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Analysis, testing and control of telescope’s high-precision drive system in low-temperature environment
DU Fu-Jia; ZHANG Jian; WEN Hai-Kun
Source PublicationAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation
PagesVol.9151 3B-1-7
Conference Date2014-6-22
Conference PlaceMontréal, Quebec, Canada
Funding OrganizationSPIE
Other Abstract
Antarctic is perfect site for astronomic observatory. But Antarctic also challenge the telescope design because of low temperature. The low temperature can impact characterization of telescope control system, especially for drive system. The following phenomenon can be produced due to low temperature. 1. The viscosity of grease will increase. 2. The clearance of bearing and gear will decrease. These two factors can lead to the increase in load torque of drive system with temperature drop. This would cause the bad tracking accuracy and low speed creeping. In order to overcome the
impact of low temperature and improve the telescope’s track accuracy. In this paper, we describe some methods to overcome the effect of low temperature. First, the motor’s electromagnetism and lubrication in low temperature are analyzed. It shows that motor’s electromagnetism is little affected by temperature if the suitable material is selected. But
the characterization of grease change dramatically with temperature. Second, the other lubricant material, solid lubricant, instead of lubricating grease is proposed. Contrasting experiment on two lubricant material proved that the solid lubricant is better than lubricating grease in low temperature environment. Third, besides the mechanical solution, a method from control point view is proposed to reduce the temperature influence. In this paper, the friction feedforward algorithm is used to compensate the torque change. Laboratory testing results will be presented verifying that friction feedforward can increase the tracking accuracy in low temperature environment.
KeywordLow Temperature Environment Lubricating Precision Driving Friction Feedforward
Subject Area南极望远镜 ; 自动控制
Document Type会议论文
Recommended Citation
GB/T 7714
DU Fu-Jia,ZHANG Jian,WEN Hai-Kun. Analysis, testing and control of telescope’s high-precision drive system in low-temperature environment[C]:SPIE,2014:Vol.9151 3B-1-7.
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