Proposed modeling of the electromagnetic circuit, which includes: the coil wire resistance R_C, the linear inductance associated with the leakage flux ϕ_leak, the electromagnetic transduction with n_P the number of wire turns around the magnetic path, the magnetic energy storage in the ferromagnetic path described by the nonlinear induction–excitation curve ψ_PG(ϕ_PG) from (15), the linear dissipation associated with eddy-currents in the pole piece, and the constant source of magnetomotive force ψ_M due to the magnet from (17).