Electricity: motive power systems – Positional servo systems – With protective or reliability increasing features
Patent
1978-03-21
1979-06-26
Dobeck, B.
Electricity: motive power systems
Positional servo systems
With protective or reliability increasing features
318565, 244194, G05B 902
Patent
active
041594444
ABSTRACT:
The dual electromechanical servo actuator comprises two electric servo motors coupled through differential gearing to position an output member in accordance with an input signal. Tachometer generators coupled to the respective output shafts of the servo motors, (and normally integral with the motors) provide rate feedback signals to the respective inputs of the servo amplifiers driving the respective motors. An electronic model of the dual servo actuators responsive to the input signal provides a rate signal simulating the tachometer responses to the input signal. A monitor compares the two tachometer signals and provides a failure signal when the difference therebetween exceeds a predetermined threshold. The monitor also simultaneously compares the model rate ouptut with the individual tachometer signals to determine which of the two servo channels has failed. The monitor circuits apply a brake to the servo motor output shaft of the failed channel. The remaining channel continues to properly position the output member through the differential gearing. For certain applications of the invention the monitor continues to compare the model rate output with the tachometer signal from the operating channel so as to detect a failure of the second channel and provide a fail passive condition.
REFERENCES:
patent: 3422327 (1969-01-01), McBrayer
patent: 3504248 (1970-03-01), Miller
patent: 3719878 (1973-03-01), Ferguson
patent: 4035705 (1977-07-01), Miller
patent: 4094481 (1978-06-01), DeWalt
patent: 4095763 (1978-06-01), Builta
Bartlett Larry A.
Campbell Curtis M.
Tesdal Ronald I.
Cooper Albert B.
Dobeck B.
Sperry Rand Corporation
Terry Howard P.
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