A procedure for measurement of magnetic characteristics in quasistatic regime

Abstract

In this paper a procedure for magnetic hysteresis measurement in quasi-static regime with a controlled rate of change of the magnetic polarization is proposed. The waveform of the polarization is modulated by means of iterative augmentation using an inverse approach. The setup, the measurement principle and the logical diagram of the procedure algorithm are presented. Experimental results obtained with the new procedure, applied on soft magnetic materials are presented. The measurements made at 0.1 Hz and 1 Hz show a difference of the characteristic values in the range of 5 % to 8 %. The paper demonstrates that, with this new procedure, quicker and more reliable measurements could be obtained.

Case study of a magnetic system for low-energy machines

“…The ratio between the largest and smallest relative permeability in the course of the load cycle is around 1.8 for a diluted yoke compared to 2.2 for a nondiluted yoke and the average relative permeability of the diluted yoke is around 40% larger than the one for the nondiluted yoke. For this study the permeability of macroscopic electrical steel samples at small fields down to 0.02 T (for mixed samples) was measured with a dedicated Epstein frame measurement setup at CERN [37].…”

“…For information, the pole fields B ¼ GR are calculated and also listed in Table X. The Epstein measurements to obtain the coercive force values as a function of the angle and the field have been performed at CERN with a dedicated measurement setup [37]. The reader is referred to the Appendix for information on the angle dependence of the coercive force and possible fitting techniques for H c ðϕ; BÞ.…”