| 摘要 |
An intriguing and educational display structure ( 1 ) appears to be spinning upon itself without any apparent drive mechanism, power supply or bearing. The structure comprises two concentric hollow spheres ( 3, 5 ) spaced apart by a transparent fluid ( 6 ). The outer sphere is totally transparent, immobile, and may rest on a tripod ( 2 ) or other type of support. The inner sphere may be partially transparent or translucent and carries over its surface, a design such as a map of the world ( 7 ). The inner sphere rotates within, and independently from, the first outer one. The internal, that is self-contained, drive mechanism uses either a conventional electrical motor ( 8 ) with its own field winding and commutator, or one made of a rotor comprising a cross-array of electromagnets (AC, BD) that interact with an ambient magnetic field such as the earth magnetic field. The power supply comes preferably from a photovoltaic collector ( 13 ) mounted within the inner sphere or from a receiver ( 27 ) of RF waves or other EM radiation.
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