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demagnifing warning
By Gary D, Section Homebrewed Electricity Posted on Mon Jun 09, 2003 at 10:25:09 AM MST
Neo Questions

Since reading Radio Shack's Engineer's mini notebook, the warning that sticks with me is this "forcing the same poles of two magnets together can partially demagnetize both magnets". Has anyone noticed a drop of power over time when you force two or more magnets together to make a longer pole? I've seen several examples of this, and wondered if anyone has had a drop in output. Neat little book for a buck 99. Also was wondering if the operating range of neo's is 0 degrees celsius to 80 degrees, how is the gauss effected below freezing? Obviously the Dan's are getting juice well below that! Wasn't sure where to post this, sorry guys. Thanks for any responses Gary D.

demagnifing warning | 3 comments (3 topical)

Re: demagnifing warning (none / 0) (#1)
by drobert on Mon Jun 09, 2003 at 03:36:06 PM MST

www.grouparnold.com/mtc/questions.htm is a good place to go for the answer.

Re: coercivity + cool experiment (none / 0) (#2)
by ADMIN on Tue Jun 10, 2003 at 08:51:47 AM MST

I have the same little Forest M Mims book from Radioshack ;~)

It was written before NdFeB magnets were available, and that comment about using a keeper and other handling precautions (like not sliding them apart -- good luck not sliding them with NdFeB magnets!) applies to AlNiCo magnets, but not Neos. Ferrite magnets also have high coercivity, and don't have storage problems either.

However (COOL EXPERIMENT) -- take a big NdFeB magnet, and carefully bring a smaller ferrite or AlNiCo magnet slowly up to it. You'll feel the field from the small magnet resist, then fade and die, and then reverse in polarity. It feels very strange....

Cheers

DANF

Re: coercivity + cool experiment (none / 0) (#3)
by Gary D on Wed Jun 11, 2003 at 12:11:49 PM MST

Thanks Dan, wasn't sure if there was a problem or not. Refreshed my memories of my youth about magnets. Still wonder why the neo's low temp rating is 0 celsius.... 32 F. The magnets I got were definately strong below 0 degrees. And I'm sure Colorado gets there too ;-) . Maybe they get a little more brittle at the low temps... just spectulating. Know all metal gets easier to snap at lower temps. Most anyways. Thanks for the responses guys! Gary D.

[ Parent ]

demagnifing warning | 3 comments (3 topical)

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