Resolver angle detection device and method of detecting position with a resolver
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United States of America Patent
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Feb 22, 2011
Grant Date -
Jul 2, 2009
app pub date -
Dec 22, 2008
filing date -
Dec 28, 2007
priority date (Note) -
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Abstract
A resolver apparatus having a high detection precision detecting angle signals from signals detected at a resolver (7) and detecting a velocity signal from the detected angle signals. Utilizing the fact that an error waveform of a resolver is comprised of predetermined n-th order components inherent to the resolver and has reproducibility, an angle error estimator (13) applies a frequency transform, for example, a Fourier transform, to high frequency components of velocity signal including error generated from detected angle signals including error to calculate a magnitude of error for each of a plurality of divided components and combining the calculated errors to reproduce the detected error and generate an error waveform signal. An angle signal correction circuit (14) uses this error waveform signal to correct an angle signal including error detected at the resolver.
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