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Proceedings Paper

Modification of the azimuth control system in the LLMC
Author(s): Binhua Li; Lei Yang; Linfei Chen; Wei Mao
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Paper Abstract

A new control system of the azimuth transmission mechanism used in the Lower Latitude Meridian Circle (LLMC) is described in this paper. Because the original azimuth transmission mechanism causes too much vibration during the transposition of the horizontal axis of the instrument, we decided to modify the original system by two ways. One is to modify the lift mechanism and the azimuth transmission mechanism. The other is to replace the original stepper motors with a new type of stepper motor. According to the requirement of the new motor and its sine subdivided microstep driver, the original control system has been modified. The new system has an expansion output board and a new control program compared with the original one. The hardware architecture of the new system is described. The program in the single chip microcontroller is written in ASM, which is composed of 10 subroutines. The program in a host PC is written in C++. The methods using in controlling motors and skills in designing these programs are discussed. Two sketch flow charts of the control program are presented in the paper. Modification of the lift mechanism is also introduced. All this works make the vibration very slight.

Paper Details

Date Published: 24 October 2000
PDF: 11 pages
Proc. SPIE 4093, Current Developments in Lens Design and Optical Systems Engineering, (24 October 2000); doi: 10.1117/12.405205
Show Author Affiliations
Binhua Li, Yunnan Observatory (China)
Lei Yang, Yunnan Observatory (China)
Linfei Chen, Yunnan Observatory (China)
Wei Mao, Yunnan Observatory (China)


Published in SPIE Proceedings Vol. 4093:
Current Developments in Lens Design and Optical Systems Engineering
Robert E. Fischer; Robert E. Fischer; R. Barry Johnson; Warren J. Smith; Warren J. Smith; William H. Swantner, Editor(s)

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