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What I understand: if you overspin an excited 3 phase motor you generate a voltage that exceeds the volts applied to the field windings. Hence regen.
However what constitutes overspin and at what excitation levels I dunno. Huebner on Diyelectric or Major will have better answers.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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