NDLI: Magnetic bearings for free-piston stirling engines

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Magnetic bearings for free-piston stirling engines

Content Provider	NASA Technical Reports Server (NTRS)
Author	Rao, D. K. Curwen, P. W. Wilson, D. S. Fleming, D. P.
Copyright Year	1992
Description	The feasibility and efficacy of applying magnetic bearings to free-piston Stirling-cycle power conversion machinery currently being developed for long-term space missions are assessed. The study was performed for a 50-kWe Reference Stirling Space Power Converter (RSSPC) which currently uses hydrostatic gas bearings to support the reciprocating displacer and power piston assemblies. Active magnetic bearings of the attractive electromagnetic type are feasible for the RSSPC power piston. Magnetic support of the displacer assembly would require unacceptable changes to the design of the current RSSPC. However, magnetic suspension of both displacer and power piston is feasible for a relative-displacer version of the RSSPC. Magnetic suspension of the RSSPC power piston can potentially increase overall efficiency by 0.5 to 1 percent (0.1 to 0.3 efficiency points). Magnetic bearings will also overcome several operational concerns associated with hydrostatic gas bearing systems. These advantages, however, are accompanied by a 5 percent increase in specific mass of the RSSPC.
File Size	776719
Page Count	10
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19920021490
Archival Resource Key	ark:/13960/t8tb61g4s
Language	English
Publisher Date	1992-08-01
Access Restriction	Open
Subject Keyword	Mechanical Engineering Reciprocation Spacecraft Power Supplies Magnetic Bearings Thermal Energy Power Converters Gas Bearings Hydrostatics Space Missions Stirling Cycle Energy Conversion Free-piston Engines Stirling Engines Magnetic Suspension Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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