Years trying to find something like you did on this very easy explained video. I repeated just what you did and I got the same results. THANK YOU VERY MUCH!!! You have brought the light to my life...
Thanks dude! For me this is very useful, trying to use FEMM for the first time, and with this simple explanation i understood almost everything needed to know about it. Be Blessed mate! Happy new year!
GAJ Thanks very much for the detail and step by step explanation which epitomizes your good quality as a teacher.At least I can now use FEMM for other models. God bless you
Thanks a lot for the video. Some more info. for beginners like me: + and - for coil turns indicate sense of the winding (out of the screen/into the screen). Boundary condition 'Prescribed A' with A=0 indicates homogeneous Dirichlet condition. It mean the flux lines are tangential to the boundary and no flux lines cross that boundary.Such a condition is equivalent to considering an external material with null mag.permeability,which is magnetic insulating material just outside the domain(circle).
I am glad I could reproduce your demo on my second attempt. 1: When I put 2 identical coils end to end with very little gap, with no metal (iron ) components, the force integration after cranking succesfully , does not show any significant force in the coil block. 2 : If I put M50 just outside the coil, after cranking succesfully, there is no significant force anywhere in the integrator. (Coil diameter 30 cm , depth 1 cm, 50 A, 100 turns awg10.ps. Relax if U dont want to spend time on this tx.
Hi,I am glad you could reproduce it.If I understand you correctly 1. I think you need a core, M-50 etc. to direct the Magneto motive force through the core and create the force, so it might be a reason why the force is not significant.. 2. By putting the M-50 outside the coil you are possibly not creating the relevant flux path, and thereby not generating any force. You need the coil loop to go around your Core, to create the relevant flux paths. Leaving out the Boundary can also cause no force
Hi, I think in the resulting colour plot (17:22 in the video on the right) there is a legend/key, this shows which colour represents the amount of flux density. If the flux density is too high eg 2.5T for a material that saturates at 1.5T then you know that it will saturate. Quick reference: wiki/Saturation_(magnetic).
Thank you for the tutorial! When you set the depth as 1 cm in the initial problem tab, what is the significance of it? Is it to give the dimension for the 3rd co-ordinate, since it is a 2D representation?
Hi, yes, the depth is defining the 3D representation - i.e. the third dimension. This is linked to whether you choose the planar or axial simulation option.
The other video is a bit faster which shows the overview, the purpose of this video was to provide a slower one in detail so that each step can be followed.
Very helpful, thank you! Do you know where can I download new materials for the material library? I just installed FEMM and only a few materials are inside.
Hi Mikail. Thank you for the explanation. Suppose the coil is wound on a paper bound bobbin, can you please tell me how is it that we can model the bobbin on FEMM? Because I just see air as the material. Nothing related to the material of the bobbin used for wounding the coil.
Hi Goutham, My understanding is it depends on the permeability of the material, often so close to air, you can possibly approximate it to that. Validate it with checking permeability of air vs paper. Alternatives: create a new material with permeability factor that you have
+JintanLoves Menma . Hi Glad it was useful. I think FEMM only handles Magnetostatics, which is at discrete time steps. Maybe try doing steps at various points of the motion.
Hi, I am not sure about this. FEMM does have a separate thermal problem feature, although I am not sure the coupling between the physics is there. There is transient heat analysis example on the FEMM site, that may help.
I have problem in assigning the properties for 10AWG, I cannot assign it to be COIL CIRCUIT. There is only NONE at the bar. anybody can help me with it? TQ
Maybe this helps: Watch from 7:50, Properties>Material Library>Add Material AWG wire. Remember you have to drag it from one side, to the other side, not just click.
Kritika Deepak Hi, I am not exactly sure how this would be achieved, however the following examples may help: www.femm.info/wiki/InductionMotorExample www.femm.info/wiki/PermanentMagnetExample also google for: femm back emf led to www.femm.info/list/msg02353.html Hope this helps.
Hi, haven't done it myself. But I googled "back emf femm", and quite a few links came up: www.femm.info/list/pdf00005 www.femm.info/list/msg02353 Perhaps they may be useful
Hi! Really impressive! I am only wondering how did you derive the pulling force since this is a 2d flux simulation? Correct me if I am wrong but for the pulling force we need both the magnet's and armature's areas - the third dimension. Is there some preset - not shown in the video? Thanks!
Hi If I understand your question correctly: The 3d dimension is stated in the depth. For example, in the problem definition you state the depth which is basically defining the 3d dimension. You are correct, this depth is then applied to both the coil and the material. At about 1:06 in the video above, this depth is defined.
Hey, I am not sure if there is a specific setting for that. Though, perhaps it can be approximated with specific material BH curves or a magnetostatic snapshot of specific elements and seeing the force produced.
Hi, 2) I think if you go into the problem definition, at the top. You may find a parameter that allows you to choose between Axi-symmetric vs. Planer. You might have to redraw the problem based on this change. For 1) I came across some interesting links/articles/papers when googling: FEMM Impedance, also maybe try bing search.
Hey, yes this is indeed possible. An example similar can be found here when you search for Lua Scripting example FEMM, I think it is under the examples link on the femm site.
This makes no sense on how you applied the voltage . What is the excitation value for the coil. What is it connected to. What voltage , what frequency AC/DC
Very nice demo. Slow enough to follow. Quick enough not to make me skip forward. Thank you.
Years trying to find something like you did on this very easy explained video. I repeated just what you did and I got the same results. THANK YOU VERY MUCH!!! You have brought the light to my life...
Glad you found it useful. All the best with your simulations.
Thanks dude!
For me this is very useful, trying to use FEMM for the first time, and with this simple explanation i understood almost everything needed to know about it.
Be Blessed mate!
Happy new year!
Cheers to all the nerds out there modeling magnetic fields!
not sure why I'm laughing on that, but cheers mate, cheers :D
Now you can design magnetic circuits that you had trouble with.
I am grateful.
thank you.
This was a great refresher as I had not used FEMM in many years. Thanks
Some of my friends are learning how to model using blender.
And here I am, learning how to model magnetic circuit on femm for my college Assignment.
Blender is also good. May be an opportunity to integrate it with Simulations some day ;-)
Many thanks. I repeated step by step your job and have similar result. It is wonderful training for first step in FEMM
GAJ
Thanks very much for the detail and step by step explanation which epitomizes your good quality as a teacher.At least I can now use FEMM for other models.
God bless you
Thanks a lot for the video.
Some more info. for beginners like me:
+ and - for coil turns indicate sense of the winding (out of the screen/into the screen).
Boundary condition 'Prescribed A' with A=0 indicates homogeneous Dirichlet condition. It mean the flux lines are tangential to the boundary and no flux lines cross that boundary.Such a condition is equivalent to considering an external material with null mag.permeability,which is magnetic insulating material just outside the domain(circle).
I am glad I could reproduce your demo on my second attempt. 1: When I put 2 identical coils end to end with very little gap, with no metal (iron ) components, the force integration after cranking succesfully , does not show any significant force in the coil block. 2 : If I put M50 just outside the coil, after cranking succesfully, there is no significant force anywhere in the integrator. (Coil diameter 30 cm , depth 1 cm, 50 A, 100 turns awg10.ps. Relax if U dont want to spend time on this tx.
Thanks for the tutorial! I followed along with the video, and I think it was a good introduction on how to use FEMM.
+Jim Monte I am glad that you found it useful. All the best for future simulations.
You helped me alot to get into this program. Thank u very much for the video and your work.
great instructions. Thank you.
Thank you for this thorough explanation.
Thank you very much! Very helpful for my students. I have only difficulties with the axissymetric problems
Hi,I am glad you could reproduce it.If I understand you correctly
1. I think you need a core, M-50 etc. to direct the Magneto motive force through the core and create the force, so it might be a reason why the force is not significant..
2. By putting the M-50 outside the coil you are possibly not creating the relevant flux path, and thereby not generating any force. You need the coil loop to go around your Core, to create the relevant flux paths.
Leaving out the Boundary can also cause no force
Extremely helpful THANK YOU!
Hi, I think in the resulting colour plot (17:22 in the video on the right) there is a legend/key, this shows which colour represents the amount of flux density. If the flux density is too high eg 2.5T for a material that saturates at 1.5T then you know that it will saturate. Quick reference:
wiki/Saturation_(magnetic).
Thank you for the tutorial!
When you set the depth as 1 cm in the initial problem tab, what is the significance of it? Is it to give the dimension for the 3rd co-ordinate, since it is a 2D representation?
Hi, yes, the depth is defining the 3D representation - i.e. the third dimension. This is linked to whether you choose the planar or axial simulation option.
Thanks for the help. This is an awesome tutorial!
Thanks for the video! Great way to start
Thank alot, quick and shows all the basics. Could speak a little faster but thats what speed 1.5 is for, lol.
The other video is a bit faster which shows the overview, the purpose of this video was to provide a slower one in detail so that each step can be followed.
highly helpful
Amazing you are very good, thanks a lot
Allah bless you... I can easily say that you saved my life with this video!
Thank you so much for the kind words. Glad it could be of use. Jzk
Thank you so much, be blessed.
Thank you sir. I sincerely appreciate for this video!
If you don't mind, could you let me know some useful hot keys of femm, please?
I think the manual has a good list of hot keys if you google for it, also if you hover over each button it may show you the hot key.
great work. thank you so much.
Thank you so much! it's so clear. But could you please say something about the usage of the Lua in FEMM next time?
Very helpful, thank you! Do you know where can I download new materials for the material library? I just installed FEMM and only a few materials are inside.
Thank you. It was very useful.
Helping me in 2021
Hi sir...I need ur help...i am new and i dont know how to use femm to find dielectric strength of different materials
Hi,
Thank You for teaching the basics! Well done!
Big Like!
Gábor Szűcs I am glad that you found it useful.
Thanks for the great tutorial. I was just wondering how do you remove / delete dots if you make a mistake?
+Arasch Lagies Hi, you can right click to select and then click the delete key, or the red x button on the top toolbar. Hope this helps.
Thanks a million!
Hi Mikail. Thank you for the explanation. Suppose the coil is wound on a paper bound bobbin, can you please tell me how is it that we can model the bobbin on FEMM? Because I just see air as the material. Nothing related to the material of the bobbin used for wounding the coil.
Hi Goutham, My understanding is it depends on the permeability of the material, often so close to air, you can possibly approximate it to that. Validate it with checking permeability of air vs paper. Alternatives: create a new material with permeability factor that you have
Thank You
thank you very much.
Thanks a lot for the video.
good job liked
Very helpfull. Thank you!
hi, thanks a lot for the video. I have a question. How can we say from the flux density color plot that the material is saturated? Thank you.
Hİ mikail. I wonder the total turn count of the magnetic circuit. Is it 5000 or 10000 ?
thank you so much for this tutorial !!! is it possible with FEMM to find out the magnetic force on an object which is moving ?
+JintanLoves Menma . Hi Glad it was useful. I think FEMM only handles Magnetostatics, which is at discrete time steps. Maybe try doing steps at various points of the motion.
When I click the glass button, an error apear. .res file was not found. How to solve this problem ? Thanks
It could be that the files are saved in a different location, which cannot be read/written to, or you have to hit crank button first.
i see you can select the amps , can you also select the volts on the coil ?
No, as far as I am aware. The idea is that you should be able to extract the current based on your problem and apply it to the simulation.
where do i click to enter cordinates?
Can FEMM be used to simulate induction heating of a particular coil to a particular shape of ferromagnetic piece?
Hi, I am not sure about this. FEMM does have a separate thermal problem feature, although I am not sure the coupling between the physics is there. There is transient heat analysis example on the FEMM site, that may help.
Hii can you post a tutorial showing femm - Octavefemm interface
I have problem in assigning the properties for 10AWG, I cannot assign it to be COIL CIRCUIT. There is only NONE at the bar. anybody can help me with it? TQ
Maybe this helps: Watch from 7:50, Properties>Material Library>Add Material AWG wire.
Remember you have to drag it from one side, to the other side, not just click.
Thanks man!
Thanks....
Hey...any ideas how to calculate back emf of SPM machine ( or any electrical machine )?????
Kritika Deepak Hi, I am not exactly sure how this would be achieved, however the following examples may help: www.femm.info/wiki/InductionMotorExample
www.femm.info/wiki/PermanentMagnetExample
also google for: femm back emf led to www.femm.info/list/msg02353.html
Hope this helps.
Thanks...
Hi, haven't done it myself. But I googled "back emf femm", and quite a few links came up: www.femm.info/list/pdf00005
www.femm.info/list/msg02353
Perhaps they may be useful
Hi! Really impressive!
I am only wondering how did you derive the pulling force since this is a 2d flux simulation? Correct me if I am wrong but for the pulling force we need both the magnet's and armature's areas - the third dimension. Is there some preset - not shown in the video?
Thanks!
Hi
If I understand your question correctly: The 3d dimension is stated in the depth. For example, in the problem definition you state the depth which is basically defining the 3d dimension.
You are correct, this depth is then applied to both the coil and the material.
At about 1:06 in the video above, this depth is defined.
Thanks!
can I see results again when I closed results window?
I think if you press the glasses button, the results should be visible as it may save the solved file
how to modify a point's coordinates?
Hi bro! can we do magnetorheological fluid analysis using FEMM software?
Hey, I am not sure if there is a specific setting for that. Though, perhaps it can be approximated with specific material BH curves or a magnetostatic snapshot of specific elements and seeing the force produced.
1) how to find impedance of transformer any idea,.??/
2) how to convert planer problems in asymmetric problems?/
Hi, 2) I think if you go into the problem definition, at the top. You may find a parameter that allows you to choose between Axi-symmetric vs. Planer. You might have to redraw the problem based on this change. For 1) I came across some interesting links/articles/papers when googling: FEMM Impedance, also maybe try bing search.
thanks!
Danke!
How do you measure the length of a coil on FEMM?
I am not sure how to do this in FEMM. I assume you can measure 1 path, circumference/perimeter and then multiply by the number of turns.
Lekker Mikail! Great help, thanks!
PS. Are you a South African ?
Thank you, In RSA at the moment
Hell yeah
تشکر !!!
Still relevant :)
Hi. I have a question. How can I create the Lua script for this example?
Hey, yes this is indeed possible. An example similar can be found here when you search for Lua Scripting example FEMM, I think it is under the examples link on the femm site.
This makes no sense on how you applied the voltage . What is the excitation value for the coil. What is it connected to. What voltage , what frequency AC/DC
Hi, please see if the other video FEMM/Finite Element Analysis tutorial helps to contextualise some aspects a bit better.
How to download this software?
FEMM download page, FEMM info page - search on google.
Fucking magnets, how do they work?
Soon, we will know.
thanks a lot brother!