Skewing effect on the PM Flux-Linkage high harmonics of the PM machines with delta winding

This work deals with the analysis of the high-harmonic contents on the PM flux-linkage and induced back-emf of a PM machine at no-load and with delta connected winding topology. The skewing effect on these unwanted high-harmonics is investigated for a continuously skewed and a discrete skewed rotor topology. The FE results show that the PM flux-linkage of the studied machine contains high harmonics of odd order. When the phase windings are connected in delta the PM flux-linkage and resulting induced back-emf contains high harmonics of order 3^rd and 9^th. Further, the analysis performed here show that using skewed rotor topology these high harmonics clearly can be reduced.