Originally Posted By: dalehileman

Suggesting the question, wouldn't reversing the connection to a 2-phase motor also reverse it


The two "phases" are 180° out of phase. Reversing the connection and it's still 180° out pf phase.

Originally Posted By: dalehileman
You state that splitting a 2-phase supply would give you half the voltage. Now I've forgotten near everything I used to know about all that stuff, I agree that it would. However, if each phase were 115v, wouldn't the voltage across the two lines be 208 v instead of 230 v


I bet I've forgotten more about this stuff than you have but I can't think of any reason why it shouldn't be 115 v. Doesn't even work out if you toss in sin(120°).