Core Losses Under the DC Bias Condition Based on Steinmetz Parameters

• Published in: IEEE transactions on power electronics Vol. 27; no. 2; pp. 953 - 963
• Main Authors: Muhlethaler, J., Biela, J., Kolar, J. W., Ecklebe, A.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.02.2012; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Accuracy; Applied sciences; Core loss; Core losses; Current measurement; dc bias; Electrical engineering. Electrical power engineering; Equations; Exact sciences and technology; ferrite; Graphs; Loss measurement; Mathematical model; Nanocrystals; Silicon; Steinmetz; Transformers and inductors; Windings; High precision; Inductive circuit; Steel; Ferrites; Ferrite; Graph; Iron loss; Core losses; dc bias; Magnetic core; Silicon; Material testing; Steinmetz; Gain; Nanocrystal
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2011.2160971

The calculation of core losses in inductive components is difficult and has not yet been entirely solved. In particular, it is impossible to predict the influence of a dc premagnetization on the losses without extensive measurements. For this paper, different materials have been tested to gain information on how core losses are influenced by a premagnetization. Measurements on molypermalloy powder, silicon steel, nanocrystalline material and ferrite cores have been performed. The Steinmetz premagnetization graph (SPG) that shows the dependency of the Steinmetz parameters ( , and ) on premagnetization is introduced. This permits the calculation of core losses under dc bias conditions. Such graphs are given for different materials and different operating temperatures. In addition, a detailed description of the test system is given, as high accuracy is crucial.