Electricity: motive power systems – Switched reluctance motor commutation control
Reexamination Certificate
2006-04-25
2006-04-25
Duda, Rina (Department: 2837)
Electricity: motive power systems
Switched reluctance motor commutation control
C318S434000, C318S132000, C318S801000, C318S802000, C318S803000, C318S804000, C318S805000, C318S806000, C318S807000, C318S808000, C318S809000, C318S810000, C318S811000
Reexamination Certificate
active
07034478
ABSTRACT:
A three-phase spindle motor has three terminals each driven with pulse width modulated signals. Rotation of the motor is controlled by iteratively measuring an electrical period of the motor, determining a rotational position of the motor, and synchronizing the sinusoidal pulse width modulation of the spindle motor with the measured electrical period. The electrical period of the motor is measured by detecting zero crossings in the a back electromotive force induced at a first terminal of the motor and determining the time between successive zero crossings. The rotation position of the motor is determined based upon the last measured electrical period and a location of last detected zero crossing. The zero crossings are detected by selecting a time window during which the back electromotive force signal is sensed for zero crossings. The time window is selected as a function of the last measured electrical period and the rotational position of the motor.
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Bhaumik Jaydip
Brenden Jason P.
Dahlberg Dames A.
Peterson Michael
Wilson Ross
Agere Systems Inc.
Duda Rina
Hiruy Elias
Kinney & Lange PA
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