- Motor slip is necessary for torque generation
- The stator structure is composed of steel laminations shaped to form poles.
- The rotor is another assembly made of laminations over a steel shaft core.
-In actual operation, rotor speed always lags the magnetic field's speed, allowing the rotor bars to cut magnetic lines of force and produce useful torque. This speed difference is called slip speed.
- Slip also increases with load and is necessary for torque production.


- Slip depends on motor parameters
The formal definition of slip is:
S = (ns - n) x 100 percent/ns , where
ns = synchronous speed
n = actual speed

- At low values, slip is directly proportional to the rotor resistance, stator voltage frequency and load torque, and inversely proportional to the second power of supply voltage.


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