On 10/28/2010 7:03 AM Mel Knight spake thus:

On Wed, 27 Oct 2010 22:25:03 -0700, David Nebenzahl wrote:

Forget three-phase (and it's generally referred to as 240 volts nominal,
twice 120). Regular old 120 is fine.

Thanks. I'm going to go with 120volts.

One thing confuses me about the "functional" difference of a motor under
120 versus 220 volts.

When I look at the specs for dual-voltage single-phase motors, the
horsepower is the same for both voltages. So is the RPM. The "only" thing
in the specs that's different is the current halves.

What's the "effective" difference in function of a dual-voltage grinder
if it's set up at 115 versus 220? Anything meaningful?

First of all, think 120 and 240. Still dunno why folks use "220".

But to answer your question, there's effectively no difference, since
it's such a small load. If you were talking about a 1-2 horse motor,
then it would be better to run it on 240 instead of 120 (less I^2R
losses at higher voltage). But for your little grinder motor? Don't
sweat it.


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