Using COMSOL Multiphysics FEA to test magnet

  1. Hi,

    I am new to the forum. I am an engineering designer and I work for myself at

    I am trying to set up a FEA test using COMSOL software.

    I have a trial version, and I wish to complete a simple test using the software, which will help me with my current customer enourmously!

    What I want to do, is to set up two 5mm diameter x 1mm thick rod magnets facing each other and 14mm apart; then take measurements of the "Magnetic Field Flux" in various distances between them.

    Once this is done, I would like to then plot a "Parametric Sweep", showing the effect of the same test but with (a) a pair of 3mm diameter magnets, and then (b) using a pair of 4mm magnets.

    The second test I would like to do, is to vary the strength of one magnet by say 0.5% and 1% and to see how much this effects the null point between the field boundaries.

    If possible, I would also like to do a similar test. But this time moving the probe that reads the field flux +/- 5mm longitudinally and at a fixed and equal distance from the faces of both magnets, to see what the result is.

    Does anyone here use Comsol, and can anyone advise me how to get started? I got confused after I turned it on! :redface: ... Ha ha. Although I think that I could pick it up in short time, with a little help?

    This work is for use on a new product that I am working on, and I will be waiting at least a week or more for a test jig, that would give me the same result, and would be quite expensive. I am hoping to see if this can be done more quickly and perhaps accurately.

    Can anyone advise me how to get started? I know that I need to use the AC/DC solver, and I have read through the small introductory manual that came with the demo disk (which is quite good), but it does not cover anything electromagnetic.

    I do have SolidWorks, so I also would like to import the magnets. But I must admit that I do not know really where to start.

    Would I be best to activate the SolidWorks "LiveLink" and how do I do this. Also I have found the paper which is for a "One Sided Magnet", which appears to be the closest thing that I can find to what I am doing? ... I am guessing that I can perhaps follow the instructions for this, and maybe change the values to suit what I am trying to achieve?

    Am I along the right lines? ... Attached is a file with the Jig that I have designed to undertake the same job (as PDF)

    Attached Files:

    Last edited: Mar 6, 2012
  2. jcsd
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