Generalized MMF Space harmonics and performance analysis of combined multiple-step, star-delta, three-phase windings applied on induction motors

2008 International Conference on Electrical Machines, ICEM'08 -- 6 September 2008 through 9 September 2008 -- Vilamoura, Algarve -- 75861In the paper it is developed a complete theory and method of analysis of combined star-delta three-phase windings from the point of view of MMF spatial harmonics content. The developed method is verified by means of experimental tests in a motor with a specially designed stator winding, allowing multiple-step air-gap flux regulation.© 2008 IEEE