I gave your post a long thought, can't really answer, but I came to this conclusion:
current from 2000 to 0 wont happen, because AIC diode prevents it.
current from 0 to -2000 wont happen (= electrons from -2000 to 0), because of simultaneously induced magnetic field.
since rotating field makes sinewave, what happens from 180 deg sine (negative)?
can a reverse voltage over secondary occur?
looking at the waves to wfc, it should not, but is it prevented?
how does collapsing fields interact with induced field from rotor?
(answer if you wish, I'm just thinking out loud
)