Discussion
A synchronous motor runs at
Answer: A
Correct answer: exactly the synchronous speed of the supply
The rotor field is locked to the rotating stator field, so the machine turns at
\[ N_s = \frac{120f}{P} \]and at no other speed, whatever the load. Increasing the load does not slow it; it merely increases the torque angle by which the rotor lags the stator field. This constancy is the machine’s defining property and the reason it is used where speed must be exact. Running a few per cent below synchronous speed describes the induction motor.
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