All of the flux path permeances are based on Eq. (1.30). The relationships shown here are for the special case of 90° and 180° angles between steel surfaces. However, the techniques that are demonstrated here can be applied to any geometry. The final forms of the flux path permeances for Figs. 1.9, 1.10, and 1.14 follow. All of the magnetic flux paths represent fringing regions except for the direct face-to-face flux path (3\).
