Synchronous Reluctance Machine: Combined Star-Delta Winding and Rotor Eccentricity

A permanent magnet assisted synchronous reluctance machine (PMaSynRM) under static and dynamic rotor eccentricity has been studied, using the finite element method (FEM). Unlike the conventional star connected machine, a 5.5 kW machine with a combined star-delta winding configuration in the stator has been considered in this study. The impact of a combined star-delta configuration on the eccentricity forces and unbalanced magnetic pull of the PMaSynRM has been investigated, and a comparison with the conventional star connected machine has been presented. Moreover, other electromagnetic quantities of interest such as the magnetic flux density distribution and the induced back emf in the windings are also analyzed. Two prototype PMaSynRMs, having similar stator and rotor stack iron and geometrical parameters with two different stator winding, have been manufactured. The theoretical findings have been validated with measurements on the prototypes.