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I want to simulate induced force by helmholtz coil

Posted Feb 1, 2012, 11:49 p.m. EST Low-Frequency Electromagnetics Version 4.2 2 Replies

Jaemyung Lim
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I want to simulate how much force is induced to the permanent magnet when I use helmholtz coil and put a permanent magnet in the middle of coil.
However, it cannot be simulated.

I guess the setting about permanent magnet is incorrect.
What I want simulate is just a commercial disk shape magnet.
Like this,

www.kjmagnetics.com/proddetail.asp?prod=D101-N52


I attached my simulation file.
Coul any body help me?

Thank you

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2 Replies Last Post Feb 2, 2012, 6:09 p.m. EST
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Feb 2, 2012, 2:56 a.m. EST
Hi

Why use 2 physics, oyu can keep MF and remove the MFNC, then add a new "ampere law" node in MF for the magnet, define Constitutive Relation to MAgentisation and set 1E6 A/m (or whatever fits your magnet) for the My value. Then add a domain Force calculation on the magnet

This should help ;)

--
Good luck
Ivar
Hi Why use 2 physics, oyu can keep MF and remove the MFNC, then add a new "ampere law" node in MF for the magnet, define Constitutive Relation to MAgentisation and set 1E6 A/m (or whatever fits your magnet) for the My value. Then add a domain Force calculation on the magnet This should help ;) -- Good luck Ivar
Jaemyung Lim
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Posted: 1 decade ago Feb 2, 2012, 6:09 p.m. EST
At first, I appreciate your help.
There was a progress in simulation.
However, I have another question.
In the simulation, even though I changed current density, the force is not changed.
Could you check my model and tell me which one is incorrect?

Thank you so much.
At first, I appreciate your help. There was a progress in simulation. However, I have another question. In the simulation, even though I changed current density, the force is not changed. Could you check my model and tell me which one is incorrect? Thank you so much.

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