View Full Version : Electric motor wire

09-01-2012, 11:06 PM
I broke a wire inside a electric motor ( I was digging out a mud dobber nest ). I can get to the wire with a soldering iron but I can't get solder to stick to it. Anyone know if I can fix it or is the motor junk now???

09-01-2012, 11:08 PM
If it the enameled winding you need to scrape the enamel off first to reveal the bare copper?

09-01-2012, 11:19 PM
What Max said,also you need to re-insulate the affected area.Liquid tape will work if you don't have any varnish handy.

09-01-2012, 11:27 PM
Yep I scraped the enamel off before I tried to solder it.

Grind Hard
09-01-2012, 11:28 PM
Silly question... did you use flux?

09-01-2012, 11:39 PM
I was trying to use resin-core solder & a soldering iron. I didn't thank you used flux on electric. My understanding is that flux will mess wiring up bad???

09-01-2012, 11:56 PM
Yes, Solder for electronics (resin-core) has its own flux (that's the resin). Plumbing flux is nasty acid and has the potential to bugger things up royally. If the wire is clean copper, and is hot enough, the solder should flow freely on to it. Do make sure you are heating the wire itself, not just the solder.

09-01-2012, 11:56 PM
I was trying to use resin-core solder & a soldering iron. I didn't thank you used flux on electric. My understanding is that flux will mess wiring up bad???

What do you think the rosin in the core is?

09-02-2012, 12:30 AM
Are you sure it's a Copper winding?Lots of Aluminum windings will have a redish pink tint from reflecting the color of the insulating varnish.

You can also use a small un-insulated stake on butt connector to join the ends.Just crimp the joint carefully with some wire cutters and insulate.It only has to make contact and not work loose.

09-02-2012, 12:39 AM
Ah Aluminum!!! I never thought about that... I do believe it may well be Aluminum from the color. How would I go about reconnecting e'm??? I've never tried reconnecting two pieces of Aluminum wire.

09-02-2012, 01:05 AM
Like I mentioned above,a small crimp connector sleeve will do it one sized to fit the wire gauge you have fairly tight.

09-02-2012, 01:20 AM
Its .025 wire. Where would I get a connector sleeve that small???

09-02-2012, 01:56 AM
K&S hobby tubing,ACE hardware here carrys a rack of thier stuff.


If you can find it ,buy the 1/16 OD and a size larger to fit over it,cut it by carefully rolling it under a sharp utility knife blade.

J Tiers
09-03-2012, 10:44 AM
Probably copper ... aluminum wired motors seem to still be rare. But you never know. Aluminum has to be too hot to solder inside

Make sure to get a length of the wire free of the coil..... otherwise the heat will get sucked away into the mass of copper.

09-03-2012, 11:02 AM
There are lots of aluminum wound motors around. Maytag has been using them for decades. They are usually coated with copper coloured enamel which makes them look like copper. The aluminum can be soldered just fine with Bernzomatic aluminum brazing rods and a HOT iron. I have thread on that in the archives. There is also aluminum solder available.


Here is soldering to aluminum using the Bernzomatic rod:


J Tiers
09-03-2012, 11:12 AM
Never took apart any Maytag motors, and didn't know we were talking about that grade of motor......

I'll have to look for the solder threads..... never soldered it with an iron, always had to use a torch. Thank you for the tip.

09-03-2012, 12:05 PM
If the motor is less than 3hp then it's a 50/50 chance it's Aluminum.I helped scrap out several tons of them cleaning up the shop this past spring and that was what we saw.Just about all brands were invloved except for Baldor and US Motors.Dayton however was a major offender.

Transformers were also a major source of Aluminum windings.