Answer Posted / santosh kumar sharma

synchronous motors are not self-starting motors. This property is due to the inertia of the rotor. When the power supply is switched on, the armature winding and field windings are excited. Instantaneously, the armature winding creates a rotating magnetic field, which revolves at the designated motor speed. The rotor, due to inertia, will not follow the revolving magnetic field, but instead acts as a synchronous generator (alternator) and creates a very large counter-current that opposes the rotation

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