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4 February 2003 Design of control system for fiber positioning system of LAMOST
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This paper describes the design of control system of fiber positioning system. The fiber positioning system has more than 4000 fiber units with 2 stopping motor and 2 start position sensor in each unit, and whole units will be assembled at 1.75 meter diameter focal surface of LAMOST, the mechanism and control system have demanding requirements for high precision position control. Detail design, testing and performance evaluation is described in this paper, a special control unit which can control and monitor more than 20 fiber with 1000Hz driving frequency of stepping motor and response start position sensor with one pulse of stepping motor in each fiber unit is set as a CAN bus node, 200 control units combine a can bus real time control system which can control the whole fibers move to new position in 3 minutes. In order to get high precision position in this open loop control unit, a very simple and small sensor is used to eliminate the accumulate errors of mechanism with resetting the start position, and compensation data is measured and set in control software to diminish the mechanical transmission errors. For testing the mechanism and control system, a small fiber positioning system with 19 units have been made.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Chao Zhai, Xiaozheng Xing, Hongzhuan Hu, and Weimin Li "Design of control system for fiber positioning system of LAMOST", Proc. SPIE 4837, Large Ground-based Telescopes, (4 February 2003);

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