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| AC booster for startup surge (similar to grid-tie) |
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| David Hess:
--- Quote from: jonroger on March 18, 2019, 01:11:49 pm ---I checked and evidently it's hard to find VFDs that will take in 120VAC and output single phase 120VAC. Do such things work well anyway (or do I need to switch to a 3 phase motor (difficult))? --- End quote --- I have seen an awful lot of them used with PSC (permanent split capacitor) motors on small machine tools and they seem to work well enough. |
| NiHaoMike:
Some high end inverters have V/Hz ramp up. It's not hard to do and there used to be a cheap brand of inverters (Vector) with that feature, but apparently they ran into patent issues. (That was 15 years ago or so so the relevant patents probably would have already expired by now.) If it's easy enough to get at the inverter board in your generator, take a picture and that will give clues how easy/difficult it would be to hack it. |
| jonroger:
Does anyone have a link to a 120VAC input, 120VAC output VFD? I can't find a single one. Lots of them for 240V and they say that some single phase motors can just use two outputs of a 3 phase VFD. Independent of practical advice, I think that a small STATCOM or "boost only GTI" is a very interesting design challenge. Doable, but tricky - and evidently hasn't been done by anyone. |
| maxwell3e10:
Interesting challenge. Could one just build a 60 Hz resonant LC circuit to store enough energy? I had a similar problem (starting a furnace blower from an inverter) and ended up using a centrifugal V-belt clutch. |
| jonroger:
I look at a design a bit more and if operated in discontinuous mode (wait for inductor current to drop to zero), control appears to be easy. |
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