Need Help!- Wiring a (hybrid?) one/three phase AC motor.

[Walky]

I have an old AC motor which belonged to my grandfather (which passed away some years ago), and I'm having a hard time figuring out how to make it work.

It's a three phase motor, but it seems it's some kind of hybrid, since I know this was at one time wired directly to one phase mains (no converter). My general AC knowledge is very limited, and my understanding of three-phase motors and wiring is absolutely none.

I need to wire it to one phase mains.






(sorry for the picture quality, just took the motor out yesterday and only had the phone's camera at the shop).

The three upper binding posts are labeled X, Y and Z. The joined bottom posts are labeled U, V and W. Hope that gives a clue.

I'll be very grateful about any help I can get about this, this motor seems like a nice candidate for a lathe build, and also has some emotional value so I'd rather give it a good use instead of just letting it rust in a corner.

Thanks.

[Al_The_Man]

Does it have any kind or brushes or slip rings that you can see?
Or if a polyphase motor, it is designed to run on 3ph or 2ph but not 1ph.
Al.

[Walky]

I'll take a flashlight to the workshop next time and check if I can see anything through the front or back vents. The info plaque shows 3-phase delta/star configurations (I think the current one is star), so maybe it was internally modified by a third party?. Is that common or even possible?

Thanks!

[Al_The_Man]

If that old it might be worth taking it apart and cleaning anyway and also fit new bearings while your at it!.
Al.

[MR.20C]

Originally Posted by Walky I'll take a flashlight to the workshop next time and check if I can see anything through the front or back vents. The info plaque shows 3-phase delta/star configurations (I think the current one is star), so maybe it was internally modified by a third party?. Is that common or even possible? Thanks!

Tag says 220/380 ,......


You say he ran it off single phase 220, how is that possible ? I recently had an experience with this. My Oliver 88D from 1929 was originally manufactured as a 440vlt 5hp/3Ph motor, manufacturer -woods motor , well,... The tag is stamped (over stamped) 220 but everything else on the tag was left ,Inc the amps...6.9..

Go figure.

B,

[Al_The_Man]

Originally Posted by MR.20C You say he ran it off single phase 220, how is that possible ? Go figure. B,

I agree, that is why it would be nice to find out the exact construction?
I would guess it is a simple 3ph star/delta motor?
Al.

[Walky]

Well, it seems I now have something interesting to do during the 70+ minutes cutting job I need to do tomorrow, I'll disassemble it and hopefully take some (decent) pictures of the innards.

[Al_The_Man]

Originally Posted by Walky , I'll disassemble it and hopefully take some (decent) pictures of the innards.

I just took my grandson on a tour of the local Electrical Museum, I'm sure there was one of those there!
Al.

[Walky]

Originally Posted by Al_The_Man I just took my grandson on a tour of the local Electrical Museum, I'm sure there was one of those there! Al.

Was it one-phase?

Just kidding

[Al_The_Man]

No but there was one of Edison 6kw dynamo's!
Edison 2.5KW Dynamo - SmokStak
Al.

[Walky]

Originally Posted by Al_The_Man No but there was one of Edison 6kw dynamo's! Edison 2.5KW Dynamo - SmokStak Al.

That's a nice to look motor, I guess the 6kw version must have a considerable size?

Well, here are some pictures of my motor:

http://img546.imageshack.us/img546/8273/motor1large.jpg
http://img440.imageshack.us/img440/8223/motor2large.jpg
http://img811.imageshack.us/img811/4889/motor3large.jpg
http://img32.imageshack.us/img32/3955/motor4large.jpg

The front bearing is stuck, which is a surprise since the shaft was turning. It seems unlikely that it got stuck when opening the motor, so I guess the whole bearing was sliding on its pocket. I don't have proper removal tools so I'll have to improvise on that. It will take some time to clean the motor, it was full of dirt (at least no spiders came out to say hello).

This isn't looking too promising on the one-phase issue, though.

[Al_The_Man]

Yeah, definitely showing its age!
So far everything looks like the 1ph is out?
Al.