Did the thing at the ETH, Department PES (Power Electronic Systems Laboratory tinkered). A controller controls the current through an electromagnet on the basis of information from a magnetic sensor so that the magnet (the silver, cylinder-shaped thing) in the airborne. The screw down I stuck to the magnet (magnetic), thus the first magnet is a bit stronger and secondly, to "stand" of the magnet is a bit more stable in the air can, because his magnetic focusing so above seines Masseschwerpunktes zu liegen kommt (bin mir nicht ganz sicher, ob diese Erklärung richtig ist, aber es funktioniert auf jedenfall :P).
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