On 2008-11-06, Robert Swinney wrote:
Iggy sez: "That motor would make a great converter to run a big welder."

Right on, Iggy. Consider though, if used as a RPC to power (1.5 x
40) = 60 HP full load, it would take wiring based on a minimum of
320 amps, probably more to meet code. That figure based on 60 HP of
motors running on single-phase 220, at 80% pf and 80% eff. The
idler motor alone spinning unloaded, as in a RPC, would draw 20 amps
or so.

The full load is 40 HP divided by 1.5, not multiplied.

My 17.5 HP phase converter draws approximately 40 amps single phase
under some loads. Figure a three times bigger number, it is a
manageable 120 amps.

A 40 HP motor, plugged into three phase 240, should draw approximately
3.4*40, or 136 amps. As a phase converter, it should draw a comparable
amount from its input before it would overheat its windings.

Tom's motor may be less efficient than that if it is that old.

i
Bob Swinney


"Ignoramus31261" wrote in message
...
On 2008-11-06, Buerste wrote:
Anybody need a 40hp 3-ph motor for a bench grinder, drill press or such? It
might take some adapting. I'm finally dismantling my dust collection system
not that I get all my blocks made elsewhere. The 40hp powered the 48"
blower connected to the bag house outside. The little bit of woodworking we
do now has small 1hp collectors on each shaper. Gee, for some reason my gas
bill is 1/3 of what it was! I figure the 40hp costs about $12/hr to run so
it might not be cost effective for a bench grinder but it sure would keep a
6" wheel turning when you bear down on it!

We put it on Craigs list for $850 but I sure would take a lot less.

My guess is that you will get $400 for it. I have a nice collection of
motors already, going up to 10 HP (call me a wimp if you want). --
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--
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