Abstract
A resolver-to-digital conversion algorithm for Automatic Test System (ATS) using correlation method is presented. Sample little more than one cycle excitation signal, sine stator signal and cosine stator signal of a resolver, then use four-parameter least square wave fit algorithm to estimate the accurate frequency of the excitation signal. A standard sinusoid with any amplitude could be constructed based on the calculated frequency. Then the sinusoid is used to correlate with sine stator signal, cosine stator signal and excitation signal in order to eliminate the noises. By searching for the max values and indexes of denoised sine stator signal, cosine stator signal and excitation signal, their amplitudes and phases could be obtained. Finally based on a look-up table, any angle in 360 degrees range could be calculated with the error in 1.8e-4 rad and around 0.5 ms delay. The method shows strong portability. Computer simulation and industrial application demonstrate the effectiveness and applicability of the proposed algorithm.
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