In article ,
Ignoramus25349 wrote:

On Mon, 14 Nov 2005 11:21:41 -0600, Mike Slowey
wrote:
In article ,
Gary Wooding wrote:

A friend has acquired an elderly lathe with a dual-wound 3ph motor. It
has 6 wires going in to it, and is intended for 415v 3ph UK supply, but
he only has a normal single phase 240v domestic supply. He has been told
that he cannot use a single to 3ph VFD with dual-wound 3ph motors. Is
this true? If so, why?

I have a similar problem with a 2hp, 3ph Delta Unisaw motor. I looked
into buying a converter (VFD) and the price (260 plus or minus) was more
than buying a new single phase motor ($245 for 1-1/2hp). Also with the
losses developed with using a convertor, my original 2 hp, 3ph would
probably be no more than the effective output of a 1-1/2hp single phase
motor.

BTW, anybody want to buy a 2hp, 3ph Delta Unisaw motor? Condition
unknown since I have no 3ph power to test it.

Is that a special motor or a regular NEMA frame motor?

i

It is special in that it has the mounting bracket plates welded to the
motor casing, and it has a 3/4" shaft. The plates are about 2' x 3-4",
and 1/4" thich. If the brackets don't get in the way, it should work for
whatever you should need it for. Besides it would be simple enough to
cut them off.

I bought a 2hp, single phase standard mount motor but after I bought it,
I found out it has a 5/8" shaft. If I really wanted to use it, I could
make a mounting plate and make or buy a sleeve bearing to place over the
5/8" shaft to bring it to 3/4" but I'm a little wary of cobbing up such
a thing since the smaller shaft might be snapped off during some rough
usage.

Mike