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Control Electronics For Reaction WheelBidirectional operation achieved with single-polarity main power supply. Control circuitry generates pulse-width-modulated 800-Hz waveforms to drive two-phase ac motor and reaction wheel. Operates partly in response to digital magnitude-and-direction torque command generated by external control subsystem and partly in response to tachometric feedback in form of two once-per-revolution sinusoids with amplitudes proportional to speed. Operation in either of two modes called "normal" and "safehold." In normal mode, drive pulses timed so that, on average over one or few cycles, motor applies commanded torque. In safehold mode, pulses timed to keep motor running at set speed in one direction.
Document ID
19950065222
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Chamberlin, Keith
(NASA Goddard Space Flight Center, Greenbelt, MD.)
Date Acquired
August 17, 2013
Publication Date
February 1, 1995
Publication Information
Publication: NASA Tech Briefs
Volume: 19
Issue: 2
ISSN: 0145-319X
Subject Category
Electronic Systems
Report/Patent Number
GSC-13593
Accession Number
95B10063
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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