Generalized Theory for the Starting Performance of Single-Phase Induction Motor with Asymmetrical Windings

An analysis is developed for the starting performance of single-phase induction motors having asymmetrical windings not in quadrature. Based on Morrill´s double-revolving field concept, the analysis leads to an equivalent circuit which accounts satisfactorily for all the space harmonics including those arising from irregular winding distribution. All the parameters for the equivalent circuit can be calculated from the design details.