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M-H characteristics and demagnetization resistance of samarium-cobalt permanent magnets to 300 CThe influence of temperature on the M-H demagnetization characteristics of permanent magnets is important information for the full utilization of the capabilities of samarium-cobalt magnets at high temperatures in demagnetization-resistant permanent magnet devices. In high temperature space power converters, such as free-piston Stirling engine driven linear alternators, magnet demagnetization can occur as long-term consequence of thermal agitation of domains and of metallurgical change, and also as an immediate consequence of too large an applied field. Investigated here is the short-term demagnetization resistance to applied fields derived from basic M-H data. These quasistatic demagnetization data were obtained for commercial, high-intrinsic-coercivity, Sm2Co17-type magnets from 5 sources, in the temperature range 23 to 300 C. An electromagnet driven, electronic hysteresigraph was used to test the 1-cm cubic samples. The observed variation of the 2nd quadrant M-H characteristics was a typical rapid loss of M-coercivity and a relatively lesser loss of remanence with increasing temperature.
Document ID
19930042079
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Niedra, J. M.
(Sverdrup Technology, Inc. Brook Park, OH, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: IECEC '92; Proceedings of the 27th Intersociety Energy Conversion Engineering Conference, San Diego, CA, Aug. 3-7, 1992. Vol. 5 (A93-25851 09-44)
Publisher: Society of Automotive Engineers, Inc.
Subject Category
Electronics And Electrical Engineering
Accession Number
93A26076
Funding Number(s)
PROJECT: RTOP 590-13-11
CONTRACT_GRANT: NAS3-25266
Distribution Limits
Public
Copyright
Other

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