FEMM #2: Analysis of an EE-core Based Inductor with Linear Material

[@ashwinshetty1961]

Hi, thanks for making this amazing series on FEMM. It seems really useful for magnetostatic problems. I would like to know if this solver can be extended to time varying current problems for example in switch mode supplies and transformers. Looking forward to more such videos !!!

[@MarcosAlonsoElectronics]

Thanks for your message and encouraging words. Yes, it is possible to do time-harmonic magnetic analysis. I will deal with that in future videos. Thanks!

[@ashwinshetty1961]

@@MarcosAlonsoElectronics 👍 Will surely wait for your next video on this topic !!!

[@vandersonpc]

HI, many thanks for the great video! It's possible for you to please show an example of a toroidal core inductor analysis in FEMM?

[@MarcosAlonsoElectronics]

Thanks for your comment and suggestion. In principle, a toroidal inductor has no axial or planar symmetry due to the distribution of the winding but it could be approximated by a cylindrical shape. It's interesting. I will consider. Thanks!

[@robertthurman8412]

Great video. Did you ever get around to the time-varying magnetic analysis?

[@MarcosAlonsoElectronics]

There is an example of this to analyze skin effect on wires in video FEMM #5: kzbin.info/www/bejne/qmmzZWN6jLF2jrc Thanks for your comment

[@robertthurman8412]

@@MarcosAlonsoElectronics Thank you Sir. I found it.

[@shashankvarshney8487]

Hello Sir. I am trying to perform femm analysis of transformer at ETD-49 core operating in SMPS at 130kHz. But at non-linear B-H curve for ferrite core for N87 material, it is showing wrong value of inductance of primary & secondary winding as well as wrong value for magnetic flux density. Can you please help me in doing the femm analysis of transformer in right way. Thanks in advance.

[@MarcosAlonsoElectronics]

Hello, in my experience FEMM is not good to analyze magnetics under saturation. In fact, the manual says that only light saturation can be considered. You can try my magnetics library for LTspice to simulate inductors under saturation. See the following video for more info: kzbin.info/www/bejne/oWSudKikrdh7odk

[@Fooballium]

Nice but it seems there is a mistake on this calculation. Depth must be adjusted. 1:06 the depth shown as 7.5mm and 6:45 it is set as 1mm. This changes all the results I guess. Because it change the cross section area when we think 3D. I am not a pro but it must be so. I love your FEMM videos. Please teach us more. I also have a question. If I have a cylindrical solenoid and if I put two NdFdB N40 grade magnet for example. How can I simulate it with planar? I also don't exactly understand why the turns are -80 one side and 80 another side? Is it because the current direction?

[@MarcosAlonsoElectronics]

Thanks for your comment. The depth selection is shown at 10:07. There it is set to 7.5 mm. The sign of the number of turns indicates the direction of current flow associated with a positive-valued circuit current. So one side must be positive and the other negative. Regarding the solenoid with two magnets problem, I think it can be done one way or another but I have to think about it. Maybe for a future video. Thanks!

[@Fooballium]

Thanks Professor for yourtime and effort. I missed this moment :) I am waiting for your future videos.

[@MarcosAlonsoElectronics]

All files are available here: github.com/marcosalonsoelectronics/FEMM-2