View Full Version : identifying motor

01-17-2013, 10:01 PM
Hey all,

I just got a new lathe. Quite an experience getting it loaded and moved home.. but now that it's here, I've got to figure out the power situation.

The motor that's in it has no markings on it whatsoever - no data plate and no stampings that I can see.

The cable wired into the motor has three wires plus a ground, all connected to motor wires; however, the PO had it wired to what appeared to be a single-phase service connection with only two hot wires.

There are two caps on the motor, but they're housed inside the wiring box.

I did wire it to a 220V single phase outlet and it starts and runs fine, but I haven't attempted to make a cut to see if it's lacking power. There is 115V between the third supply wire and ground.

Does anyone know how to identify whether or not this is a 3 phase or single phase motor, and what its voltage rating is? I'd love to run this lathe on 3-phase but will run it on single phase if it requires it. Maybe a good tutorial on tracing windings or something?


01-18-2013, 04:36 AM
Single phase, probably capacitor start - capacitor run (two capacitors).