Control system for multi-motor friction drive of a large-scale optical telescope

Yao Mao; Jia-Guang Ma; Qi-liang Bao; Song-hua Yang

doi:10.1117/12.831430

5 May 2009 Control system for multi-motor friction drive of a large-scale optical telescope

Yao Mao, Jia-Guang Ma, Qi-liang Bao, Song-hua Yang

Proceedings Volume 7281, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 728107 (2009) https://doi.org/10.1117/12.831430
Event: AOMATT 2008 - 4th International Symposium on Advanced Optical Manufacturing, 2008, Chengdu, Chengdu, China

Abstract

In terms of large-scale optical telescope, the design of multi-motor friction drive is obviously advantageous than that of single motor direct drive on the expense for manufacture of motors. However, to keep the high accuracy of tracking of multi-motor friction drive in certain velocity and acceleration, synchronized control for multi-motor and compensation to the mechanical resonance are needed. After designing appropriate multi-motor drive and synchronized compensation device, we overcame the interference among running motors, restricted the velocity difference in smooth running to a smaller range, and set a good foundation for the design of correcting parameter. Besides, to expand the closed loop bandwidth of the system, the control loop model has been identified, and the compensator based on the identified model effectively improved the influence of the mechanical resonance. The experimental results showed that for multi-motor friction drive of the 1.2-m large-scale Alt-Azimuth optical telescope, the proposed approach obtained high accuracy when running at the max velocity of 3 deg/s.

Citation Download Citation

Yao Mao, Jia-Guang Ma, Qi-liang Bao, and Song-hua Yang "Control system for multi-motor friction drive of a large-scale optical telescope", Proc. SPIE 7281, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 728107 (5 May 2009); https://doi.org/10.1117/12.831430

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