In article , Don Foreman says...

The rotor field is always in space quadrature from the stator field.
This is well-established in about any textbook on the subject. That
being the case, the emf it induces in the third leg is necessarily
in quadrature with the emf impressed by the line (and countered by the
stator field) in the other two windings.

I thought it was the rotor *current* that was in quadrature.

Basically the rotor currents cause a rotating B field to
exist inside the stator. How it does this doesn't matter
much, but suffice it to say that the phase of the rotating
B field agrees with the incoming excitation (which of course
supplies all the power to the gizmo) which means it will
cause the correct phase voltage to exist on the third lead.

Jim


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