Multiturn rotational sensor
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United States of America Patent
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app pub date -
May 3, 2010
filing date -
May 24, 2006
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Abstract
A rotational sensing system is disclosed that includes a first sensing device including a first portion fixed to a body to rotate therewith in unison and provide a plurality of first device signals, a second sensing device including a second portion mechanically coupled to the body to rotate with a mechanical turn ratio relative to the body and provide a plurality of second device signals, and signal processing circuitry responsive to the first device signals to represent rotation of the first portion relative to the body with a virtual turn ratio different than unity and the mechanical turn ratio. This signal processing circuitry also includes logic operable to provide an output representative of rotational position of the body over an angular range spanning more than 360° as a function of the first device signals and the second device signals based on the virtual turn ratio.
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