Authorized Personnel Only - Why We Intentionally Misalign The Slip Rings

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3 жыл бұрын

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Пікірлер: 23

@CodfishCatfish 7 ай бұрын

This makes perfect sense to me. The pantograph on a train is around 4ft wide and to prevent the over wearing in one spot the overhead lines zig zag and the pantograph brush gets worn evenly. This both cleans and protects the cables and also reduces wear on the pantograph collector brush. I can only imagine that if the brush was fixed you would have a groove in the slip ring rather than even wear and the brush also wearing evenly. Only an opinion but I’m sure it’s a similar principle?

@TrapperAaron 2 жыл бұрын

Jesus that was one hell of a disclaimer. I feel like I got suckered into an NDA or a non competition contract against me will.

@kls2020 3 жыл бұрын

I've heard this argument made so many times over the years about the benefit of slip ring run-out . I have never seen literature from any manufacturer that recommends having eccentric slip rings but instead all say to have them as true as possible . When you have the brush working up and down in a brush holder you are basically wearing the graphite off the sides of the brush which can then collect between the brush and holder until it becomes compacted and can jam the brush in place and prevent it from following the collector ring surface . When you also have oil mist coming thru the bearing seal this will mix with the graphite powder and help to make the powder stick where it settles . When you have excessive run-out in the slips it forces you to mount the brush holders higher off the slip ring surface as well . This can also lessen the amount of spring tension available as the brush wears and shortens in length .

@jfbeam 2 жыл бұрын

As with all things, there are trade-offs. Brushes wear - period. So there _will_ be carbon dust. If the brush doesn't move normally, it can become locked in place. As bootsy explains, they've actually had this problem. (over the span of a century, I can't imaging it not happening.) I've not seen this with motors (all of mine are subject to loads of vibration), but I have seen this plenty with gauges. (thus the "standard practice" to thump before reading)

@Cragified 2 жыл бұрын

It depends a lot of environment. This is a hydro plant. That means oxidation is at a higher rate due to the latent humidity in the air. Springs are made of steel and can freeze themselves in place from rust jacking. Things staying stationary a long time are always an issue ask any car mechanic. And even as true as can be it's never perfect there is always runout. This is what pushes the pads of a disc brake away from the rotor when you let off the brake, the very tiny amount of natural run out the rotors have.

@Physicsduck 2 жыл бұрын

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@aleks138 3 жыл бұрын

I was wincing watching your finger get closer and closer. whats the voltage on those brushes?

@Physicsduck 3 жыл бұрын

When the exciter is on, 120VDC at ~100A. At that moment though it was 0VDC, because we had just installed them and were still testing. :)

@rogervanbommel1086 2 жыл бұрын

@@Physicsduck ok, so if you were to touch that when energized, it would hurt, but you would probably be fine right?

@matthewbeasley7765 2 жыл бұрын

@@rogervanbommel1086 Most exciter systems are floating with grounding lights. So if you short it out, you get shocked by the current a light bulb will pass. Enough that it will hurt like heck.

@BillyBoze 2 жыл бұрын

@@rogervanbommel1086 1A can be enough to stop someone's heart for the record.

@TheEmeraldMenOfficial 8 ай бұрын

@@BillyBoze Yes, but that’s assuming high voltage IIRC

@garylozowski1419 8 ай бұрын

Brush holders should be .080” to .125” above the OD of the slip ring for best operation.

@fellpower 8 ай бұрын

That moving is normal. Check the train electric lines, there moving too. to not burn in the current clamp ^^

@MmMerrifield 2 жыл бұрын

Great content!

@nixxonnor 2 жыл бұрын

The groove in the outer slip ring is huge...

@Darklor_WCF 8 ай бұрын

always a bit funny when people say out of round when they mean runout. lol

@rexoliver7780 3 жыл бұрын

On this application the misalingnment is good-the wobble is a GOOD thing-normally I am used to seeing brushes running on aligned communtators or slip rings.

@FunDownSouth 4 ай бұрын

As another commenter mentioned, RPM has a lot to do with this working well for you. Certainly a neat concept though. I’ve seen on multiple occasions where brush swelling appeared to be the culprit of a slip ring / brush melt down. We’ve operated on the principle that these higher RPM and higher current applications (300A+ per brush) can swell in their holders and stick after being subjected to high dosing of contact cleaner. Maybe I need to get one of these brushes and do some testing and measuring to see how true that is!

@garylozowski1419 8 ай бұрын

Slips rings with high TIR or out-of-roundness are usually found on low RPM machines…. Less than 500 RPM. If this were a 3,600 RPM generator; the brushes would be sparking, making noise and wearing away very quickly.

@Physicsduck 6 ай бұрын

Certainly, but down here at about 200RPM it's just fine.