交流伺服系统在天文望远镜中的应用研究初探  

The Preliminary Study on Application of AC Servo System in Astronomical Telescope

作　　者：张升华[1] 黄垒[2] 魏建彦[2] 郑莉芳[1] 刘奇[3] Zhang Shenghua Huang Lei Wei Jianyan Zheng Lifang Liu Qi(University of Science and Technology Beijing, Beijing 100083, China National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China University of Chinese Academy of Sciences, Beijing 100049, China)

机构地区：[1]北京科技大学,北京100083 [2]中国科学院国家天文台,北京100012 [3]中国科学院大学,北京100049

出　　处：《天文研究与技术》2017年第3期337-346,共10页Astronomical Research & Technology

基　　金：国家自然科学基金(U1331202)资助

摘　　要：交流伺服系统在工业控制领域得到了广泛应用,但在天文领域的应用仍处于初级阶段。以中法合作天文卫星(Space multi-band Variable Object Monitor,SVOM)的地面观测设备地基广角相机阵(Ground-based Wide-Angle Camera,GWAC)为研究平台,研究了交流伺服系统应用于望远镜转台控制的可行性。测试了望远镜的跟踪速度控制精度、赤经跟踪精度、最大角速度、最大角加速度、重复指向精度等关键技术指标。测试结果表明,和步进电机系统相比,交流伺服系统在低速控制上具有同样高的精度。在高速控制领域,其调速范围更宽,速度调节更快,运行更平稳,具有明显的优势。另外,还具有低噪声、大转矩、高性价比等优点。实验中还测定了交流伺服系统对Apogee CCD U9000x的干扰,结果表明,交流伺服系统对CCD的干扰很小,在可接受的范围内。总之,交流伺服系统完全可用于中小型天文望远镜的转台控制,特别适用于快速转动和指向的系统。AC servo system is widely used in industrial control field, but the practical application in the controlling of astronomical telescope is still in the initial stage. In this paper, ground-based wide-angle camera （GWAC） which is the ground observation equipment of SVOM astronomical satellite is used as the research platform, and the AC servo system is applied to the turntable controlling of telescope. The telescope＇s tracking speed accuracy, tracking accuracy, pointing accuracy and other key technical indicators are tested and compared with the indicators of stepper motor system. The test results show that the two systems have high precision in low-speed controlling. AC servo system has advantages in high-speed controlling, with wider speed range, faster speed regulation and smoother running. In addition, AC servo system also has low noise, high torque, high performance and low price. The interference of AC servo system with the CCD is tested by experiment. The results show that interference of AC servo system with CCD is in acceptable range. In short, the AC servo system can be used for the turntable controlling of small and medium-sized telescope, especially for the system of fast rotation and pointing.

关 键 词：地基广角相机阵 交流伺服系统 关键技术指标 对CCD的干扰 

分 类 号：P111[天文地球—天文学]