AC clutches are weird

"nFamousCJ - Keeper of Stringbean, Gengars and a Deezul" (nfamouscj) 01/02/2020 at 18:04 • Filed to: None

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Why does it look like it has moving parts but presumably doesn’t?

Also how long do you leave up Christmas decorations? I’ve always gone by the “leave them up and on for New Year’s Day - then tear it all down Jan 2". But all my neighbors still have theirs up and on. Am I missing something?

jimz > nFamousCJ - Keeper of Stringbean, Gengars and a Deezul 01/02/2020 at 18:11

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it sort of does, the rings are “springy.”  the pulley spins all of the time driven by the accessory belt, and when the A/C needs to work an electromagnet mounted on the compressor energizes and pulls the rings on the clutch into contact with the pulley which then turns the compressor shaft. 

Tekamul > nFamousCJ - Keeper of Stringbean, Gengars and a Deezul 01/02/2020 at 18:19

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Mmy people leave their decorations up through the 12 days of Christmas, which end Jan. 6th.

And all clutches have moving parts, unless they've figured out how to make a reliable "electromagnetic" variety that could hold or slip phase at will.

lone_liberal > nFamousCJ - Keeper of Stringbean, Gengars and a Deezul 01/02/2020 at 18:23

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I don’t put them up so it’s a question that doesn’t really apply to me, but that’s never stopped me from giving my opinion before! I don’t have a problem with people leaving them up for a while since this time of year is so incredibly dreary. It’s kind of nice to see a bit of light and color. 

nFamousCJ - Keeper of Stringbean, Gengars and a Deezul > Tekamul 01/02/2020 at 18:23

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Wait the 12 days ends the 6th? I always thought it was the 12 days leading up to. Woops. 

Tekamul > nFamousCJ - Keeper of Stringbean, Gengars and a Deezul 01/02/2020 at 18:25

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Y eah. It's not typically an American thing, but it's common in Europe. The 12th day is 3 Kings Day, when the 3 wise men showed up.

Deltyn drives a meh car > Tekamul 01/02/2020 at 18:28

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Ac compressor clutches are engaged with electromagnetism. The 3 silver pieces on  the clutch are the spring. The smaller disc is the hub. The larger disc with concentric circles is the clutch face. Some newer style ac compressors still have a clutch, but also have variable output by means of an internal valve; all in the name of squeezing out mpg

MiniGTI - now with XJ6 > nFamousCJ - Keeper of Stringbean, Gengars and a Deezul 01/02/2020 at 18:41

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I leave mine up until Candlemas ( https://en.wikipedia.org/wiki/Candlemas ). Neighborhood be damned, I’ll be the last one ha.

Tree’s probably going out around Monday though it’s getting pretty shabby. 

just-a-scratch > Tekamul 01/02/2020 at 19:31

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We use electromagnetic clutches on 600hp motors at work. They’re quite reliable, but low efficiency at low (much less than s ynchronous) speed.

Dr. Zoidberg - RIP Oppo > nFamousCJ - Keeper of Stringbean, Gengars and a Deezul 01/02/2020 at 19:37

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I took all my decorations down on the 26th. I think it’s perfectly acceptable to leave them up through New Years. I notice many people that actually celebrate Christmas for the actual Jesus aspect instead of the whole consumerism thing will leave lights up longer, and proudly. That’s all good to me, but other people leaving the inflatable reindeer and snowmen in the lawns in February is a little ridiculous.

Brickman > nFamousCJ - Keeper of Stringbean, Gengars and a Deezul 01/02/2020 at 20:27

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The silver part is the “spring” When the electromagnetic coil on the compressor turns on, it pulls the black metal attached to the spring to the coil and makes contact with the pulley turning the compressor.

I usually leave my lights up a week after Christmas

nFamousCJ - Keeper of Stringbean, Gengars and a Deezul > Brickman 01/02/2020 at 20:39

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Ohhh ok. I kept thinking it spun. But I was able to push it and it flexed. Those magnets better be strong because that took some force. 

Tekamul > just-a-scratch 01/02/2020 at 21:59

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Like a hysteresis clutch? I’ve always found the concept intriguing, but haven’t dug into them.

Tekamul > Deltyn drives a meh car 01/02/2020 at 22:01

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Sure, but they’re still electromechanical, so they’re still rubbing parts together that have to move to touch each other.

gmporschenut also a fan of hondas > nFamousCJ - Keeper of Stringbean, Gengars and a Deezul 01/02/2020 at 22:06

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My family will put candles in the windows and run them through jan. example below. decorations in jan bug me less than when folks run them in Nov,