Modeling and control and electro hydrostatic actuator systems

The electro-hydrostatic actuator (EHA) system is a kind of compact high power actuator module through the integration of electric motor, pump, accumulator, and oil tank in a component. In order to achieve high efficiency with fast response characteristics for EHA systems, it is required to understand the effect of system parameters on the components such as hydraulic pump, cylinder, accumulator, and so on. In this paper, a specialized design method for components of EHA systems is introduced. This paper describes the EHA system design applied with bi-directional hydraulic gear pump and control algorithm and the test result to realize precision control of the designed EHA system.