PREDICTIVE LANDING FAILSAFE

PREDICTIVE LANDING FAILSAFE

A predictive landing failsafe system is adapted to slow or stop a permanent magnet AC motor in response to a selected condition, such as a power outage. In some embodiments, the predictive landing failsafe system may short two or more terminals of the AC motor in response to the selected condition....

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: ELLIS, BRIAN, WILLIAMS, KEVIN R, KUTTEL, BEAT
Format: Patent
Sprache:eng ; fre
Schlagworte:
CAPSTANS
HAULING
HOISTING
HOISTS
LIFTING
PERFORMING OPERATIONS
TACKLES, e.g. PULLEY BLOCKS
TRANSPORTING
WINCHES
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Beschreibung
Zusammenfassung:A predictive landing failsafe system is adapted to slow or stop a permanent magnet AC motor in response to a selected condition, such as a power outage. In some embodiments, the predictive landing failsafe system may short two or more terminals of the AC motor in response to the selected condition. In some embodiments, one or more resistors may be coupled between the two or more terminals, the resistors lowering the short-circuit current and thus making a more smooth stop for the AC motor. In some embodiments, the AC motor may be used in a drawworks.