User:Brian P. Josey/Notebook/2011/02/01

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==Entry title==
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==FEMM Model of My Lego Electromagnet==
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On [[User:Brian P. Josey/Notebook/2011/01/27|Thursday]] I finished the building portion of my electromagnet, and took some measurements of its dimensions. Today, I want to collect all of this information together into a model in FEMM, to calculate the magnetic field within the electromagnet. Because of the unique design of my electromagnet, I have to make some changes and assumptions to model it in FEMM.
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Most of the changes I have to do deal with converting a real three dimensional object into a simplified axisymmetric object. The first assumption that I made is that I could average out the distances between two parallel sides on the Lego piece to get an average diameter. This comes from the wires having a roughly rectangular shape in my magnet, and FEMM only working in cylindrical shapes. The next assumption is that the plastic, and its complex shape, will have no effect on the magnet. I feel that it is safe to assume this, so the plastic will be simplified greatly, leaving only a small strip.
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Putting these assumptions to work, I created the following model in FEMM:
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Revision as of 15:22, 1 February 2011

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FEMM Model of My Lego Electromagnet

On Thursday I finished the building portion of my electromagnet, and took some measurements of its dimensions. Today, I want to collect all of this information together into a model in FEMM, to calculate the magnetic field within the electromagnet. Because of the unique design of my electromagnet, I have to make some changes and assumptions to model it in FEMM.

Most of the changes I have to do deal with converting a real three dimensional object into a simplified axisymmetric object. The first assumption that I made is that I could average out the distances between two parallel sides on the Lego piece to get an average diameter. This comes from the wires having a roughly rectangular shape in my magnet, and FEMM only working in cylindrical shapes. The next assumption is that the plastic, and its complex shape, will have no effect on the magnet. I feel that it is safe to assume this, so the plastic will be simplified greatly, leaving only a small strip.

Putting these assumptions to work, I created the following model in FEMM:


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