Variable speed resistive network for a pneumatic servo assembly

Details Variable speed resistive network for a pneumatic servo assembly Variable speed resistive network for a pneumatic servo assembly

1984-07-06

1986-04-15

Dobeck, B.

Electricity: motive power systems

Automatic and/or with time-delay means

Pressure in a fluid or granular material

318645, H02P 516

Patent

active

045830290

ABSTRACT:
A resistive network is used for an electro-pneumatic converter so that the speed of the electro-pneumatic converter can be regulated. The converter includes a reversible DC servo motor having a pair of terminals connected to a pair of lines. The lines are selectively connectable to a common terminal of a power supply. The power terminal of the power supply is connected over a variable resistor to a terminal connecting the lines. Selectively connecting one of the lines to the common terminal causes electrical power to pass through the motor and one for an opposite direction to turn the motor shaft in a selected direction of rotation. The speed of rotation is determined by the position of the variable resistor. The motor shaft is used in conjunction with a cam that is associated with a nozzle supplied with pressurized gas over a bellows. The nozzle is moved closer or further away from the cam edge as the bellows expands or contracts. A line connected upstream of the bellows provides gas at a selected pressure which is porportional to the position of the cam. The position of the cam is determined by the rotation of the motor shaft.

REFERENCES:
patent: 2568586 (1951-09-01), Hunt et al.
patent: 2990780 (1961-07-01), Kreuter
patent: 3363161 (1968-01-01), Marlow et al.
patent: 3971973 (1976-07-01), Nakano
patent: 4296363 (1981-10-01), Blake et al.
patent: 4316130 (1982-02-01), Louarn

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