The electro-hydrostatic actuator(EHA) is a kind of power-by-wire actuator that converts the electrical power into local hydraulic power which combines the benefits of conventional hydraulic system and direct drive electrical actuators. Compared to the servovalve controlled actuator, the efficiency and reliability of EHA are increased. However, the frequency width and stiffness are limited. A novel structure EHA with power regulator and hydraulic lock was proposed to overcome these problems. The power regulator managed the power distribution in EHA system according to different control requirements. The hydraulic lock helped to keep the output in desired position. Based on its mathematic equations, the optimization principle of power regulator was discussed and the control strategy was specifically designed for this EHA. The simulation results verify the improvements in response and frequency width.
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