HIGH ACCURACY PNEUMATIC POSITIONER MADE UP OF TWO COOPERATING ACTUATORS

抄録

This paper deals with the development of a pneumatic system aimed at position control of servo-axes. The device is made up of two cooperating actuators, integrated in a single structure able to perform a linear displacement of the endeffector. One actuator is a standard pneumatic cylinder, the second one is of semi-rotary type: its angular stroke is converted to linear by means of a hall-screw system.
By combining with a proper strategy the motion of the two actuators, a very accurate control of the end effector position can be achieved.
The paper gives a description of the mechanical device and the control system of the positioner, then describes the control strategy, finally shows some experimental results obtained