Electronics > Repair
Problem with air compressor pump motor
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shockpoint:

--- Quote from: Gyro on May 16, 2024, 07:35:22 pm ---Note that most of those Chinese clones of the Hyundai low noise compressors use CCA (copper clad aluminium), rather than copper wire, for their windings. As a result, they run hotter and are prone to failure. Pay particular attention to any joints you find in the motor and be careful not to accidentally strip the [copper] cladding off the wire, otherwise it will be impossible to achieve reliable connections.

--- End quote ---
Thanks for the tip - I did notice this in stripping a single phase fan motor. Which brings me to the question - How do you reliably remove the varnish without removing the copper cladding? Typically for copper wires I just sandpaper with 1000 grit but with copper cladded alu I'm not so sure


--- Quote from: andy3055 on May 16, 2024, 06:41:14 pm ---You might have to open the motor and take readings direct from the windings as there can be an overload device of some sort on the 1/2 winding. That will actually give you a clue how it was wired to begin with. Just make notes and take pictures at every stage.

--- End quote ---

I suspect a thermal fuse from the common side of the motor might have blown. I have spent the last 2 weeks stripping a fan motor and I've learned quite a lot! Now going back to the compressor motor, hopefully nothing requiring a full re-wind.
Gyro:

--- Quote from: shockpoint on May 27, 2024, 02:07:21 pm ---
--- Quote from: Gyro on May 16, 2024, 07:35:22 pm ---Note that most of those Chinese clones of the Hyundai low noise compressors use CCA (copper clad aluminium), rather than copper wire, for their windings. As a result, they run hotter and are prone to failure. Pay particular attention to any joints you find in the motor and be careful not to accidentally strip the [copper] cladding off the wire, otherwise it will be impossible to achieve reliable connections.

--- End quote ---
Thanks for the tip - I did notice this in stripping a single phase fan motor. Which brings me to the question - How do you reliably remove the varnish without removing the copper cladding? Typically for copper wires I just sandpaper with 1000 grit but with copper cladded alu I'm not so sure

--- End quote ---

Good question. I've not done it, but I would think either carefully applied heat, or solvent. Something like polyurethane will burn off well before the Alu, but I've seen videos of CCA melting really easily in a lighter flame. Maybe hot air. Otherwise some sort of paint thinner? It all depends on the composition of the insulation.

You might get away with careful abrasion, I don't know how thin the copper layer of CCA is (and how much it varies!).
andy3055:
If you are unable to solder, you can always crimp it to a copper "pig tail" and use that wire to make the necessary solder connections. Your first problem will be to make sure the individual windings are still intact.
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