Induction Motor Slip Calculator
About Induction Motor Slip
Slip is one of the most important performance parameters of an induction motor. It represents the difference between the synchronous speed of the rotating magnetic field and the actual speed of the rotor. Slip is essential for torque production in an induction motor — without slip, no relative motion exists between the rotor and the magnetic field, and therefore no induced current or torque.
In practical operation, an induction motor always runs at a speed slightly less than its synchronous speed. The amount by which the rotor speed lags behind the synchronous speed is directly related to the load on the motor.
Formula Used
Slip (s) = (Ns − Nr) ÷ Ns
Slip is often expressed as a percentage:
Slip (%) = [(Ns − Nr) ÷ Ns] × 100
How to Use This Calculator
Enter the synchronous speed (Ns) of the motor, which depends on the supply frequency and number of poles. Then enter the actual rotor speed (Nr). Click the Calculate Slip button to instantly obtain slip in both decimal and percentage form.
Example
Synchronous Speed (Ns) = 1500 RPM
Rotor Speed (Nr) = 1440 RPM
Slip = (1500 − 1440) ÷ 1500 = 0.04
Slip (%) = 4%
Slip varies with load conditions. At no-load, slip is very small (typically less than 1%), while at full load it may range from 2% to 6% depending on motor design. High slip results in increased rotor losses and reduced efficiency.
This calculator is extremely useful for EEE students, diploma candidates, and engineers performing motor performance analysis, laboratory experiments, or troubleshooting motor operation in industrial applications.
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