Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pnaoj...6...59u&link_type=abstract
Publications of the National Astronomical Observatory of Japan (ISSN 0915-3640), Vol. 6 No. 2, p. 59 - 64 (2001)
Astronomy and Astrophysics
Astronomy
2
Radio Telescopes, Angle Encoder, Resolver
Scientific paper
We report measurements of angle error characteristics of new high-precision multi-speed resolvers developed for a 10-m submillimeter telescope of Nobeyama Radio Observatory. We have found the resolvers have an accuracy of 0.03" rms and 0.26" peak-to-peak, which is well below the error budget assigned to the angle encoder in the LMSA/ALMA project (0.15 - 0.2"). The error pattern in the raw readout had simple characteristics and was only composed of a few Fourier components which are associated with the number of winding poles and core slot number of stator. The 4" peak-to-peak error in the raw readout is reduced to less than 1/15 by the PROM correction. We have also found that shaft misalignment causes only small changes of error pattern (0.08" error per 0.10 mm shaft misalignment), which enables us to install the resolver simply by the fitting. The temperature dependence of error pattern also seems to be small enough for the operation temperature range specified in the project.
Ezawa Hajime
Kawaguchi Noboru
Kitazawa Kanji
Masuda Tadashi
Mimura Hisashi
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