In this paper, steady state characteristics of the solenoid actuator for electro-hydraulic proportional valve determined by the shape of control cone are analyzed using finite element method and it is confirmed that the proportional solenoid actuator has a constant attraction force in the control region independently on the stroke position. And the shape of control cone is optimized using (1+1) evolution strategy to get a constant force. In the optimization algorithm, control cone length, thickness and taper length are used as design parameters.
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