Predictive Landing Failsafe
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United States of America Patent
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Issued Date -
Sep 17, 2015
app pub date -
Mar 13, 2015
filing date -
Mar 13, 2014
priority date (Note) -
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Abstract
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.
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