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Optical Engineering

Modeling and design of a normal stress electromagnetic actuator with linear characteristics for fast steering mirror
Author(s): Yongjun Long; Xiaohui Wei; Chunlei Wang; Xin Dai; Shigang Wang
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Paper Abstract

A new rotary normal stress electromagnetic actuator for fast steering mirror (FSM) is presented. The study includes concept design, actuating torque modeling, actuator design, and validation with numerical simulation. To achieve an FSM with compact structure and high bandwidth, the actuator is designed with a cross armature magnetic topology. By introducing bias flux generated by four permanent magnets (PMs), the actuator has high-force density similar to a solenoid but also has essentially linear characteristics similar to a voice coil actuator, leading to a simply control algorithm. The actuating torque output is a linear function of both driving current and rotation angle and is formulated with equivalent magnetic circuit method. To improve modeling accuracy, both the PM flux and coil flux leakages are taken into consideration through finite element simulation. Based on the established actuator model, optimal design of the actuator is presented to meet the requirement of our FSM. Numerical simulation is then presented to validate the concept design, established actuator model, and designed actuator. It is shown that the calculated results are in a good agreement with the simulation results.

Paper Details

Date Published: 7 May 2014
PDF: 12 pages
Opt. Eng. 53(5) 054102 doi: 10.1117/1.OE.53.5.054102
Published in: Optical Engineering Volume 53, Issue 5
Show Author Affiliations
Yongjun Long, Shanghai Jiao Tong Univ. (China)
Xiaohui Wei, Shanghai Jiao Tong Univ. (China)
Chunlei Wang, Shanghai Jiao Tong Univ. (China)
Xin Dai, Shanghai Jiao Tong Univ. (China)
Shigang Wang, Shanghai Jiao Tong Univ. (China)

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