Invention Application
- Patent Title: Predictive Landing Failsafe
- Patent Title (中): 预测着陆失效
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Application No.: US14656930Application Date: 2015-03-13
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Publication No.: US20150263650A1Publication Date: 2015-09-17
- Inventor: Beat KUTTEL , Gary PACE , Kevin R. WILLIAMS , James GARAGHTY , Tommy SCARBOROUGH
- Applicant: CANRIG DRILLING TECHNOLOGY LTD.
- Main IPC: H02P3/22
- IPC: H02P3/22 ; E21B19/084 ; B66D1/54 ; B66D1/12

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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