Electricity: motive power systems – Positional servo systems – With compensating features
Patent
1997-03-20
1999-01-05
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
With compensating features
318563, 318663, 307 108, G05B 106, B60Q 1076
Patent
active
058567321
ABSTRACT:
The servosystem includes adjusting means (1) for changing the position of mechanical element (3), a first transducer (5) for forming an adjusting voltage which is a measure of a desired position of the element, a second transducer (15) for forming a response voltage which is a measure of the actual position of the element, and detection means (13) for forming an error signal (If) which is a measure of a difference between the response voltage and the adjusting voltage. The detection means (13) have a first and a second input (11, 21) which are connected to the first transducer and the second transducer, respectively, and an output (23) which is connected to an input (27) of control means (29) for generating, in dependence on the value of the error signal, a control signal (Vc1, Vc2), for controlling the adjusting means. A compensation resistor (31) is inserted in the connection lead (9) between, for example the first transducer (5) and the input (11) of the detection means (13) connected thereto. The detection means (13) conduct a compensation current through the compensation resistor (31), which compensation current causes a voltage drop across the compensation resistor which is equal to the difference between the response voltage and the adjusting voltage, and form the error signal (If) so that its value is proportional to the value of the compensation current. Consequently, no control signal is applied to the adjusting means (1) if said connection (9) is interrupted.
REFERENCES:
patent: 3617847 (1971-11-01), Charlton
patent: 3755726 (1973-08-01), Knipe et al.
patent: 4506203 (1985-03-01), Redmond, Jr.
patent: 4549125 (1985-10-01), Sonobe
patent: 4808899 (1989-02-01), Swope
patent: 5287054 (1994-02-01), Llewellyn
Boezen Hendrik
Gerlings Jeroen A.
Mostert Frederik
Kraus Robert J.
Ro Bentsu
U.S. Philips Corporation
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