Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2005-05-26
2009-02-17
Leykin, Rita (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S459000, C318S700000, C318S368000, C318S145000
Reexamination Certificate
active
07492113
ABSTRACT:
There is provided a brushless motor drive control circuit capable of assuring an S/N ratio of a predetermined counter electromotive voltage and suppressing lowering of efficiency of a brushless motor at a high-speed rotation. More specifically, the brushless motor drive control circuit includes: counter electromotive voltage filter circuits for inputting 3-phase counter electromotive voltage induced at the end of each of the stator coils and switching between a first and a second time constant according to the rotation speed of the rotor so as to pass a low-range frequency component corresponding to the time constant; counter electromotive voltage detection comparators for inputting the counter electromotive voltage which has passed through the counter electromotive voltage filter circuit and comparing it with voltage at a neutral point so as to output counter electromotive voltage polarity signals as the comparison results; and a motor driver control circuit for switching/controlling the time constant of the counter electromotive filter circuits and controlling the motor driver according to the counter electromotive voltage polarity signals.
REFERENCES:
patent: 5225759 (1993-07-01), Endo et al.
patent: 5592058 (1997-01-01), Archer et al.
patent: 6111372 (2000-08-01), Nishimura
patent: 6181093 (2001-01-01), Park et al.
patent: 6483270 (2002-11-01), Miyazaki et al.
patent: 54-136615 (1979-10-01), None
patent: 01-234090 (1989-09-01), None
patent: 08-149879 (1996-06-01), None
patent: 11-299283 (1999-10-01), None
patent: 2002-214256 (2002-07-01), None
Fish & Richardson P.C.
Leykin Rita
Rohm & Co., Ltd.
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