Homogeneous field magnet having pole shoes with pole piece means

Details Homogeneous field magnet having pole shoes with pole piece means Homogeneous field magnet having pole shoes with pole piece means

1994-03-09

1994-11-08

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

324319, G01R 3346, H01F 706

Patent

active

053630785

ABSTRACT:
The magnet contains a magnetic yoke and two pole shoes between which a magnetic field of high homogeneity is formed. The pole shoes are provided with special pole piece device. Each pole piece device is spaced from a base part facing the yoke by a narrow correction air gap. In accordance with the invention, each pole piece device contains two plate-like pole piece elements which are parallel to each other and spaced apart by a gap of predetermined width. In this connection, the plate element facing the base part has a relative permeability (.mu..sub.r 1) which is smaller by at least a factor of 5 than the plate element facing the useful volume, the relative permeability (.mu..sub.r 2) of which element is at least 10,000.

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Journal of Scientific Instruments (Journal of Physics E), 1968, Series 2, vol. 1, E. Boltezar et al.: A Permanent Magnet for a Nuclear Magnetic Resonance Spectrometer, pp. 323-325.
Vacuumschmelze GmbH, Hanau, DE, Richard Boll: Weichmagnetische Werkstoffe, 4th Edition, 1990, pp. 278-279.
Patent Abstracts of Japan, vol. 11, No. 36, 3 Feb. 1987 & JP-A-61 203 605 (Fuji Electric Co., Ltd.), 9 Sep. 1986.
IEEE Transactions on Magnetics, vol. 28, No. 1, 1 Jan. 1992, New York, U.S., pp. 931-934, M. G. Abele et et al.: Field Computation in Permanent Magnets.

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