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I don't see what the big deal is with having a drive shaft, it would allow you put the motor in a more protected location, reduce your unsprung weight, use a cheaper motor, use better mechanical brakes (yes, you can skid to a stop with regen brakes, or just by shorting the motor, but I like redundant brakes!) with all of that said, I like that motor design, it's close to what some of the wind turbines are using for an alternator, it's also close to what my bicycle uses for a hub motor, of course with a bicycle like mine it's all unsprung weight!
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