⚡ VFD Synchronous Speed Calculator
Calculate motor synchronous speed from VFD frequency
Synchronous Speed
1800
RPM
⚠️ Important Note:
*The motor will operate slightly slower than this due to slip. Typical slip is 3-5% for induction motors at full load.
What is Synchronous Speed?
The synchronous speed is the theoretical speed at which the magnetic field rotates. It's determined by the AC frequency and the number of motor poles. Actual motor speed (rotor speed) is slightly less due to slip, which is necessary for the motor to develop torque.
Quick Reference:
| Poles |
@ 60 Hz |
@ 50 Hz |
| 2 Poles |
3600 RPM |
3000 RPM |
| 4 Poles |
1800 RPM |
1500 RPM |
| 6 Poles |
1200 RPM |
1000 RPM |
| 8 Poles |
900 RPM |
750 RPM |
About Motor Slip:
Slip is the difference between synchronous speed and actual rotor speed, expressed as a percentage.
For a standard induction motor: Slip (%) = (Nsync - Nactual) / Nsync × 100
A 4-pole motor at 60 Hz (1800 RPM sync) with 3% slip runs at approximately 1746 RPM.