Motor Speed Calculator
Calculate motor speed from frequency and poles, and estimate slip speed for induction motors. Fast, accurate, and easy-to-use motor RPM tool.
motor frequency calculator
Motor synchronous speed is given with the calculation Ns = 120f/P where f is frequency (Hz) and P is the poles. Reduced motor speed = (Ns) (1-slip).
Formula & Table Summary:
- Synchronous speed: Ns = 120 × f ÷ P
- Slip (%) = (Ns – N) ÷ Ns × 100
- Rotor speed: N = Ns × (1 – S)
Inputs: frequency, poles, slip. Outputs: synchronous speed, rotor speed, slip percentage.
synchronous speed calculator
This synchronous speed calculator figures out the synchronous speed of AC motors based on the supply frequency and poles. The calculation is Ns = 120 f / P, where f is the frequency (Hz ) and P is the poles. In the case of induction motors, there is a small difference between the actual speed of the rotor and the no-load speed owing to slip; this can be calculated using normal percentages of slip of a particular motor, or by entering actual RPM. The tool can assist engineers, electricians, and students in sizing motors, verifying design parameters, and debugging performance. The synchronous speed, the actual motor speed, and the slip percentage are calculated in one location. The calculator works with both 50 Hz and 60 Hz systems, and its pole count has a range of 2-12; thus, it is rather universal and may be used both in industry and in academia. A set of tables of data and formulas helps you find out the most common motor speeds easily and with no mistakes, quickly and without any confusion.
synchronous rpm
| Frequency (Hz) | Poles | Sync Speed | Slip % | Actual Speed |
|---|---|---|---|---|
| 50 | 2 | 3000 | 2 | 2940 |
| 50 | 4 | 1500 | 3 | 1455 |
| 60 | 2 | 3600 | 2 | 3528 |
| 60 | 4 | 1800 | 3 | 1746 |
