A structure of giant magnetostrictive electro-hydrostatic actuator (GMEHA) was designed. The control coil was combined with permanent magnet to provide driving magnetic field. Mathematical model of the magnetic circuit was established

and the analytical calculation of magnetic flux density inside giant magnetostrictive rod was performed. Secondly

finite element analysis (FEA) for the above structurewas conducted

and the mapping principle between the main parameters of the structure and the magnetic field uniformity was got. Finally

the study of actuator magnetic field experiment was conducted

the result of the study was compared with the result of FEA

verifying the predictability of theory and finite element model

then the structure design method of this electro-hydrostatic actuator was presented. Results show that the maximum no-load output volume flow is 0.85 L/min around 250 Hz of the best driving frequency

while the maximum blocked force was close to 120N.