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Tom Whitehead
09-20-2006 21:24:18
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Re: 3 phase converter in reply to alc, 09-20-2006 10:17:21
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hi Alec,
I just went over to the machine shops site,and I found it rather confusing. I have a real simple system that I've used, and I've used for many years.I drew out a schematic for it, but I don't know how to post it as a reply.basically,you use a three-phase electric motor as an idler to generate the third leg of your current.I use a 1 hp motor to start with. So here's what you do-you feed 220 V to two of the legs of your motor, and as the motor rotates it feeds on this and it generates the third leg from your other winding.it acts exactly like a transformer, in fact that's exactly what it is. now-- it won't start on its own, so you have to give it a push somehow. What I do is connect a series of capacitors between one of the live legs and the third leg. You could also use another motor to start it, a single phrase unit. if you use capacitors, you should use about 70 to 100 �F per horsepower. make sure that you use motor run capacitors, rather than motor start capacitors. Anyway, once you have your converter motor running You can start and run any number of other three-phase motors. In fact, the more motors, you have running, the smoother your voltage will be. I have a 15 hp turret lathe. so I start my 1 hp converter, and then I use that to start another 5 hp idler motor. At that point I can power up the lathe. but don't count on your converter to do any really strong starting. It won't, for instance, start an air compressor. You would have to buy a commercially made unit for that. They do make them, but I think they're expensive. I hope this helps, if you need me to I can send you the schematic as a fax or maybe I can start a new thread and post it.
Best wishes, Tom
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