What determines the continous ratings of electric motors? - Electrical Engineering Stack Exchange

I've seen variations of this torque-speed curve for brushless DC motor performance, and I'm curious what criteria determine the rated torque and speed of permanent magnet DC motors in general. Does

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Safran's ENGINeUS™ electric motors will fly on the VoltAero Cassio 1 hybrid- electric testbed aircraft - VoltAero

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