Measurement method for normal magnetization curve of soft magnetic composites with high magnetization currents

Issue title: 13th International Workshop on 1&2 Dimensional Magnetic Measurement and Testing (2014)

Subtitle:

Guest editors: Carlo Appino, Cinzia Beatrice, Fausto Fiorillo and Carlo Ragusa

Article type: Research Article

Authors: Owzareck, Michael

Affiliations: BLOCK Transformatoren GmbH, Verden 27283, Germany. Tel.: +86 49 4231 678 358; E-mail: Michael.Owzareck@BLOCK.eu

Abstract: The measurement of the material properties of soft magnetic composites is yet a technical challenge because of the high magnetization currents in the saturation region [1]. If in an initially closed magnetic circuit an external air gap is introduced, the normal magnetization curve inclined more and more and flattened. This effect is referred to as shear. In powder composite materials this effect is called internal shear, since air gaps caused by the isolation of the individual powder particles. The high magnetization currents and magnetic field strengths occur because of this internal shear. The high magnetic field strengths cause a high apparent power demand for the measurement sample. In this work two advanced test method for measuring the normal magnetization curve of powder composites are presented and compared with each other. With this measuring method it is also possible to perform magnetic measurements in the saturation region. The normal magnetization curve is required for finite elements calculations and analytical calculations up to the saturation.

Keywords: Magnetic measurement, soft magnetic composites, normal magnetization curve, toroidal core

DOI: 10.3233/JAE-151985

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 48, no. 2-3, pp. 181-186, 2015