I am looking to build my own rotary phase converter for utilizing 3ph devices however I am having a difficult time wrapping my head around the aspect of producing 120* out of 180* power. PracticalMachinist forums have a plethora of threads on this topic but after reading many of them I find that a third of the people are left clueless, another third make convincing arguments but lack any visual demonstration (waveforms) and the final third simply resolve that it just works and because it just works it must be producing clean, 120* separated, AC signals. The windings are physically separated by 120* within the 3ph motor, so I completely understand how clean 3ph power would be generated by externally driving the motor. However, in the RPC circuit, the two single phase wires are [directly] two legs of your final output but are also used to drive the motor via two windings and generate voltage on the third leg in the motor. I fail to see how at least two phases of your final output would not have equal but opposite voltage at the same exact point in time. Here is an image that I thought represents the difference between RPC 3ph and true 3ph.... is it correct?