Improvement for EMF wave form used Fractional Slot Winding of Permanent Magnet Type Synchronous Machine

About Permanent Magnet Type Synchronous Machine, especially the generator is required to decrease THD of EMF wave form. In this paper is expressed about Fractional Slot Windings, to improve the THD performance without increasing the slot numbers at multi-poles design. The Prototype is for the middle speed drive train for Wind Turbine, then THD and Efficiency performance is inspected and reported.