Motor Synchronous Speed
Ns = 120·f / P - fundamental relationship between line frequency, pole count and a synchronous/induction motor's magnetic-field speed.
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Line frequency | Hz | |
| Number of magnetic poles | ||
| Synchronous (field) speed | rpm |
Source: IEC 60034-1 - Rotating electrical machines
In short
Ns = 120\u00b7f / P - fundamental relationship between line frequency, pole count and a synchronous/induction motor's magnetic-field speed.