Generator Voltage Calculator
Calculate generator output voltage from flux, speed and winding turns.
About Generator Voltage Calculator
Induced EMF is proportional to flux, frequency and turns. Because voltage rises with frequency at constant flux, a machine designed for 50 Hz produces 20 per cent more voltage at 60 Hz unless excitation is reduced. The volts-per-hertz relationship is why generator and transformer designs are frequency-specific and cannot simply be swapped between regions.
Formula
Generator Voltage
E = 4.44 k_f f Φ N per phase
- Φ
- Flux per pole in webers
- N
- Turns per phase
- k_f
- Winding distribution factor
Worked example
With the default values below, Generator Voltage Calculator returns Phase Voltage of 639.36. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Turns per phaseminimum 1
- 120
- Flux per poleminimum 0 Wb
- 0.025 Wb
- Output frequencyminimum 1 Hz
- 50 Hz
- Winding form factoraccepts 0.5–1
- 0.96
Results
- Phase Voltage
- 639.36 V
- Line Voltage in Star
- 1,107.40 V
- Volts per Turn
- 5.3280 V
- Turns Needed for 400 V Line
- 44
- Phase Voltage at 60 Hz
- 767.23 V
Step by step
- 1Values used
- 2Generator Voltage
- 3Phase Voltage= 639.36 V
- 4Line Voltage in Star= 1,107.40 V
- 5Volts per Turn= 5.3280 V
- 6Turns Needed for 400 V Line= 44
- 7Phase Voltage at 60 Hz= 767.23 V
Assumptions and limits
- The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax or fees or charges into account.
- Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Generator Voltage calculated?
E = 4.44 k_f f Φ N per phase Induced EMF is proportional to flux, frequency and turns. Because voltage rises with frequency at constant flux, a machine designed for 50 Hz produces 20 per cent more voltage at 60 Hz unless excitation is reduced.
Why does Generator Voltage matter?
The volts-per-hertz relationship is why generator and transformer designs are frequency-specific and cannot simply be swapped between regions.
What values do I need to enter?
This calculator takes 4 inputs: Turns per phase, Flux per pole, Output frequency, Winding form factor. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.