Lua and FEMM 4.2

[lieuthnant]

In the picture is on the right, a square of steel and left a sensor with Magnet. I would like to move and gradually at its original position the square forward near as possible to the sensor and backward. This must to be cyclically. For that, i wrote a Programm in Lua but it doesn't work. I add the program and FEMM sketch. Perhaps someone from you sees which mistake i make.

 

[fnm]

At first sight I understand your drawing is not complete. You should define properties concerning area between air and steel
Can you post your lua script?