Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1988-08-24
1989-12-26
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
335216, 324320, H01F 700
Patent
active
048900826
ABSTRACT:
A coil for generating a homogeneous magnetic field has a first coil unit composing three pairs of coils each including a common central axis and being symmetric with respect to the center of the central axis and a second coil unit composing two pairs of coils provided outside of and axially with the first coil unit and being symmetric with respect to the center of the central axis. The magnetic moment of the first coil unit is identical in magnitude to and opposite in direction to that of the second coil unit, so that the magnetic field due to leakage flux is substantially cancelled out. Moreover, since each coil composing the first coil unit is selectively located in proper position and the amount of ampere-turn of each coil can be selected, it is possible to reduce to zero the coefficients of terms up to tenth order with respect to the strength distribution of magnetic fields on the central axis generated by the first and the second coil units, resulting in enhancing homogeneity of the magnetic field.
REFERENCES:
patent: 3287630 (1966-11-01), Gang
patent: 4385277 (1983-05-01), Hanley
patent: 4587504 (1986-05-01), Brown et al.
patent: 4701736 (1987-10-01), McDougall et al.
patent: 4799017 (1989-01-01), Siebold et al.
"The Coil Design of the Superconducting MRI Magnet" M. Fujita, Fuji Electric Corporate Research & Development Ltd.
"The Coil Design of the Superconducting MRI Magnet" M. Fujita et al.
Fuji Electric & Co., Ltd.
Harris George
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