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Modelling of a permanent magnet

Posted Mar 30, 2013, 2:21 p.m. EDT Low-Frequency Electromagnetics Version 4.3 1 Reply

Pankaj Sahu
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Hello everyone,

I want to see the magnetic field lines from a bar shaped permanent magnet. I have created a rectangle and surrounded it with the air domain i.e a bigger rectangle. I have the following doubts:-

a) Do I have to create a separate material for the permanent magnet?
b) If yes, What properties do I have to assign to the material?
c) I have selected the Magnetic field (w/o currents) tab in the menu for the simulation. However, I am not able to decide the settins that should be done in this option.

I am very new to COMSOL and hence, I would be grateful to anyone who can be of help.

Thanks,

Pankaj
1 Reply Last Post Mar 30, 2013, 3:42 p.m. EDT
Edgar J. Kaiser Certified Consultant
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Posted: 1 decade ago Mar 30, 2013, 3:42 p.m. EDT

Hi,

if you only want to see stream lines, you can just assign a new Ampere's law to the magnet domain and under the 'magnetic field' tab change the constitutive relation to 'Magnetization' and choose the magnetization vector.

For a nice streamline display you should choose appropriate start points.

Cheers
Edgar

--
Edgar J. Kaiser
www.emphys.com
Hi, if you only want to see stream lines, you can just assign a new Ampere's law to the magnet domain and under the 'magnetic field' tab change the constitutive relation to 'Magnetization' and choose the magnetization vector. For a nice streamline display you should choose appropriate start points. Cheers Edgar -- Edgar J. Kaiser http://www.emphys.com

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