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How do you remove the windings from the armature of an AC motor? Answered

I am stripping an AC motor for the useful magnet wire. The field coils are pretty straight foreword to remove, however, I have no clue how to unwind the wire from the armature. I don't even see where the wire starts. If someone could provide me with some basic steps to get the job done, that would be great. :)



Best Answer 5 years ago

The most you could pull out of that armature as a single magnet wire
( looks like a ten or dozen slots & commutator bars ) is one coil at a time,
which is many wraps of the wire you want.
Then the next coil starts at a commutator bar.
Of course you have to be very careful at avoiding iron edge nicks in pulling
the top and subsequent coils out of the armature iron slots

When the armature is made the wire is passed over a U bent copper extension of each commutator bar..
At the end of a coil winding the wire is  passed over the next U extension,
While the last extension is mechanically pressed flat and spot welded.

Your biggest problem is how to release the varnish impregnating the
wires used to lock them in place from moving.
You do understand, each wire is under the stress of rotating and pushing
against the armature iron to force the shaft into rotation.
The only practical way I know how to get the varnish off is heating and
burning it off.

But I read you have successfully removed field coil copper that indicates
have you solved the varnish situation.


Here are some pictures of the "U" bar for wiring an armature commutator.


A modern motor is often filled with epoxy resin under a vacuum - these are impossible to dismantle.

Don't bother unless it's absolutely you only choice. Wire in a motor is "glued" in much tighter by shelac or lacquer and it'll be very hard to get out without breaking. It has to help hold the wire in place while the motor is turning. A much easier job is taking apart old transformers. They are not usually so heavily coated since they don't have the stress of rotation.

Peel out the grey strips that cover the slots, and then you might be able to get the wires out. The ends are soldered to the commutator at the right of the picture.