Q.1. Why is it called synchronous motor?
Ans. Therefore the rotor rotates at the same speed that of the rotating magnetic field. It is due to the reason the motor is called as synchronous motor. It is a constant speed motor runs at the same synchronous speed.
Q.2. What are the reasons if synchronous motor does not start?
Ans. The stator carries winding connected to an AC supply to produce a rotating magnetic field. At synchronous speed the rotor poles lock to the rotating magnetic field, because of the constant magnetic field in the rotor these cannot use induction windings for starting. Synchronous motors are inherently not self starting.
Q.3. Define pullout torque?
Ans. The pullout torque is the torque, beyond which the synchronous link between field poles and resultant flux wave is severed and the machine falls out of slip.
Q.4. What is the speed regulation of a synchronous motor?
Ans. Speed regulation of synchronous motor is zero. As we know synchronous motor running at the constant synchronous speed so running speed is synchronous speed therefore there is no speed loss so the speed regulation of synchronous motor is zero.
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