@inproceedings{e0dded7b7a95429790ce3aa9a5339631,
title = "Testing a prototype rotary mechanism for GMTIFS",
abstract = "The GMTIFS instrument requires multiple rotary mechanisms that will operate in a cryogenic environment. Angular precision up to one arc-second is required without the use of IR sources as part of an encoder. A general design that uses an annular conical rim bearing supported by three pairs of tapered pinch rollers has been proposed. One pair of pinch rollers is mounted on a flexure hinge to provide preload and accommodate thermal expansion. A pair of off set cylindrical cams carried by the rotor, and four capacitive distance sensors fixed to the stator are utilized to implement a resolver. This provides a measure of the rotor orientation that is insensitive to runout of the rotor. A prototype of this design was constructed and tested in the lab to investigate the effect of runout in the tapered rollers and assess the performance of the rim bearing and various resolver designs. We present the results of this testing.",
keywords = "Capacitive, Cryogenic, Resolver, Rim bearing, Runout",
author = "I. Price and J. Hart and E. O'Brien and R. Sharp and G. Gausachs and G. Bloxham and C. Vest and J. Gilbert and B. Espeland",
note = "Publisher Copyright: {\textcopyright} 2018 SPIE.; Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III 2018 ; Conference date: 10-06-2018 Through 15-06-2018",
year = "2018",
doi = "10.1117/12.2312337",
language = "English",
isbn = "9781510619654",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Roland Geyl and Ramon Navarro",
booktitle = "Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III",
address = "United States",
}