Sensorless BLDC motor systems and driving methods of sensorless BLDC motor
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United States of America Patent
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Sep 16, 2014
Grant Date -
Sep 27, 2012
app pub date -
Jan 10, 2012
filing date -
Mar 24, 2011
priority date (Note) -
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Abstract
Provided is a sensorless BLDC motor system. The sensorless BLDC motor system includes a BLDC motor, a comparator, a motor controller, a three-phase inverter, and a mode selector. The BLDC motor includes first to third coils. The comparator compares a voltage of a specific coil of the first to third coils with a neutral-point voltage to output the compared result. The voltage of the specific coil becomes equal to the neutral-point voltage and a specific time elapses, and then the motor controller generates first and second coil control signals based on the compared result. The three-phase inverter supplies a source voltage or ground voltage to the specific coil, or floats the specific coil, in response to the first and second coil control signals. The mode selector selects a driving mode of the BLDC motor by adjusting the specific time.
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