Low-order parametric force model for eccentric-rotor electrical machine with parallel connections in stator winding

A low-order parametric model, to accurately represent the eccentricity force acting in a salient-pole synchronous machine equipped with parallel stator windings, is proposed. The force model with parameters estimated from the numerical field calculation results exhibits an excellent performance in a wide whirling frequency range. Results presented also demonstrate the applicability of the model for the eccentricity force analysis in an induction machine. The proposed model provides an opportunity to combine the electromagnetic and mechanical analyses of electrical machine effectively.