In this video, Meindert Norg from Norg Consulting demonstrates his active magnetic bearing, Tripod Floater. The closed-loop system uses three Pololu 18v15 high-power motor drivers as PWM amplifiers to power the magnetic coils that keep the module floating beneath the metal plate.
February, 2010 update: the Tripod Floater is now wireless:
Featured link: http://www.youtube.com/watch?v=e-f_H68Rl4g
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