Dual linear motors synchronous control for horizontal axis of far-field target motion simulators

This paper proposes a simple synchronous control scheme for a linear servo system applied to driving the horizontal axis of far-field target motion simulators(TMS). The investigated horizontal axis is driven by two parallel linear motors, which are arranged at both ends of the vertical axis. This layout, which can improve the system dynamics, overall thrust and structural stiffness, requires accurate synchronous control. To meet this requirement, the velocity difference compensation scheme is proposed to reduce the synchronous errors. Prior to this, the parallel synchronous control model of dual linear motors is established, and a stiffness coefficient is introduced to consider the impact of the mechanical connection coupling between these two linear motors. The performance of the proposed method is verified by a S-curve motion profile, and the simulation results substantiate the effectiveness of the control method.