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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.
Fractional Winding is used for permanent magnet type synchronous machine to improve the EMF form and cogging etc. This paper report the characteristics of q=1/2 and q=3/8 (q<0.5) especially. And the mixed coils in each phase winding we called, can give the flexibility of winding design. We report the advantages of this winging method with theory and measured data.
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