PDE magnetostatic electromagnet how to measure the magnetic field.
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Hi dear support from Matlab.
I recently finished designing my step/stl file on an electromagnet.
I got the shape, how do I apply around the electromagnet a coil? Or is this not needed? I would like to know the magnet field between two poles in 3D. Second why do I need boundary conditions?. The whole nabla thing is new to me.
For what I understand is, I upload the stl file in to Matlab, somehow apply the Ampere windings, and permeability for the stl file component. and do a simulation to determine the magnetic field. Maybe also change the geometry of the magnetic poles to increase the amount of Tesla.
I build something from scratch, heat treated (permeability 15000-20000) it and applied 6A at 30V over 500 windings from 0.4mm insulated wire.
回答 (3 件)
Ravi Kumar
2020 年 5 月 14 日
Hi Bastiaan,
It might be easier if you do a 2-D approximate analysis. For 3-D, modeling the air around the coil to solve for magnetic field can get very complicated if you are unfamiliar with FEA workflow, particularly dealing with mesh. On the other hand, you can draw simple 2-D geometry using PDEModeler, where you can complete the whole setup for magnetostatics analysis or create geometry using decsg function and use PDEModel object workflow.
Regards,
Ravi
Bastiaan Pierik
2020 年 5 月 18 日
編集済み: Bastiaan Pierik
2020 年 5 月 18 日
1 件のコメント
Ravi Kumar
2020 年 5 月 18 日
Hi Bastiaan,
Glad to see you make progress in setting up your model. You did not past the full code to fully understand and respond to your question. It would be good if you just save the whole set up in PDEModeler ->File ->Save As..., then I will have better idea of your setup.
Regards,
Ravi
Bastiaan Pierik
2020 年 5 月 19 日
編集済み: Bastiaan Pierik
2020 年 5 月 19 日
2 件のコメント
Ravi Kumar
2020 年 5 月 20 日
Hi Bastiaan,
I took a look at your model. I think you assigned the material properties (in PDE specification) incorrectly. Air and copper should have permeability close to a vacuum, which is 4*pi*1E-7 (for faces 5,6,8,10,11, and 7), no current for air (for faces 8,10,11, and 7) and a current value of 3E13 for face 5 and -3E13 for face 6 (not the change in sign). The iron core should have a permeability of 20000 and no current. Also, it looks like you selected nonlinear solver based on the example, however, in your case call properties are constant, so you don't need that. With these changes, I obtain the following results (I have attached the code file also):
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/294794/image.jpeg)
This is still not correct, but I think you are progressing in the right direction. One thing I would like you to check is if you have all units in a consistent unit system. PDE Toolbox does not have units, but all your model data, geometry, material properties, etc. should be provided in a consistent unit system. As of this model all material properties are in SI units, this means geometry is also in m, I don't think this is true. Can you update the geometry to be m? And also make sure that the current density is also computed correctly.
Regards,
Ravi
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