Prediction of magnetisation hysteresis loops for oriented silicon steel

Hysteresis loops produced in oriented 3% silicon steel by peak flux densities in the range 1.4¿¿1.8 T are predicted by simple formulas. The formulas are based on the increasing sides all having the same shape, and the width of the loop being dependent on the increment below the peak and independent of actual peak value. Agreements of a few percent with published loops are possible. Minor loops are also predicted and modified to give sensible results when the minor loop almost returns to the main-loop peak. Agreement with published data is not as good for minor loops.