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Rotor position estimation in a switched reluctance drive using recursive least squares

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3 Author(s)
Thompson, K.R. ; Dept. of Electr. & Electron. Eng., Newcastle upon Tyne Univ., UK ; Acarnley, P.P. ; French, C.

This paper describes a new algorithm for the estimation of rotor position in a switched reluctance motor. It is based on a recursive least-squares estimator deducing both position and speed. A particular advantage of the algorithm is its ability to extract information about rotor position at very low speeds (one electrical cycle per minute) from voltage and current waveforms sampled only at the converter switching frequency. Experimental results for a 12/8 motor demonstrate that estimation is possible over the full range of operating conditions, including the field-weakening region, with a typical accuracy of better than two mechanical degrees. The paper also illustrates the performance of the algorithm by showing it operating within a sensorless position controller

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:47 ,  Issue: 2 )

Date of Publication:

Apr 2000

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