John Thornton wrote: > I've built several rotary phase converters using plans from the web but > they all seem to stop at adding a few caps to balance the voltage and > the auto start circuit with the potential relay. > > Have you ever peeked into your commercial unit to see what else is there? > Well, the iron and windings might be slightly different. You can measure the L-L voltages under different loads and adjust the number of caps between terminals to get the best overall balance. Also, it has been found that certain motors simply make poor phase converters, and others make wonderful ones. I have never seen a definitive report on what to look for, though, like older better than newer or vice versa, high-efficiency better than lower, 1725 better than 3450 or whatever specs are apparent from the outside. But, you might just try a different motor on this converter. ISTR that you reported some large voltage fluctuations under different load conditions a while back.
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