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Proceedings Paper

Cryogenic Testing Of Stepper Motors
Author(s): Stephen M. Pompea; Frank Bartko; James R. Houck
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Paper Abstract

Stepper motors operating at temperatures below 16°K may be used extensively in high sensitivity infrared instruments. However, the behavior and reliability of Hators operating at cryogenic temperatures have not been extensively characterized. We summarize our experimental investigation of stepper motor performance in vacuum at LN2 (76oK) and LHe (4oK) temperatures. Initial tests demonstrated that stepper motors fail at LN2 temperatures due to differential thermal contraction arising from the use of different metals in the motor construction. The motors were then modified to compensate for thermal contraction differences and one of the modified motors was successfully tested at LHe temperatures. It ran normally for 112 hours without any significant degradation either in its voltage waveform pattern or with any significant differences between its pretest and post-test holding torques. These test results may aid cryogenic instrument designers who utilize electro-mechanical devices in planned facilities such as the Shuttle Infrared Telescope Facility (SIRTF).

Paper Details

Date Published: 16 November 1982
PDF: 9 pages
Proc. SPIE 0331, Instrumentation in Astronomy IV, (16 November 1982); doi: 10.1117/12.933437
Show Author Affiliations
Stephen M. Pompea, Colorado State University (United States)
Frank Bartko, Martin Marietta (United States)
James R. Houck, Cornell University' (United States)

Published in SPIE Proceedings Vol. 0331:
Instrumentation in Astronomy IV
David L. Crawford, Editor(s)

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