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Proceedings Paper

Design of a compliant passive magnetic bearing for use in SIRTF's Tertiary Mirror Assembly
Author(s): David M. Cannon; Margot Brereton; Harry Dill; Mark T. Sullivan
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Paper Abstract

A proposed baseline design for the Space Infrared Telescope Facility includes a Tertiary Mirror Assembly (TMA) which selectively redirects the telescope's converging science beam to each of several instruments. The TMA's mirror rotates on an axis coincident with the beam's axis,'and is held steady during observation by a kinematic mount. A bearing has been designed whose compliance causes minimal interference with the precision of the kinematic mount, and which is well suited to the particular requirements of a cryogenic sateffite such as SIRTF. The bearing suspends its rotor by taking advantage of the repulsion between a superconductor and a magnet. It potentially eliminates problems associated with mechanical bearings that arise in similar applications, such as lubricant loss or failure, bearing wear, and sensitivity to particulates, and does so without imposing the thermal load of a bearing heater or active magnetic bearing. The bearing shows promise of offering an alternative to ball bearings in cryogenic applications where some compliance is acceptable or advantageous.

Paper Details

Date Published: 1 November 1990
PDF: 10 pages
Proc. SPIE 1340, Cryogenic Optical Systems and Instruments IV, (1 November 1990); doi: 10.1117/12.23062
Show Author Affiliations
David M. Cannon, Stanford Univ. (United States)
Margot Brereton, Stanford Univ. (United States)
Harry Dill, NASA/Ames Research Ctr. (United States)
Mark T. Sullivan, NASA/Ames Research Ctr. (United States)

Published in SPIE Proceedings Vol. 1340:
Cryogenic Optical Systems and Instruments IV
Ramsey K. Melugin; Gerald R. Pruitt, Editor(s)

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