Abstract
A novel actuator with built-in compound control function of displacement and thrust is proposed, to realize simplicity and miniaturization of a complicated hydraulic system that requires displacement and thrust control. This actuator is a kind of compact hydraulic cylinder system, which consists of a stepping motor, a control valve with a spool and a slide sleeve, a hydraulic cylinder and a mechanical feedback mechanism. In the proposed actuator, with a mechanical displacement feedback and a mechanical pressure feedback, displacement and thrust control can be realized. The basic characteristics of this actuator in the compound control of displacement and thrust are investigated by mathematical model analysis. Through the preliminary experiments,it is confirmed that the actuator is very effective in the compound control of displacement and thrust. Finally, it is shown that the precision of this actuator can be improved by introducing a dither signal.
