Electric Motors
Synchronous Motor Speed Calculator
Estimate synchronous speed with Synchronous Motor Speed. The page keeps the formula, assumptions, and example values visible.
Enter values for synchronous speed
Use one consistent electrical operating case for all fields.
How Synchronous Motor Speed works
The governing expression is Ns = 120f ÷ poles. Synchronous Motor Speed uses Frequency, Motor poles to report Synchronous speed.
With the loaded values, synchronous speed evaluates to 1,500.00 rpm. Test one input at a time and save the original case.
Inputs for Synchronous Motor Speed
Frequency and Motor poles belong to Synchronous Motor Speed. Keep source units with frequency.
Sample entries show the formula in use. They are not substitute ratings for selected equipment.
- Frequency
- Example entry: 50 Hz.
- Motor poles
- Example entry: 4.
Reading the Synchronous Motor Speed result
This output represents Synchronous Motor Speed.
A numerical answer cannot replace the rating and protection checks for the real equipment.
Measurement and units
Motor nameplate data, duty, enclosure, starting method, load profile, and thermal limits govern final selection. Check prefixes on frequency.
A fair comparison keeps units, measurement point, and operating condition consistent.
Limits of this calculation
Pole count must be an even integer.
The calculation focuses on the named relationship and its entered variables. Unentered effects remain outside Synchronous Motor Speed.
Synchronous Motor Speed record notes
Record source and operating details for frequency. Use VFD Motor Speed Calculator.
Retain raw synchronous speed beside its selected rating.