5th April 2009 07:36 AM
dc motors ?
Hi: Can anyone tell me why a 24volt dc motor I had rebuilt will work on 12 volts but not 24 volts as it trips the fuse. It starts slowing down and overheating immediatly on 24 volts without a fuse.
5th April 2009 07:55 AM
Is it a rewinding? THen probably you've chosen wire with higher diameter than the older one.
5th April 2009 08:00 AM
Yes ,it was rewound. He told me that if it works on 12 volts that it would work on 24, but as I explained,it started smoking and quit within a couple of seconds.
5th April 2009 08:15 AM
You've rebuilt it as a 12V motor!
Try increasing turns. Use same diameter wire as the older one.
5th April 2009 08:45 AM
If you had it rewound for 12v operation why did you try and run it at 24v ?
5th April 2009 09:51 AM
There is a mistake in the direction of winding of one of the poles. A 12v motor will operate on 24v and just have a higher RPM to counteract the higher voltage.
Run the motor on 6v and see if it has a dead spot.
Alternatively, hold the shaft on 6v and turn it slightly while applying the power to see if it has uniform torque.
5th April 2009 10:02 AM
I doubt that would work because the wire probably wouldn't fit on the core.
Originally Posted by forumlicker007
5th April 2009 03:35 PM
Hero, I mean unwind his turns and rewind again using the wire size exactly same as what the original one had. A tight wiring is good. I assume two reasons for the smoke:
1. He has chosen a higher diameter wire so the overall resistance is low which needs extra turns but the core will overflow.
2. His winding might be a loosened one , so he ended up with less number of turns than required.
Start winding the wire from one pole, once finished go to the second one wind on same direction, then to the next one etc. Finally attach the two wire ends together.Suppose you have three poles. You end up with three wire sections in between the poles. Just remove the enamel on the center of the each section and attach to the split ring. Split ring will have three sections.
5th April 2009 04:03 PM
How many poles does it have and how big is it?
Is it a permanent magnet type or a shunt or series type?
If smoke came out its already damages and will most likely need rebuilding again.
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5th April 2009 07:12 PM
The shop new it is a 24volt motor,it says so on the casing. It says max amp 15 with no load. It runs a small hydraulic pump that operates a cylinder for about a 5 second cycle.
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