All Magnetic Self Centering Bearings

[Bret Cahill]

Is it possible to make a bearing out of a ring magnet and a smaller
magnet held above above the center of the ring by NS SN or SN NS
repulsion?

The smaller magnet could be prevented from flipping with a non magnetic
"keel" or rod hanging from the bottom of the small magnet and dropping
through the hole.

Will the flux from the ring ever have self centering effect?


Bret Cahill

 

[jasen]

Is it possible to make a bearing out of a ring magnet and a smaller
magnet held above above the center of the ring by NS SN or SN NS
repulsion?

The smaller magnet could be prevented from flipping with a non magnetic
"keel" or rod hanging from the bottom of the small magnet and dropping
through the hole.

cross section:


SSSSSSSSSSSSSSSS
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NNNNNNNNNNNNNNNN
||
NNNNN || NNNNN
##### || #####
##### || #####
##### || #####
##### || #####
##### || #####
##### || #####
##### || #####
##### || #####
SSSSS || SSSSS
||
||
LOAD
\ /
\/


yeah, could work.


Bye.
Jasen

 

[Rich Grise]

I saw a little flying-saucer thing that did exactly this - there was
a plastic sheet sitting on top of the magnet, and the armature was a
little spinning top:

cross section:

||
||
SSSSSSSSSSSSSSSS
################
NNNNNNNNNNNNNNNN
\/

---------------------------- <- plastic

NNNNN NNNNN
##### #####
SSSSS SSSSS
---------------------------------------

You'd spin the top up - they sold this toy with a little flashlight-
sized spinner unit - then raise the plastic thing, and at one point,
the little top would subtly rise up off the plastic, and sit and
float there until air friction slowed it down, when it just flopped
over, fell down, and sat there.

I'd like to combine one of these with a rotating field of some kind,
and have it run like that as long as the batteries were good.

Cheers!
Rich

 

[John Larkin]

cross section:


SSSSSSSSSSSSSSSS
################
################
################
################
NNNNNNNNNNNNNNNN
||
NNNNN || NNNNN
##### || #####
##### || #####
##### || #####
##### || #####
##### || #####
##### || #####
##### || #####
##### || #####
SSSSS || SSSSS
||
||
LOAD
\ /
\/


yeah, could work.


Bye.
Jasen

Mechanical (rotating disc) electric meters usually have magnetic
suspension bearings. The magnets support most of the weight of the
disc, and the central shaft just touches gently and loosely into
sleeve guides to provide stability. Very low friction. Introduced in
1948, I think.

John

 

[[email protected]]

Is it possible to make a bearing out of a ring magnet and a smaller
magnet held above above the center of the ring by NS SN or SN NS
repulsion?

The smaller magnet could be prevented from flipping with a non magnetic
"keel" or rod hanging from the bottom of the small magnet and dropping
through the hole.

Will the flux from the ring ever have self centering effect?


Bret Cahill

There are refrigeration compressors on the market now using "magnetic
bearings".......

http://www.turbocor.com/products_technology/magnetic.html