Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1991-10-04
1992-09-15
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
335306, H01F 702
Patent
active
051481383
ABSTRACT:
The invention relates to a cylindrical magnet apparatus for producing a uniform magnetic field in a predetermined direction within the cylindrical hole in the apparatus. The apparatus is suitable for use in NMR imaging. Essentially the apparatus is an assembly of a plurality of dipole ring magnets in a coaxially juxtaposed arrangement. Each ring magnet is constructed of a plurality of cross-sectionally trapezoidal segments which are arranged annularly, and each segment is an anisotropic magnet block magnetized in a suitable direction. To acquire a good balance between the material cost and the gross weight of the apparatus a selected portion of the assembly of dipole ring magnets is made of a rare earth alloy magnet, whereas the remaining portion is made of a ferrite magnet. In one embodiment of the invention, in each segment of each ring magnet an end part on the radially inner side of the ring magnet is made of a rare earth alloy magnet whereas the remaining part is made of a ferrite magnet.
REFERENCES:
patent: 4675609 (1987-06-01), Danby
patent: 4777464 (1988-10-01), Takabatashi
Barrera Ramon M.
Picard Leo P.
Shin-Etsu Chemical Co. , Ltd.
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