Simulation with FEMM and LUA

I work at present with the software FEMM 4,2 and with the programming language LUA. I would like a steel of a sensor stand, to move. The steel is to drive as near as possible to the sensor and go back then. This is to take place Zyklysch. To present enclosed a picture around itself the whole. Does an idea have, how I can make that?
Ps: at left the Steel and at right the Sensor.