Precise magnetic properties measurement on electrical sheet steels under deep saturation

This paper describes an important improvement for precise magnetic properties measurements on electrical sheet steels under deep saturation. It is a new feedback mode to control flux waveform in the magnetizing power source. By utilizing the new power source, core loss testing is performed with a very pure sine wave flux (the form factor of the induced voltage of an Epstein frame F=1.111 ±0.002, the distortion factor of the voltage DF≤1%) even at a peak value of induction up to 2 teslas. The principle, circuit diagram, experimental results and its analysis are presented.