VFD Frequency & Speed Calculator
Determine the actual motor shaft speed at any VFD output frequency, accounting for slip and operating region (constant torque vs field weakening).
VFD Frequency & Speed
Results
Estimated Output Speed1147 RPM
Output Speed (RPM):1147 RPM
Synchronous Speed:1200 RPM
Speed Ratio (%):78.8%
Output Voltage (V/Hz ratio):~332 V
Torque (at const. V/Hz):~100% (Full)
Formula Used
Ns = (120 × f) / P; Nr = Ns × (1 − slip/100)