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Multiphase machines are becoming an alternative to the three-phase standard in high power applications with high reliability requirements. Due to the capability to inherit off-the-shelf three-phase technology, the most popular choice at industry is the use of multiple threephase windings. The disposition of the different sets of threephase winding is however varied. In the specific case of sixphase machine, a spatial shifting among the three-phase windings of 0o, 30o and 60o has been used in dual-three-phase, asymmetrical and symmetrical machines, respectively. This spatial displacement has an impact on the power quality of the currents that supply the machine since the same magnetomotive force (MMF) in the airgap can be generated with different harmonic cancellation between phases. This work considers an arbitrary spatial shifting of the threephase windings in order to explore its impact on the power quality from the machine-side. Extensive simulation results compared the different types of six-phase machine and some conclusions are extracted about the advantages of each choice.

Analysis of the Power Quality in Six-phase Induction Motor Drives with Arbitrary Winding Spatial Shifting