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Modified Distributed Winding for Harmonic Reduction in Space MMF Distribution

This paper presents a modification in the conventional multi-phase distributed winding to reduce the space harmonics in the distribution of magneto-motive force (MMF) around the air-gap periphery. The technique used for modification in winding distribution includes the optimization of conductors per slots and the slot swapping in each phase. This method effectively reduces the dominant lower order harmonics, however, the number of harmonics reduced depends on the slots per pole per phase in the machine. The winding function approach is used to get the closed form expression of Fourier expansion of space MMF distribution. An example of 36 slot, 2 pole induction motor with both conventional single layer distributed winding (SLDW) and modified distributed winding (MDW), is used to compare the performance. The time-stepping Finite Element method is used to analyze the dynamic performance of the induction motor using the proposed winding scheme.