Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Patent
1983-12-15
1985-07-02
Dobeck, B.
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
318482, 318632, 318607, 73321, G05D 900
Patent
active
045271070
ABSTRACT:
In liquid measuring apparatus, a cable supporting a sensing plate is attached to a drum that is connected via a magnetic clutch with the drive shaft of a servomotor. The servomotor is supported in a pivot mount which is flexibly rotatively connected to the apparatus housing. In response to liquid level changes, a contactless sensor generates a signal which is compared with a balance of moments reference signal in a comparator to develop a deflection signal which, after conversion into frequency pulses in fast servocontrol circuitry, activate the servomotor in one direction or the other as determined by a polarity switch activated by a directional decoder. Inaccuracies due to parts vibrations are compensated for. Also, measurement disturbances caused by waves at the surface of the liquid are avoided with the aid of slow servocontrol circuitry which, after a delay, activates the servomotor with an adjustable frequency supplied by an oscillator. The changeover between the two control circuits is accomplished by switches which are activated by the deflection signal from the comparator applied to the switches by way of an attenuator and a window discriminator.
REFERENCES:
patent: 2728041 (1955-12-01), Boundy et al.
patent: 3643981 (1969-08-01), Wires
patent: 3729667 (1973-04-01), Taylor
patent: 4274039 (1981-06-01), Glassey et al.
patent: 4442389 (1984-04-01), Sawada et al.
Mertens Dieter
van der Pol Ronald
Dobeck B.
Rheotron AG
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