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US 4,451,811 AGranted
Magnet structure
AssigneeLitton Systems, Inc.
InventorGeorge J. Hoffman
Life of this patent
Estimating the term…
Abstract
A magnet for use in a bearing, such magnet preferably having a cylindrical bore to receive a shaft and ferrofluid between the shaft and the bore walls. The magnet is magnetized with its internal magnetization radially directed relative to the axis of the bore.
Claims4
A permanent magnet comprising:
- a two-poled permanent magnet structure having a circularly cylindrical bore therethrough, the interior of said bore forming one of said poles, said bore having an axis of symmetry;
- said structure being divided circumferentially of said bore into a plurality of substantially contacting circumferential segments each having an inner surface which is a circumferential segment of the cylindrical surface of said bore;
- all of said segments being magnetized along their entire length and about the entire portions of said circumference with their internal magnetizations identically poled in a radical direction relative to said axis and their pole strengths to be substantially equal, to cause substantially the entire surface of said circumferential segments of said bore to become identically and substantially uniformly poled magnetic pole faces of said segments.
Dependencies are inferred from the claim text.