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

摘要

In 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.