Okay, this strikes me as the holy grail - 3-phase AC motors of less than 208 volt. I don't know if there are any commercial manufacturers of these, though.
This guy apparently made his own:
Rudolf Czernoch's 1997 Cagiva
Small enough to fit on a bike with 48V of batteries and it goes 120mph!?
Okay, so making an A/C controller is not THAT hard - we could open-source one in a matter of a couple months. This dude made his own motor, though... how the hell do you do that? If it was 72V it may open more doors, or even a 144v for cars... AC motors don't seem to come in anything but 120v 1-phase or 208/240/480/640v 3-phase. I want options! I envy this guy's bike - he can go super fast and he has a 50mile max range... i only need to go 50km/day. I want.