Ok I will admit right off the bat, I know NOTHING of sewing machines. But on phase conversion, a subject I know a little about. I built a rotary phase converter to run my 12" Clausing lathe. I will tell you with an rpc, it sure likes it electricity! If I had to do it over again, I would go with a static converter. You have to buy one for each machine, but they will let you run 3 phase off of single phase 220. http://www.phase-a-matic.com/StaticDescription.htm Travers tools has them http://www.travers.com/regular-heavy-duty-static-phase-converters?Category=electrical%20equipment%20%26%20supplies:298251||converters:298257||static%20phase%20converters:298265||UserSearch=block%20id%2034363%20and%20class%20level3%20id%20298265
I know alot of guys run their lathes and mills off of them. I should of done that lol.
Chris