As a first example, Fig. 6(a) shows a commercial inductor
rated at 2.2 μH, 7 mΩ, and 12 A [13]. The interior of this inductor
was examined by cross sectioning so that the solid model
in Fig. 6(b) could be constructed for finite-element analysis of the flux distribution throughout the core volume. After sweeping
the permeability of the magnetic core, finite-element simulation
suggested that the core material ought to have relative
permeability of 35 to achieve the rated inductance.