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Lumberjack help
All applications
Measuring a magnetic…

Swirling sphere

For this rotor and stator no special equipment is necessary
Author: Jaime Iglesias Garre, Barcelona, Spain, [email protected]
Online since: 02/06/2009, Number of visits: 376451
For my experiment I needed a roll of adhesive tape with a diameter of 75 mm. On the inside of the roll I attached 20 disc magnets S-08-05-N in regular intervals with an isolating tape. As you can see, I needed tons of tape, so the magnets would not attach to each other. All magnets are arranged in the same way, with the north pole towards the inside.
Here you can see in detail how I proceeded with the tape. In this version you cannot see the magnets. Maybe you like this version better - spectators might be even more impressed if they don't get the principle right away.
The rotor consists of a non-magnetic steel sphere and 4 disc magnets S-03-03-N. The individual disc magnets are staggered on the sphere by 90 degrees.

On the picture you see 8 magnets, but you only need 4.
As soon as the roll is placed over the rotor, it starts rotating (see video below).
...
Note from the supermagnete team: Another customer implemented this experiment in 2015 with different magnets and achieved nice results:
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Articles used

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ST-K-13-N
Steel balls 13 mm
Steel balls 13 mm, not magnets!, ferromagnetic, nickel-plated, Ø 12,7 mm
To combine with neodymium magnets
ST-K-13-N
10 pcs. 0,43 EUR ea.*
from 40 pcs. 0,38 EUR ea.*
from 80 pcs. 0,36 EUR ea.*
from 160 pcs. 0,34 EUR ea.*
Ask for a rebate from 5 000 pcs.
Available: 980 pcs.
S-03-03-N
S-03-03-N
Disc magnet Ø 3 mm, height 3 mm, holds approx. 330 g, Neodymium, N45, nickel-plated
S-03-03-N
20 pcs. 0,26 EUR ea.*
from 60 pcs. 0,22 EUR ea.*
from 140 pcs. 0,19 EUR ea.*
from 360 pcs. 0,16 EUR ea.*
Ask for a rebate from 1 200 pcs.
Available: 53 920 pcs.
S-08-05-N
S-08-05-N
Disc magnet Ø 8 mm, height 5 mm, holds approx. 2 kg, Neodymium, N45, nickel-plated
S-08-05-N
10 pcs. 0,50 EUR ea.*
from 40 pcs. 0,42 EUR ea.*
from 80 pcs. 0,38 EUR ea.*
from 160 pcs. 0,35 EUR ea.*
Ask for a rebate from 900 pcs.
Available: 55 970 pcs.
ST-K-08-N
Steel balls 8 mm
Steel balls 8 mm, not magnets!, ferromagnetic, nickel-plated, Ø 8 mm
To combine with neodymium magnets
ST-K-08-N
10 pcs. 0,35 EUR ea.*
from 40 pcs. 0,29 EUR ea.*
from 80 pcs. 0,27 EUR ea.*
from 160 pcs. 0,25 EUR ea.*
Ask for a rebate from 1 500 pcs.
 
Receive e-mail when item available again
ST-K-10-N
Steel balls 10 mm
Steel balls 10 mm, not magnets!, ferromagnetic, nickel-plated, Ø 10 mm
To combine with neodymium magnets
ST-K-10-N
10 pcs. 0,34 EUR ea.*
from 40 pcs. 0,29 EUR ea.*
from 80 pcs. 0,27 EUR ea.*
from 160 pcs. 0,25 EUR ea.*
Ask for a rebate from 2 500 pcs.
Available: 2 300 pcs.
ST-K-20-N
Steel balls 20 mm
Steel balls 20 mm, not magnets!, ferromagnetic, nickel-plated, Ø 20 mm
To combine with neodymium magnets
ST-K-20-N
10 pcs. 1,14 EUR ea.*
from 40 pcs. 0,96 EUR ea.*
from 80 pcs. 0,88 EUR ea.*
from 160 pcs. 0,82 EUR ea.*
Ask for a rebate from 550 pcs.
Available: 120 pcs.
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