smco5 disc D20x1mm having both N and S on the same face
smco5 disc D20x1mm having both N and S on the same face
(OP)
We have smoc5 magnets, D20x1mm, axil magnetised. Now we inspect the magnets with a gauss meter at both centre and peripheral saying 12, 3, 6, 9 clock, and found a few of them having both N and S on the same face. Here is a photo. Is there anyone who know why this happened?
Thanks.
Sam
Thanks.
Sam





RE: smco5 disc D20x1mm having both N and S on the same face
If you are measuring at the peripheral edge, you are likely picking up stray flux lines, and the polarity will switch North/South
It is very difficult to magnetize SmCo so it'll have multiple poles on the face. Most likely it is magnetized axially and the stray flux lines are fooling you into thinking it is otherwise.
RE: smco5 disc D20x1mm having both N and S on the same face
RE: smco5 disc D20x1mm having both N and S on the same face
TTFN

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RE: smco5 disc D20x1mm having both N and S on the same face
this phenomenon happened only on a spot over a surface, do you think it is possible that there is a small crack on the magnets?
Thanks
RE: smco5 disc D20x1mm having both N and S on the same face
http://files.engineering.com/getfile.aspx?folder=0...
RE: smco5 disc D20x1mm having both N and S on the same face
I once came across a situation where a magnet supplier made SmCo magnets with powder particles that were too large. The magnets didn't sinter properly and there were significant regions that were 'dead' magnetically. It's a longshot, but maybe you have a similar situation. If you have access to green magview paper, you could easily see the presence of any reverse domains on the surface.
RE: smco5 disc D20x1mm having both N and S on the same face
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RE: smco5 disc D20x1mm having both N and S on the same face
RE: smco5 disc D20x1mm having both N and S on the same face
1. only two poles at one plane
2. one pole must be located on the edge and reside only a small portion of the plane. however, if the the angle of miss alignment is 45 degree, half of plane is N, the other half is S.
3. the polarity and area are opposite to the other side of the disc
RE: smco5 disc D20x1mm having both N and S on the same face
It is nothing more than Fe, or Fe oxides soft magnetic powder whihc can be moved between the "paper" (plastic). one can easily make such a paper in minutes to view the magnetic pattern (neutral section, poles, and flux distribution etc)
RE: smco5 disc D20x1mm having both N and S on the same face
The paper contains nickel flakes dispersed in suspension in individual cells. The flakes can rotate such that the plate of the flake is parallel to the magnetic field. If the flakes are directly over the N/S dividing line the white color of the flakes produces a white line demarcating the pole boundary.
The paper is very useful for confirming multi-pole magnetizations.
RE: smco5 disc D20x1mm having both N and S on the same face
Arnold made gray and brown versions. gray is from Fe3O4 or Fe, brown from Fe2O3. I worked for Arnold and made myself in couple of occasions temporarialy for operators to check the effect of de-magnetization: if not fully demagnetized, one will be able to observe the movement of the powder in the paper.
RE: smco5 disc D20x1mm having both N and S on the same face
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RE: smco5 disc D20x1mm having both N and S on the same face
RE: smco5 disc D20x1mm having both N and S on the same face
TTFN

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Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
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RE: smco5 disc D20x1mm having both N and S on the same face