Advancements in Sensorless Control Techniques for Electric Drives

Abstract

This study reviews the work around the burgeoning field of sensorless control techniques in electric drives, fuelled by advances in power electronics and digital signal processing. The review categorizes these techniques into two primary approaches: methods relying on motor terminal quantities and those utilizing state observers. Terminal-based methods offer simplicity by measuring motor voltages and currents, while state observer techniques like the Extended Kalman Filter and Sliding Mode Observer provide higher accuracy through the estimation of internal motor states. Despite challenges such as parameter estimation and potential system instability, the study concludes that the benefits of sensorless control, including cost reduction and enhanced reliability, make it an increasingly vital component in the future of electric drive systems.