2
\$\begingroup\$

We are trying to run an AC generator on an RV for a customer. On an RV as you drive the engine RPM goes up and down. As I understand it, that would change the outlut AC frequency.

Is there an electronic device that I could use to keep the output frequency at a steady 60 Hz?

\$\endgroup\$
4
  • 1
    \$\begingroup\$ Look at "inverter generators" \$\endgroup\$ Jan 8 at 19:34
  • \$\begingroup\$ You could use a DC motor and AC gen with the field current regulated by a tach. Or x kW motor speed control Reference set to line f for high power , or just an electronic x kW inverter. It all depends on the quality of AC sine or square and W/$ budget \$\endgroup\$ Jan 8 at 19:38
  • 1
    \$\begingroup\$ There is a substantial difference in AC quality , impedance and load regulation error in the designs. So estimate specs 1st \$\endgroup\$ Jan 8 at 19:44
  • \$\begingroup\$ Another possibility is to only buy appliances that can handle changing frequency. But since you said this is for a customer, I wouldn't recommend it. Way too complicated. \$\endgroup\$
    – user253751
    Jan 8 at 22:59
0
\$\begingroup\$

If the load is a small one, an inverter from 12V is the best way to go. In fact it's the only practical solution for a varying engine RPM source.

For a larger load, you need a separate generator unit with a fixed RPM.

That said, you can still buy 120V alternators that are belt-driven intended for under-hood generation. They were popular some decades ago on utility trucks as an alternative to a separate gasoline generator. Unfortunately they require a fixed RPM from the engine, so they aren't suitable for an RV in motion.

This company sells them: https://www.fabcopower.com/generat/bgen.htm

\$\endgroup\$
2
  • \$\begingroup\$ We are using a 5000 watt inverter now to do what we want We would have to run more like a 12 to 15,000 watt unit. Which is not practical due to the cost of a good quality inverter We would have about 9 to $10,000 invested. I would like to just run a AC generator off of the engine. I would assume somewhere out there is a controller to control the output and keep it at a steady 60Hz no matter what the output is. I know for instance on our large TIG welders at work when we're doing AC welding with aluminum we can change the frequency anything from about 52 120 hz. \$\endgroup\$ Jan 9 at 1:02
  • \$\begingroup\$ These type of TIG welders also use inverters. They output square waves vs. sine waves used for power inverters. Different animal. \$\endgroup\$ Jan 9 at 3:09

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.