FEMM Simulation Help

Joined
Feb 21, 2020
Messages
21
Folks,

I just took a crash course video on YouTube about FEMM software to simulate an axial motor I'm working with. The flux distribution looks about right, I was expecting something like that, however the force generated is too little, around 50 N, I was expecting a lot more based on the dimensions for this motor. I was wondering if any of you guys can help to see whats wrong and why that little force is being generated. I tried to attach the FEMM file but it doesn't let me attached files other than images. So I can provide the FEMM file upon request via email.
Here is how the flux looks like
 

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If I'm reading the graphic right, you have essentially no magnetic flux encompassing current carrying conductors except for minor leakage. In other words, no interaction between flux and current.
Regards,
major
 
I don't know this software, but the flux lines should pass the coils vertically and return on the adjacent coil, as on figure 1 here:
https://www.mdpi.com/1996-1073/10/10/1492
You may just need to reverse the polarity of the magnets on one side.
 
Fellas,

Here was the problem: The magnets in the rotors were not a mirror of each other, so I have front rotor N,S,N.... then back rotor was S,N,S, so the fields were cancelling each other out, as pointed out by Peters and Major. Here is a picture with the flux no that both rotors are mirror images of each other.
 

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