Formulas used
- Ns = 120 x f / P
- Slip s = (Ns - N) / Ns
- Rotor frequency = s x f
Frequently asked questions
What is a normal slip?
Most induction motors run at 2 to 6 percent slip at full load. Larger motors have lower slip.
Why is a 4 pole motor about 1440 rpm?
A 4 pole motor on 50 Hz has a synchronous speed of 1500 rpm. At about 4 percent slip the shaft runs near 1440 rpm.