Method and system for estimating rotor angle of an electric machine
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United States of America Patent
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Aug 19, 2014
Grant Date -
Apr 18, 2013
app pub date -
Oct 14, 2011
filing date -
Oct 14, 2011
priority date (Note) -
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Abstract
Position samples are stored from an encoder coupled to a permanent magnet electric machine. A data processor determines first changes in position between successive position samples and second changes between successive first changes in position. A data processor determines whether each first change in position is generally increasing, decreasing or constant. A corrective motion factor is applied to each stored position sample based on whether the first change in position is generally increasing or decreasing. The data processor estimates a final rotor angle of the electric machine based on a particular one of the position samples and a corresponding first change in position associated with the particular one of the position samples corresponding to a respective time.
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