Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sass...27..123g&link_type=abstract
The Society for Astronomical Sciences 27th Annual Symposium on Telescope Science. Held May 20-22, 2008 at Big Bear Lake, CA. Pub
Astronomy and Astrophysics
Astronomy
Scientific paper
A modest aperture alt-az telescope has been designed and is being built for student use at California Polytechnic State University. The telescope's drive system has no gears, belts, or friction wheels; instead direct drive motors and high resolution encoders are completely integrated into the bearing assemblies and telescope superstructure. In altitude, for instance, a ring of permanent magnets is firmly mounted to the OTA while an opposing ring of coils is mounted on the inside of a fork arm. The electronic control system has been designed to operate these brushless motors in a high- precision mode. To achieve the highest possible closed loop servo bandwidth, the structure was designed -- using finite element analysis as well as traditional tools -- to have a very high natural frequency. The direct drive system and stiff structure should effectively counter wind gusts when the telescope is operated out in the open or within a roll-off roof observatory.
Albertson Billy
Branch Howard
Chelborad Cary
Chiu Wilson
Genet Russell M.
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