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Motor synchronous speed calculator
Enter the electrical frequency and number of poles to calculate Ns = 120f/p.
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Frequently asked questions
What's the formula?
Ns = 120f/p.
What does Ns mean?
The synchronous speed of the rotating magnetic field.
Why is an even number of poles used?
Conventional AC motors are described in terms of pole pairs.
Does an induction motor run at exactly Ns?
Usually not. It rotates slightly slower under load.