Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1990-01-25
1992-09-08
Tolin, Gerald P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
335301, 336230, H01F 500, H01F 700, H01F 2728
Patent
active
051461978
ABSTRACT:
A first set of three spherically or elliptically shaped coils is provided which generates a homogeneous linear gradient magnetic field in its interior. A second set of three spherically or elliptically shaped coils is located concentric to and in close proximity with the first coil set such that the fringing fields outside the second coil set are substantially zero. The coil sets can be separated at their equator and preferably are spherical in shape. The current distribution for each coil is described as well as the winding pattern on the surface of the first sphere which generates the perfectly homogeneous linear gradients inside the sphere. The second concentric sphere having a second coil set thereon which has a similar current distribution and winding pattern to the first coil set such that it will perfectly shield the inner sphere while reducing the linear gradient inside the first sphere by only a factor of 1-(R.sub.1 /R.sub.2).sup.5, where R.sub.1 and R.sub.2 are the radii of the inner and outer spheres, respectively.
REFERENCES:
patent: 2265041 (1941-12-01), Hipple
patent: 3052859 (1962-09-01), Bers
patent: 3493904 (1970-02-01), Favereau
patent: 3510832 (1970-05-01), Golay
patent: 3515979 (1970-06-01), Golay
patent: 3566255 (1971-02-01), Jaynes
patent: 3582779 (1971-06-01), Bloom
patent: 3622869 (1971-11-01), Golay
patent: 4820988 (1989-04-01), Crooks et al.
Daniels et al., A Large Volume Homogeneous Low Field Electromagnet, 1971, pp. 576-581, CJP (49).
CJP: Canadian Journal of Physics.
Barrera Raymond
Tolin Gerald P.
University of Pittsburgh
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