Can someone confirm this in FEMM?

[robbie47]

Broli, can you share your FEMM file(s)? I may be able to to some work on them

[broli]

I didn't use FEMM, I used Vizimag like I mentioned in the first post. I never got used to FEMM so I'm asking someone who's proficient with it to simulate the same thing and calculate the integral along the x axis. It shouldn't be that big of a task unless FEMM can't calculate integrals.

[0c]

@broli,

I am aware of a simple pendulum-like experiment with some similarity to your configuration, that does seem to show a gain, at least in one direction. But when the pendulum swings the opposite direction, there is a loss. It's nowhere near a 450% gain, only a few percent, but this is not a simulation. Maybe you guys can help each other.

The video: http://www.youtube.com/watch?v=SP_o1_jBUSM

Discussion: http://www.fizzx.com/viewtopic.php?t=415

[robbie47]

Broli, I did some quick FEMM simulation with 3 equally sized Neo's.
My force graph looks quite different from yours.
Entering the static magnets and leaving them shows positive forces, but the force is negative when the moving magnet is just in between the two static ones.
I see also COP however

[broli]

robbie47 you should be careful. That is the graph of the scalar field strength along the x axis. The graph I show shows the component of the field vector that is only parallel to the x axis. I hope that makes sense.

Edit: On second thought that doesn't even look like two magnets in repulsion. The field can't be at its maximum at the center it should be 0! robbie47get your simulation straight! Also you should not have 3 magnets present when doing the integral calculation! you need to know the field 2 magnets in repulsion cause not the resulting field a 3 magnet has on the.m