1.

 What is slip?

Answer»

The difference in speed of stator magnetic speed ‘Ns’ (synchronous speed) and rotor speed ‘Nr’ is called slip or absolute slip and it is denoted by the letter ‘S’. 

∴ S = Ns – Nr / Ns. 

Slip has no unit. Percentage of slip of induction motor varies from 4 to 5% in small motors and 1.5 to 2.5% in big motors.

In other words slip ‘S’ = fr / f. Where fr is rotor frequency and f is stator frequency.



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