Magnetic coupling effect of a PM synchronous machine having concentrated windings

Concentrated windings, in other words fractional slot windings are getting popular because of many proven advantages. In this study, a concentrated winding electric machine is designed for industrial applications. Although, in concentrated winding, mutual coupling between two adjacent coils is assumed to be zero, finite element analysis indicates that significant coupling may exist. Studies indicate that the coupling phenomena degrades fault tolerant capabilities of the concentrated winding structure. This paper, first, investigates the existence of mutual coupling then presents a new concentrated winding structure which still exploits benefits of conventional concentrated winding.