The SMOT (PM3.2)

[Low-Q]

Wouldn't I get the same effect of iron if I just moved the metal stator's further away? I have tried some other models of motor's as well and it seems to me that there is always a sticky place. I think it may need to be un-symetrical in design.

The metal plates attract the rotor magnets all the time. Where the rotor magnet has just passed the corner of one statormagnet, it will be more or less repelled.
I have however done more simulations in FEMM, and it shows that if I encrease accuracy in mesh size and encreased the number of contour lines, plot points, and line integral points, the total simulated output is decreasing rapidly. I used first mesh size of 0.5, which displayed an average of 74Nm. In a non working motor this average is 0. So did I reduce mesh size to 0.2, and now the average output is 5.7Nm. So if I can predict the outcome with infinite accuracy, the average output would be 0.

So FEMM might be good enough to predict reality, if you have high enough accuracy and plenty of processor power in you computer (It takes much time to calculate all these measurements with high accuracy)

Vidar

[hanglow]

Low-Q are you saying it will not work even with magnets on the stator?

[Low-Q]

Low-Q are you saying it will not work even with magnets on the stator?

After further research, I just indicates that the device will never work as the data I simulates varies so much just because of changes in samples, accuracy etc. At least the data measured is nothing to base the real life on. However, the data simulated is allways on the same side of the +/- scale, so maybe that's an indication on that it WILL work. I don't know for sure.

Vidar

[Thaelin]

   Once again, a sim program is only as good as its programmer. On of the best on the market missed the res point of a coil/cap pair by far enough to be in error for what I wanted. It did prove that the circuit would work but had to tweak it a bit to settle in on the right freq.
   On using it for magnets, age old point, 2d not 3d. So far femm dont do magnets very well. I trusted a design from a sim and spent the bucks for the magnets, yup you guessed it. Not gona work. I would love to see a sim made that would do magnetic fields correct. So on we go.......

thaelin

[hanglow]

I'm going to rebuild this one with 16 magnets and put some magnets on the side. It may take me a few days. Maybe I can try some shielding to get past the sticky points.