Online estimation of stator resistance of an induction motor for speed control applications

Umanand, L and Bhat, SR (1995) Online estimation of stator resistance of an induction motor for speed control applications. In: IEE Proceedings of Electric Power Applications, 142 (2). 97 -103.

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Abstract

Speed control of induction motors requires the accurate estimation of the fluxes in the motor. But the flux estimate, when estimated from the stator circuit variables, is dependent on the stator resistance of the induction motor. As a consequence, the flux estimate is prone to errors due to variations in the stator resistance, especially at low stator frequencies. A scheme is presented in this paper for an online estimation of the stator resistance under steady state operating conditions, using variables that can be measured from the terminals of the motor alone. The scheme is based on estimating the steady-state magnitudes of the stator and rotor flux space phasors using the reactive power. An analysis of the effect of the stator resistance variations on the flux estimate is presented. A simulation of a rotor field oriented speed control of a VSI-fed induction motor using stator circuit variables is performed incorporating the online stator resistance estimation strategy.

Item Type:	Journal Article
Publication:	IEE Proceedings of Electric Power Applications
Publisher:	IEE
Additional Information:	Copyright of this article belongs to Institution of Electrical Engineers (IEE)
Keywords:	Induction motors;Stator resistance;Speed control;Flux estimation
Department/Centre:	Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited:	22 Sep 2005
Last Modified:	19 Sep 2010 04:20
URI:	http://eprints.iisc.ac.in/id/eprint/3707

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