Measurement Method of Dynamic Hysteresis Loops on Magnetic Materials including Minor Loops

Magnetic cores used for electric power conversion are typically subjected to polarizations that either include a DC-component of the magnetic field or biased minor loops, e.g. due to PWM-like voltage or heavy harmonic content. Therefore, the correct analysis of such systems relies on the ability of hysteresis model to accurately predict these biased loops, that are generally traveled at medium to high frequency (a few 100 Hz to a few 10 kHz for laminated electrical steels). Characterization under excitations containing biased loop must then be undertaken. This work present a method to measure minor loops with well defined parameters, where the biased loops are inserted as minor loops in a slower major loop.