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I would never use 440v haha. I don't like going much over 72v myself. Let's say you start with a 220v 1750RPM motor. Let's say you cut windings to change it to a 110v 1750rpm motor. To double the power, you would have to "overvolt" it to 220v, which would give an rpm of 3500. Or you could just run it at 110v and get the same rpm that you would have gotten at 220v. Or you could (if you are lucky enough to know what windings to cut, and have access to them) change it to a 55v 1750 rpm motor, and then "overvolt" it to 110v and then you would have doubled the power, and 4 times the power at 220v, but then the rpm would start to get a little high.
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