An open-loop technique for angle determination from position encoders

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Author Benammar, M. en_US
Author Ben-Brahim, L. en_US
Author Alhamadi, M.A. en_US
Author Al-Emadi, N. en_US
Author Al-Hitmi, M. en_US
Available date 2009-12-28T07:17:41Z en_US
Publication Date 2008 en_US
Citation Benammar, M.; Ben-Brahim, L.; Alhamadi, M.A.; Al-Emadi, N.; Al-Hitmi, M., "An open-loop technique for angle determination from position encoders," Industrial Electronics, 2008. ISIE 2008. IEEE International Symposium on , vol., no., pp.1044,1049, June 30 2008-July 2 2008 en_US
Abstract The paper presents a novel technique for the determination of the angle from low-frequency quadrature cosinusoidal signals produced, for example, by position sensors. In the presented scheme applied to a resolver, the separately generated constant-frequency sine wave used for exciting the resolver together with an additional cosine wave are used as reference against which the amplitudes of the angle-dependent demodulated resolver sine and cosine signals are compared. At the instant equality between amplitudes of respective signals are detected, a sample and hold circuit samples a voltage proportional to the angle of the shaft of the resolver from a triangular waveform generated from the reference signals. This is a feed-forward method, which is an analog equivalent to digital look up table techniques. In order to improve the precision of the proposed converter, a new technique is used to take full advantage of the alternating pseudo-linear segments of the trigonometric signals. With this method, the sampling relies only on the accurate comparison outside the peak regions of the signals. A converter based on this technique has been successfully implemented using basic electronic components. Theory of operation, computer simulation and experimental results are given. en_US
Language en en_US
Publisher IEEE en
Title An open-loop technique for angle determination from position encoders en_US
Type Conference Paper en_US

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