Control techniques for motor driven systems utilizing back-EMF measurement techniques
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United States of America Patent
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Sep 1, 2015
Grant Date -
Aug 7, 2014
app pub date -
Feb 6, 2013
filing date -
Feb 6, 2013
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Abstract
A method and apparatus for automatic resonance detection is disclosed for a motor-driven mechanical system such as a voice coil motor (VCM) in which a resonance detector and driver are provided. The automatic resonance detector is implemented on the same integrated circuit as the driver, and dynamically determines the natural resonant frequency of the VCM driven by the driver. The resonant frequency is determined by measuring the back electromotive force (BEMF) of the VCM, detecting the slope of the BEMF signal, and determining the resonant frequency from the slope of the BEMF signal.
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