Question

Why 3 phase induction motor cannot run at synchronous speed?

Answer 1

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the source for the torque in a three phase induction motor is the slip.and slip energy is caused due to the difference in speed of the rotation of stator flux wave and

the source for the torque in a three phase induction motor is the slip.and slip energy is caused due to the difference in speed of the rotation of stator flux wave and the rotor.where the former rotates in synchronous speed.as a result emf will be induced in the rotor and which as per

synchronous speed.as a result emf will be induced in the rotor and which as per lenzes law will try to oppose the cause of the emf here which is relative speed .the rotor now tries to catch the stator flux wave.if it runs in synchronous speed means there is no relatyive speed and no slip energy and no torque and hence the motor will stop.

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