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since it is kinda related, I'll just leave this here. But the idea is to push the fields to their current limit, and switch to delta well into the field weakening part of wye (and careful switching back) so you can push the field current back up (though that is going to affect bemf...).
this quick and dirty needs reverse blocking on the delta switches, so it is 3x dual igbt + 3 single reversed, though it may be possible to reconfigure the inverter or something and use less switches.
I'm just guessing here, probably time to sort out a dyno (or read bajillions of speculative papers and all the hieroglyphs therein).
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