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BANGKOK 25 March 2019 15:27
atyclb

Appliance AC motor armature repair

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Appliance AC motor armature repair and perhaps new carbon brushes.  Anyone know a shop that can do this?

 

Motor in question is made in italy and not available locally.

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1 hour ago, atyclb said:

Appliance AC motor armature repair and perhaps new carbon brushes.  Anyone know a shop that can do this?

 

Motor in question is made in italy and not available locally.

The shop locally will rebuild a motor in Non Sa-At, Udon Thani.

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1 hour ago, atyclb said:

bangkok shops?

 

Check out the Ban Mo / Thip Wari Alley area around the Old Siam Plaza. There are guys in the street rewinding Hatari fans I'm sure there will be someone who can re-build your motor.

 

Are you sure the armature is fried? A decoke of the comm and new brushes can make a world of difference. 

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41 minutes ago, Crossy said:

 

Check out the Ban Mo / Thip Wari Alley area around the Old Siam Plaza. There are guys in the street rewinding Hatari fans I'm sure there will be someone who can re-build your motor.

 

Are you sure the armature is fried? A decoke of the comm and new brushes can make a world of difference. 

 

cool thanks. what do u suggest to use to decoke?  any source of brushes?  its a motor inside semi commercial coffee grinder

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Many instructional videos on youtube, solvent, pointy thing to clean the slots, light abrasive paper.

 

For example https://www.youtube.com/watch?v=oB-h-vZc6FY

 

Brushes tend to be standard sizes, have a hunt on aliExpress for something the same size or tout them round Ban Mo.

 

Does it still run?

 

 

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Posted (edited)
6 hours ago, Crossy said:

Many instructional videos on youtube, solvent, pointy thing to clean the slots, light abrasive paper.

 

For example https://www.youtube.com/watch?v=oB-h-vZc6FY

 

Brushes tend to be standard sizes, have a hunt on aliExpress for something the same size or tout them round Ban Mo.

 

Does it still run?

 

 

great video.  

 

runs but seems to have lost torque and starts slower then speeds up.

Edited by atyclb

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18 hours ago, Crossy said:

 

Check out the Ban Mo / Thip Wari Alley area around the Old Siam Plaza. There are guys in the street rewinding Hatari fans I'm sure there will be someone who can re-build your motor.

 

Are you sure the armature is fried? A decoke of the comm and new brushes can make a world of difference. 

 

have isolated motor. will decoke it and clean in general. motor has 2 capacitors. they both appear intact, no bulging, leaking, corrosion.  should i replace them?

 

i cleaned brushes which are spring loaded and appear ok.  

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IMG_20190307_104959.jpg

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The long round things are actually inductors for interference suppression, they should show a short-circuit with your meter. Not a lot to go wrong there.

 

The brushes look ok, maybe a little short (worn). When you put them in how much spring compression is there? I would expect to push them at least 4mm to get the armature in.

 

Do the brushes move freely in their slots?

 

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1 hour ago, Crossy said:

The long round things are actually inductors for interference suppression, they should show a short-circuit with your meter. Not a lot to go wrong there.

 

The brushes look ok, maybe a little short (worn). When you put them in how much spring compression is there? I would expect to push them at least 4mm to get the armature in.

 

Do the brushes move freely in their slots?

 

 

 

yes at least 4mm compression and they move freely.   

 

what is suggested correct lubricant for shaft?

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3 hours ago, atyclb said:

what is suggested correct lubricant for shaft?

 

Those look like sintered bronze bearings. Theoretically they should be impregnated with a special grease (needs heat and pressure). 

 

For a DIY a typical light machine oil (sewing machine oil) should be OK, it won't last as long as original, but it's far better than nothing.

 

EDIT Not a bearing, but the principle is the same.

 

 

 

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With an armature you need to examine to commutator closely, not a girls look, you need a really close examination. Checked all the comm segments and insulated gaps they must all be the same not similar. Colours, widths, depths, heights etc. The face of the brush should be smooth and uniform. Looking at your photos it looks like you need to make a critical look at the comm as it looks like some colour change but it just may be the light in the photo. The brush faces don’t look normal either. It all indicates to me that the comm is coming apart so pretty much your screwed.


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On 3/7/2019 at 6:18 PM, Wirejerker said:

With an armature you need to examine to commutator closely, not a girls look, you need a really close examination. Checked all the comm segments and insulated gaps they must all be the same not similar. Colours, widths, depths, heights etc. The face of the brush should be smooth and uniform. Looking at your photos it looks like you need to make a critical look at the comm as it looks like some colour change but it just may be the light in the photo. The brush faces don’t look normal either. It all indicates to me that the comm is coming apart so pretty much your screwed.


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thanks for thoughts. i looked at the comm closely with a good light and it seems to e ok.  you are right the brush faces were not completely smooth and uniform.

 

now motor is slowing down.  what if i use sandpaper around comm to smooth brush faces?

 

are comm's alone available as replacement parts?

 

Thanks

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