Method and apparatus for sensing brushless DC motor average...

Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits

Reexamination Certificate

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Details

C361S023000, C361S087000, C323S274000, C323S284000, C318S432000, C318S434000

Reexamination Certificate

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07463464

ABSTRACT:
A method and an apparatus that permit the measurement of the motor average current directly from the output of the amplifier and filter stage used for instantaneous dc-link overcurrent protection. As such, only one amplifier and filter stage is sufficient to provide both the motor average current and instantaneous dc-link overcurrent protection. The invention permits the suppression of the amplifier and filter stage that is typically used to derive the motor average current directly from the dc-link current.

REFERENCES:
patent: 4446498 (1984-05-01), Stich
patent: 4500820 (1985-02-01), Noto et al.
patent: 5079494 (1992-01-01), Reichard
patent: 5675231 (1997-10-01), Becerra et al.
patent: 2003/0107863 (2003-06-01), Kelwaski

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