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A BAPTA employing rotary transformers, stepper motors and ceramic ball bearingsThe utilization of rotary transformers as an alternative to slip rings for the power transfer from solar panels to a satellite's main body could be advantageous, especially if an ac bus system is taken into consideration. Different approaches with main emphasis on the electromagnetic design were investigated and showed efficiencies of up to 99% with a 3 kW power capability. A solidly preloaded pair of ball bearings with ceramic balls assures proper transformer air gaps and acceptable torque changes over temperature and temperature gradients. The bearing and power transfer assembly is driven by a direct drive stepper motor with inherent redundancy properties and needs no caging mechanism.
Document ID
19810013870
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Auer, W.
(Teldix Luftfahrt-Ausruestungs G.m.b.H. Heidelberg, 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
Electronics And Electrical Engineering
Accession Number
81N22401
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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