BRUSHLESS MOTOR CONTROL DEVICE AND BRUSHLESS MOTOR CONTROL METHOD
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United States of America Patent
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Issued Date -
Feb 6, 2014
app pub date -
Apr 28, 2011
filing date -
Apr 28, 2011
priority date (Note) -
Abandoned
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Abstract
Regarding a brushless motor control device and a control method, the phase voltage Vsu of any one phase of the three-phase brushless motor is detected by a sub-coil (Su) (6). A time interval between adjacent zero-cross points a1 and a2 thereof is measured. Based on the time interval between the zero-cross points, a time T/3 and a time 2T/3 are calculated. Then, based on the time t/3 and the time 2T/3, phases of zero-cross points b1 and c1 of the two other phases are estimated. Then, based on the estimated zero-cross points b1 and c1, phases of the phase voltages of the two other phases are estimated, thereby controlling conduction on each phase coil of the three-phase brushless motor.
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