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Record Details

Record 92 of 11949
M-H characteristics and demagnetization resistance of samarium-cobalt permanent magnets to 300 C
Author and Affiliation:
Niedra, J. M.(Sverdrup Technology, Inc., Brook Park, OH, United States)
Abstract: The 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.
Publication Date: Jan 01, 1992
Document ID:
19930042079
(Acquired Dec 28, 1995)
Accession Number: 93A26076
Subject Category: ELECTRONICS AND ELECTRICAL ENGINEERING
Document Type: Conference Paper
Publication Information: 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); p. 5.303-5.308.; (SEE A93-25851)
Publisher Information: Society of Automotive Engineers, Inc., Warrendale, PA, United States
Contract/Grant/Task Num: NAS3-25266; RTOP 590-13-11
Organization Source: NASA Lewis Research Center; Cleveland, OH, United States
NASA; Washington, DC, United States
Description: 6p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: DEMAGNETIZATION; ELECTROMAGNETS; HIGH TEMPERATURE; LINEAR ALTERNATORS; PERMANENT MAGNETS; POWER CONVERTERS; STIRLING ENGINES; TEMPERATURE EFFECTS; DOMAINS; FLUX DENSITY; LOSSES; PISTON ENGINES; QUADRANTS; REMANENCE; THERMAL ENERGY
Imprint And Other Notes: 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), p. 5.303-5.308.
Miscellaneous Notes: Previously announced in STAR as N92-28723
Availability Source: Other Sources
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