The Importance Of Knowing Magnetic Core Saturation Field Strength For Accurate Hysteresis Loss Calculation

Focus:

Magnetic cores manufacturers very seldom provide full hysteresis loops for their products. Although a previous work has shown how to calculate core power loss using an expression for the hysteresis loop derived from a core’s data sheet specifications, it assumed values Hsat and -Hsat based on Bsat/µ, without clearly defining how to determine the acceptable value of permeability. In this article, a method is proposed for defining Hsat based on an analytic expression for the core permeability dependence on the magnetizing field induced in the core. It assumes dependence of permeability on the applied magnetic field and a value of an admissible permeability loss due to the magnetization strength H rise. Using the new expression for Hsat derived here, we’ll see how it can be applied to the previously derived expression for hysteresis loss in a design example.

What you’ll learn:

• How to determine magnetic component core loss using an expression for the hysteresis loop derived from data sheet values and which considers an acceptable level of permeability loss

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Author & Publication:

Gregory Mirsky, Design Engineer, Deer Park, Ill., How2Power Today, Jan 15 2025

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