How To Choose Magnetics Materials—Beyond Ferrites And Iron-Powder

Focus:

The simple and well known rule in designing transformers and coupled inductors is ferrites for transformers; iron-powder for inductors. While following this rule of thumb gives designers a starting point in selecting a core material, it does not enable the designer to choose the optimal core material within the ferrite and Fe-pwd classes of materials, nor does it allow them to take advantage of the other core materials such as NiFe, FeSiAl or NiFeMo. Or a gapped ferrite may be best. This article describes the use of ripple factors to achieve optimal selection of core materials among the various ferrite, iron-powder and other material options. In addition, core materials are ranked according to their magnetic energy density and cost—factors that can be used to guide core material selection for the cases where core selection precedes circuit design.

What you’ll learn:

• How to optimize core material section for transformers and coupled inductors using ripple factors
• How to optimize core material selection for transformers and coupled inductors given across the full range of available materials

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Author & Publication:

Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Mar 13 2020

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