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What is slip? |
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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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