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Faunsdale, AL | Sounds like the generator is belt driven while the well is direct drive.
Hopefully your generated voltage gets to 480 right around 60 Hz. That’s turning a 4 pole generator 1800 rpm. This is important since motors turn rpm related to their number of poles at 60 Hz. 2 pole motors turn about 3500 rpm, 4 pole motors turn 1750 etc. The motors are designed to run coolest when supplied with volts per Hz in a narrow range depending on how they’re wired.
When you run the generator rpm too high (Hz) to bring the voltage up to nominal (480 in your case) the motor suffers from excess heating. Most general purpose motors are rated to operate on 460 volts AT THE MOTOR. So you might not have to actually run it as fast as you have been unless the length of the feeders to the motors drops the voltage too low if you don’t start out at 480.
If your generator is running at the correct frequency when you have the engine at 2300, but you don’t need to run the well that fast, either change the pulley ratio to speed up the generator rpm or change the gear ratio driving the well. I think that’s normally done by changing the gear ratio in the well head gearbox. Adding a transmission between engine and well head may change direction of rotation.
Edited by ccjersey 4/1/2026 14:34
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NAT Irrigation engine question
