage modulator. This values are calculated with the help of dc link voltage of inverter and stator current. As during estimation of stator flux magnitude and torque results in some errors. In addition to this stator resistance mismatch also take place due to continuous operation of motor. As stator resistance is only parameter which considered during flux and hence in stator current estimation. Change in stator resistance also affects the torque linearity, and degrades the drive performance. Thus stator resistance PI compensator is adopted for the estimation and correction of stator resistance. This paper gives the theoretical finding of all errors and simulation results for adopted stator resistance PI compensator for DTC IM drive.