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Special-Purpose High-Torque Permanent-Magnet MotorsPermanent-magnet brushless motors that must provide high commanded torques and satisfy unusual heat-removal requirement are developed. Intended for use as thrust-vector-control actuators in large rocket engines. Techniques and concepts used to design improved motors for special terrestrial applications. Conceptual motor design calls for use of rotor containing latest high-energy-product rare-earth permanent magnets so that motor produces required torque while drawing smallest possible currents from power supply. Torque generated by electromagnetic interaction between stator and permanent magnets in rotor when associated electronic circuits applied appropriately temporally and spatially phased currents to stator windings. Phase relationships needed to produce commanded torque computed in response to torque command and to electronically sensed angular position of rotor relative to stator.
Document ID
19950071290
Document Type
Other - NASA Tech Brief
Authors
Doane, George B., III (Alabama Univ.)
Date Acquired
August 17, 2013
Publication Date
December 1, 1995
Publication Information
Publication: NASA Tech Briefs
Volume: 19
Issue: 12
ISSN: 0145-319X
Subject Category
MACHINERY
Report/Patent Number
MFS-26285
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.