Wes wrote:
Wes wrote:

Uncle's 5hp single phase motor for his A.O. Dobbs table saw (big sucker)
croaked on him so he went down to the scrap yard and bought a 5 hp 3
phase motor.


I forgot to mention our first attempt tripped my breaker for my rotophase
(tm) in a few seconds. That is why I'm working on a logical sequence to
test it out.

Wes

Ah, so you don't have real 3 phase power. So you are running it off a 220
V single phase which gives you roughly 220 volt 3 phase so you do need the
low voltage config of the new motor which I assume is a 220 vs 440 range
motor?

My idea of testing relative induced voltages could be messed up (or at
least made even more complex) by the fact that you are using the RPC which
I think doesn't produce equal voltage and power on each phase. But it
seems it should still be possible with enough wire swapping and
voltage/current measuring. SOunds like one hell of a complex puzzle
however. If you are good at solving these sorts of complex puzzles you
should be able to work through it.

As another idea, if you just take 110 single phase power, and apply it to
one winding, and then measure the induced voltages on the other windings,
it might tell you all you need to know about which windings are in phase
and out of phase with the other windings of the two sets. Or to be even
safer, use a 6v or 12v AC door bell transformer and apply that power to the
windings for phase testing? Just some thoughts you should probably ignore
for safety reasons.....

--
Curt Welch http://CurtWelch.Com/
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