Why there is slip in induction motor rotor?

The interface between the rotor current & revolving magnetic flux can generate torque. Thus, according to Lenz’s law, the rotor starts to turn in the direction of the rotating magnetic field. As a result, the relative speed is equivalent to (Ns – Nr) and it is arranged among them to give rise to slip within the motor.

Why synchronous motors are better than induction motors?

The Synchronous Motor can be used for power factor correction in addition to the supplying torque to drive mechanical loads whereas an induction motor is used for driving mechanical loads only. The synchronous motor is more efficient than an induction motor of the same output and voltage rating.

Why does the rotor of an induction motor never catch the synchronous speed?

The Induction Motor cannot run at Synchronous speed because the Slip is never zero in an Induction Motor.

How do synchronous motors differ from induction motors?

The fundamental difference between these two motors is that the speed of the rotor relative to the speed of the stator is equal for synchronous motors, while the rotor speed in induction motors is less than its synchronous speed.

Why does the rotor run at a speed which is always less than the speed of the stator field?

The rotor builds up speed, and as it does so, the relative rate at which the stator field cuts the rotor conductors is reduced. In order that the no-load losses can be met, the rotor attains a speed less than synchronous. When the motor shaft is loaded, the speed falls to increase induced voltage, current and torque.

What is rotor slip?

“Slip” in an AC induction motor is defined as: As the speed of the rotor drops below the stator speed, or synchronous speed, the rotation rate of the magnetic field in the rotor increases, inducing more current in the rotor’s windings and creating more torque. Slip is required to produce torque.