Bandwidth extension of hybrid-reluctance-force-based tip/tilt system by reduction of eddy currents

This paper investigates the influence of eddy currents on the dynamic behavior of a novel hybrid-reluctance-force actuator for tip/tilt systems. The effects of eddy currents on the mechatronic system dynamics are identified and modeled by a first order system approximation. Their influence on the achievable performance of a closed loop controlled system is studied by investigating two configurations of the ferromagnetic actuator yoke. An initial solid steel configuration of the yoke is compared to a layered yoke structure with isolated steel sheets, with the aim to improve the system bandwidth, which is limited by the eddy currents. Robust PID feedback controllers are designed for controlling the mover position of both system configurations, resulting in comparable phase margins. Experiments demonstrate that the closed loop bandwidth of the prototype setup can be increased from 370 Hz to 1 kHz by changing the yoke structure, which equals a bandwidth improvement by a factor of 2.8.

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