Correct option is C
Explanation: The difference between the synchronous speed and the actual speed of an induction motor is known as slip.
·
Synchronous Speed: It is the speed at which the magnetic field in the stator of an induction motor rotates. It is determined by the frequency of the supply current and the number of poles in the motor. The formula for synchronous speed
is given by:
where f is the frequency of the AC supply in Hertz, and P is the number of poles in the motor.
·
Actual Speed: This is the speed at which the rotor of the induction motor actually rotates, and it is always slightly less than the synchronous speed due to losses and the nature of induction motors.
What is Slip?
· Slip is necessary for the induction motor to produce torque. If the rotor were to rotate at synchronous speed, no relative motion would exist between the stator magnetic field and the rotor, resulting in no induced electromotive force (EMF) and therefore no torque.
