A Flexible Ring-Core Measurement Set-Up for Soft Magnetic Materials

This paper introduces a flexible measurement set-up for the characterization of soft magnetic materials based on a ring-shaped method. In the proposed configuration, the primary winding is positioned off the specimen's surface to enhance measurement flexibility and significantly reduce set-up time. The new approach is compared with a standard toroidal configuration by evaluating both DC and AC magnetic performance on a steel and FeSi specimen. The resulting J-H curves from the two methods exhibit excellent agreement, with a maximum relative error lower than 5%. The equivalence of the solutions is also confirmed by the AC hysteresis loops. The tests assess the reliability and precision of the proposed solution.