Abstract: The invention is a magic sphere having an equatorial gap, with a radial metic field in the equatorial gap. The radial magnetic field can flow inward, toward the center of the magic sphere, or outward, away from the magic sphere. In a further embodiment, the magic sphere produces a periodically radial magnetic field. In another embodiment, a magic sphere with an azimuthally periodic radial magnetic field that flows in the outward direction periodically magnetizes a magnetically hard ring in the outward direction. Then, a magic sphere with an azimuthally periodic radial magnetic field that flows inwardly, periodically magnetizes the ring in the inward direction. The result is a permanent magnet that has a radial magnetic field, where the direction of the field periodically alternates from the inward to the outward direction.

Abstract: In a thermal switch device having a reed switch, a temperature-sensitive magnetic cylinder (1) and cylindrical permanent magnets (2a, 2b) disposed around the reed switch (3), and an insulator case (7), the case is provided with an inner cylinder (5) formed in an inner space of the case. The reed switch is supported in the inner cylinder, and the temperature-sensitive magnetic cylinder and the cylindrical permanent magnets are fitted on the inner cylinder. A heat conductor member (6) is attached to the case to be partially exposed outside the case while partially be in contact with the temperature-sensitive magnetic cylinder and the cylindrical permanent magnets.

Abstract: An electrical switching device prevents moving contacts from welding to stationary contacts in a switching device. This is achieved using an auxiliary magnet system in the main current path, which system produces a contact pressure force corresponding to the excitation current so that no arcs are produce between the contacts when overcurrents and short-circuit currents occur. The moving iron core of the auxiliary magnet system is for this purpose connected to the contact link mounting via which the contacts are switched on and off.

Abstract: Electromagnetic shielding device for nuclear magnetic resonance apparati, having a cavity (5) with at least one or more openings for introducing the body (K) or the part thereof under examination, which cavity (5) is defined by at least one magnet (1) for generating a static field, one or more coils for generating a magnetic field gradient (2), one or more coils (3) for generating spin-exciting radio-frequency pulses, and one or more coils (4) for receiving echo signals. The transmitting (3) and receiving coils (4) are contained in an electromagnetic shielding structure (7, 7', 7"), at the openings of the detection cavity (5), whereat the shielding structure may be closed by removable shielding elements (9, 10, 18, 20), electrically connectable thereto.

Abstract: An open electromagnet for use in MRI apparatus includes a pair of field coils which respectively comprise juxtaposed poles between which an imaging volume of substantially homogeneous magnetic field is defined. A support structure, which serves rigidly to support the field coils in spaced apart relationship, includes two steel plates between which the field coils are positioned. The relative position of the field coils and the plates is selected such that forces of magnetic attraction between the field coils are at least partly counter-balanced by forces of attraction between the plates and the field coils. In this manner, the force on the field coils and their associated support structure due to the forces of attraction between the poles is significantly reduced or nullified.

Abstract: An electromagnetic relay is provided having a base; a motor assembly mounted on the base, the motor assembly including a coil, a core and a frame; an armature pivotably mounted on the frame; a first electrical contact mounted to the base; a movable elongated member biased against the armature at least at two points such that movement of the armature is restricted and the armature is disposed toward an initial position spaced from the core; and a second electrical contact mounted to the movable elongated member and operatively associated with the first electrical contact.

Abstract: The trip bar is sub-divided into a first actuating part associated to the trip rod of the actuator and a second actuating part operating in conjunction with the indicating device. A mechanical coupling link is arranged between the two actuating parts being adjustable between a coupled position and a disengaged position. An operating lever performs locking of the second actuating part in the active position to keep the fault information on the indicating device, whereas the first actuating part returns automatically to the inactive position when said mechanical link is in the disengaged position.

Abstract: The invention relates to a starter motor switch in which there are arranged a stationary magnetic core and a winding at the center of which a plunger moves to act on a rod, a portion of which carries a contact intended to establish contact between two terminals, of the type in which the stationary core delimits a chamber and a chamber and of the type in which the stationary core has a cavity in which a portion of the rod is accommodated, wherein it comprises a sealing partition comprising a transverse plate resting against the front face of the stationary core, which is extended by a rim which interacts in a sealed manner with the cover, and comprising a central part, the shape of which complements that of the central cavity with which it interacts in a sealed manner.

Abstract: In the installation of a superconducting magnet for magnetic resonance imaging at a preselected position in a mobile van, preselected curvilinear magnetic segments are applied to preselected locations on the exterior of the magnet to counteract magnet inhomogeneities in the imaging bore which would otherwise occur because of magnetic material in the van structure.

Abstract: A solenoid includes a ferrofluid in gaps between the moving and stationary elements which ferrofluid reduces noise caused by activating a plunger positioned within the solenoid. A permanent magnet can be included as a solenoid element to increase magnetic field strength within the solenoid to retain the ferrofluid within the solenoid.

Abstract: In an electromagnetic relay in which a contact mechanism 50 provided on a base 10 is driven by a card 60 which slides and moves in parallel to the axis of an electromagnet block 20 provided in the base 10 as the electromagnet block 20 is magnetized and demagnetized, the base 10 comprises a guide portion 17 for restricting the card 60 in its position. This prevents variations in the performance characteristics so that high productivity and long service life of contacts can be obtained.

Abstract: An improved magnetopermanent plate, constituted by a metallic body with high magnetic permeability, in the active plane of which there are provided hollow seats for accommodating corresponding coils composed of turns of electrically conducting wire covered with a sheath made of a material based on fluorocarbon resins; the turns are further mutually bound by means of a vitreous medium and are enclosed in a likewise vitreous protective element; the coils can be accommodated in the hollow seats, between which magnetopermanent means with a low polarization temperature coefficient are accommodated; means are provided for retaining the coils in the corresponding hollow seats.

Abstract: A reed relay includes a reed switch with contacts, and a pair of terminals connected to the contacts. A tubular electrostatic shield defines an axially extending central bore within which the reed relay is inserted. A coil assembly has a winding drum, and a coil provided on the winding drum. The winding drum defines an axially extending central bore within which the electrostatic shield is inserted with the reed switch. A first pair of leads extend oppositely to each other, and are connected to the electrostatic shield at the opposite ends of the coil assembly. A second pair of leads extend oppositely to each other, and are connected to the electrostatic shield at the opposite ends of the coil assembly. A third pair of leads extend oppositely to each other, and are connected to the coil at the opposite ends of the coil assembly. A fourth pair of leads extend oppositely to each other, and are connected to the terminal of the reed switch at the opposite ends of the coil assembly.

Abstract: Proposed is an improvement in an opposed-magnet magnetic circuit assembly with permanent magnets suitable for use, for example, in an MRI instrument comprising a pair of upper and lower permanent magnets to form a magnetic-field gap space therebetween, a pair of magnetic-field adjustment plates each on the surface of the permanent magnet to face the gap space and a pair of back yokes each on the back surface of the permanent magnet. According to the first aspect of the invention, a combination of a gradient coil and a shimming plate is mounted on the magnetic-field adjustment plate with intervention of several pieces of shim members and, further, another set of second shim members are bonded to the surface of the shimming plate facing the gap space with an object to improve the uniformity of the magnetic field in the gap space.

Abstract: A switch device including an inner yoke and an outer yoke are arranged around the winding of an electromagnetic block, and a plate-shaped permanent magnet is inserted between the two yokes. A highly efficient actuation of the switching device is achieved by the assistance of the permanent magnet.

Abstract: An improved magnetic decoupler with a magnetic field shape, strength and gradient optimized for releasing security tags, such as an antitheft device of the type described above. Due to the structure of the magnetic decoupler, it contains less ferrous material than prior art decouplers heretofore employed. Reduction in size of the magnetic decoupler, along with improved magnetic strength, derive from the magnet assembly including magnets arranged with orientations in quadrature to increase axial magnetic field gradient within the decoupler cavity by superposition of the magnetic fields of each magnet.

Abstract: A solenoid includes a ferrofluid in gaps between the moving and stationary elements which ferrofluid reduces noise caused by activating a plunger positioned within the solenoid. A permanent magnet can be included as a solenoid element to increase magnetic field strength within the solenoid to retain the ferrofluid within the solenoid. A cushion located between the plunger and a butt toward which it moves also reduces the noise, while the ferrofluid maintains a relatively high solenoid force relative to a solenoid with air gaps.

Abstract: A coil separator for a deflection yoke capable of simplifying its manufacturing process by assembling accessory components on divided neck portions and screen portions and then connecting the neck portions to the screen portions. The coil separator includes a screen portion having a band portion formed on its conical lower end, a neck portion including a wire guiding portion and a yoke clamp fastening portion, and a connecting portion for connecting the neck portion to the screen portion. The connecting portion may include a plurality of projected pins and insertion holes formed on the neck portion and the screen portion, respectively, so that the projected pins fit into the insertion holes to connect the neck portion to the screen portion. As an alternative, the connecting portion may include a spacer which has a predetermined height and is inserted between the neck portion and the screen portion to adjust the length of the screen portion.

Abstract: An electromagnetic drive for a switch, preferably a motor protective circuit-breaker. The electromagnetic drive has a magnetic system, whose movable armature serves to actuate switching contact elements in the switch. The armature is coupled to a transmission lever by a leaf spring. One end the leaf spring is fixedly clamped and the other end of the leaf spring is connected to the transmission lever in such a way that the transmission lever is actuated when the leaf spring flexes and thus the free end of the leaf spring is displaced.

Abstract: A permanent magnet rectangular bar shaped to form a helix having a central ore and a longitudinal axis. The magnetic orientation of the helical permanent magnet bar is along the longitudinal axis forming a transverse helical magnetic field. An electron beam or charged particle passing near the longitudinal axis experiences acceleration causing the charged particles to radiate creating a high energy radiation source. In another embodiment, first and second permanent magnet helical bars are intertwined together, forming a cylindrical tube, with each of the intertwined helical bars having a magnetic orientation along the longitudinal axis in opposing directions. In another embodiment of the present invention, an iron ribbon or other high permeability magnetic material is interposed between cut-out portions between first and second intertwined helical permanent magnet bars. This effectively augments the transverse magnetic field.