Abstract: An electromagnetic actuator comprises a core (1), a ferromagnetic component (2) movable in a gap (5) in the core, and a magnet (4) for attracting the component to one side of the gap. A flux concentrator (12) concentrates the magnetic flux on that side of the gap (5) and a solenoid (8) produces magnetic flux in the gap. A magnetic circuit of the solenoid is defined by part of the core (1), part of the gap (5) and by a further gap (6) between the ferromagnetic component (2) and the core (1). A demagnetiser (7) has a magnetic circuit defined by another part of the core (1), another part of the gap (5) and by the further gap (6). The demagnetiser is arranged to demagnetise the magnet (4) at least to the extent that the magnetic flux produced by the solenoid (8) is diverted from the flux concentrator (12) into the further gap (6) and the movable component (2) is movable away from the magnet (4) under the magnetic force of the solenoid (8).

Abstract: In one embodiment of the present invention, an electromagnetic drive unit including a coil, a yoke, and an armature is disclosed. The winding of the coil is partly wound in one direction and partly in the other direction. An electromechanical switching device includes at least one input terminal and a respective output terminal and an electromagnetic drive unit adapted to limit or to break the electrical current between the at least one input terminal and the respective output terminal.

Abstract: A magnetic latching actuator operable to control the movement of at least a first contact and second contact between a closed position in which the contacts physically engage each other and an open position in which the contacts are spaced from each other. The magnetic latching actuator includes first and second stationary permanent magnets oriented such that the first magnetic field created by the first magnet and the second magnetic field created by the second magnet are in opposite directions. An actuation coil surrounds both the first and second magnets. Current is supplied to the actuation coil in a first direction to create a first magnetic field or a second direction to create a second actuation magnetic field opposite the first actuation magnetic field. A yoke is movable relative to the first and second magnets to cause the first and second contacts to move between the open and closed positions.

Abstract: The present invention provides the actuator, which is capable of preventing biased abrasion by lowering a surface pressure at a contact portion of a movable element with a guide surface and increasing a movable range, in which a specified output force can be gained. Magnetic resistance of at least one of the surfaces (Y1, Y2) of first and second yoke parts (5, 6) corresponding to peripheral surfaces (P1, P2) of a plunger (7), on which magnetic flux acting surfaces are formed by energization, is unbalanced in the circumferential direction so as to act a resultant force of magnetic forces acting on the movable element in the radial direction eccentrically to a radial one end (E1) side.

Abstract: A highly efficient electromagnetic actuator which can reduce leakage of the magnetic flux is provided. The electromagnetic actuator comprises a first coil 31, a movable body 2 adapted to move on the central axis of the first coil 31, a first stator 11 covering the top face, bottom face and outer peripheral face of the first coil 31, and a permanent magnet 15 adapted to firmly latch the movable body 2 at one end point of its movable range. A second stator 12 adapted to control the magnetic flux generated from the permanent magnet 15 is provided in succession with the first stator 11. By providing the second stator 12, when releasing the movable body 2 from its firmly latched state, the permanent magnet 15 is not inversely excited or demagnetized.

Abstract: The present invention is directed to an inductively driven electromagnetic linear actuator arrangement employing eddy currents induced by a fixed drive coil to drive its armature. Eddy current focusing fields are employed to direct the eddy currents using Lorentz forces to maximize armature speed. The armature includes a shorted driven coil in a DC magnetic field. This can be supplied by a permanent magnet. When current is applied, a force is felt by the coil in a direction perpendicular to the magnetic field. Such an actuator is well suited for electrical switching applications including transfer switching applications, circuit breaker applications, and ground fault interrupter applications.

Abstract: There is disclosed an electromagnetic relay comprising a stationary first member and a second member adapted to move towards and away from the first member such that when the second member move towards the first member an electrical contact is closed. Spring means biases the members apart, and permanent magnet means are provided for generating a force of attraction between the members, and selectively operable means is provided for generating an electromagnetic force. The permanent magnet means has a strength such that when the first and second members are apart the permanent magnet means is insufficient to overcome the spring means, but when the members are brought together the permanent magnet means is able to hold the members together against the spring means.

Abstract: A bistable contactor comprises at least two concentrically arranged coils, an armature that is movable relative to the coils, a permanent magnet that is stationary relative to the coils, and a spring element. The armature includes contacts for opening and closing a circuit. The coils move the armature and contacts between a first stable position and a second stable position. In the first stable position, the armature is held in position by the permanent magnet, and in the second stable position, the armature is biased into position by the spring element.

Abstract: An electrically operated fluid dispenser for dispensing a pattern of viscous fluid onto a substrate during a run mode. The dispenser is turned off and does not dispense the viscous fluid during a standby mode of operation. The dispenser includes a dispenser body having an outlet and an armature disposed in the dispenser body for movement between an opened position allowing a fluid flow from the outlet and a closed position preventing the fluid flow from the outlet. A coil is mounted adjacent the armature and selectively generates an electromagnetic field for moving the armature between the opened and closed positions. A controller includes different apparatus and methods for using the coil as a heater as well as providing other heat transfer devices on the dispensing valve to maintain a constant temperature either, during only the run mode or, during both, the run and the standby modes.

Abstract: The present invention includes a first switch 4a, a second switch 4b and a capacitor 4d. The first switch 4a normally in a closed state is connected in series between a power source 1 and load, and opens when an accident builds up. The second switch 4b normally in an open state closes almost simultaneously with the opening of the first switch 4a. The capacity 4d normally charged by an arbitrary voltage has predetermined electrically capacity. The serial connected circuit consists of the second switch 4b and capacitor 4d, it is connected in parallel to the first switch 4a.

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: 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: A circuit breaker includes a coil arrangement for actuating an armature to open the breaker. To prevent false tripping during high transient currents drawn by a load, the coil arrangement has first and second coils, electrically connected in series. The second coil is interposed between the first coil and the armature and is wound in an opposite direction from the first coil to produce an opposing field.

Abstract: A vacuum circuit breaker comprising an external coil which is arranged outside a vacuum interrupter, and a power supply circuit which causes current to flow through the external coil. An overcurrent flowing through the main circuit of the circuit breaker, which leads to a load, is detected by an overcurrent tripping device so as to separate the movable electrode of the vacuum interrupter from the fixed electrode thereof and to subject a striking electric arc to a magnetic flux generated axially of the vacuum interrupter by the electrodes themselves. Thereafter, a trigger gap is ignited by a signal delivered from the overcurrent tripping device, so as to introduce a reverse current into the vacuum interrupter. Herein, the trigger gap is ignited by a signal delivered from the overcurrent tripping device, in order that the zero point of currents may be formed at the point of time at which the axial magnetic flux has been canceled by the resulting current of the external coil.

Abstract: A portable power operated surface cleaning device comprising a handle assembly, a hollow generally cylindrical roller supported for rotation on and relative to the handle assembly, and an absorbent generally cylindrical applicator sleeve coaxially supported on said roller for rotation therewith. The roller is driven by an electrical motor contained within it and powered by a rechargeable battery also supported within the roller. Operation of the motor is controlled by a rotary electrical switch which includes a pair of magnetically responsive electrical switch contacts contained within the roller and a magnetic switch actuator mounted on the handle assembly.

Abstract: A combined trip actuator and accessory module for molded case circuit breakers is accessible in the field for user selected accessory options. The trip actuator includes a U-shaped stator with a permanent magnet at the end of one leg. A spring-loaded armature member extends across both legs to form a closed-loop magnetic circuit. The over-current trip coil and shunt trip coil are arranged on one leg with the undervoltage coil arranged on the other leg. The accessory module is accessible from the top surface of the breaker cover for field installation of the undervoltage and shunt trip coils to provide the corresponding undervoltage and shunt trip functions.

Abstract: A circuit protector for protecting a circuit from an overcurrent including a U-shaped main yoke, a main permanent magnet arranged between legs of the U-shaped yoke, a main coil wound around the main yoke, a movable member made of magnetic material and arranged at an open end of the U-shaped yoke, a magnetic device for generating a magnetic force for moving the movable member in a direction away from the yoke, a movable contact secured to the movable member and a fixed contact provided in opposition to the movable. The coil and the movable and fixed contacts are connected in series with a circuit to be protected across a D.C. power supply source. When an overcurrent flows through the coil, the coil generates a magnetic flux having an opposite direction to that of a magnetic flux induced by the permanent magnet, so that a magnetic force for attracting the movable member to the yoke is decreased.

Abstract: A magnetic snap latch having a coil (4) wound on a preformed insulating bobbin (3) having anti-rotation projections (3a) that locate and fix the coil within a high permeability magnetic shell (2). A high permeability magnetic plunger (1) extends through a hole (2a) in the shell into the coil (4) and has rigidly secured thereto a low permeability magnetic disk (6) within the shell. A high permeability backplate (5) closes the open end of the shell and defines an air gap (AG2) in which is located a non-magnetic return spring (7). When the coil is energized, the disk (6) is initially attracted to the shell (2) to move the plunger (1) a small distance to the right but the disk (6) then saturates and the increasing magnetic force in the air gap (AG2) snaps the plunger (1) to the left, whereafter the return spring (7) restores the plunger (1) when the coil (4) is deenergized.

Abstract: An electromagnetic switching device includes a magnetic circuit having at least two open side legs, each carrying a control winding, said magnetic circuit being made of such a shape that when a signal is applied to one of the control windings, magnetic fluxes are produced in the open side legs, their direction being reversed when a signal is applied to the other control winding. Said electromagnetic switching device also includes at least one magnetically responsive contact featuring at least three contact members or at least two magnetically responsive contacts each featuring at least two contact members, each of the open side legs with a control winding being mounted thereon one contact member of at least one of the magnetically responsive contacts.

Abstract: A remarkably compact reed-switch relay having a U-shaped core comprised of two separate areas of remanent magnetic material and controlled by a first coil encircling the bight of the core and by a second coil encircling both legs of the core. Reed switches are positioned within the second coil and in proximity to the legs of the core, the switches being disposed with their magnetic axes substantially parallel to the core legs so that energization of the first coil causes orientation of the remanent core flux in a manner opening the switches and latching them open, while energization of the second coil closes the switches and orients the remanent core flux to latch them closed.