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Mathematical Problems in Engineering
Volume 2014 (2014), Article ID 676202, 13 pages
Research Article

Sensorless Stator Field-Oriented Controlled IM Drive at Low Speed with Estimator

Department of Electrical Engineering, National Chin-Yi University of Technology, Taichung 41170, Taiwan

Received 1 March 2014; Accepted 18 April 2014; Published 16 June 2014

Academic Editor: Her-Terng Yau

Copyright © 2014 Wen-Cheng Pu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper pertains to a technique of a sensorless indirect stator field-oriented induction motor control, which prevents the accumulative errors incurred by the integrator and the problem relating to the stability of the control system caused by the stator resistance susceptible to temperature variations while conducting the flux estimation directly and computing the synchronous rotary speed. The research adds an adaptive flux observer to estimate the speed of the rotor and uses the fixed trace algorithm (FTA) to execute an online estimation of the slip difference, thereby improving the system of stability under the low rotary speed at regenerating mode and the influence of the rotor resistance on the slip angle. Finally, the paper conducts simulations by Simulink of MATLAB and practices to verify the correctness of the result the paper presents.