抄録
Recentry, various studies on positioning with pneumatic pistons have been carried out by using proportional valves or pulse method, etc., but the accuracies of positioning by these methods are still insufficient. A new electro-pneumatic servo-system is proposed to realize higher accuracy. The system has an analogue proportional control circiut which uses a new electro-pneumatic converter. The converter is composed of a flapper driven by solenoid, a pneumatic micrometer and a pneumatic relay. A high converting gain with wide linear range can be obtained by the device, and it can be less expensive.
The reproducibility of positioning of the servo-system was tested with a 50mm bore and 50mm stroke piston cylinder. As a result, standard deviations of the stopping position could be reduced to less than 0.004mmin the best condition of friction with replaced piston seals.
