Review of Magnetic Material Degradation Characteristics for the Design of Premagnetized Inductors

• Published in: IEEE transactions on magnetics Vol. 50; no. 3; pp. 40 - 48
• Main Authors: Friebe, Jens, Zacharias, Peter
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.03.2014; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Acceleration; Cross-disciplinary physics: materials science; rheology; Degradation; Exact sciences and technology; Inductors; Magnetic circuits; Magnetic cores; magnetic devices; Magnetic fields; Magnetic materials; Magnetism; Materials science; Mathematical analysis; Missions; Other topics in materials science; permanent magnet reliability; Permanent magnets; Physics; Soft magnetic materials; Design; Magnetic devices; permanent magnet reliability; Permanent magnets; Magnetic materials; Inductors; magnetic cores; Magnetic circuits; Magnetic properties
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2013.2284161

Premagnetization of inductors with a permanent magnet seems to be a constantly recurring subject for power magnetic designers. Perhaps because there is not much literature on this topic available, the common considerations about it focus on obvious problems of the use of permanent magnets in high-frequency magnetic fields. This paper discusses the main degradation mechanisms of permanent magnets in premagnetized inductors and how they can be calculated in applications. After a short introduction to magnetic materials this paper addresses the reliability concerns and discusses degradation effects and their calculations. The calculations of acceleration factors are shown, which are important for the calculation of the reliability based on mission profiles.