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A drive unit for the instrument pointing systemThe requirements, capabilities, and unique design features of the instrument pointing system drive units (DU) are presented. The DU's are identical for all three gimbal axes (elevation, cross elevation, and azimuth) and provide alternating rotation of shaft versus the housing of + or - 180 deg. The design features include: two ball bearing cartridges using cemented carbide balls coated with TiC a layer; redundant brushless torque motors and resolvers; a load by-pass mechanism driven by a dc torque motor to off-load the bearings during ascent/descent, ground transportation, and to provide an emergency breaking capability; and cabling over each gimbal axis by means of cable follow-up consisting of 13 signal and 15 power flat band cable loops. Test results of disturbance torque characteristics are presented.
Document ID
19810013875
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Birner, R.
(Messerschmitt-Boelkow-Blohm G.m.b.H. Munich, Germany)
Roth, M.
(Messerschmitt-Boelkow-Blohm G.m.b.H. Munich, Germany)
Date Acquired
August 11, 2013
Publication Date
May 1, 1981
Publication Information
Publication: NASA. Marshall Space Flight Center The 15th Aerospace Mech. Symp.
Subject Category
Mechanical Engineering
Accession Number
81N22406
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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