On Sat, 12 Jun 2004 19:31:32 GMT, "Alan Black" wrote:
. They're orthogonal to each other, so going around the diamond
clockwise, each adjacent set of wires has a voltage magnitude between them
which
is sqrt(2)/2 the pair voltage across each phase pair (polarities at any
given snapshot
instant swap as you move from quadrant to quadrant, of course).



Ah! That explains the 90 degrees, 90X4=360, but if that is the case why
wouldn't be 4 phase?

It could be called that, but by convention a 180 degree phase shift is
considered only a periodic polarity reversal.

Gary