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Electric motor

A

Anonymous-0

Well-known Member
I picked up a small electic motot with a gear reduction unit. There is no I D tag or wiring diagram. It has three leads coming out of the motor. How can I tell if it is single or three phase and what voltage it is to operate on? Thanks in advance. J.
 
Just a guess with no diagram or color codes etc., but if theres 3 leads,,,,,,,,none have a connection to the case/frame,,,,,,,the resistance from any one lead to the others etc are all about the same,,,,,,,No kind of any centrifugal switch,,,,,,,,,,,, ID GUESS IT AS A THREE PHASE and further take a guess its single voltage (240 or 480) 3 phase. Darn if I know

John T
 
No electrical expert here, John, but any 3 phase equipment I've seen has four leads. One is neutral. As far as voltage, hp and RPM it's anybody's guess without a plate. You could try an electric motor repair shop. If it's got brushes it could be DC and need a controller.
 
Mike, if its Delta wound I wouldn't see a need for a Neutral, but if its star Y wound I see your point. Any new thoughts???????

John T (Its been over 40 years since I worked for Century Electric Motor Company and Im rusty as an old nail on motors grrrrrrrr)
 
Take it to an elctric motor shop,they can take measurements of the frame and give you a better idea of what horse power it is. With that you can find out what the full load currents should be.
 
Three phase motors do not need a neutral. Ground- yes but no neutral. Three hots and she'll run. Ground so she don't kill ya...
 
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