Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1985-09-30
1987-01-06
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
324318, H01F 700
Patent
active
046350179
ABSTRACT:
The magnetic apparatus of a nuclear spin tomography system contains several magnet coils which are surrounded by an approximately cylindrical shielding device of ferromagnetic material. This shielding device comprises at least four beam-like shielding elements of substantially identical design which are arranged regularly distributed in the circumferential direction on a common cylinder surface and, at their end faces, a disc-shaped part with a central opening having a predetermined radius relative to the cylinder axis. In this shielding device, the magnetic stray flux is to be reduced further. For this purpose, the invention provides that at each of the two end faces of the shielding device, two additional shielding plates are arranged parallel to each other such that they extend each of the beam-like shielding elements in the longitudinal direction beyond the corresponding disc-shaped part by a predetermined amount. In addition, at least two elongated shielding plates lying in two parallel planes with a predetermined width can be provided which are parallel to and spaced from the beam-shaped shielding elements of the shielding device and which extend beyond the respective end faces by a predetermined amount.
REFERENCES:
patent: 4156862 (1979-05-01), Hansen et al.
patent: 4490675 (1984-12-01), Knuettel et al.
Harris George
Siemens Aktiengesellschaft
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