Cleaning / Polishing / Dressing Of An Electric Motor Commutator

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Today we show you a way to clean and polish the commutator of an electric motor. The electric motor seen in the video belongs to an electric drill I have found in a crate with its motor opened. I do not know what has caused the grooves on the commutator but they need to be removed for the motor to work properly.
► YOU WILL NEED
- Cleaning rag
- Sponge
- 400 or better, 600 grit Sand paper (aluminium oxide)
- Cleaning gear: Brush / air compressor / vacuum cleaner
► DISCLAIMER
Always make sure you operate in a safe and secure manner.
For this project, take your time, work slowly and check progress.
It is essential to thoroughly clean the motor after polishing the commutator since fine metallic particles left may create shorts in the engine.
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Опубликовано:

22 ноя 2021

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Комментарии : 60

@slomac9177 Год назад

You just saved my ass!! Thought my PTT motor was bad. They are discontinued and was about to drop $500 on a USED replacement motor. Then I watched this video and saw some details that I over looked on my initial rebuild. Broke the motor down again and did everything you taught. Installed it back on the boat and bam💥. I had a better working motor then ever. Thank you so much for this insight! Keep it up!

@TheLabOtomy Год назад

Nice and congrats for fixing it!

@MalaRhynn Год назад

Thank you for the video! I bought a used compressor which has been soaeking, and its sort of my project to leaen about motor maintainance now. All in all youre helping me keep this purchase of mine well and worth it!

@TheLabOtomy Год назад

Nice!

@ehhhh1246 9 месяцев назад

Needed to learn this because the online support for my mini grinder told me to clean the carbon brush, the setting 1 and 2 wouldn't work

@habibithebro7670 4 месяца назад

i subscribed and just left your longest playlist on autoplay. going to buy some supplies. you just saved me 600$. my central vacuum stopped working and this will get it fixe!

@TheLabOtomy 4 месяца назад

Thanks HabibiTheBro!

@mattjones7621 Год назад

Very good! I use a soap stone most of the time and use an air compressor or shop vac to get rid of excess dust.

@TheLabOtomy Год назад

Nice

@muddassirsheeraz Месяц назад

Brilliant

@TheLabOtomy Месяц назад

Thanks!

@happymann839 Год назад

Super 👍👍👍👍👍👍

@TheLabOtomy Год назад

👍

@krislink1761 Год назад

If you stick it in a drill press or lathe, the process goes faster and the finish quality is much better as well

@TheLabOtomy Год назад

Indeed, thanks for sharing

@KeyboardBuster Год назад

@@TheLabOtomy Even better just chuck it up to an adjustable speed hand drill

@TheLabOtomy Год назад

@@KeyboardBuster An option indeed

@mathematiquesinformatique1423 Год назад

merci

@TheLabOtomy Год назад

Merci de votre visite

@georgedennison3338 8 месяцев назад

When you use abrasive on the commutator, stay away from metal based abrasive, particles can embed in the soft copper & damage the brushes. Use a fine stone or fine grit carborundum sand paper; most paper backed wood sandpaper is carborundum, but watch out for aluminum oxide. I generally clean/scrape/undercut the mica between the segments before turning or polishing the commutator. Unless you have a commutator undercutting machine, (if you did, you wouldn't be watching this vid), & undercutting by hand, it is very easy to slip & scratch the commutator. A wood pick will clean the muck out, but if you get down to the mica, it'll take a steel tool to scrape the groove deep enough. If you do the between the segment work first, your slips & scratches can be cleaned up as you turn & polish or polish the comm. Go slow & be careful, tearing up the bare copper insulation or breaking a comm lead will hose the armature.

@BillyCrystal-hc5jp 9 месяцев назад

So I’ve gotten mineral oil down in the commutator and now it smells weird when I’m using. Any ideas on how to get it off? Same process maybe brake cleaner and sandpaper??

@TheLabOtomy 9 месяцев назад

The important is to use products that will not damage the inter-slots mica and / or wire insulation

@BillyCrystal-hc5jp 9 месяцев назад

@@TheLabOtomy thanks sir

@gambiarrautil 9 дней назад

Hello! My 775 DC motor works and after a while it stops. Could this be dirt in the Commutator? I checked other components and everything seems to be normal.

@TheLabOtomy 9 дней назад

Anything at this stage is subject to suspicion

@youngplayboy786 Год назад

I was wondering... 2:17 What if I fill that gap with the help hard glue. Because that method work for only for 1 or 2 months and than cummutator goes fail.

@TheLabOtomy Год назад

The gap ensures slot isolation so is important to ensure the motor works properly

@youngplayboy786 Год назад

@@TheLabOtomy yes.... I'm talking about isolation slot, fill hard glue. Hmm...

@markwilliams2830 2 года назад

Great Video and thanks for sharing.I recently replaced the brushes on my B and Q Angle Grinder .I had to wait 6 weeks to get them from China .The only place to get replacements ! I cleaned up the commutator as per your demo.However in use there is some Arcing in the Brush area.Do you think the Brushes need time to bed in ? As far as I can tell they are moving freely.Thank you again,

@TheLabOtomy 2 года назад

A brush that does make full contact with the commutator can indeed create arcing (which itself can lead to more serious problems, like a brushing breaking). Bedding seems here the logical first thing to do.

@justmadeit2 2 года назад

@@TheLabOtomy How do you bed them in on a washing machine motor ? Ive recently replaced the carbon brushes and notice a burning type smell from the back and sparking noise

@TheLabOtomy 2 года назад

@@justmadeit2 Here is an example of brush bedding vid I made: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-yKyHPpANidA.html Any questions, let me know

@bobbyhutcherson1333 5 дней назад

arcing is normal and should not be viewed as problematic at all. you should see arcing in this type of motor.

@habibithebro7670 4 месяца назад

you showed that you checked the carbon brushes against it. how do i know its good or it needs replacement?

@TheLabOtomy 4 месяца назад

Visual inspection will tell you a lot: no broken parts? Making adequate contact with the communicator? Enough carbon left on the brush? Also, often, issues with carbon brushes will lead to sparking.

@KaitsuMaitsu Год назад

👍👍

@TheLabOtomy Год назад

👍

@shawzhang4498 23 дня назад

would this fix a shorted armature?

@TheLabOtomy 23 дня назад

Nope, it just ensure better contact with the brushes and better energy transfer

@lightshine6044 2 года назад

1:10 What grit is your sandpaper that you are using?

@TheLabOtomy 2 года назад

400 or better, 600 grit Sand paper (aluminium oxide)

@raishadabdul5171 Год назад

my commutator doesnt have those empty grooves, its flush with the bars, do i have to dig inside and make a groove?

@TheLabOtomy Год назад

Yes, google for "mica undercut"

@yabonjin 2 года назад

So WHAT PROBLEMS DOES THIS CONDITION CAUSE? Does the burnishing and grooves cause any reduction in performance of my motor? Does it lead to any failures??? Why should we care?

@TheLabOtomy 2 года назад

Grooves (and more generic uneven patterns on the commutator) mean there are issues with the motor. In our case, grooves can unevenly grind the brushes, which can cause arcing, which further creates gaps and bumps on the commutator, which causes high current to specific parts of the brush, which can cause the brushes to break off, the commutator to be damaged, the windings to overload, an internal short and / or the end of the motor.

@sergiodallagiovanna124 Год назад

Salve amici.... se lo si mette sul tornio... con la carta viene benessimo... Se c'è molto scalino va fatto tornire da uno bravo tornitore con utensile adeguato.... poi smicato e poi carta vera sottilissima per lucidatura. Chiaro che dipende che tipo di lavoro uno vuol fare!

@TheLabOtomy Год назад

Se hai un tornio, è davvero molto più facile! Grazie per il feedback

@sorinpetre6141 3 месяца назад

👍

@TheLabOtomy 3 месяца назад

Thanks

@scolopede Месяц назад

I'm more dangerous. I plug motors into a variac, use electrical cleaner and q-tips as the rotor turns at a slower speed until the copper shines, doesn't take long.

@bobbyhutcherson1333 5 дней назад

those grooves are put there on purpose.

@TheLabOtomy 3 дня назад

Who said they were not?

@bobbyhutcherson1333 3 дня назад

@@TheLabOtomy there is no reason to "fix" those grooves. They're machined in by the balancing system.

@bobbyhutcherson1333 3 дня назад

@@TheLabOtomy ohh, ok. i misread this comment in the description " I do not know what has caused the grooves on the commutator but they need to be removed for the motor to work properly." I thought maybe you were going to do something to remove them.

@TheLabOtomy 3 дня назад

@bobbyhutcherson1333 Indeed, the vertical grooves (on the stacked lamination) are manufactured for balancing and are per design (not the horizontal grooves on the commutator)