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Continuous ratings vs peak ratings are a significant factor, so I think you're correct in that conclusion. Another reason is the power curve. A 200kW EV motor is making that power with a lower torque number and a higher RPM, while a 200kW industrial motor is (in most cases) going to be making that power with a larger torque number and a lower RPM. You can spin a small motor really fast to make power or spin a big motor slower. That's why a lot of EV motors are spinning around 10,000RPM or more at highway speeds with a lot of gear reduction.

As far as continuous loads are concerned, it's all dependent on cooling capacity. If you can keep the motor, controller/inverter, and batteries cool you can run it at peak power as long as you want. That's much easier said than done however.
 
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