Abstract: An electromagnetic solenoid assembly is disclosed. The solenoid assembly includes a cup-shaped ring defining a pocket for an annular coil, and including a radially extending portion, a radially inner axially extending flange, and a radially outer axially extending flange. An axially outer end of the radially outer axially extending flange includes a first inclined surface and an axially outer end of the radially inner axially extending flange includes a second inclined surface. A ring-shaped armature includes a radially outer portion and a radially inner portion. An axially outer end of the radially outer portion includes a third inclined surface and an axially outer end of the radially inner portion includes a fourth inclined surface. Pairs of the inclined surfaces are aligned substantially parallel to each other. A distance between the ring-shaped armature and the cup-shaped ring is variable based on energizing the annular coil.

Abstract: The invention relates to a valve actuator (2), comprising a magnetic core (6) with an interspace (8) and at least one bifurcating branch (7), at least one variable magnetic field generating device (16), at least one permanent magnetic field generating device (13) and at least one movable magnetic component (12), wherein the bifurcating branch (7) defines a first region (4) and a second region (5) of said magnetic core (6).

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: 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 linear solenoid is provided which works to pull a plunger to a stator magnetically. The plunger and the stator are aligned to have ends opposed to each other. The end of the stator has formed therein a recess into which the end of the plunger is insertable. The recess has an inward magnetic attraction surface formed on a peripheral edge. The plunger has an outward magnetic attraction surface formed on an outer peripheral edge of the end thereof which faces the inward magnetic attraction surface through a magnetic gap. The inward and outward magnetic attraction surfaces have greater areas defining the magnetic gap, thereby ensuring a greater amount of magnetic attraction pulling the plunger to the stator upon energization of a coil. The recess may alternatively be formed in the end of the plunger.

Abstract: The invention includes an annular exciting coil 10, a main yoke 12 surrounding a periphery of the exciting coil and having polar teeth 12a and 12b disposed to face each other on opposite end sides of a central hole 11 of the exciting coil, and a cylindrical permanent magnet 13 disposed in the central hole of the exciting coil to be movable in an axial direction of the hole and polarized in a radial direction.

Abstract: The invention relates to a magnetic switch having a yoke which has the shape of a rotationally symmetrical cup on the base of which is arranged a permanent magnet. The flux of the permanent magnet is conducted via a core, which has a radial core flange, to the plate-shaped armature. For the operational air gap effective between the armature and the core and the yoke and the magnetic resistance WA thereof, the following relation applies in relation to the marginal air gap formed between the core flange and the yoke: WA<WR. As a result of the rotational symmetry with a yoke having the shape of a cup, it is possible to generate a high holding force for the armature with a small structural volume.

Abstract: A solenoid valve includes a moving part, a plunger of magnetic material having one end facing an end face of the moving part, and a protrusion formed at the one end of the plunger and abutting on the end face of the moving part. During energization, a magnetic path is formed from a valve body to the moving part to produce an attraction force between the valve body and the moving part across a clearance. Magnetic flux running along the magnetic path becomes saturated at the protrusion.

Abstract: A valve for dispensing a viscous fluid, includes a valve body defining a fluid chamber and a stepped armature within the fluid chamber. The armature has a large diameter portion maintained spaced apart from an inner surface of the valve body, defining a first air gap therebetween, and a second, smaller diameter portion which engages an inner surface of the valve body, supporting the armature within the valve body and defining a second lower reluctance air gap. A solenoid coil energized by a peak and hold drive current produces an electromagnetic field for moving the armature relative to the magnetic pole piece and the valve body. The second portion of the armature becomes magnetically saturated during the peak portion of the drive current, causing magnetic flux to be diverted through the first portion of the armature.

Abstract: An electromagnetic actuator for operating a setting member includes an electromagnet composed of a yoke body and a magnet coil held by the yoke body; an armature adapted to be coupled to the setting member; and a resetting spring for exerting a spring force to the armature. The spring force opposes the magnetic force generated by the electromagnet when energized. The armature is guided in a reciprocating motion which it executes in a direction of armature displacement in response to the magnetic and spring forces. The armature is provided with a plurality of throughgoing, slot-shaped apertures.

Abstract: A latching electromagnet is provided. The electromagnet (300) includes a core (305) having a pole face, a coil of windings (325), and an armature (330). Advantageously, the core has a geometry that locally increases the magnetic flux density to saturation levels.

Abstract: An expansion valve (10) for heat transfer systems such as an air conditioning system, includes a control element (20) for controlling the flow rate of working fluid through the valve. The control element has a stem member (28) and movable member (42) movable on the stem member. Openings (38) to an internal passage (30) in the stem member are regulated by positioning the movable member to achieve regulated flow rate of refrigerant material through the valve. The movable member of the control element is moved by a plunger (24) of a proportional solenoid (22). The proportional solenoid has a magnetic flux circuit including a low permeance isolation tube (62) surrounding the plunger, which enables removal of the coil (76) and frame (78) of the solenoid from the valve. The solenoid further includes a variable permeance flux washer (69) the flux through which varies with plunger position, which is disposed from a gap (82) which provides an area of magnetic saturation.

Abstract: A method of constructing a magnetic flux gap comprising fabricating a first portion from a material having low reluctance and so as to provide an end surface, and a cylindrical inner surface having a diameter, fabricating a second portion from a material having high reluctance and so as to provide axially spaced first and second end surfaces, and a cylindrical inner surface having a diameter greater than the diameter of said cylindrical inner surface of said first portion, fabricating a third portion from a material having low reluctance and so as to provide an end surface, and a cylindrical inner surface having a diameter substantially equal to the diameter of said cylindrical inner surface of said first portion, fixing together the first and second portions with the first end surface of the second portion in axially abutting adjacent relation to the end surface of the first portion and with said cylindrical inner surfaces in concentric relation, fixing together the second and third portions with the second

Abstract: A horizontal linearity correction coil is used for a television receiver having a cathode ray tube of a wide deflection angle and has excellent productivity, quality and loading respectively. The ferrite magnetic core has the flanges at both ends and the middle and has a hollow shape at one winding core portion of the ferrite magnetic core. The windings are wound around the winding core portions and the permanent magnets are combined to both end flanges.

Abstract: An apparatus for driving valve by electromagnetic force, for an engine capable of being installed in a narrower space due to the interfering object or narrow arrangement pitch of a supply/exhaust valve, comprises: a fixed magnetic pole which is wound with the primary coils and which is opposingly disposed embracing the secondary coils in the perpendicular direction to the reciprocating direction of the secondary coils; an air gap adjacent with a tip end of the fixed magnetic pole and provided in the middle of a magnetic flux path generated from the primary coil; a movable element adapted to be made of magnetic substance, to move freely reciprocating in the air gap, to form part of the magnetic flux path, and to contain the secondary coils.

Abstract: A magnetic yoke for an induction crucible furnace includes a rod-shaped core stack being suitable for carrying magnetic flux generated by a furnace coil of the induction crucible furnace. The core stack is enclosed on three principal surfaces thereof not facing the furnace coil by a flexurally and torsionally rigid support body having a C or U-shaped cross section. The support body is preferably formed of a material with good electrical conductivity and has longitudinal channels suitable for carrying a coolant. Preferably, an extruded profiled part formed of an aluminum alloy is used.

Abstract: A latching solenoid is provided which has first and second coils having a central axial opening arranged to produce oppositely polarized first and second magnetic fields along the axial opening. A paramagnetic path is provided from the central opening around the outside of the coils and back to the central opening, with this path having a first gap within the central opening. A plunger is spring biased within this central opening to close the first gap upon activation of the first coil in opposition to the spring.

Abstract: An electromagnetically-operated fuel injection valve has a magnetic circuit comprising a valve casing, a stator core on which an electromagnetic coil is wound, an armature core, and an air gap between the stator core and the armature core. At least one of the valve casing, the stator core and the armature core is so configuared that the magnetic flux passing therethrough is saturated substantially at the time the armature core is fully attracted to inject fuel. A magnetic restrictor at which the cross-sectional area for the magnetic flux is reduced than that at the other portion is provided at least at a portion of the valve casing, the stator core and the armature core so that the magnetic flux is saturated thereat substantially at the time the armature core is attracted fully.

Abstract: An actuating magnet is provided for a circuit interrupter. The magnet yoke is assembled from three solid segments of magnetic material to produce a U-shaped core. One or more coils are disposed on the core loop, and the center of the yoke is interrupted by a series of aligned holes.

Abstract: Real time servo control in a nonlinear, cyclical dynamic system adjusts the energy applied to a prime mover from a source of the energy as a linear function of an error between the measured load characteristics and modeled load characteristics. The modeled load characteristics are linearized as a function of the initial conditions of the load at the beginning of each cycle.

Abstract: An electromagnetic device having a ferromagnetic core having first and second legs and a third leg wherein opposed pole faces define a gap. A source of latching flux retains an armature in contact with one of either of the pole faces. A primary coil and a secondary coil are coupled in tandem to the first leg of the ferromagnetic core. The second leg is saturable under the cumulative flux created in the first leg when the secondary coil allows only a unidirectional flux flow in the first leg. The saturation of the second leg transfers a portion of the operating flux from the second leg to the gap operably moving the armature mounted therein.

Abstract: A solenoid includes a coil, a pole assembly, an armature movable in the pole assembly and an air gap separating the armature from part of the pole assembly. A single mumetal washer may be fixed to the armature adjacent the air gap or a pair of mumetal washers may be fixed to the armature and to one of the pole parts on opposite sides of the air gap.