MOTOR ROTATION SPEED CONTROL DEVICE AND METHOD THEREOF
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United States of America Patent
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Issued Date -
Jun 30, 2011
app pub date -
May 5, 2010
filing date -
Dec 30, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A motor rotational speed control device for controlling a direct current (DC) brush motor is provided, which includes a motor driver, a detection unit and a central processing unit (CPU). The motor driver is coupled to a first control terminal and a second control terminal of the DC brush motor. The detection unit detects a back electromotive force (EMF) of the DC brush motor through the first control terminal and the second control terminal when the motor driver is set to a disable state, and accordingly generates back EMF information. The CPU determines whether the direct current brush motor has stopped rotating according to the back EMF information, and determines whether to generate a brake control signal according to a determination result. The motor driver reduces a rotation speed of the DC brush motor according to the brake control signal when the motor driver is set to an enable state.
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