The Importance Of Knowing Magnetic Core Saturation Field Strength For Accurate Hysteresis Loss Calculation
by Gregory Mirsky, Design Engineer, Deer Park, Ill., How2Power Today, Jan 15 2025
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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