Characteristic improvement of a novel current observer based induction motor speed sensorless system

Abstract

We have proposed a current observer-based induction motor speed sensorless vector control system which is composed in a rotating reference frame. The characteristic improvement of this system is discussed by taking into account iron loss, stator resistance identification, current low-pass filter and speed estimation low-pass filter. The stability of the system has been investigated by the trajectories of poles and zeros. The effectiveness of the proposed system has been investigated by digital simulation and experimentation.

Speed Regulation of a Permanent Magnet Synchronous Motor via Model Reference Adaptive Control

“…Vector controlled PMSM drive [1] has very high dynamic performance and is widely used in applications like machine tools, electric vehicles etc. The system controlled by vector controlling requires the information of the speed: either from the speed encoder or from an estimator/ observer [2,3]. Elimination of the speed encoder is highly encouraged to increase the mechanical robustness of the system and to make the drive cheaper.…”