I constructed a rotary phase converter from a 5 HP motor. The converter converts 220 single phase to 240 3 phase. Well, it is supposed to. I am getting some very odd results that I am wondering if someone can help explain.
I used a ~420 uF starting capacitor and it works just fine starting up. However, the legs are out of phase when it is running. The weird part is, even if I remove the run cap completely, it is STILL out of phase! I had 3 caps on hand, a 15uF, 30uF, and 50uF. So I did some experiments and I am getting confusing results. Here are the voltages between the wires:
So there doesn't appear to be a capacitance value I can choose to get all of the legs in phase. Furthermore, why is it that the legs are out of phase with NO run capacitor? Is the back emf from the potential relay causing an unintentional phase shift???