Motor & VFD Speed Calculator
Motor nameplate
n_s = 120 · f / poles. With V/f control the slip in rpm stays roughly constant at constant load torque; slip compensation in the drive corrects the rest.
VFD frequency ↔ speed
Synchronous speeds
| Poles | 50 Hz | 60 Hz |
|---|---|---|
| 2 | 3000 | 3600 |
| 4 | 1500 | 1800 |
| 6 | 1000 | 1200 |
| 8 | 750 | 900 |
| 10 | 600 | 720 |
| 12 | 500 | 600 |
Related
Knowledge· 5
- Reading a motor nameplateDrives & motion
- Variable frequency drive — basics and key parametersDrives & motion
- SINAMICS drive families: V20, G120, G120C, G120X, S120 and V90Drives & motion
- VFD commissioning step by stepDrives & motion
- VFD control methods: V/f, vector, DTC, torque and currentDrives & motion