Why is always the induction motor running with less than the speed of rotating magnetic field?

An induction motor always runs at a speed less than synchronous speed because the rotating magnetic field which is produced in the stator will generate flux in the rotor which will make the rotor to rotate, but due to the lagging of flux current in the rotor with flux current in the stator, the rotor will never reach . …

In which of the following reason induction motor operation is stable?

Low Slip Region of an induction Motor So as the load increases speed decreases therefore to satisfy the load demand torque increases thereby increase in the slip. Hence the graph is in the straight line in nature and this reason is a stable region.

What is the principle behind induction motor and explain its working?

Working Principle of Induction Motor The motor which works on the principle of electromagnetic induction is known as the induction motor. The electromagnetic induction is the phenomenon in which the electromotive force induces across the electrical conductor when it is placed in a rotating magnetic field.

Why does the speed of induction motor is always less than the synchronous speed?

Actual speed of the induction motor will be less than the synchronous speed. The reason for this is if the armature turns exactly at synchronous speed, then the magnetic field of the stator windings no longer cuts the rotor windings. Under this condition, no current would be induced to the rotor windings.

What is the relation of the rotor resistance with respect to the starting torque?

What is the relation of the rotor resistance with respect to the starting torque? Explanation: The rotor resistance is directly proportional to the starting torques. High resistance leads to high starting torque.

Which of the following is the reason of crawling in an induction motor?

Detailed Solution. The crawling in the induction motor is caused by harmonics developed in motor. Crawling is the tendency of particularly squirrel cage rotor to run at speeds as low as one-seventh of their synchronous speed. This phenomenon is known as the crawling of an induction motor.

Why the rotor speed is less than the synchronous speed?

The rotating magnetic field which is produced in the stator will generate flux in the rotor which will make the rotor rotate. But due to the lagging of rotor flux current with respect to stator flux current, the rotor will never reach its rotating magnetic field speed i.e. the synchronous speed.

Why is rotor speed always less than synchronous speed?

The actual rotor speed is always less than synchronous speed so as to produce current in the rotor bars. Two terms are used to define relative motion between rotor and rmf. One of them is slip speed. Slip speed is defined as the difference between synchronous speed and rotor speed.

Why are induction motors referred to as rotating transformers explain its working principle?

The rotor conductors are short circuited, and hence rotor current is produced due to induced emf. That is why such motors are called as induction motors. (This action is same as that occurs in transformers, hence induction motors can be called as rotating transformers.) This rotor flux lags behind the stator flux.