Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1992-06-02
1993-06-01
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
H01F 702
Patent
active
052164012
ABSTRACT:
A permanent magnet having a shell of magnetic material and a hollow cavity. An access port passes through the shell and communicates with the cavity. The shell is permanently magnetized to produce a substantially uniform magnetic field in the cavity. The magnetization of the shell is the resultant of magnetization components M1 and M2. Components M2 are uniform in both magnitude and direction while components M1 are uniform in magnitude and nonuniform in direction. Also, components M1 and M2 are substantially equal in magnitude to each other and, in the regions adjacent the access port, are aligned in opposite directions. The shell comprises a plurality of magnetic segments and each segment is uniformly magnetized. In accordance with one embodiment, the shell and cavity are concentric spheres, and the access port includes an axial hole that passes through the spherical center. In another embodiment, the shell and cavity are spherical, and the access port is a gap that passes through the shell at its equatorial plane. In still another embodiment, the shell and cavity are cylindrical, and the access port is a narrow gap. The gap lies in a plane that includes the cylindrical axis.
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Anderson William H.
Barrera Raymond
Picard Leo P.
The United States of America as represented by the Secretary of
Zelenka Michael
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