Shifted windings for improved dynamic efficiency.

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Here's something useful into this forum. From the papers. A diagram I drew of the shifted winding that reduce the 7th harmonic to nearly negligible levels in an 18N10P wind. Going from 12 to 18 slots was needed to accommodate the 4 slot shift. There's is also another shifted wind for the 24N10P. These windings shifts can also incorporate the Gerling technique of using a different number of coil turns per side which will reduce the fundamental as well. Both the non working and fundamental can be virtually eliminated using similar techniques while maintaining the advantage of concentrated coils vs. a distributed coils. It has been found that these concentrated wind techniques greatly improve the dynamic efficiency of the machines.
 
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