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The syncronous rectification controller I think can be modified pretty easily to power a sepex motor. But if you already have a controller for the field, then I don't see why it would be a problem for the standard controller controlling the armature. With smaller inductance, it would mean current changes faster, which would mean possibly changing the P and I constants for the PI loop. I think jackbauer is running a sepex motor with the open source control board, and a custom IGBT controller. It's 11" diameter too.
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