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Old 22nd December 2012, 05:00 AM   #31
benb is offline benb  United States
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Quote:
Originally Posted by gmaslin View Post
DF96
I'm glad we are beginning to understand each other. Noise on the source A is negligible if that is what you mean. I'm assuming that you would approach this with a logical gate controlling a heavy duty rheostat. What would you use to sense the current with this configuration? I didn't find a 20kW rheostat but if I do, what percentage power loss should I expect through this type of servo? Which of the two roads offered will be more efficient and which more economical?
Oh my ... I don't think you'll find one of those. It would be too inefficient. The fans to keep it cool would be huge and take a lot of power. What you would need (perhaps, if I halfway understand, which I suspect I don't), is a 20kW Variac (TM, brand name of variable autotransformer), and I doubt those are made anywhere near that large. It would also take a large, powerful servomotor to rotate it in half the cycle time of a 60Hz wave.

I dare say that any project that needs anything approaching a "20kW rheostat" is beyond the DIY capabilities of most here, both in terms of safety and cost.
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Originally Posted by DUG View Post
I'm still in.

As I said, I like a challenge.

Even if only to suggest a concept.

But, I'm still in.
Usually the challenge is technical, though sometimes the challenge is with language, which admittedly I'll have some respect for a poster with bad English, as he surely knows English as a second language much better than I know his first language (though I do hate seeing u for the word you and such - I consider that laziness). But this challenge is something else.

Good luck, DUG.
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Old 22nd December 2012, 05:11 AM   #32
benb is offline benb  United States
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Originally Posted by jameshillj View Post
Curiously, does this "the cyclo-converter thread" have another name?
That appears to be this thread:
line frequency conversion
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Old 22nd December 2012, 06:24 AM   #33
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Ah, so that's what it's all about. Not really much to do with Audio at all, at all.

I'm looking to re-purpose an electrical generator that outputs 5A three phase 500VAC @1kHz to 125VAC @60Hz

So, 500volts, 5A, 1kHz (?), 3 phase, no power factor correction/conditioning, etc ... Jeez!

DUC, I don't think you get to take that prize home after all!
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Old 22nd December 2012, 06:37 AM   #34
AJT is offline AJT  Philippines
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moved thread.....keep things civil guys....
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Old 22nd December 2012, 06:38 AM   #35
Mooly is offline Mooly  United Kingdom
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I've pulled some of the more insulting posts off here. Keep to technical discussion related to the topic and cut the personal stuff.

Which leads on to this...

gmaslin. Unless you are prepared to explain in simple terms what you are trying to achieve or what this "academic question" relates too, then this thread will be closed.

Dug... I've deleted your "wrong thread" post/s
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Old 22nd December 2012, 10:56 PM   #36
AJT is offline AJT  Philippines
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@gmaslin, any chance you are affiliated with Sterling Allan?
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Old 3rd February 2013, 09:52 PM   #37
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Did the mystery of what the original poster was making here ever come to light?
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