Method and apparatus for encoder interpolation
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United States of America Patent
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Apr 3, 2018
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app pub date -
Mar 31, 2017
filing date -
Mar 31, 2016
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Abstract
Methods and apparatus disclosed herein implement or otherwise embody a technique that compensates for cyclic position errors in encoder-based position detection, wherein the cyclic position errors arise from the presence of harmonic components in the encoder signals relied upon for position determination. Using position-domain compensation for errors arising in the encoder domain offers computational simplicity and impressive compensation performance, even when compensating for a plurality of higher harmonics in the encoder signals, e.g., third harmonic, fifth harmonic, etc. Consequently, even high-precision position monitoring or control can use relatively inexpensive types of encoders known to output encoder signals having significant harmonic components.
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