Motor Synchronous Speed & Slip Calculator
VFD drive setup, motor troubleshooting, checking mechanical motor overload. Calculates synchronous magnetic field RPM, actual rotor RPM, and percentage slip for AC induction motors.
Step-by-Step Derivation ▼ Show Steps
Calculations adhere to standard electrical engineering physics and National Electrical Code (NFPA 70) regulations.
Engineering Principles & Calculations
This calculator uses the exact mathematical relationships between Frequency (50Hz / 60Hz), Number of Poles (2, 4, 6, 8, 12), Measured Rotor RPM (Nr) to determine Synchronous Speed (RPM), Motor Slip (%), Rotor Frequency (Hz). In practical installations, factors such as ambient raceway temperature, harmonic distortion, duty cycle continuous operation, and conductor impedance must be accounted for by a certified electrician.
Calculates synchronous magnetic field RPM, actual rotor RPM, and percentage slip for AC induction motors.
Typical Application & Industry Guidelines
VFD drive setup, motor troubleshooting, checking mechanical motor overload.
Motor Synchronous Speed & Slip Calculator Benchmark Lookup Table
| Stator Poles | 60Hz Synchronous (RPM) | 60Hz Full Load (RPM) | 50Hz Synchronous (RPM) | 50Hz Full Load (RPM) |
|---|---|---|---|---|
| 2 Poles | 3600 RPM | 3450 - 3520 RPM | 3000 RPM | 2850 - 2920 RPM |
| 4 Poles (Most Common) | 1800 RPM | 1725 - 1765 RPM | 1500 RPM | 1425 - 1465 RPM |
| 6 Poles | 1200 RPM | 1140 - 1170 RPM | 1000 RPM | 940 - 970 RPM |
| 8 Poles | 900 RPM | 850 - 875 RPM | 750 RPM | 700 - 725 RPM |