Sensorless direct field oriented control of induction machine by flux and speed estimation using model reference adaptive system

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2004

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Şimşek, Günay

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This work focuses on an observer design which will estimate flux-linkage and speed for induction motors in its entire speed control range. The theoretical base of the algorithm is explained in detail and its both open-loop, and closed-loop performance is tested with experiments, measuring only stator current and voltage. Theoretically, the field-oriented control for the induction motor drive can be mainly categorized into two types; indirect and direct field oriented. The field to be oriented may be rotor, stator, or airgap flux-linkage. In the indirect field-oriented control, the slip estimation based on the measured or estimated rotor speed is required in order to compute the synchronous speed. There is no need for the flux estimation in such a system. For the direct field oriented case the synchronous speed is computed with the aid of a flux estimator. In DFO, the synchronous speed is iv computed from the ratio of dq-axes fluxes. With the combination of a flux estimator and an open-loop speed estimator one can observe stator-rotor fluxes, rotor-flux angle and rotor speed. In this study, the direct (rotor) flux oriented control system with flux and-open-loop speed estimators is described and tested in real-time with the Evaluation Module named TMS320LF21407 and the Embedded Target software named Vissim from Visual Solutions Company.

Subject Keywords

Production of Electric Energy.

URI

http://etd.lib.metu.edu.tr/upload/12604965/index.pdf
https://hdl.handle.net/11511/14172

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

G. Şimşek, “Sensorless direct field oriented control of induction machine by flux and speed estimation using model reference adaptive system,” M.S. - Master of Science, Middle East Technical University, 2004.