The analysis through the finite element method allows us to check the pertinency of the hypothesis, according to which the flux travels, mainly, through the ferromagnetic castings and the three air-gap portions. Between two consecutive equiflux curves presented in figure 4, always travels the same quantity of magnetic flux.

The hypothesis we considered, is reduced, in fact, to the dereliction of the leakage flux (the one that does not travel the air-gap), a flux which gets smaller as the size of the air-gap that must be traveled gets smaller or as the relative permeability of the ferromagnetic material gets higher. ².