Abstract
Abstract This paper reports the design and wide-bandwidth control of a large aperture fast steering mirror (FSM) with integrated-sensing units. The developed FSM is driven by electromagnetic actuators and guided by a flexible support to achieve kinematic decoupling and large angle. Four flexible beams are used as sensing units for feedback control. A theoretical analysis of rotational stiffness was conducted to evaluate the mirror’s output angle. The dynamic characteristics were also modeled to investigate the relationship between the input voltage and the output angle of the entire system. To improve the bandwidth, a modified proportional-integral-derivative (PID) control strategy combined with feedforward compensation was employed. The prototype of the structure was fabricated and evaluated experimentally to investigate its kinematic and dynamic performance. The experimental results revealed that the angle travelled for more than 60 mrad, for both axes, with a low coupling ratio of less than 0.24%. Finally, the effectiveness of the designed controller was verified. The tracking experiment was also conducted to investigate the tracking performance of the proposed FSM.
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