Field-theory analysis of saturation harmonics in induction machines

The amplitudes of saturation harmonics in an induction machine are evaluated by performing a nonlinear field calculation over a radial cross-section of the machine. The approach is more direct than existing methods, and has certain advantages with regard to convenience and accuracy. Overrelaxation is used to solve the field equations, and particular attention is paid to the problems that arise from the introduction of variable permeability into this procedure.