Have a look at this Levitating Rotating Globe that Alexey Sha built. Not content with the standard levitating products out there he decided to step it up a notch.
“There are many globes available today which are levitating and rotating along vertical axis. This one is the world first globe levitating and rotating along TILTED axis. It uses wireless power transmittance and geared motor inside the floating globe. In brief, frequency generator is built around micro controller, a square wave output is directed to MOSFET which drives primary coil (10 turns) of output circuit. Secondary coil forms parallel LC circuit (20 turns and 25 nF) and serves as transmitting antenna. Generator frequency can be manually tuned around resonant value to control speed of rotation.
Receiver coil is a parallel LC circuit (~2.5 nF and ~60 turns of wire). It is connected to rectifier bridge. DC geared motor (made of micro servo, modified for continuous rotation) is powered by inductive resonant coupling. Receiving coil, electrical components, and tilted motor are fixed on the floating base. Their locations are adjusted to maintain center of gravity. The globe’s outer shell is directly attached to the motor shaft.”
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