Abstract
Electro-hydrostatic transmission systems well know for high energy efficiency have been the focus of research recently. However, the progress of development has been sluggish due to the complexity in systems and difficulty in design and analysis. The objectives of this thesis are to study the design and analysis of the eletro-hydrostatic transmission systems via multi-domain computer-aided engineering software on pursuing high energy efficiency and dynamic responses. It is noted that there are three main subassemblies in the systems, namely an inverter-controlled induction motor, a fixed-displacement pump, and a hydraulic actuator, which contribute to the advantages as structure simplicity, high efficiency, and fast responses. This study has employed the ac induction motor for the power primer with the help of rotor-flux vector-controlled inverter plus sensorless speed feedback in adaptive control method with high robustness. In this thesis, inverter-controlled induction motor has been adopted for establishing the pump-controlled electro-hydrostatic systems so that the high energy efficiency and fast responses can be maintained via actuator speed feedback to the inverter controller. Finally, the simulated results based upon the multi-domain software are promising for the hydraulic engineers in the design and analysis of electro-hydrostatic transmission systems.