Abstract: A method of sealing a formation that includes drilling a wellbore through the formation while pumping a non-aqueous based wellbore fluid comprising a first sealing component into the wellbore, wherein the non-aqueous based wellbore fluid filters into the formation as a filtrate and substantially thickens is disclosed. The substantially thickening may result from adding a second sealing component to the wellbore fluid, whereby the first sealing component initiates a reaction of the second sealing component.

Abstract: An actuating magnet is disclosed comprising an actuating means (2) for exerting a tensile or pressure force on a target element that is to be moved, switched, or latched or unlatched, and comprising a latching means for latching the actuating means (2) in a desired position, the latching means having a locking magnet (11) for locking and unlocking the actuating means (2).

Abstract: An auto-aligning and connecting structure used to connect and align an electronic device and an accessory, wherein a plurality of first magnetic bodies are disposed on a first surface of the electrical device and a plurality of second magnetic bodies are disposed on a second surface of the accessory. The magnetic pole of the first magnetic bodies and the second magnetic bodies are appropriately arranged so the first magnetic bodies and the second magnetic bodies can attract each other when the first surface and the second surface approach each other. Then, the electronic device and the accessories are connected to each other when the first surface and the second surface connect.

Abstract: The main body of the actuator structure is generally formed into a “pitchfork”shape. The middle bar of the pitchfork forms a Y-bend at its forward end. The Y-bend is disposed so that each tip of the bend is adjacent to the outer bar on each side of the pitchfork. At least a coil is fixed on each bar of the main body. The forward ends of the Y-bend abut against a movable member. In the structure above, applying a current to a coil generates minute movements in each tip of the Y-bend, thereby moving the movable member.

Abstract: A rotary solenoid for stabilizing performance is provided. A rotary solenoid 10 includes a pair of the first yoke 21 and the second yoke 22 placed oppositely in a rotor 24 providing a pair of magnetic poles by a permanent magnet, a core 23 enclosed by the first yoke 21 and the second yoke 22, and a coil 25 wound around the core 23 and forming a pair of magnetic poles in the first yoke 21 and the second yoke 22 by supplying electricity. These first yoke 21, second yoke 22, core 23, and coil 25 are resin-molded. A projecting portion 26a is provided in an outer surface on the opposite side of enclosing the core 23 by the first yoke 21 and the second yoke 22.

Abstract: An actuator includes a coil and an IC attached to a core. The coil produces a magnetic field and the core provides a path for the magnetic field. A rotor is rotatably mounted within the core, so that the rotor rotates in response to the magnetic field produced by the coil. The IC is electrically connected to the coil. The distance between the IC and the coil is determined based on a permissible temperature of the IC, so that the IC is not heated substantially in excess of the permissible temperature.

Abstract: An electromagnetic drive device includes a coil frame with a hollow tubular shape, a magnet rotor rotatably disposed in the coil frame through a rotational shaft, a transmission member for transmitting a rotation of the magnet rotor, and a coil wound around an outer periphery of the coil frame. The coil frame is formed of two coil frame halves divided vertically along the rotational shaft of the rotor, and the coil is wound in a direction crossing connection faces (joint faces) of the two coil frame halves on upper and lower end surfaces thereof.

Abstract: A structure and methodology of fabrication for a cost effective multipole motor adapted to high volume manufacture. The apparatus includes a low cost housing within which a stator assembly comprised of interchangeable stator electromagnets is installed. A rotor assembly including a plurality of sense magnets and motor magnets integrated onto a rotor shaft is also used. A cover assembly is attached to complete the device. The cover assembly includes a lead frame interconnection assembly and a magnetic sensor adapted to detect the passing of sense magnets to determine the position of the rotor shaft.

Abstract: The switching point in a high- or medium-voltage switch contains two fixed contact members (1, 2), a rotating, electrically conductive bridging contact member (3), and a drive for moving the bridging contact member (3). When the switching point is closed, the bridging contact member (3) is fit in between the fixed contact members (1, 2) and short-circuits them. The drive is composed of two coils (5, 6) which surround the bridging contact member (3) and are arranged in such a manner that the bridging contact member (3) can be caused to rotate by a current in a respective one of the coils. The energy which needs to be applied to rotate the bridging contact member is less than for contact members which move in translation in comparable switching points. The energy required for opening and closing the switching point is thus reduced.

Abstract: An electromagnetic actuator for efficiently moving an objective lens along a focusing direction and a tracking direction. The electromagnetic actuator includes a flux generator, a first set of coils, a second set of coils and a magnetic piece. A first magnetic part and a second magnetic part of the flux generator are placed within a gap for generating smooth magnetic lines of force. The first set of coils moves the objective lens along the focusing direction. The second set of coils provide micro rotation around a shaft to the objective lens, and magnetic pieces are placed in the magnetic circuit adjacent to the gap. The objective lens holder is held at the neutral position relating focusing and tracking directions while the magnetic attraction forces are acting on the magnetic pieces.

Abstract: An electromagnetic coil device, for example, used in a torque detector comprising a coil assembly including a bobbin and coils, a housing for covering the coil assembly, an electric circuit contained in the housing, and a plurality of bus-bars, each one end arranged in the coupler of the housing and the other end connected to the electric circuit for insertion molded to the housing, in which a bus-bar assembly comprises the plurality of bus-bars having caulking portions which can be caulked with the bobbin and a cover which partly covers the bus-bars and abutting against the outer periphery of the coil assembly, and the housing covers the coil assembly and the bus-bar assembly temporarily secured to the coil assembly by abutting the cover against the coil assembly and by caulking the caulking portions with the bobbin, connection terminals as a part of the bus-bars being bent by pressing against bending pedestals formed to the housing.

Abstract: A magnetofluidic suspension turbine combines a fluidic bearing and a magnetic circuit comprising a magnet in the stator and an airgap defined between polepieces of a ferromagnetic circuit between the rotor and the stator. This ferromagnetic circuit includes facing centering members on opposite sides of the airgap.

Abstract: A constant-torque single-phase electromagnetic actuator including a stationary device including a first magnetic stator circuit made of a high-permeability material and excited by at least one field coil (10), and a movable device (1) including an axially magnetized disc (3) having 2N pairs of magnetic poles magnetized in alternate directions, wherein the magnetization is substantially uniform. The magnetized disc (3) is attached to a second magnetic circuit (6) made of a high-permeability material, and the movable device is provided with a coupling shaft (7). The connection between the stationary device (1) and the movable device (2) allows at least some axial play of the coupling shaft (7) away from the stationary stator device (2), and the diameter of the magnetized disc (3) is substantially identical to that of the poles of the stator circuits. Play between the stationary (2) and Movable (1) devices is compensated by the magnetic attraction exerted by the stationary device on the movable one.

Abstract: A set of magnetically responsive vanes are secured for rotation about their mass center of gravity in a given angular spacing. The vanes have corresponding magnetic field producing coils which are in a different angular spacing such that one coil and vane is aligned and a second coil and vane are misaligned. An electrical switch is coupled to the vanes for operation in response to rotation of the vanes. A current applied to one coil aligns its vane thereto and closes the switch. The closed switch applies a load current to a second coil whose vane is misaligned. When an overcurrent occurs, the corresponding resulting field aligns its vane and opens the switch. An off current applied to a coil can align a corresponding vane to also open the switch. The switch and actuator are dynamically balanced so that moments produced by shock and vibration do not operate the actuator vanes or switch.

Abstract: A rotatable one-piece lens assembly that may be rotated relative to the instrument housing comprising a lens boss, integral with the lens, moving with the rotated lens to move the pointer to engage and test the switches. After the switch test the lens may then be rotated back to its normal position. In this manner the switches are tested without removing the lens from the instrument housing.

Abstract: A generally U-shaped brake magnet for a watt-hour meter molded from a thermosetting resinous material having powdered permanent magnet material embedded in the resinous material only adjacent the surfaces of the legs of the U which form the air gap into which the brake meter disc extends and which may further include reinforcing material embedded in the legs and the base of the U. These reinforcing materials can be non-magnetic metal particles having sharp edges or non-magnetic fibrous material.

Abstract: A movable magnet 1 turns in the air-gap formed by pole pieces 3', 4' of a stationary magnetic circuit 2. The magnetic circuit 2 is formed as one piece, and has a deformable connection portion 6, the magnetic properties of which are greatly inferior to those of the remainder of the circuit which enables the branches to move apart for introduction of the coil during assembly. This arrangement facilitates manufacture, while not limiting the diameter of the coil to the dimensions of the air-gap and maintaining a high degree of precision of the air-gap.

Abstract: An electromagnetic driving device for driving shutter blades wherein a field coil used as stator encircles a permanent magnet rotor and extends across the rotational axis thereof. The rotor is arranged to undergo reciprocating rotation through less than one half turn in driving the shutter blades to open and close the shutter. Interference between the field coil and a coaxially arranged output shaft is avoided by the provision of a U-shaped intermediate member extending about the field coil and connecting the output shaft and the rotor.

Abstract: An electromagnet for use in an extremely inverse time overcurrent relay, wherein extremely inverse relay performance is obtained as a result of the electromagnet's simplified design. The electromagnet comprises a core having two E shaped portions of unequal size, each portion including a base wall, two outer legs and an inner leg, with the inner legs of the two portions being arranged in aligned opposition. The opposed and aligned inner legs of the core constitute magnetic pole members having opposed faces spaced apart and defining an air gap therebetween. Each pole member is provided with a shading ring shading the pole member by greater than 50%. Further, the electromagnet is provided with a single energizing means located on the core for establishing a flux distribution in the air gap whereby a rotatable armature which may be located in the air gap may be driven in response to an energizing current.

Abstract: A restraining means of mildly magnetic material is adjustably implanted in the rotor disc of a conventional watthour meter. The restraining means interacts with a magnetic field generated by the meter's damping magnet to stop the disc from turning when the rate of energy consumption in the metered circuit is below a predetermined rate. The predetermined rate can be altered by varying the radial distance between the center of the disc and the restraining means and by varying the amount of magnetic material passing through the field of the damping magnet.