Method and Apparatus for Sensing of Levitated Rotor Position
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United States of America Patent
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Issued Date -
Sep 26, 2013
app pub date -
Mar 11, 2013
filing date -
Mar 20, 2012
priority date (Note) -
Abandoned
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Abstract
A pump with magnetically-levitated rotor includes a position sensor having an eddy-current sensor coil that operates as a resonating element in a low frequency oscillator located within the pump housing. The oscillator is operably interconnected with additional electronics that shift the frequency of the oscillator output signal to a lower frequency. The lower frequency signal is directed to a frequency measurement circuit that provides a value representing a position of the rotor.
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