Method and device for controlling motors
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United States of America Patent
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Oct 28, 2008
Grant Date -
Jul 19, 2007
app pub date -
Feb 4, 2005
filing date -
Feb 6, 2004
priority date (Note) -
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Abstract
An electronic device is provided for controlling a motor having three phases driven by a motor driver. In one implementation, the electronic device includes a detection means and a control circuit. The detection means includes three high-gain differential amplifiers and three A/D converters. The detection means detects back EMF voltages induced by the rotation of the motor and applies corresponding signals to the control circuit. The control circuit computes and filters the position and/or the speed of the motor and then delivers the filtered values of the computed rotor position and/or speed to control the motor driver. The motor may thus be controlled even at near-zero rotational speed.
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