  This paper presents a novel digital control strategy successfully implemented
for a soft magnetic material characterization bench (Epstein frame type). The
main objective is to control the magnetic induction waveform whatever the
applied excitation and the material under study. Given the nonlinear nature of
the magnetization curves of magnetic materials, an original model-free based
control technique is considered. Special mention should be made of the
interesting dynamic properties in closed-loop against the changes of the
operating point related basically to the hysteresis form. The operation and the
performances of the digital control method are illustrated in different working
conditions through both simulation and experimental measurements.
