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Author Topic: what is the highest grade/field strength magnet in the market?  (Read 17050 times)

Offline Cairun

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i've got some n43 neo magnets, but i think i need stronger magnets.  i searched the internet for several sites that sell neo magnet, and the highest grade i've seen was about n48, with very limited shapes and sizes...  anyone knows where i can find magnets with higher grades with different shapes and sizes? preferably tube magnets.  thanks in advance for any help.

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Offline Honk

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Re: what is the highest grade/field strength magnet in the market?
« Reply #2 on: March 06, 2009, 08:05:02 AM »
The strongest available for sale is N54 but labs are working on grade N56.
Some distributors might even sell N55 but they are rare to find.
But instead uf using stronger grades just can just as well use a weaker but
thicker magnet to reach the same strength. That will be cheaper as well.

I've read that the strongest NdFeb magnet possible in theory is grade N64.
http://en.wikipedia.org/wiki/Neodymium_magnet
But I guess that we will have to wait for many years before we get there.

Free Energy | searching for free energy and discussing free energy

Re: what is the highest grade/field strength magnet in the market?
« Reply #2 on: March 06, 2009, 08:05:02 AM »
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Offline Cairun

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Re: what is the highest grade/field strength magnet in the market?
« Reply #3 on: March 06, 2009, 02:21:58 PM »
thanks for the suggestions. 

to oc,
it's a good site.  there could be a bit of problem with the SI units though because i usually work with English units.  i appreciate your help though.

to Honk
it's true a higher field strength can be reached with a longer magnet, but i need the mass of magnet to be as small as possible.  thanks for the suggestion. 

Offline hazens1

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Re: what is the highest grade/field strength magnet in the market?
« Reply #4 on: March 06, 2009, 03:15:43 PM »
I've got a bunch of 1/4"x1/4" cube N52 magnets. They are pretty tiny, 64 in a cube that totals 1"x1" cube. Each one has 5lb pull. All together they exert alot of force. You can get pretty strong and tiny in the N52 range. I think I paid about $6 for the 64 1/4" cubes. Good site to find N50 and N52 is http://www.kjmagnetics.com/products.asp?cat=168

These tiny 1/4"x1/16" disc magnets have 4lbs pull force http://www.kjmagnetics.com/proddetail.asp?prod=D41G%2DN52 you can get 50 of them for $13.

Free Energy | searching for free energy and discussing free energy

Re: what is the highest grade/field strength magnet in the market?
« Reply #4 on: March 06, 2009, 03:15:43 PM »
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Offline Cairun

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Re: what is the highest grade/field strength magnet in the market?
« Reply #5 on: March 06, 2009, 06:55:13 PM »
thanks, hazens.  i got my magnets from kjmagnetics as well.  i am looking for ring/tube magnets, and kjmagnetics only have grade n42 for ring/tube magnets.  thanks for suggestions though.

Offline AbbaRue

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Re: what is the highest grade/field strength magnet in the market?
« Reply #6 on: March 09, 2009, 02:02:03 AM »
I thought I should mention that it doesn't matter how thick a magnet is that doesn't increase the strength.

Free Energy | searching for free energy and discussing free energy

Re: what is the highest grade/field strength magnet in the market?
« Reply #6 on: March 09, 2009, 02:02:03 AM »
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Offline jadaro2600

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Re: what is the highest grade/field strength magnet in the market?
« Reply #7 on: March 09, 2009, 02:17:34 AM »
K&J is where I get my magnets ...if you can't get whatever it is working with an N42, what makes you think it will work with an N50 or an N52 or NXX?

btw, N38's are horrible - they're like rare earth mags without any heat resilience.

Offline Honk

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Re: what is the highest grade/field strength magnet in the market?
« Reply #8 on: March 09, 2009, 03:26:04 PM »
All neos without the marking M, H, SH, UH, EH or AH after the grade are limited to 80 degrees centigrade.
This has nothing to do with N38:s

M  -  handles 100 degrees C
H  -  handles 120 degrees C
SH - handles 150 degrees C
UH - handles 180 degrees C
EH - handles 200 degrees C
AH - handles 220 degrees C

Please see attachment.

Free Energy | searching for free energy and discussing free energy

Re: what is the highest grade/field strength magnet in the market?
« Reply #8 on: March 09, 2009, 03:26:04 PM »
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Offline eddywind

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Re: what is the highest grade/field strength magnet in the market?
« Reply #9 on: March 11, 2009, 04:16:14 AM »
some of my experience.
we make job shop customized motor for customers.many engineers asked us same qestion during their design process.

in fact, highest Br(Remanence) is not the only character should be considered.

Br, Hc and thickness of magnets should be considered together. sometimes, the reason of  magnetic field strength not enough is not becasue of low Br, but low Hc. Or thinkness is not enough, the working point is not good.   

Offline eddywind

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Re: what is the highest grade/field strength magnet in the market?
« Reply #10 on: March 11, 2009, 04:33:48 AM »
more information:

there are different grade NdFeB magnets, now, only M magnets could be  "50" or higher.
but one problem is the temperature coeffient. usually we do not use N or M magnets, H magnets are needed at least.

for example, if you make a motor with N55magnet, when the temperature is changing, the magnetic field strength change a lot also.

 
 

Free Energy | searching for free energy and discussing free energy

Re: what is the highest grade/field strength magnet in the market?
« Reply #10 on: March 11, 2009, 04:33:48 AM »
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Offline jadaro2600

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Re: what is the highest grade/field strength magnet in the market?
« Reply #11 on: March 11, 2009, 05:16:17 AM »
Rare earth magnets seem to recover from heat better than neomags - according to some sources ( Samarium Cobalt for example ).

Not always cost friendly - but neither are neomags.


Offline SomedayIsle

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Re: what is the highest grade/field strength magnet in the market?
« Reply #12 on: March 11, 2009, 05:46:17 AM »

I found some YT's a few years ago through alibaba...they were being sold in a product called the 'battery doubler'.  Definitely more powerful than NdFeB's for commensurate size.  Too bad they aren't allowed a bigger audience.  I'm stumped as to why they are not now widely available.....



hmmm

Offline khabe

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Re: what is the highest grade/field strength magnet in the market?
« Reply #13 on: March 11, 2009, 08:56:00 AM »
Rare earth magnets seem to recover from heat better than neomags - according to some sources ( Samarium Cobalt for example ).
Not always cost friendly - but neither are neomags.
Rare-earth magnets are made from alloys of rare earth elements.
Neodymium magnets are the strongest and most affordable type of rare-earth magnet. Neodymium alloy (Nd2Fe14B) is made of neodymium, iron and boron.
Samarium-cobalt magnets (chemical formula: SmCo5) are less common than Neodymium magnets because they are more expensive to produce and create a weaker magnetic field than Neodymium magnets. However, Samarium-cobalt magnets have a relatively high Curie point, which makes them suitable for high-temperature environments.
( http://en.wikipedia.org/wiki/Rare-earth_magnet )

True Gaussmeter costs a lot of,
Methodology how to meter  ... how its calibrated ...
Not every time you receive your magnets as strong as described, as well as described grade - you can easily examine (and often sacrify ::) using hot water up till boiling  >:(
Sometimes List of magnets for sale changes by stream of fashion ::)
Myself I do not worry about is it 50 ... 48 ... 45 or 44 ... it does not matter mach - true Grade and precision geometry are principals when building some machine,
Of course I buy and try every newby "high_end_grade" as well.
Good luck,
be strong,
khabe


Offline khabe

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Re: what is the highest grade/field strength magnet in the market?
« Reply #14 on: March 17, 2009, 09:59:51 AM »
What's the strongest magnet known in the Universe?
The answer is the magnetar, a rare type of neutron star.
...
Get much closer, and the magnetic force will rearrange the atoms in your body.
http://www.gsfc.nasa.gov/scienceques2003/20040206.htm

cheers,
khabe

The theoretical limit for neodymium magnets is grade N64
« Last Edit: March 17, 2009, 11:00:37 AM by khabe »

 

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