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US 6,812,583 B2Granted
Electrical generator with ferrofluid bearings
AssigneeRockwell Scientific Licensing, LLC
InventorsJeffrey T. Cheung, Hao Xin
Life of this patent
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Abstract
An electrical generator includes a magnet constrained to move relative to a conductor by a support structure, with a ferrofluid bearing providing an ultra low friction interface between the magnet and support structure. The assembly has a critical angle of displacement from a horizontal static position of less than 1 degree, and preferably less than 10 minutes. An electrical signal is generated in the conductor by the moving magnetic field.
Claims13
An electrical generator, comprising:
- a magnet constrained to move relative to an enclosure,
- a ferrofluid disposed between said magnet and enclosure to provide a low friction interface,
- a conductive coil disposed with respect to said magnet so that movement of said magnet relative to the coil generates an electrical signal in said coil, and
- a pair of end magnets on opposite sides of, and opposing polarity to said magnet to limit said magnet's movement.
1 more element
Dependencies are inferred from the claim text.