Electricity: motive power systems – Positional servo systems – With protective or reliability increasing features
Patent
1983-12-27
1986-06-10
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
With protective or reliability increasing features
318565, 318632, G05B 903
Patent
active
045945373
ABSTRACT:
The capability of compensating automatically for a failure in an actuator and the associated drive circuit is enhanced by providing a dual channel actuator, each channel having a drive coil and a position sensor tracking the position of the actuator output shaft. A separate circuit is provided for each actuator channel to detect drive loop failures and hydraulic failures. When the drive loop of one channel fails, it is disengaged, and the gain in the remaining drive loop is doubled to maintain authority. In an embodiment, the remaining drive loop cannot disengage when certain criteria, relating to the failure of associated actuators, are met. The invention is particularly useful for aerospace applications.
REFERENCES:
patent: 3408024 (1968-10-01), Iverson
patent: 3422327 (1969-01-01), McBrayer
patent: 4304375 (1981-12-01), Builta
Arifian Kenneth C.
Skonieczny Joseph P.
Keane Patrick C.
Linden Gerald E.
Shoop Jr. William M.
United Technologies Corporation
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