Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 18
Book Description
Short-Term Aging of NeFeB Magnets for Stirling Linear Alternator Applications
Author: Short-Term Aging of NeFeB Magnets for Stirling Linear Alternator Applications
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781721264919
Category :
Languages : en
Pages : 30
Book Description
NeFeB type magnets have been proposed for use in free piston Stirling engine driven, linear alternators to generate electric power during long duration space missions. These type of materials provide the highest energy product commercial magnets, thus minimizing alternator size or mass, but do not provide the high temperature stability of magnetic properties found in the SmCo type magnets. Therefore, to apply the NeFeB type magnets at elevated temperatures to multiyear space missions, their long-term aging characteristics must be determined. This report presents 200 hr aging data for six types of NeFeB magnets selected from three manufacturers. Aging was performed under vacuum at 150 C, with a steady demagnetizing field of 5 kOe applied. From the data produced by this short-term aging run, candidate magnet types were selected for a planned 12,000 hr long-term run. Depending on the manufacturer's magnet type, remanence losses observed ranged from 0 to 7%, when measured at 120 C on an established recoil line. Also, intrinsic coercivity losses up to about 4% were observed for the M-H curve at 120 C. In some cases, these coercivity losses were not recoverable by recharge of the magnet, indicating a structural change of the material. Niedra, Janis M. and Schwarze, Gene E. (Technical Monitor) Glenn Research Center NASA/CR-2001-210952, E-12806, NAS 1.26:210952
Overview of NASA Magnet and Linear Alternator Research Efforts
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781721777648
Category :
Languages : en
Pages : 30
Book Description
The Department of Energy, Lockheed Martin, Stirling Technology Company, and NASA Glenn Research Center are developing a high-efficiency, 110 watt Stirling Radioisotope Generator (SRG110) for NASA Space Science missions. NASA Glenn is conducting in-house research on rare earth permanent magnets and on linear alternators to assist in developing a free-piston Stirling convertor for the SRG110 and for developing advanced technology. The permanent magnet research efforts include magnet characterization, short-term magnet aging tests, and long-term magnet aging tests. Linear alternator research efforts have begun just recently at GRC with the characterization of a moving iron type linear alternator using GRC's alternator test rig. This paper reports on the progress and future plans of GRC's magnet and linear alternator research efforts. Geng, Steven M. and Schwarze, Gene E. and Nieda, Janis M. Glenn Research Center NASA/TM-2005-213411, STAIF-2005-093, E-14928
NASA GRC Technology Development Project for a Stirling Radioisotope Power System
Author: Lanny G. ThiemeStirling Technology Development at NASA GRC
Author: Space Technology and Applications International Forum - STAIF 2005
Author: Mohamed S. El-GenkPublisher: American Institute of Physics
ISBN:
Category : Science
Languages : en
Pages : 1512
Book Description
3rd Symposium on Space Colonization. 2nd Symposium on New Frontiers and Future Concepts, Albuquerque, New Mexico, 13-17 February 2005
Space Technology and Applications International Forum 2007
Author: Mohamed S. El-GenkPublisher: AIP Conference Proceedings (Nu
ISBN:
Category : Science
Languages : en
Pages : 1262
Book Description
The proceedings of STAIF-2007 feature a broad spectrum of topics on. These topics span the range from basic research to the most recent technology advances and hardware development and testing. The proceedings will be of particular interest to program managers, practicing engineers, academicians, graduate students, system designers, and researchers interested in the fields of space technology and space science.
Space Technology and Applications International Forum - STAIF 2004
Author: American Institute of PhysicsPublisher: American Institute of Physics
ISBN:
Category : Science
Languages : en
Pages : 1292
Book Description
Albuquerque, New Mexico, 8-11 February 2004
Space Technology and Applications International Forum - STAIF 2008
Author: Mohamed S. El-GenkPublisher: American Institute of Physics
ISBN:
Category : Science
Languages : en
Pages : 1206
Book Description
As the British, French and Spanish Atlantic empires were torn apart in the Age of Revolution, Portugal steadily pursued reforms to tie its American, African and European territories more closely together. Eventually, after a period of revival and prosperity, the Luso-Brazilian world also succumbed to revolution, which ultimately resulted in Brazil's independence from Portugal. The first of its kind in the English language to examine the Portuguese Atlantic World in the period from 1750 to 1850, this book reveals that despite formal separation, the links and relationships that survived the demise of empire entwined the historical trajectories of Portugal and Brazil even more deeply. From constitutionalism to economic policy to the problem of slavery, Portuguese and Brazilian statesmen and political writers laboured under the long shadow of empire as they sought to begin anew and forge stable post-imperial orders on both sides of the Atlantic.
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