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- any low cost LC filtering schemes to  improve a gas generator's AC output ?
- any low cost LC filtering schemes to  improve a gas generator's AC output ?
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Old 17th June 2021, 12:47 PM   #11
zigzagflux is offline zigzagflux  United States
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Harmonics and noise in 60 Hz AC systems are NOT synonymous. This generator output will likely have fewer harmonics than your utility feed. Most generators will have less than 2% THD, although their specs typically state 5% since the mfg cannot know what type of loads you connect.

There is no way you will install LC filtering to successfully remove harmonics. The only thing you will accomplish is self-exciting the stator with the huge capacitance you install, and the AVR will lose control as the voltage rises above nominal. Futility, as I noted earlier. I offer to PM you $1000 if you successfully 'clean up' the supposed dirty sine wave.

This also confirms you have no noise, as the unit is a PMG with DC field. Zero noise. Thread will end up going nowhere.
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Old 17th June 2021, 01:53 PM   #12
freddi is offline freddi  United States
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- any low cost LC filtering schemes to  improve a gas generator's AC output ?
thanks all - - The manufacturer says its clean enough:

"Champion portable generators will output an industry standard total harmonic distortion (THD) rating of about 12%-20% depending on load applied. They will produce a sine wave, not a modified or square wave. This is perfectly acceptable for running common commodities found in your home such as TVs, computers, your appliances, etc."

btw, there is this paper which seems interesting:

https://ijournals.in/wp-content/uplo...compressed.pdf

Last edited by freddi; 17th June 2021 at 02:00 PM.
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Old 18th June 2021, 04:06 AM   #13
NareshBrd is online now NareshBrd  India
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There is a field and an excitation winding, so the moving part / armature sees current through slip rings, which is varied to control the voltage in the main (fixed) winding.
Should not be noisy until the slip rings see a lot of wear.

You really should have checked out the circuit and the unit before posting, and if you ordered it, maybe the order can be cancelled, maybe not.
Please remember that in auto applications, a 12V battery has to be charged between 14.2 and 14.8 volts, and the voltage and current can both be varied by the controller.
Many chip makers make the regulator ICs for these applications.
And similar chips / controllers are common in 110/220/440 volts alternators.

So you got what is a fairly simple and reliable machine.

Enjoy.
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Old 18th June 2021, 04:50 AM   #14
freddi is offline freddi  United States
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- any low cost LC filtering schemes to  improve a gas generator's AC output ?
its electric start w. remote so that makes it easier on my kid who is paralyzed on one side.
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Old 18th June 2021, 04:42 PM   #15
NareshBrd is online now NareshBrd  India
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You need this as a fail safe backup?
Anyway, from the diagram it looks properly made.
Take care.
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