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Self-sensing magnetic bearings using parameter estimation

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2 Author(s)
Noh, M.D. ; Div. of Neurosurgery, Iowa Univ., Iowa City, IA, USA ; Maslen, Eric H.

A signal processing technique is presented by which the position of a rotor supported in magnetic bearings may be deduced from the bearing current waveform. The bearing currents are presumed to be developed with a two-state switching amplifier which produces a substantial high-frequency switching ripple. This ripple is demodulated using a parameter estimation technique which extracts the length of the bearing air gap while rejecting the influence of amplifier voltage and duty-cycle variation. The performance of the estimator is evaluated both by simulation and experiment. The method is demonstrated to produce a sensor with bandwidth of at least 1 kHz and acceptably low feed-through of the bearing force

Published in:

Instrumentation and Measurement, IEEE Transactions on  (Volume:46 ,  Issue: 1 )

Date of Publication:

Feb 1997

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