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US 4,359,706 AGranted
Magnet pole pieces and pole piece extensions and shields
OwnerArnold Flackinventor
Life of this patent
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OwnerArnold Flackinventor
Estimating the term…
Pole piece structures for permanent magnets and electromagnets, more particularly for superconducting electromagnets, and pole piece extensions and shields adapted, separately and in combination, to achieve a high concentration of the magnetic flux along the principal magnetic axis of the pole pieces, and preventing magnetic flux leakage and dispersion. The pole pieces are preferably conical or frusto-conical, or in the form of hollow cylinders or conical cylinders or, alternatively, provided with a tapered step ending in a pointed cylinder, a flat cylinder, or a hollow cylinder. The pole piece configurations provide a high concentration of magnetic flux intensity in the magnetic gap between the pole pieces either along the centerline of the pole pieces or in a cylindrical space disposed axially along the centerline of the pole pieces. Pole piece extensions, or field concentration members in the form of cylindrical, frusto-conical, helical shields or, alternatively, in the form of cylindrical, frusto-conical, single or multiple concentric shields, are disposed around the pole pieces as a further arrangement for shaping the magnetic flux and concentrating the high intensity magnetic lines of force in an appropriate region of the magnetic gap between the ends of the pole pieces, thus producing a high flux intensity in a predetermined region of the gap space in applications where such a controlled high intensity magnetic flux is required, as, for example, for magnetically confining a critical mass of ions, such as deuterons and tritons in an energy fusion reaction.
In combination, a magnet pole piece having a frusto-conical end portion and a magnetic field correction member for the magnetic field formed by the magnet pole piece, said correction member comprising at least one hollow shield member attached to the frusto-conical end portion, said hollow shield member being made of magnetic material, wherein said hollow shield is in the form of a generally conical diverging helical strand of said magnetic material.
In combination, a magnet pole piece having a frusto-conical end portion and a magnetic field correction member for the magnetic field formed by the magnet pole piece, said correction member comprising at least one hollow shield member attached to the frusto-conical end portion of said pole piece and surrounding said pole piece frusto-conical end portion, wherein said hollow shield member is made of magnetic material and comprises a plurality of tubular cylindrical elements disposed concentrically about the periphery of said pole piece frusto-conical portion and projecting beyond the end of said pole piece, wherein said tubular cylindrical elements have progressively increasing wall thickness from the outermost element to the innermost element.
In combination, a magnet pole piece having a frusto-conical end portion and a magnetic field correction member for the magnetic field formed by the magnet pole piece, said correction member comprising at least one hollow shield member attached to the frusto-conical end portion of said pole piece and surrounding said pole piece frusto-conical end portion wherein said hollow shield member is made of magnetic material and comprises a plurality of tubular cylindrical elements disposed concentrically to each other about the periphery of said pole piece frusto-conical portion and projecting beyond the end of said pole piece, wherein said tubular cylindrical elements are frusto-conical and disposed substantially parallel to each other.
In combination, a magnet pole piece having a frusto-conical end portion and a magnetic field correction member for the magnetic field formed by the magnet pole piece, said correction member comprising at least one hollow shield member attached to the frusto-conical end portion of said pole piece and surrounding said pole piece frusto-conical end portion, wherein said hollow shield member is made of magnetic material and comprises a plurality of tubular cylindrical elements disposed contrically to each other about the periphery of said pole piece frusto-conical portion and projecting beyond the end of said pole piece, wherein said tubular cylindrical elements are frusto-conical and of decreasing conicity from the outermost of said elements to the innermost of said elements.
A method for confining and straightening a magnetic field produced in a gap between a pair of opposed pole pieces of a magnet, each of said pole pieces having an end face, said method comprising disposing a hollow pole piece extension surrounding each of said pole pieces and extending beyond the end of each of said pole pieces, said pole piece extension being made of magnetic material, providing the end face of at least one of said pole pieces with a recess forming an edge producing a concentrated straight magnetic flux of high magnetic intensity, and arranging said pole pieces extensions in such manner as to curve the magnetic lines of force proximate the periphery of said magnetic field towards the center of said magnetic field, wherein said pole piece extension is in the form of a progressively enlarging diameter shield of magnetic material.
A method for confining and straightening a magnetic field produced in a gap between a pair of opposed pole pieces of a magnet, each of said pole pieces having an end face, said method comprising disposing a hollow pole piece extension surrounding each of said pole pieces and extending beyond the end of each of said pole pieces, said pole piece extension being made of magnetic material, providing the end face of at least one of said pole pieces with a recess forming an edge producing a concentrated straight magnetic flux of high magnetic intensity, and arranging said pole piece extensions in such manner as to curve the magnetic line of forces proximate the periphery of said magnetic field towards the center of said magnetic field, wherein said pole pieces extensions are each in the form of a plurality of separate concentric tubular members of magnetic material.
A method for confining and straightening a magnetic field produced in a gap between a pair of opposed pole pieces of a magnet, said method comprising disposing a hollow pole piece extension surrounding each of said pole pieces and extending beyond the end of each of said pole pieces, said pole pieces extension being made of magnetic material, providing said pole pieces with an edge producing a concentrated straight magnetic flux of high magnetic intensity, and arranging said pole piece extensions in such manner as to curve the magnetic lines of force proximate the periphery of said magnetic field towards the center of said magnetic field, wherein at least one of said pole piece extensions is made of a generally conical diverging helical strand of magnetic material.
Dependencies are inferred from the claim text.