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Common industrial AC induction motors have a pretty bad power to weight ratio compared to commen DC motors, I think. However, if it's possible to drive them with a higher frequency than 50/60 Hz then maybe they can produce more power (if the torque doesn't decrease too much with RPM).
How high much can you overrev a typical 3-phase AC induction motor before it breaks apart? at which RPM does the power curve start to decrease due to the torque curve falling too fast?
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