Effect of Stray Inductance on the Characterization of Low Permeability Iron Powders in Ring-Shaped Specimens

In this study, non-highly compressed powders are characterized to investigate the impact of stray flux inductance on their magnetic characterization. Different compositions of iron powder <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$Fe$</tex> and iron oxide powder <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$Fe_{2}O_{3}$</tex> are mixed and prepared as samples, while a non-magnetic ring-shaped container is optimized and designed to accommodate them. A precise measuring system is employed to determine the material's relative permeability characteristics for all samples. The measurement results reveal a low permeability for all samples. The approach to compensating for the stray flux inductance is discussed. Different empty coils are prepared to examine the influence of stray inductance on measurement results. It is demonstrated that compensating for air inductance is significantly more important and necessary for samples with a permeability close to that of air.