Why slip in induction motor

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Read More. Subscribe Here! All Posts. A very efficient way to control slip is to use a variable frequency drive The correct answer is B , "difference between speed of stator field and rotor speed. Joel Don Joel Don is an independent content marketing, social media and public relations consultant. Definition: In Induction Motor, a slip is a speed among the rotary magnetic flux as well as rotor expressed in terms of for every unit synchronous speed.

So, slip can be determined as. In this motor, if the power supply given to the 3-phase stator winding is a 3-phase, then a revolving magnetic field can be generated within the air gap so this is known as the synchronous speed.

This speed can be determined with the no. This magnetic field which rotates will cut the inactive rotor conductors to produce e. Because the circuit of the rotor will be short-circuited, and the emf which is generated will raise the current supply of the rotor.

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. So there is no motion among the coils of the rotor as well as revolving magnetic flux. So, there is no flux cutting act in the rotor coils. Therefore, emf will not be generated within rotor coils for generating rotor current.

So this motor will not work. So, this is possible only when the rotor within the motor is turned in the revolving magnetic flux direction using the prime mover. This is only possible when the rotor is turned in the direction of revolving magnetic flux by some prime mover. In this condition, the motor operates as an induction generator. If the slip value of the motor is greater than one then the rotor will turn in the opposite direction to the revolution of magnetic flux.

Hi friends, in this article I am describing the importance of slip in induction motor and hoping you will find it informative and useful. In the induction motor rotor always rotates speed less than synchronous speed. The difference between the rotor speed N and the rotating magnetic flux speed N s is called slip.

The induction motor slip is usually expressed as a percentage of synchronous speed N s and is represented by symbol s. Slip of induction motor plays an important role in the operation of the induction motor.