Almost Smart  

Go Back   Almost Smart > The Lounge > Science

Reply
 
Thread Tools
Old 06-27-2011   #1
ablethevoice
Vintage Human
 
ablethevoice's Avatar
 
Join Date: Oct 2005
Location: Gulf Coast Florida Ivan and Dennis survivor!
Age: 59
Posts: 4,131
Rep Power: 84
ablethevoice has a reputation beyond reputeablethevoice has a reputation beyond reputeablethevoice has a reputation beyond reputeablethevoice has a reputation beyond reputeablethevoice has a reputation beyond reputeablethevoice has a reputation beyond reputeablethevoice has a reputation beyond reputeablethevoice has a reputation beyond reputeablethevoice has a reputation beyond reputeablethevoice has a reputation beyond reputeablethevoice has a reputation beyond repute
Send a message via MSN to ablethevoice Send a message via Yahoo to ablethevoice
Another "material science" discussion

I recently disassembled an ancient hard drive I had laying around and salvaged the magnets from them. If you've never played with these little brutes, try it out some time. The strength of these bastards will astound you the first time you handle them. Playing with them of course got me to musing about magnets in general and so here I go.

The first magnets were the naturally occurring lodestones which have been known since prehistory. Much later, iron and iron alloys were artificially magnetized to create magnets. For many years the "alnico" magnet was king of the industry. This was a mix of ALuminum, NIckle and CObalt and (mostly) iron. Tinkering with the ratios of those elements to try and get the alloy to take stronger magnetic fields ended up with the engineers and metallurgists banging against a wall. It wasn't until the mid 70s that compounds containing rare earth elements (which actually aren't particularly "rare" or expensive) were found to be able to take far, far higher currents and thus be magnetized to strengths unheard of by previous standards. These new super magnets found countless uses almost instantly. It was one of those things that scientists and engineers dreamed of..."If only we could make a magnet the size of a grain of sand! Imagine the tiny DC motors we could build with them!" It certainly isn't a surprise that the venerable Sony Walkman had to wait for the invention of these rare-earth supermagnets. Without them, even the smallest DC motors were fairly bulky because the alnico magnets had to be a certain size in order to develop enough torque to be able to pull the tape across the playback head. The supermagnets made it possible to produce DC motors 1/8th the size of the old alnico motors and still produce as much or more power. The tiny headphones, too, were only possible because of the tiny superstrong magnets inside.

Now, of course, they are everywhere. In hard drives, toys, shake-to-charge flashlights, wind-up radios, the motors in electric cars. The "silent" mode on your cellphone is a pencil-eraser-sized motor with a slightly off-balance flywheel. Modern wind turbines use supermagnets.

The industry certainly has exploded as have the selection of this new breed of magnet.
Check THIS out for a look at a tiny magnet weighing only .000416 oz yet has a pull strength of 1.17 ounces!

And now behold THIS behemoth weighing about 9 pounds with a pull of (get this!!) 1,226.5 pounds!
Think of the generator you could build with 4 of those!

Now that the rare-earths are being studied, I have no doubt there will be even stronger magnets developed for uses in applications I can't begin to imagine...
__________________
"There Is No Religion Higher Than Truth." - Motto of the Theosophical Society

"Reality is merely an illusion, albeit a very persistent one." Albert Einstein

"The difference between genius and stupidity is genius has its limits." —Albert Einstein

“It's fortunate for governments that people don't think." - Adolph Hitler

Sturkis akidit ("shit happens") - Latin


Bent Ears Audio Laboratories - Better Music Through Chemistry

MUSIC IS LIKE CANDY. IT'S ONLY GOOD WHEN YOU GET RID OF ALL THE RAPPERS.
))#####D~~~~ (_l_)
ablethevoice is offline   Reply With Quote
Old 06-29-2011   #2
EmperorChaos
Ruin you like this website.
 
EmperorChaos's Avatar
 
Join Date: May 2005
Location: Charleston, South Carolina, United States, North America, Western Hemisphere, Earth, Sol System, Milky Way, Local Group, Virgo Supercluster
Age: 37
Posts: 11,726
Rep Power: 145
EmperorChaos has a reputation beyond reputeEmperorChaos has a reputation beyond reputeEmperorChaos has a reputation beyond reputeEmperorChaos has a reputation beyond reputeEmperorChaos has a reputation beyond reputeEmperorChaos has a reputation beyond reputeEmperorChaos has a reputation beyond reputeEmperorChaos has a reputation beyond reputeEmperorChaos has a reputation beyond reputeEmperorChaos has a reputation beyond reputeEmperorChaos has a reputation beyond repute
Send a message via ICQ to EmperorChaos Send a message via AIM to EmperorChaos Send a message via MSN to EmperorChaos Send a message via Yahoo to EmperorChaos
Re: Another "material science" discussion

Electromagnetism. Ain't it grand?

I know another powerful magnet type are the ones that hold up some shower rods.

I came across one of those bad boys once and put the attracting ends together and I couldn't get them apart. I'm really glad my hand wasn't in there.
__________________
The first thing that came into being, void and without form, a lifeless lump, unfashioned and unframed, the Prima Materia from which all comes, influenced by forms and given structure by matter it becomes all that is, with increase in entropy it is into which all shall fall, endlessly and in all directions, a self-reflexive paradox.
-=-=-=-
"Self-education is, I firmly believe, the only kind of education there is." -Isaac Asimov
EmperorChaos is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
If I make this such an uncomfortable place for discussion, then please... Sytrohs87 Debate & Politics 64 04-09-2009 01:14 PM
Changes...A discussion Pittielynn General 24 02-24-2009 02:51 AM
Purpose of Dada/Various Other Areas of Art Discussion Sytrohs87 Art & Photography 15 06-11-2008 01:22 PM
Philosophical Discussion Thread Sytrohs87 Debate & Politics 44 07-14-2007 06:23 PM
Poetry Discussion: What you consider cliche Evra Writer's Corner 9 07-04-2005 04:43 PM


All times are GMT -5. The time now is 06:36 PM.


Powered by vBulletin® Version 3.8.3
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright ©2000 - 2006, Almost Smart