The paper describes the mathematical model for the rotor-field-oriented system with induction motors which uses the estimated speed and rotor flux, based on a model-reference adaptive system, as well as the real time approach. The estimated speed is used for the speed feedback control. The stability and convergence of the estimator is improved on the basis of hyperstability theory for non-linear systems. The proposed MRAS speed estimator was applied to traction application because the integration of sensed variables was avaoided, increasing the system stability. Rotor-flux integration in the reference model is avoided, using the counter EMF-vector. Because of this, the system can operate at very low speed and high speed also, even if the rotor resistance is quite wrong or in case of overload. The real-time controller and estimator are implemnted with a sampling period of 0.926 ms using a dual TMS320C44 floating-point digital signal processor. The validity of the proposed method was verified by simulation, the sensorless control being also tested on the propulsion system simulator for the development of a Korean High-Speed Railway Train (KHSRT).


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    Sensorless control methods for variable speed drives with induction motor used in traction application

    Kisck, D. O. / Ryoo, H.-J. / Park, D.-Y. et al. | British Library Conference Proceedings | 2002


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