Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1986-09-19
1987-07-07
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
335306, 324319, H01F 702
Patent
active
046790225
ABSTRACT:
A magnetic field generating device for nuclear magnetic resonance-computerized tomography of the type wherein permanent magnet assemblies of a pair opposing mutually to define an air gap therebetween are magnetically coupled together by yoke means to create a magnetic field within the air gap is provided, which is characterized in that each permanent magnet assembly comprises a flat plate-like central permanent magnet and peripheral permanent magnets arranged around the central permanent magnet and inclined toward the inside of the air gap, the magnetic pole surface of each permanent magnet assembly forms a curved concave face with respect to the air gap, and each permanent magnet is magnetized in the direction perpendicular to the corresponding magnetic pole surface, whereby the leakage flux is reduced and the magnetic efficiency is enhanced, thus, reduction of the device dimension and weight can be achieved.
REFERENCES:
patent: 3412352 (1968-11-01), Watson
patent: 4580098 (1986-04-01), Gluckstern et al.
patent: 4647887 (1987-03-01), Leupold
Hayashi Hiroo
Miyamoto Toshinobu
Ohnishi Youichi
Sakurai Hideya
Takabayashi Hirofumi
Harris George
Sumitomo Special Metal Co. Ltd.
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