Current Error SVPWM based Speed Sensorless IM Drive with Stator Resistance Estimation

摘要

A current error space vector PWM (CESV-PWM) based speed sensor-less vector control scheme with on-line stator resistance estimation for induction motor (IM) drive is presented in this paper. The current error space vector PWM based control introduces inherent protection against over-current while ensuring fast dynamic response. Absence of speed sensors makes the overall drive system rugged. A stator resistance estimator is employed to improve the accuracy of the speed estimator at low speeds and high loads. The proposed scheme is extensively simulated on a MATLAB-Simulink environment. The scheme is experimentally verified on an induction motor using TMS320F28335 DSP as the digital platform for control scheme implementation.