"DoN. Nichols" writes:

Don, I was specifically trying to keep it simple and on-topic. The OP's
concern is getting a VFD {or other solution} for his case. I just didn't
want him buying some weird eBay VFD that WAS single phase...because
he assumed "VFD == 3 phase"

Have you *ever* seen a VFD -- on eBay or elsewhere -- which was
single phase output? I haven't, and I think that it because there is
not much benefit from variable frequency with single phase motors.

Nope; but if it existed, someone likely got suckered on eBay....

Again....TMI

Perhaps -- but I find people here like to know the "why" of an
answer, not just the "you can (or can't) do it" type of response.

No dispute, but to me it looked we were swamping the OP with data...


O.K. So to him, the benefit is not having a noisy rotary
converter generating heat between operations. He can leave the VFD on
full time if he wants, and get very little waste power.

Don't know; but he can speak for himself if he wishes...

And how many ram types would do that?

You mean rcm? Quite a few have -- and I first learned about it
from the studies that Fitch (used to be a regular here) posted in a
series of articles as he studied the construction of a rotary converter
for his shop.

OK, I'll take your judgement on same...


And *I* can't get commercial three phase (even though it runs
past about a quarter block from here (you've seen my place -- just up at
the top of the hill there is medium HV three phase passing by)) -- in
part because of town regulations -- which prohibit any hobby machine
tool with a 3HP or larger motor.

Sure you can. It may involve paying off someone ["Motor? Naw, he has a
3 phase electric furnace to heat his basement. Nothing larger than a
clock motor at his house...."] at City Hall or....

Even if I could, the charge from the power company is well beyond what I
can afford -- and they charge industrial rates for three phase -- which
means that they base the charge on the peak current draw during the
month, and you pay as though you have drawn that much full time through
the month.

The other person found that was the case there, too. The 3-phase order
form came with an enema kit disguised as the rate schedule...

Of course, as a big single-phase user; I bet he now makes all his
neighbors lights blink, so the utility will spend $$$ to upgrade that....

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