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Interesting project Doug.
I'm not too familiar with AC setups, but I would highly recommend sticking with one electric motor if at all possible. I think you will just have too much added complexity and cost with multiple motors and controllers.
Have you looked at industrial AC motors? They're not as expensive since they're mass produced. Also, industrial VFDs aren't incredibly expensive. A local EV club member went this route with his car and is quite happy with it.
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