verify electric motor wiring


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Old 09-16-14, 05:57 PM
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verify electric motor wiring

I have an older(B-Line) 3/4 hp 1ph electric motor I'm looking to use on a project but I would like to verify the correct wiring setup. The faceplate shows both low(115) and high(230) volt wiring diagrams.

I'll most probably wire it to 120 volts. There are 4 wires labeled 1, 2, 3, and 4. From the face plate I'm assuming wires 1 & 3 are joined together and 2 & 4. Then each set wired to a hot and neutral 120V, polarity doesn't matter.

If I decide to go with a 240V circuit that's were I'm a little confused by the face plate. Can anyone tell me how to wire for 240V?

Direction, either CW or CCW appears to be controlled by moving what is referred to as the brush ring and re-tightening the retainer. See photo's.
 
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Old 09-16-14, 06:38 PM
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Just like the diagram shows. For low voltage connect 1&3 to one line lead with 2&4 connecting to the other line lead For high voltage connect 2 to 3 and insulate. Connect 1 to one line lead and 4 to the other line lead.

Must be a repulsion-induction motor. I haven't seen one of those in at least thirty years, maybe longer. They have about the highest starting torque of any single phase motor available.
 
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Old 09-17-14, 08:21 AM
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Thanks for the reply. I just didn't wish to wire it incorrectly.
 
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Old 10-03-14, 08:15 AM
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I wired it for 120V per the diagram, plugged it in and it sits there and hums? Rotor spins freely when there is no power applied but under voltage it is "stuck". I took it apart, polished the commutor, cleaned everything and the brushes look good, etc. I also changed the position of the forward/reverse brush holder but still have the same results, it sits and hums.

Short of taking it to a repair shop(not sure they could fix it) are there any tests that I could perform or any suggestions to get it running. Thanks
 

Last edited by ednu99; 10-03-14 at 08:40 AM.
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Old 10-03-14, 11:41 AM
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Does it have a capacitor? If so, try spinning the shaft to see it will start.
 
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Old 10-03-14, 05:55 PM
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No capacitor. I did get it to run once for a minute or so, but since then nothing. If you attempt to spin the shaft by hand after applying power it feels like it's stuck, as if the magnets are holding it in place.
 
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Old 10-03-14, 06:16 PM
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The motor can be started, stopped and reversed, and the speed can be varied, simply by changing the angular position of the brushes.
 
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Old 10-04-14, 09:34 AM
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"The motor can be started, stopped and reversed, and the speed can be varied, simply by changing the angular position of the brushes."

I realize that. I've moved the brushes in multiple positions but can't get the motor to start. It just sits and hums. If I attempt to turn the shaft by hand it feels like it's being held in place. When not under voltage it spins freely.
 
 

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