Voice coil motor control system and method using pulse width modulation
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United States of America Patent
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Dec 16, 2008
Grant Date -
N/A
app pub date -
Jun 19, 2006
filing date -
Nov 28, 2005
priority date (Note) -
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Abstract
A system and method for controlling an actuator includes a control module that communicates with a plurality of switching devices to generate current through a voice coil motor during a first time period so that an actuator arm rotates in a first rotational direction in response to the current. The control module controls the switching devices to discharge the current from the voice coil motor during a second time period less than the first time period so that the first rotational direction of the actuator arm is maintained after discharging the current. The control module further includes a back electromagnetic force (bemf) module for determining a bemf voltage after controlling the switching devices to discharge the current, and an actuator arm speed control module for determining an actuator arm speed in response to the bemf voltage.
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