| タイトル | Comparative M-H Characteristics of 1-5 and 2-17 Type Samarium-Cobalt Permanent Magnets to 300 C |
| 本文（外部サイト） | http://hdl.handle.net/2060/19940020397 |
| 著者（英） | Niedra, Janis M. |
| 著者所属（英） | Sverdrup Technology, Inc. |
| 発行日 | 1994-03-01 |
| 言語 | eng |
| 内容記述 | Recent consideration of the use of permanent magnets in space power converters at heat rejection temperatures exceeding 250 C and in miniature high temperature actuators is supporting a search for permanent magnets resistant to demagnetizing forces at high temperature. The present paper investigates the short-term demagnetization resistance to applied bucking fields and at temperatures up to 300 C of SmCo5 type magnets, in the form of 1-cm cubes, from several commercial sources. Quasistatic, 2nd quadrant M-H data taken at selected temperatures are the source of derived plots which are then compared to similar data for previously tested Sm2Co17 type magnets. The 1-5 magnet remanence tends to be about 1.5 kG below that of the 2-17 magnets throughout the temperature range. However, the intrinsic coercivities and M-H curve 'knee-fields' seen in particular 1-5 magnets were considerably above those seen previously in the 2-17 magnets. This superior resistance to demagnetizing fields attainable in 1-5 magnets is also illustrated by safe operating area plots based on the knee-field, the magnetic induction swing and temperature. Comments are made on the possibility that a remanence versus knee-field tradeoff can make 1-5 material competitive with 2-17 in applications where a magnet has to withstand large bucking fields at high temperature. |
| NASA分類 | ELECTRONICS AND ELECTRICAL ENGINEERING |
| レポートNO | 94N24870
NASA-CR-194440
E-8481
E-8298
NAS 1.26:194440 |
| 権利 | No Copyright |
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