non-linear B–H curve. Compared with non-linear transient
finite element analysis, the time-harmonic analysis taking non-
linearity of the materials into account in the model saves
analytical time and memory required for the computer during
calculation [9,10].
Time-harmonic analysis was carried out with three-dimen-
sional finite element analysis software, which takes the
nonlinearity of the material into account. The operating point
on the non-linear B–H curve was found in the calculation.
Iterations were performed until the pair (Hrms, Brms) lay on the