Machine mods, oddities, and fix-ups #18: Motor winding connective wires, smoked

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Blog entry by Loren posted 01-17-2015 08:14 PM 1347 reads 0 times favorited 3 comments Add to Favorites Watch
« Part 17: SCMI stroke sander demo Part 18 of Machine mods, oddities, and fix-ups series no next part

Here’s part of a European c-face motor with damaged connective
wires coming off the winding. It’s rather a proprietary sort of
arrangement powering a slow-speed gearbox, so I have to figure
out how to repair the wires or have the core rewound. Ugh.

3 comments so far

View Jerry's profile


1710 posts in 1071 days

#1 posted 01-17-2015 08:23 PM

That’s an expensive proposition. You might want to consider just buying a new motor it might be cheaper in the long run.

-- There are good ships and there are wood ships, the ships that sail the sea, but the best ships are friendships and may they always be.

View EEngineer's profile


1054 posts in 3036 days

#2 posted 01-18-2015 12:44 AM

I opened your picture in a separate window and blew it up. It looks as though the only thing damaged are the connecting wires. I see no evidence of overheating or degradation of the varnish on the actual motor windings. If (and you really need to check this) that is the case, then the solution might be simple. At a minimum, I would do a quick resistance check from the motor windings to the case of the motor to make sure the varnish insulation hasn’t broken down.

I have repaired damage like this to a motor. I walked the connection back to where it connects to varnished wire from the windings and replaced the degraded wire. A good solder joint and some shrink tubing and it was good to go again. I think that one is still running in my shop.

I would be concerned about why that wiring failed in the first place. In my case, it was just old age and failure of the insulation on the connecting wires. Is that round black thing to the lower left of your motor a capacitor? If so, then maybe failure of that cap led to overheating and destruction of the wires. Without a circuit diagram or some idea of what the hell they are actually doing with the motor, it is impossible to gauge the success of just replacing the bad wires.

-- "Find out what you cannot do and then go do it!"

View Loren's profile


8168 posts in 3070 days

#3 posted 01-18-2015 02:02 AM

Well, that’s good news. As a European format c-face motor
with an 11mm spindle finding an affordable replacement
could be rather tricky.

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