That was kind of a fun gig. Someone paid me $350 to make a pahse converter out of parts that cost me about $50 (10 HP Baldor motor, fused disconnect switch, oil caps etc). Took me about 1.5 hours to do. This is a rope start phase converter with both legs balanced with capacitors (90 uF per leg on a 10 HP idler).
At idle, the voltages were something like 243, 247, and 248 volts.i