Close loop control apparatus and method for a force rebalance tr

Details Close loop control apparatus and method for a force rebalance tr Close loop control apparatus and method for a force rebalance tr

1979-04-30

1981-08-04

Dobeck, B.

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

318601, 73517B, B64C 1702

Patent

active

042824702

ABSTRACT:
A closed loop control system for maintaining a force transducer assembly in a balanced position is disclosed. The control system has a feedback loop control circuit for providing a force rebalance signal at one of a plurality of predetermined discrete amplitude values during each of a plurality of successive equal duration time intervals. The signal has a constant amplitude during each interval. The control circuit further provides a respective digital representation for each amplitude value of the rebalance signal for each of the successive time intervals. Thereby, a precise determination of the value of the time-force product can be generated with the concomitant determination of the forces acting upon the force responsive transducer. The control system is particularly useful for non-linear transducers, such as square law devices where the time-force product is difficult to determine with continuously variable amplitude values.

REFERENCES:
patent: 2775727 (1956-12-01), Kernahan et al.
patent: 2885613 (1959-05-01), Myracle et al.
patent: 3742324 (1973-06-01), Gross et al.
patent: 3752969 (1973-08-01), Kiffmeyer et al.
patent: 3795851 (1974-03-01), Gage et al.
patent: 3875488 (1975-04-01), Crocker et al.
patent: 4020485 (1972-04-01), Busby
patent: 4102202 (1978-07-01), Ferriss

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