An open-loop technique for angle determination from position encoders

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An open-loop technique for angle determination from position encoders

Show simple item record Benammar, M. Ben-Brahim, L. Alhamadi, M.A. Al-Emadi, N. Al-Hitmi, M. 2009-12-28T07:17:41Z 2009-12-28T07:17:41Z 2008
dc.identifier.citation 2008, Article number 4676934, Pages 1044-1049 en_US
dc.description.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
dc.language.iso en en_US
dc.title An open-loop technique for angle determination from position encoders en_US
dc.type Article en_US

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