"Wes" wrote in message
news
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 looked at the partially marked wires and the data plate and did my best
to figure out it
was low voltage wired. Tip is that 3 wires together. From what I can
see, your normal 3
phase motor has once set of windings internally connected to form a wye.
From there you
either add in series another winding to each leg of the wye for HV or you
build another
wye out of the three other windings and parallel them.

Ohming the windings did not find any shorts to ground. Uncle meter sucks
so I can not
tell if a winding is shorted to itself but not to frame.

My first thought is maybe each wye isn't properly oriented to the other
one.

My second thought is disconnect all the wires, find the three that are
internally
connected and attach power to just those to test the motor. I would think
it would make
it a 2 1/2 hp motor that would get him by for a while.

My third thought is to play with the other 6 wires and make another wye
trying
combinations to see if those can run it.

The forth thought is if I can get set 1 and set 2 to run the motor, try
the 3 arraignments
of paralleling them to get the 5 hp.

Are my thoughts right? Thanks,


Wes

Hi Wes

I guess there are no numbertags on the wires. Thats bad. If there is
a set of 3 wires connected together, that is a good indication that the
motor was wired for its low voltage (probably 220). It is pretty likely
that three of the 6 wires show continuity to the 3 wire junction. That
will make a Y arangement of thoes 3 windings. The remaining 3 wires need
to be *properly* connected to the other three. It isnt easy.
If you feel like getting involved in a motor wiring project, contact me.

Jerry KD6JDJ