Question III.c: What do you mean by the slip of an induction motor?
What do you mean by the slip of an induction motor?
An induction motor rotates at a speed less than the synchronous speed, i.e. the speed of the rotating magnetic field, N_{s}. If the rotor speed is N_{r}, then the difference between N_{s} and N_{r} is called the slip, S. Slip S is expressed in percentage or per unit.
Percentage slip, S =\frac {(N_{s} -N_{r})}{N_{s} }×100
Normally, the slip varies from 3 to 5 per cent.
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