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International Journal of Rotating Machinery
Volume 2012 (2012), Article ID 276906, 13 pages
Research Article

A Rotor Flux and Speed Observer for Sensorless Single-Phase Induction Motor Applications

1Department of Electrical, Electronics and Telecommunications Engineering, University of Palermo, Vialle delle Scienze, Edificio 9, 90128 Palermo, Italy
2Department of Control and Automation Engineering, School of Mines, Federal University of Ouro Preto, Campus Morro do Cruzeiro, 35400-000 Ouro Preto, MG, Brazil

Received 6 October 2011; Revised 5 January 2012; Accepted 26 January 2012

Academic Editor: Hyeong Joon Ahn

Copyright © 2012 Massimo Caruso 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.


It is usual to find single-phase induction motor (SPIM) in several house, office, shopping, farm, and industry applications, which are become each time more sophisticated and requiring the development of efficient alternatives to improve the operational performance of this machine. Although the rotor flux and rotational speed are essential variables in order to optimize the operation of a SPIM, the use of conventional sensors to measure them is not a viable option. Thus, the adoption of sensorless strategies is the more reasonable proposal for these cases. This paper presents a rotor flux and rotational speed observer for sensorless applications involving SPIMs. Computer simulations and the experimental results are used to verify the performance of the proposed observer.