Low-speed sensorless control of induction Machine
Edelbaher, G.; Jezernik, K.; Urlep, E.
Industrial Electronics, IEEE Transactions on
Volume 53, Issue 1, Feb. 2006 Page(s): 120 - 129
Digital Object Identifier   10.1109/TIE.2005.862307
Summary: Induction motor (IM) speed sensorless control, allowing operation at low and zero speed, optimizing torque response and efficiency, will be presented in this paper. The magnitude and the orientation angle of the rotor flux of the IM are determined by the output of the closed-loop rotor-flux observer based on the calculation of the extended electromotive force of the machine. The proposed rotor-flux-oriented control scheme is robust to parameter variations and external disturbances. Both observer and controller utilize the continuous sliding mode and Lyapunov theory. A smooth transition into the field-weakening region and the full utilization of the inverter current and voltage capability are thus possible. The produced torque is a continuous output variable of control. The performance of the proposed method is investigated and verified experimentally on a digital signal processor.

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