A peculiar three-phase winding is presented here.
It involves the conversion of a standard single-layer two-pole winding into something else.
It would be good to know the answers to a few questions:
What exactly does this diagram represent?
When and how is it used in practice?
What are its advantages and disadvantages compared to a standard winding?
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It is so called "combined YD" winding for higher efficiency. An example of such a conversion
can be found on the list at: https://winding.wixsite.com/design/buy-now
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