Air-gap flux splitting for the time-harmonic finite-element simulation of single-phase induction machines

A time-harmonic finite-element formulation is strongly coupled to fast Fourier transforms, discretising a particular kind of interface condition. The approach enables the splitting of the elliptical air-gap field, typical for single-phase induction machines, into two contra-rotating parts that are applied to two distinct rotor models. Motional eddy-current effects can then be incorporated by slip transformation. The simulation of a capacitor-run motor demonstrates the coupled discretization scheme and the high efficiency of this approach.