Abstract: An alternating current electromagnet with a magnetic core assembly is provided with a unique design for a sideplate. The sideplate has a slot with a lateral opening. In assembling the sideplate onto the side of the magnetic core, the slot receives a shading coil. A portion of the sideplate forming the slot extends across a channel formed in a pole face of the core to lock the shading coil into the channel along the sides of the core. The sideplate is formed in a C-configuration and interconnects two L-shape cores arranged in a C-configuration with a gap existing between the confronting faces of the lower legs of the cores.

Abstract: A two stage cryocooler sleeve is provided having a second stage heat exchanger system capable of achieving lower temperatures than the first stage heat exchanger. A current lead comprising a ceramic superconductor having a critical temperature greater than the operating temperature of the first stage is tapered. The broader end is thermally coupled to the first stage heat exchanger and the narrow end coupled to the second stage heat exchanger. The tapered ceramic lead reduces the heat conduction from the first heat exchanger to said second heat exchanger.

Abstract: A magnetic system comprises a frame with at least one coil arranged coaxially thereon and providing for the setting-up of a magnetic field, and a cooling system. Wound in layers on a former of each coil are conducting and insulating tapes encompassed by a serving on an outer surface. Means for circulating coolant are disposed in close proximity to end surfaces of the coils, a gap being provided to allow flow of said coolant between the end surface of the coils and said means. The end surfaces of the coils are formed substantially by extremities of the conducting and insulating tapes.

Abstract: In a coil for an electromagnetic relay, a delayed response is achieved by a short-circuit tube which carries the coil member and replaces a plastic tube which is otherwise used. The short-circuit tube is extrusion coated at its ends with the coil flanges so and a thin insulating layer is provided on the short-circuit tube under the winding in the region between the flanges. The dimensions of the winding and the core are not increased while a considerable delayed response for the relay is provided.

Abstract: A magnetic coil comprising a plurality of conductors is designed by calculation of the continuous current density required on the surface on which the conductors are positioned to generate a specific magnetic field on a further target surface or at specified points.

Abstract: A support structure for a superconducting solenoid magnet has a set of five symmetrically and coaxially arranged nonferrous support rings. The central support ring mounts two magnet coils and the other four rings each mount one magnet coil so as to restrain the magnet coils from collapsing toward the center along the magnet bore axis and also to resist radially and circumferentially acting hoop stresses to which the coils are subjected. Tubular struts are symmetrically arranged about the magnet bore axis between adjacent support rings and are seated at their ends in counterbores in the support rings to separate and space apart the support rings. Threaded rods extend through the tubular struts and adjacent support rings to fasten the adjacent rings together.

Abstract: A lagged type solenoid capable of carrying out the plunger advancing operation at a speed lower than the plunger retreating operation. For this purpose, the solenoid includes a plunger lagging mechanism, which includes an air discharge passage for discharging air in a plunger moving space to an ambient atmosphere during the plunger advancing operation and an air supply passage for supplying air from the ambient atmosphere to the plunger moving space during the plunger retreating operation which is formed into a sectional area larger than the air discharge passage. The air supply passage is closed by a check valve during the plunger advancing operation. Thus, the plunger advancing operation takes place at a speed lower than the plunger retreating operation.

Abstract: A Stud Finder includes a one-piece magnet assembly molded from a moldable plastic material containing a dopant capable of being permanently magnetized along a desired axis. The one-piece magnet assembly includes integral pivot bosses for pivotably supporting the magnet assembly in a location where it can be influenced by the nearby presence of magnetic metals such as steel nails. The plastic material is capable of accepting integral coloring.

Abstract: A ferromagnet material having a high permeability and saturation magnetizon at low temperatures is used to induce superconducting currents in a ring of a superconducting material where the ferromagnet material has a lower transition temperature than the superconductive material.

Abstract: A permanent magnet structure comprising one or more truncated hollow cyliical flux source (HCFS) segments with the end faces of each segment covered by superconducting sheets. In the case of a plurality of axially aligned segments, the array may be arranged to provide a periodic magnet structure suitable for use in a wiggler.

Abstract: An electromagnetic acutator device for selecting needles in a knitting machine comprises two windings (3,4) positioned on opposite sides relative to an armature (5) in a support structure (2) made from a ferromagnetic material. The armature (5), which is also made from a ferromagnetic material, is hinged onto the structure (2), according to an axis substantially perpendicular to the axis of the windings (3,4) and is subject to the action of the magnetic filed generated by the windings (3,4) in order to be moved between two angular positions. The armature is hinged at one end engages a selection lever (11) at its other end, and has a configuration with two transversal portions (19, 20) protruding from opposite sides, and penetrating inside the interior of the windings (3,4).

Abstract: A method of forming slots in the coupling disc (e.g., the armature or rotor) of an electromagnetic coupling such as a clutch or brake. The method is carried out by effecting relative movement between the coupling disc and a laser beam in such a manner as to cause the beam to trace the perimeter of the slot to be formed and to cut a slug of material from the disc. Also disclosed are coupling discs in which opposing side walls of the slots converge toward one another and in which the side walls are concentric but obliquely inclined.

Abstract: A shield for electromagnetic radiations comprising a laminated sheet having exterior layers of copper which sandwich an interior layer of a ferromagnetic alloy taken from the class consisting of nickel-iron compounds having from about 42 to about 80 percent nickel by weight and iron as a substantial portion of the remaining material. The layers are metallurgically bonded to each other by sintering or the like. According to a second embodiment, a laminated sheet is provided having exterior layers of copper which sandwich plural interior layers of ferromagnetic material, the layers of ferromagnetic material having progressively higher permeability and being capable of shielding interference of progressively lower energy level when travelling in a direction away from the direction of the source of interference. A typical laminated sheet in the direction away from the source of interference is copper/permendur/80/copper.

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.

Abstract: Periodic permanent magnet structures comprise a plurality of paired axially ligned sections of hollow spherical flux sources each of which produces a uniform high-field in its central cavity. Each pair of sections is mounted on opposite sides of a respective plate of permeable material. The magnetic field orientations in the central cavities are axially directed and alternate or reverse in direction from section to section. An axial bore hole drilled through the sections and plates provides a continuous channel or path through which a beam of charged particles will travel.

Abstract: A solenoid assembly includes a coil bobbin having a pair of hooks extending in the longitudinal direction of the bobbin from a flange formed on one end of the bobbin and projecting radially outwardly from the axis of the bobbin at the ends thereof. A magnetic yoke having openings for receiving the hooks and a grommet having a base portion in contact with the magnetic yoke are seucred together by the hooks. The grommet has a neck portion extending in the axial direction of a magnetic core and a central opening for a lead wire to a coil on the bobbin. The magnetic yoke is fixed to one end of the magnetic core which is located in a central opening formed in the coil bobbin. A plastic casing is then molded about the entire assembly.

Abstract: An RF coil arrangement (23) in a magnetic resonance apparatus wherein a static magnetic field for application to a body under examination is produced in a gap (3) between a pair of pole pieces (5). The RF coil arrangement comprises at least one coil (45 or 47) having a first part (49,51) fixed secured to a part (5) of the apparatus adjacent the gap and a further part (53) which is detachably electrically connected to the first part to provide easy access to the gap when placing in, or removing from, the gap a body to be imaged. The further part of the coil may be wholly detachable from the first part or pivotally mounted on a first portion (49) of the first part and detachable from a second portion (51) of the first part on pivotal movement of the further part with respect to the first portion of the first part.

Abstract: A permanent magnet type demagnetizing head has a first magnetic part disposed on a front part(21a.sup.1, 21a.sup.2, 21a.sup.3) of a tape running surface of a magnetic material, a second magnetic part (21c) disposed on a rear part of the tape running surface and a non-magnetic part or a feeble magnetic part (21b) disposed between the first and the second magnetic parts in the tape running direction; and the first magnetic part is magnetized in a magnetic pattern having plural magnetized regions of one or more N-pole and S-pole; the second magnetic part is magnetized in a magnetic pattern of alternating stripes of N-pole regions and S-pole regions, the boundaries between neighboring N-pole regions and S-pole regions are inclined, and the intensity of magnetization are gradually reduced in the tape running direction.

Abstract: A solenoid has a coil with an outer core and an inner core. The cores provide the magnetic circuit around the coil. The inner core includes a rotor which has radially extending armatures. The armatures are positioned in gaps between radially extending poles of the outer core so as to form air gaps between the poles and the armatures. When the coil is energized, the armatures are attracted to the poles and cause the rotor to rotate, thereby closing the air gaps. The shaft is coupled to the rotor through a drive mechanism so as to rotate with the rotor. The shaft is made of a material with a relatively high magnetic permeability, as are the inner and outer cores, so that the shaft is magnetically coupled to the inner core rotor. When the rotor stops rotating, the shaft also stops. A return spring returns the rotor to its deenergized position when the coil is deenergized, recreating the air gaps. The drive mechanism allows the shaft to remain stationary while the rotors return to the deenergized position.

Abstract: Relay drive for a polarized relay having an armature that can be moved in at least one working air gap provided between two pole faces of a split yoke and at least one permanent magnet, as well as a coil permeated with parts of the yoke, or a core directly connected therewith, wherein at least one pole face cooperating with the armature or located thereon is formed from one pole face of the permanent magnet and another pole face cooperating with the armature or disposed thereon is formed either by a pole face of another permanent magnet or of a soft-iron part, said soft-iron part being interchangeable with a permanent magnet of the same size.