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Abstract

Novel sliding mode, adaptive sliding mode and model reference adaptive robust methods for speed estimation of indirect vector control drives of the traction produced by induction motors are presented in this paper. In these methods, the inputs of the proposed algorithm for speed estimation are the three phases of the currents and voltages of the induction motor. The dynamics and robustness of the proposed methods are investigated. The sensitivities of the proposed methods to the motor time constant and the speed estimation errors are examined based on the variation of machine parameters under various operational environments. The performances of the methods are compared with each other using simulations performed in a Matlab environment. It is shown that the model reference adaptive method is unable to accurately estimate the under load traction speed. In addition, the sliding mode method has design parameter uncertainty issues. However, the use of an adaptive sliding mode observer eliminates most of the encountered problems.

Keywords

Train speed sliding mode observer model reference adaptive observer induction motor traction

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A novel method for estimation of train speed and location using traction motor voltage and current

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