I bought for $5 an almost new looking 1 hp motor from a garage sale.
From the Specs plate it looks like a 120Vac 3 phase motor. Is there
such an animal? How do I wire one up wth the regular household plug?
There is such an animal. Used them in industrial greenhouses, they were
more reliable than single phase during brown outs and the like.
How to wire it up to your home? If you don't have three phases pumped
into your house (and I don't know of anyone who does) then you don't. In
theory you could wire up one phase, leave the other two phases out of the
equation. It will work, but will probably burn out over time.
Suggestion: Go find a single phase 120Vac motor for $5 at another garage
sale. Or check out people tossing old washers & dryers. The motors are
often just fine in those beasts.
he can't get 3 phases to a residential area because the netwqork itself only
brings one phase to an area, then splits it into 2 phases with a center-tap
but why would he need a transformer to bring it down to 120V? we get 120V
per phase in Canada.
oh, right, I thought he meant he would need a transformer to bring the
normal residential line to 120 V (since residential areas don't get
industrial voltages, using a transformer didn't make sense to me)
That may be true were you are but it is untrue in many places. Many
utilities will provide 208/120 volt wye connected three phase service.
It is an especially common service to large apartment houses. Since the
US NEC forbids luminaires that require voltage over 150 in dwellings the
480/277 volt three phase service is of little use in such buildings.
I'll tell ya.
The 2 "phases" as you call them are not phases at all. Each is derived from the
same primary phase. There is however, relative to their reference to neutral,
240v difference between them.
You know between either 1 or 2 and N you get 120v, and between 1 & 2 you get
240. Now add a tap at the (*) and say that's 60v to (n) - it would also be 60v
from * to (2) and 180v between * and (1).
Now, would this be a 3-phase transformer? No, and that's why these kinds of
services are called single phase 120/240.
One of my old customers there sure as hell did.
We went to replace his old AC unit, and be damned if he didnt have 3 phase
hitting the board....
Turns out, that everyone on his block was like that...and it was
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