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E. Csencsics, J. Schlarp, T. Schopf, G. Schitter:
"Compact High Performance Hybrid Reluctance Actuated Fast Steering Mirror System";
Mechatronics, 62 (2019), 17 pages.

This work presents the design, analysis, control and evaluation of a novel compact and highly integrated fast steering mirror (FSM) system, which is based on a hybrid reluctance tip/tilt actuator. The actuator design employs a permanent magnet for biasing the magnet circuit with a constant flux and two pairs of coils to generate a steering flux for rotating the mover around the two system axes. The system, designed to be used as scanning unit in compact optical metrology systems, uses a custom made eddy current sensor system for position measurement and a titanium flexure, which compensates the negative actuator stiffness, for suspending the mover. The FSM provides a mechanical angular range of ±3° (±52.4 mrad) and a small signal closed-loop bandwidth of 1.5 kHz in the tip and tilt axis, has a small diameter of 32 mm and a system height of only 30 mm. Compared to a state-of-the-art hybrid reluctance actuated FSM system the volume of the system is reduced by one order of magnitude, while the product of range times bandwidth, representing a measure for the system performance, is concurrently improved by 50%.

Fast steering mirror, Hybrid reluctance actuation, Flux steering, Flexure Design, Tip/tilt system

http://dx.doi.org/10.1016/j.mechatronics.2019.102251

https://publik.tuwien.ac.at/files/publik_283804.pdf