Abstract: The construction of a yokeless permanent magnet structure with a cavity, which structure comprises a single layer of abutted magnetic prisms, is performed by first utilizing a reference point "F" for the construction such that point F lies on a equipotential line of zero potential. The point F must, furthermore, be selected so that it lies on a line which divides the magnetic flux within the cavity into two separate loops or parts. Beginning from point F, the magnet structure is then constructed from a series of precisely abutted prisms of magnetic material which form a cavity with a predetermined, uniform polygonal cross section. Using well known boundary value conditions between the cavity and the various prisms of the magnetic material, as well as the restriction that the exterior surface of the permanent magnetic must be an equipotential surface of zero potential, each prism, in turn, is constructed, until the entire permanent magnet is completed.

Abstract: A multipolar magnetic ring is fomred by joining together two rings having the same geometry and magnetic characteristics. The coaxial rings have circumferentially spaced apart teeth which form identical magnetic poles. The magnetic poles of each ring are embedded into the spaces separating the magnetic poles of the other ring. The magnetic poles of each ring have the opposite polarity to the polarity of the adjacent poles of the other ring.

Abstract: Devices and technique using specially configured switchable superconducting elements to achieve temporal and spatial modulation of magnetic fields created in the hollow of solenoids are provided.

Abstract: The magnet roll according to the present invention comprises (a) first and second shafts rotatable around the same axis relative to each other; (b) a permanent magnet member fixed around the second shaft and having a plurality of magnetic poles extending along the axis of the second shaft on its outer surface; (c) a first flange member connected to the first shaft and rotatably supporting one end of the second shaft; (d) a second flange member rotatably supported by the second shaft; (e) a hollow cylindrical sleeve made of a plastically deformable non-magnetic material and fixed to the first and second flange members on both ends such that it encircles the permanent magnet member rotatably relative to the permanent magnet member; and (f) an inner diameter-increased area provided in each side end portion of the sleeve, which receives each flange member and is folded inward over each flange member to fix the sleeve to each flange member.

Abstract: A cow magnet to be ingested by a ruminant animal comprises a stack of cylindrical permanent magnets having intermediate disk-like spacers of a soft magnetic material where the stack is held together by first and second plastic end cap members with integrally formed tubular sleeves adapted to fit into central bores formed through the cylindrical magnets and spacers with a predetermined friction fit. A pin formed from high carbon steel is then inserted down the center of the tubular sleeves to cause them to expand and tightly engage the side walls defining the central bore formed through the stacked arrangement of magnets and spacers.

Abstract: In a linear actuator provided with a first projection on a movable part which is linearly driven with the electromagnetic force, so as to engage with one end of a compressing coil spring, and/or a second projection on a stationary part as opposed to the movable part, so as to engage with the other end of the coil spring, and a cup-like washer interposed between said at least one of the projections and said coil spring, a washer is so adapted that said at least one of projections is allowed to collide with the inner bottom part thereof. The linear actuator may comprise a resin film of small friction coefficient interposed between the movable part and the stationary part destined to contact with each other, a thermosensitive resistor which has an opposite resistance-temperature coefficient of the coil and is connected in series to the coil, and/or a means for detecting the relative position of the movable part with respect to the stationary part.

Abstract: Demagnetization effects in any magnetic block are avoided by using a mixed magnetic material comprising a predetermined proportion of permanently magnetizable magnetic material and of non-magnetic material. The proportion is adjusted as a function of the ratio between the demagnetizing excitation and a so-called cut-off excitation of the material, for which the magnetization of the material drops considerably. Application to imaging by nuclear magnetic resonance.

Abstract: A superconducting magnet device includes a superconducting coil for generating a magnetostatic field, and a pulsating magentic field generating coil disposed on the inner diameter side of the superconducting coil. An inner cylinder of a thermal shielding tank located between the superconducting coil and the pulating magentic field generating coil is maintained at a temperature equal to or lower than the liquid nitrogen temperature. The inner cylinder is made of a superconductor which becomes superconductive at a temperature equal to or higher than the liquid nitrogen temperature. Further, a heating wire for heating the inner cylinder which is in a superconductive state to cause it to become normal conductive is provided on the inner cylinder of the thermal shielding tank in a direction in which it cuts across an induced current loop generated by the excitation of the static magnetic field.

Abstract: A passive shim assembly for a magnet having a central bore is provided. The passive shim assembly includes a plurality of axially extending guide rails bonded directly to the bore of the magnet and equally spaced circumferentially. A plurality of arcuately shaped drawers are slidably mounted between adjacent channel pieces. A plurality of stacks of arcuate strips of magnetic flux conducting material demountably secured to each of the drawers, the strips extending in the circumferential direction.

Abstract: An electromagnet is provided comprising a fixed yoke, a movable armature including a core concentric with an energization coil, and magnetizable plates separated from the yoke by a variable longitudinal air-gap, a return means providing the rest position of the armature, and a compensation device comprising a thin U shaped stirrup piece whose two legs cooperate with the ends of the plate, portions of this stirrup cooperate with inclined ramps of an adjustable rotary cam, placed concentrically with the core of the armature.

Abstract: An apparatus for installing shim guide rails in an MR magnet is provided including a plurality of beam members, one for every guide rail to be installed. A plurality of coaxial ring shaped members spaced apart from one another are joined together by the beam members. The beam members extend axially and are spaced circumferentially about the outer diameter of the ring shaped members forming a cylindrical open ended cage. Each of the beam members defines a plurality of radially extending spaced apart apertures. A plurality of ladder-like structures each of which is associated with a respective beam member is provided. Each of the ladder-like structures included two side pieces joined by a plurality of rungs extending between the side pieces. The rungs pass through the holes in the beam members with one of the side pieces situated inside the cylindrical cage and the other situated outside the cage.

Abstract: A superconducting magnetic element is provided wherein the terminals are bonded to the coil body and are independent of that coil body supporting structure. The technology employs a terminal structure with a supporting base member surrounding a conductor terminal end portion positioned on a surface of an impregnated coil body and integrally bonded thereto. The terminal structure in turn permits freedom in manufacturing to employ all useful strategies in accommodating physical properties of different materials.

Abstract: Micropole undulators for use in the generation of x-rays from moving charged particles are disclosed. Two rows of spaced apart poles are arranged so that each pole produces a magnetic field aligned with all other similar fields. The poles are the ends of "C"-shaped magnets. In each row, adjacent poles are separated by spacers made of a superconducting material.

Abstract: A permanent magnet for an electric lens including at least two ring-shaped permanent magnets, wherein a yoke comprised of a ferromagnetic body having the same inner and outer diameters of adjacent ring-shaped permanent magnets to be inserted into a portion between said both ring-shaped permanent magnets, and said yoke is comprised of a sintered alloy and is provided with one groove or more for taking out a lead wire of a coil assembled in said yoke and said ring-shaped permanent magnets.

Abstract: The Meissner effect is employed to generate a magnetic bottle in the interior region of a hollow superconductor, such as a hollow cylinder. One or both ends of the interior region of the hollow superconductor may be uncapped to permit coupling from the exterior to the interior of the superconductor.

Abstract: A coil-like conductor of superconducting material is made from a solid element of sintered superconducting oxide, having a high critical temperature, with the shape of said conductor being imparted thereto by machining the solid element, thus constituting a self-supporting structure.

Abstract: A superconducting magnetic assembly has a first superconducting coil for generating a magnetic field in an internal magnetic space in the first superconducting coil, a pair of second superconducting coils one provided at each end of the first superconducting coil for generating a cancelling magnetic field counteracting a leakage magnetic field leaking from the magnetic field in the internal space, and a magnetic shield of a superconducting material surrounding the first superconducting coil so as to be open to the internal space.

Abstract: A magnetic trip device having two plunger cores cooperating respectively with polar parts of a fixed magnetic circuit excited by a coil. The effects of the plunger cores are opposing, and by adjusting the inital position of the moving core assembly constituted by these two plunger cores, the tripping thereshold can be adjusted with a large amplitude.

Abstract: A high torque rotary solenoid is disclosed employing attracting and repelling forces of permanent magnets to induce rotary motion is disclosed. Four arrays of magnets are located on a stator and rotor and are arranged along the axis of rotation of a shaft. Two magnet arrays are located on the stator, and two magnet arrays are located on the rotor. Each of the magnet arrays on the stator is arranged to come in close proximity to one of the magnet arrays on the rotor when the rotary shaft is positioned to the clockwise or counterclockwise rotary motion limits. The rotary solenoid has two rotational positions, each position corresponding to the mechanical limits of rotational movement.

Abstract: A magnetic gripping apparatus, of the permanent magnet type, comprising a base plate and peripheral walls, at least a first and a second pole units, each pole unit comprising a main pole piece having an outer face defining a gripping surface, main permanent magnets arranged between said main pole pieces and said base plate, an intermediate pole member between said first and second pole units, said intermediate pole member extending from the base plate to the gripping surface and secondary magnets between the pole members and the pole pieces; a first electrical windings encircles each main magnet, said electrical winding being operatively conected to a control unit, and a residual flux eliminating circuit comprising a second electrical winding encircling said intermediate pole member, said second winding being operatively connected to a demagnetizing control unit.