My first experience with rewinding a motor armature

In this video I decided to show my first experience with rewinding a faulty motor armature of an old 1994 drill.After disassembling the drill I took the winding data from the armature (winding pitch, stacking direction, number of turns of wire in the coil, its diameter), and determined from which lamella of collector and armature groove the winding begins. In the video I will show the winding diagram and the order in which the coils are stacked. After removing the coils from the armature it turned out that the insulating gaskets melted and the collector was in disrepair because of the high temperature. I made the gaskets from fiberglass on my CNC milling machine and took a used manifold from another defective armature. Almost all the dimensions of the manifolds matched except for the outside diameter, the new manifold was 1.5 mm smaller. I decided that this should not interfere with the motor. After rewinding I did the static balancing of the armature. At the end of the video you will see what the result is.

[ungerspretoria]

The air trapped in the deep grooves of the commutator makes the brushes jump at high speeds, (mini sonic booms!) causing excessive sparks, shortening the life of the commutator and brushes. You also loose a lot of torque on the motor. I usually cut the grooves as deep as possible, clean it up and then fill the grooves with regular White Putty from Pratley. When dry, i level and smooth the commutator surface, and i have a brand new insulation on my commutator that is even and will prevent that nasty thing i mentioned, wearing down with the commutator evenly, (as it wears down over time), making it truly as good as factory new. I also tend to micro-solder the connections on the commutator. Great video, thanx.

[ronnronn]

Congratulations on making an informative video in record time and not having annoying music to distract. Ronn

[jeff]

And, would just one broken wire render the motor useless?

Nice job. You have the patience of a saint.

[timsimpson]

I’ve wound thousands of motors and armatures with equipment from the 50’s, an armature of this size was a 1 hour job and $25 in 1980 including balancing. Today the whole Harbor Freight tool is $25. Good stuff, the motor shop is long gone.

[eamonhannon]

Great job! Very interesting . Should be taught in every electrical engineering class !

[BITTYBOY]

Excellent work - That sparking should get less once the brushes bed in - You did everything right -- 10/10 👍🏻

[buffplums]

This is just brilliant I’ve never felt the inclination or need to do this but if I ever have to, I would certainly have a go. I always envisaged that it was just too much of a fat… but I like the idea of this and it seems something that I could certainly do. Thank you

[rustemsuluk]

Bravo, 40 yıl önce ben de bu şekilde sariyordum. Büyük ihtimalle metabo matkap kolektörü

[ElectromagneticVideos]

Very impressive how you did that with such simple tools and techniques!

[kruvikeeraja]

I Think 1 mistake is not soldering wires on commutator (no good connections) and second, the coils are impregnated with lacquer, not resin. and it is done in a vacuum chamber so that the varnish provides additional insulation and fix wires inside the rotor as well. Hope helps!

[DmitrijNikPavlov]

Да бомба! Классный ротор вышел, аккуратная работа, лайк, подписка! Руки, голова!

[dysfunctional_vet]

was the run out in 10, 000ths, i was impressed by your work

[gopinathannottath]

In my view you could've done the balancing of the armature after finishing the commutator turning. Because the balance disturbed after turning. Quality of brushes also results in spark. Check the Insulation between commutator poles. Its a tedious job you did well. Congratulations ❤

[darylhudson]

I think you need to clean off that copper contact point where the brushes run before you balance it because you're moving material after you've already balanced it

[jlplumley]

Great video. Use high-speed sharp tool
steel
To Cut copper, it will leave less clean out in the grooves.

[andrzejporeda]

Super jest przewinięty ten stary wirnik od stary wiertarki Pozdrawiam serdecznie. 👍👍👍👍👍

[roseelectronics]

It was very satisfying to watch. While lotta work!

[GReddy_M]

great video, i wish you would narrate the video though. It would be so much more beneficial to everyone. what is the brown liquid that hardens on the windings? are those cardboard pieces you laid in the channels of commutator? How come no solder on the little copper pads the winding wraps around?

[jamesmorton]

In the 60s slot car motor rewinding was a big deal. As the field magnetic flux decreases the speed increases. ( It is in the denominator of the equation for angular velocity ). They tended to melt down rapidly LOL. ❤❤

[ЗаПравду-мт]

❤мастер сваих рук
Великаоепная, работа
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