Induction Motor Slip
Slip s = (Ns − N) / Ns - the fractional difference between synchronous and rotor speed. Directly proportional to rotor losses and torque.
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Synchronous speed | rpm | |
| Rotor speed (shaft) | rpm | |
| Slip |
Source: IEC 60034-12 - Starting performance of rotating motors
In short
Slip s = (Ns \u2212 N) / Ns - the fractional difference between synchronous and rotor speed.