Discussion
True or false: an induction motor can run at synchronous speed.
Answer: A
Correct answer: False, since no relative motion means no rotor current and no torque
At synchronous speed the rotor turns with the field, the conductors cut no flux, no emf is induced, no rotor current flows and no torque is produced. The machine cannot even overcome its own friction there, so it always settles at some slip. This dependence on relative motion is why the machine is called asynchronous. Only if the rotor is driven above \( N_s \) by an external prime mover does it pass through that point, and it is then generating.
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