Rotary Phase Converter (Create 3-phase power from a single phase source)

[nhengineer]

That is still single phase in drawing with center tap transform
I see why the confusion But this is single phase power AKA as 3 wire single phase

Dave

Please Smithdoor, go look at the drawing again and then follow the link. It is clearly explained, both on the drawing and in the text of the link, that you begin with 2-wire single phase (left side of drawing) and wind up with 3-wire 2 phase 180° apart (middle of drawing).