Posted by Andy Martin on January 30, 2019 at 16:41:30 from (209.213.149.60):
In Reply to: Phase converter posted by Jims on January 30, 2019 at 12:06:10:
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I've run my mill for several years this way. The rule is your idler motor needs to be at least as big as the biggest motor you want to start. My mill is three HP and my idler is 5 HP.
Years ago an electrical engineer did an analysis of this system on Fine Woodworking magazine. He claimed you could get 85% of the driven motor HP out of it.
I've heard you can use a capacitor to kick off the three phase idler but mine has a sheave on it, I just kick spin it then close the switch and it takes off.
You best bet on a welder these days is a solid state one anyway, and as others have said, single phase predominates. The only three phase welders I've come across are industrial eight packs and the old Lincoln bullet welders.
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