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I agree with mayes8229 -
The motor weight is (very roughly) proportional to the amount of TORQUE that it can produce
So a Tesla has a 35 kg motor and a 10:1 reduction gearbox to produce the torque that would require a 350 kg motor

On top of that is the time rating - my DC forklift motor is 102 kg - and is rated at 10kw for one hour - it survives 400kw on the track
 
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