Calculation of Magnetic Remanence

• Published in: IEEE transactions on magnetics Vol. 45; no. 7; pp. 2907 - 2911
• Main Author: Davey, K.R.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.07.2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Cables; Computation; Construction; Cross-disciplinary physics: materials science; rheology; Detectors; Direct current; Exact sciences and technology; Finite element methods; hysteresis; Magnetic fields; Magnetic hysteresis; Magnetic materials; Magnetism; Magnetization; Materials science; Mathematical analysis; Other topics in materials science; Permanent magnets; Physics; Remanence; Shape; Short circuits; Steel; remanence; Calculus; Magnetization; Computation; Magnetic properties; hysteresis
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2009.2014562

This paper outlines a technique for predicting the residual field in magnetizable media after the source is removed. Ship builders are considering the use of dc cables, and many land-based power systems have dc links as a power feed. What will the neighboring steel's remanent field be if the cables are excited with a large current, e.g., under short circuit conditions? This paper presents a procedure for replacing the steel with a continuum of nonlinear permanent magnets. The technique consists of discretizing the magnetizable medium into subregions, as defined by a contour plot of | B oarr|. Each subregion is assigned a magnetization curve according to the characteristic B in that region. The source field is used to assign local magnetization within these regions. The technique is novel, but the real contribution is a technique that can be implemented by any user of a commercial code, and not isolated to developers.