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Origin and Quantification of Increased Core Loss in MnZn Ferrite Plates of a Multi-Gap Inductor

Published:

November 7, 2019

Author:

Dominik Neumayr, Dominik Bortis, Johann W. Kolar, Stefan Hoffmann, Eckart Hoene

Abstract:

Inductors realized with high permeable MnZn ferrite require, unlike iron-powder cores with an inherent dis-tributed gap, a discrete air gap in the magnetic circuit to prevent saturation of the core material and/or tune the inductance value. This large discrete gap can be divided into several partial gaps in order to reduce the air gap stray field and consequently the proximity losses in the winding. The multi-gap core, realized by stacking several thin ferrite plates and inserting a non-magnetic spacer material between the plates, however, exhibits a substan-tial increase in core losses which cannot be explained from the intrinsic properties of the ferrite. In this paper, a comprehensive overview of the scientific literature regarding machining induced core losses in ferrite, dating back to the early 1970s, is provided which suggests that the observed excess core losses could be attributed to a deterioration of ferrite properties in the surface layer of the plates caused by mechanical stress exerted during machining....

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Company Information:

Power Electronic Systems Laboratory (PES)

The research projects at the PES cover a wide range of application areas and all basic forms of power electronic energy conversion

Zurich, Switzerland

Research Institute/Laboratory

  • Phone +41 44 632 28 33

Power Electronic Systems Laboratory (PES) website

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