The Development of a Position Conversion Controller for Hydraulic Press Systems

Many industrial motion systems use electronic motors. However, big power systems that make automobile frames, roll blending machines and many other systems can't use electronic motors due the latter's relatively small power. In order to solve this problem, we propose using hydraulic systems. The open-loop control method and the close-loop control method are widely used to control hydraulic systems. Among hydraulic systems, we focus on the control hydraulic press system; particularly, the hydraulic press system that operates with vertical movement and has big weight. In this case, if the close-loop method is applied to the hydraulic press system, then vibration and noise problems will occur due to the inertia of the press system. In this paper, we propose using the conversion controller between the open-loop controller and the close-loop controller. Also, we experiment with a variety of interpolation methods in the close-loop controller in order to efficiently control the hydraulic press system.