Abstract: An electromagnetic coil through which current is passed to generate a magnetic flux, a fixed core, a movable core, a magnetic spring disposed between the cores and, and a yoke are provided. The magnetic spring includes a magnetic substance, and biases the movable core in a direction in which the movable core is separated from the fixed core in a Z direction. Additionally, the magnetic spring includes a leaf spring member including the magnetic substance and spirally wound, and a central portion of the magnetic spring is located biased toward one side in the Z direction compared to a peripheral portion of the magnetic spring. When the movable core is attracted to the access position, the magnetic spring is prevented from being deformed to a minimum spring length corresponding to a width of the leaf spring member.

Abstract: An injection valve may include: a valve needle moving from a closed position to an open position; a calibration spring biasing the needle towards the closed position; an armature moving toward the pole piece to take the valve needle towards the open position with respect to the valve needle; and a pole piece. Some valves include a magnetic ring moving between a first position, with a top side spaced apart from the pole piece and an underside in contact with the valve needle, and a second position where the top side is in contact with the pole piece. A second spring is in parallel to the calibration spring. An upper retaining element connected to a shaft extends in radial direction to limit movement of the armature relative to the valve needle so that the armature connects to the upper retaining element to displace the valve needle towards the open position.

Abstract: The present disclosure relates to actuators. Various embodiments may include a laminated magnet armature for an electromagnetic actuating device, an injection valve for metering a fluid, and/or an electromagnetic actuating device having a laminated magnet armature. For example, a laminated magnet armature for an electromagnetic actuating device wherein the magnet armature is displaceable along an axis A in a movement direction may include a multiplicity of interconnected laminations oriented perpendicular to the axis A and stacked to form a lamination stack with a bottom side and a top side. Each lamination includes at least one recess open toward an edge of the lamination. The laminations are arranged within the lamination stack so the recesses form at least one duct extending through the lamination stack from the bottom side to the top side.

Abstract: An air temperature control system controls the air temperature inside of an air mattress. The air temperature control system includes an air intake component having inner and outer seals to inhibit or facilitate the flow of air into and out of the air mattress. The air temperature control system also includes a temperature control element in fluid communication with the air intake component. The temperature control element is positioned within the air mattress inside of the outer seal. The air temperature control system further includes a controller configured to direct the air intake component to open and close the inner and outer seals and operation of the temperature control element.

Abstract: An apparatus for use in a borehole may include a rotor having at least one set of magnetic elements and a cylindrical stator having a winding flowing current in a direction transverse to a long axis of the stator. The polarity of each magnetic element of the rotor may be arranged to alternate along a long axis of the rotor. The stator may be in sliding engagement with the rotor and have a core formed at least partially of laminations aligned along a plane co-planar with the long axis of the stator. Energizing the winding principally causes relative sliding between the rotor and the stator. A method for performing an operation in a borehole includes forming a well tool having at least one linear motor as described above, conveying the linear motor into the borehole, and operating a well tool by activating the linear motor.

Abstract: A method of non-rotatably securing a target to a shaft extending along a longitudinal axis within an enclosed proximity switch assembly is described. The target support at least one target magnet and a hub having a body portion extending along the longitudinal axis. The body portion includes an outer surface and a shaft aperture extending along the longitudinal axis, and further includes at least one threaded body aperture extending from the outer surface to the shaft aperture. The shaft is inserted into the shaft aperture, and a set screw is inserted into one of the body apertures. A torque is applied to the set screw to threadably engage the set screw with the one of the body apertures such that a distal end of the set screw contacts an outer surface of the shaft. The set screw is sealed within the body aperture with a high-temperature potting.

Abstract: Devices and methods for directing a magnetic field into a body party of a subject are provided. The devices include at least one electromagnetic coil, a magnetic core or yoke, and a pair of flux concentrators. The flux concentrators are separated by a gap into which the body part fits and through which the flux concentrators focus the magnetic field. The devices allow magnetic fields to be transmitted through the gap with higher intensity at greater distances from the device than possible with previous designs. The methods of using such devices allow the delivery of magnetic fields with higher intensity to the interior of a body part without exposing interposed proximal regions to magnetic fields of unduly high intensity. The devices and methods are useful for deep transcranial magnetic stimulation of the brain to treat various medical conditions.

Abstract: A thermal-magnetic trip unit is provided for a circuit breaker. The thermal-magnetic trip unit includes a heater and a translational magnetic system coupled to the heater. The heater includes a first portion, a second portion, and a third disposed between the first portion and the second portion. The first portion has a first surface disposed in a first plane, and the second portion has a second surface disposed in a second plane that is substantially parallel to the first plane. The first surface is separated by a first predetermined distance from the second surface. The third portion has a third surface disposed in a third plane that is substantially perpendicular to the first plane. The third surface has a first predetermined length and is separated by a second predetermined distance from the second surface. Numerous other aspects are provided.

Abstract: Disclosed is an electromagnetic device. The electromagnetic switching device includes: a shaft coupled with a movable contact point to reciprocate up and down; and an elastic member coupled with a bottom end of the shaft, wherein a vertical volume of the elastic member expands as a temperature is increased.

Abstract: A stepped portion is formed in an outer peripheral portion of a slide core and is stepped to reduce an outer diameter of one portion of the slide core located on one axial side of the stepped portion. A first conducting portion of a ring core covers an outer peripheral surface of the one portion of the slide core and is slidable along an outer peripheral surface of the one portion of the slide core. The first conducting portion conducts a magnetic flux between the first conducting portion and the slide core in a radial direction. A second conducting portion of the ring core is configured into a form of a flange and radially outwardly extends from the first conducting portion. The second conducting portion conducts the magnetic flux between the second conducting portion and a bottom wall portion of a yoke in an axial direction.

Abstract: An electromagnetic valve includes a valve seat, a valving element, and a solenoid part. The valve seat has an annular shape and defines a valve hole. The solenoid part includes a coil, a core guide part, a fixed core, and a movable core. The coil becomes an electromagnet upon energization thereof. The core guide part is arranged radially inward of the coil. The movable core is accommodated and reciprocated inside the core guide part in accordance with whether the electromagnet is turned on or off. The valving element moves integrally with the movable core to open or close the valve hole. The core guide part includes a magnetic unbalance part where magnetic force applied between the core guide part and the movable core is different between on one side and the other side of the core guide part in its radial direction.

Abstract: Magnetic cores are described that include a first magnetic material with a first magnetic permeability, forming at least part of a body of the magnetic core, and a second magnetic material that has a second magnetic permeability positioned in a corner region of the body of the magnetic core. The second magnetic material is disposed within the body such that a plurality of magnetic flux paths of different overall lengths traverses the corner region. The plurality of potential magnetic flux paths have a corresponding plurality of effective magnetic reluctances, with different paths of the plurality of magnetic flux paths having different associated first lengths of a first plurality of lengths and different associated second lengths of a second plurality of lengths such that the corresponding plurality of magnetic reluctances of the plurality of magnetic flux paths are substantially equivalent through the different overall lengths.

Abstract: A solenoid includes a plunger, a core, an electromagnetic coil, and a casing. A core receiving portion of the plunger is to receive a core projection while the electromagnetic coil is energized. A plunger receiving portion of the core is to receive a plunger projection while the electromagnetic coil is energized. The casing houses the plunger, the core, and the electromagnetic coil. At least one of an end portion of the plunger projection and an end portion of the core projection has an acute angle in a cross section along the axial direction. A distance between the end portion of the plunger projection and the end portion of the core projection is shortest among distances between the core and the plunger while the electromagnetic coil is not energized.

Abstract: A solenoid valve for controlling a fluid has a first housing part (2) and an axial guide (3) facing inwards for an armature (4) that can be displaced in the axial guide (3) under the effect of a solenoid (5) that at least partially surrounds the exterior of the first housing part (2). A return spring (6) and a closing element (27) impact a valve closing element (7). A second housing part (9) is arranged coaxially to the first housing part (2). The first housing part (2) has a reduced wall portion (17) that faces inwards towards the armature (4) and the second housing part (9) and that effects a magnetic separation of the two housing parts (2, 9) to at least some extent.

Abstract: An apparatus such as for a solenoid valve assembly includes a substantially annular flux collector (12) that has a first arced portion (10) and at least one additional arced portion (14). The first arced portion and the at least one additional arced portion are cooperatively configured to interlock with one another to form the substantially annular flux collector. A method (200) of manufacturing a solenoid valve assembly using the annular flux collector is also provided.

Abstract: An electromagnetic positioning device has a long stretched out anchor plunger section as well as an anchor having an anchor body section axially continuing the latter, which in order to magnetically interact with a core unit and by energizing a stationary provided coil device is movably designed relative to the latter. The core unit is designed in such a way that it at least sectionally encompasses the anchor plunger section as well as the anchor body section with an expanded diameter relative to the anchor plunger section. The core unit is a multi-part design in the axial direction with a stationary core section, an axially movable core section and a variable core gap between the stationary and movable core section, and the movable core section and anchor are designed and joined together via a driver in such a way that, in response to energization, the movable core section moves, causing the core gap to close, and the driver drives the anchor in the axial direction.

Abstract: A pole tube including a non-magnetic spacer ring configured to join a pole piece along a control cone and also configured to join a tube piece along a back annular surface. The annular surface includes a first face section and a second face section. The first face section and the second face section are disposed at an angle with respect to each other.

Abstract: A solenoid valve includes a magnet armature, which is operatively connected to a sealing element of the solenoid valve in order to move the latter, and an armature opposing piece which is arranged at the end of the magnet armature. An intermediate element, which can be placed in supporting contact with the armature opposing piece, is mounted in an axially movable fashion in a guide recess in the magnet armature. A driver assistant device includes the above-described solenoid valve.

Abstract: An electromagnetic actuator comprising a core moving between a latched position and an open position, a permanent magnet, a coil designed to generate a first magnetic control flux to move the core from an open position to a latched position, and a second magnetic control flux designed to facilitate movement of the moving core from the latched position to the open position. The permanent magnet is positioned on the moving core so as to be at least partly outside the fixed magnetic circuit in which the first magnetic control flux flows in the open position, and to be at least partly inside the fixed magnetic circuit used for flow of a magnetic polarization flux of the magnet in the latched position.

Abstract: A solenoid (30) is provided. The solenoid (30) includes a magnetic core (304). The solenoid (30) also includes a pole piece (305) positioned substantially coaxially with the magnetic core (304). An over-molded component (303) is provided that is over-molded around at least a portion of the magnetic core (304) and at least a portion of the pole piece (305).

Abstract: A stepped portion is formed in an outer peripheral portion of a slide core and is stepped to reduce an outer diameter of one portion of the slide core located on one axial side of the stepped portion. A first conducting portion of a ring core covers an outer peripheral surface of the one portion of the slide core and is slidable along an outer peripheral surface of the one portion of the slide core. The first conducting portion conducts a magnetic flux between the first conducting portion and the slide core in a radial direction. A second conducting portion of the ring core is configured into a form of a flange and radially outwardly extends from the first conducting portion. The second conducting portion conducts the magnetic flux between the second conducting portion and a bottom wall portion of a yoke in an axial direction.

Abstract: In one of its aspects the technology disclosed herein concerns a process of making a rotary solenoid. In a generic mode, the process comprises fitting together two mating core half members (22A, 22B) of a stator until two respective pole faces (32A, 32B) of the two mating core half members (22A, 22B) press to a positive stop against a precision diameter pin positioned between the two mating core half members and so that the two mating core half members interlock at the positive stop. The process further comprises removing the precision diameter pin to provide an axially extending space comprising a predetermined distance between the two respective pole faces (32A, 32B). The process further comprises inserting a rotor (26) within the axially extending space. The process further comprises fitting the two mating core half members (22A, 22B) and the rotor (26) between the two opposing end caps (20, 30).

Abstract: The invention relates to a hydraulic transmission valve with a magnetizable housing which is integrally configured in one piece with a pole core cone. The transmission valve according to the invention facilitates comfortably coupling in particular startup clutches, shifting clutches or synchronization clutches in a friction locking manner. Still using a transmission valve of this type is facilitated for fewer to no transmission oil changes. Furthermore a transmission valve of this type can also be used in countries with inferior transmission oil quality. The housing includes a connection. The connection defines an anchor stroke and a concentric arrangement between the pole core cone and a pole tube. Thus, the pole tube is fixated the magnetizable pole flange. An anchor that is exclusively supported in the pole tube is magnetically separated from the pole tube through a separation layer with a thickness of 0.01 mm to 0.06 mm.

Abstract: A solenoid arrangement comprises a pole tube which is axially subdivided into a pole core section, a transition section, and a tube section. A magnetic flux between the pole core section and the tube section is interrupted by the transition section. An armature is movably guided in the pole tube and has, at its end facing the pole core section, a flange which axially projects from an end face. According to the invention, the pole core section has a stepped depression into which the armature can plunge and which, starting from the transition section, is subdivided into an annular collar, a shoulder, and a notch which is set back axially and radially. An axial dimension of the collar exceeds an axial dimension of the flange.

Abstract: A magnetic core including (i) a first magnetic material having a first magnetic permeability to substantially provide a core body of the magnetic core, and (ii) a second magnetic material having a substantially triangular structure positioned in a corner region of the core body. The corner region is defined by a region of the core body where a first portion of the core body coincides with a second portion of the core body in a manner that is substantially perpendicular. The second magnetic material is used to substantially evenly distribute magnetic flux in the magnetic core, and the second magnetic material has a second magnetic permeability that is lower than the first magnetic permeability.

Abstract: An electromagnetic valve includes a valve seat, a valving element, and a solenoid part. The valve seat has an annular shape and defines a valve hole. The solenoid part includes a coil, a core guide part, a fixed core, and a movable core. The coil becomes an electromagnet upon energization thereof. The core guide part is arranged radially inward of the coil. The movable core is accommodated and reciprocated inside the core guide part in accordance with whether the electromagnet is turned on or off. The valving element moves integrally with the movable core to open or close the valve hole. The core guide part includes a magnetic unbalance part where magnetic force applied between the core guide part and the movable core is different between on one side and the other side of the core guide part in its radial direction.

Abstract: An actuating device, particularly for actuating valves that can be connected externally, includes a housing (10) and a coiled body (12) in the housing and having a coil winding (14). The winding encloses a pole tube (16) at least partially, having a pole core (20) connected at its free end. An armature (22) is guided in a longitudinally displaceable manner at least in the pole tube (16) within an armature chamber (24) and interacts with an actuating device (26) for actuating a valve part. The actuating part (26) is guided within the pole core (20) along an annular body (92), sealing the inside of the pole core (20) and the pole tube (16) relative to the surrounding area.

Abstract: An actuating device, particularly for actuating valves connected externally, includes a housing (10) and a coil body (12) arranged in the housing. The coil body has a coil winding (14) at least partially enclosing a coil tube (16), a pole core (20) connected at the coil tube free end, an armature (22) guided in a longitudinally displaceable manner at least in the pole tube (16) within an armature chamber (24) and interacting with an actuating part (26) for actuating the respective valve part. The pole tube (16) is designed as a receiving sleeve for the armature (22). The sleeve is fixed with its free end region to a fixed bearing point. The fixed bearing point is formed by two support parts (118, 124) of the pole core (20) that delimit a receiving gap between them, in which the free end region of the receiving sleeve is fixed in a clamped manner.

Abstract: Electromagnetic devices and near field plates for three-dimensional magnetic field manipulation are disclosed. In one embodiment, an electromagnetic device includes a rotor, a stator, and a magnetic field focusing device. The rotor may include a rotor body and a plurality of radially extending rotor poles. The stator may include a plurality of stator poles radially extending inwardly from a stator body toward the rotor body. Each stator pole may have a magnetic flux generating device and a stator pole tip, wherein an air gap may be located between each stator pole tip and each corresponding rotor pole. The magnetic field focusing device is coupled to at least one stator pole tip and produces a magnetic field profile having at least one concentrated magnetic flux region proximate the stator pole tip. The magnetic field focusing device twists the magnetic field profile by an angle ?.

Abstract: A switched reluctance motor includes a stator and a rotor, the stator having stator poles supporting a magnetic field focusing device such as a near field plates on each stator pole tip. An example near field plate has a spatially modulated surface reactance configured so as to focus magnetic flux extending from each pole tip within at least one region of increased magnetic field proximate the pole tip.

Abstract: A solenoid for an electromagnetic valve, which reduces a magnetic resistance resulting from a space between a movable iron core and a magnetic plate. A magnetic plate provided around a movable iron core forming a magnetic path between a magnetic frame and the movable iron core includes an extending portion extending toward a stationary iron core along a surface of the movable iron core. An area Sa of an opposing portion of an outer periphery of the movable iron core opposing an inner peripheral surface of the magnetic plate and a sectional area Sb of the movable iron core satisfy K=Sa/Sb, K>1. An axial length h of the inner peripheral surface of the magnetic plate and a length L from an attracting-force acting surface of the movable iron core located at a position separate from the stationary iron core to a front end portion of the magnetic plate satisfy 2?K?[value of K when h=L].

Abstract: In one aspect, a fuel injector includes an injector body that defines a fuel inlet, a drain outlet and a nozzle outlet. A direct operated check valve is positioned in the injector body and includes a needle valve member with an opening hydraulic surface exposed to fluid pressure in a nozzle supply passage, and a closing hydraulic surface exposed to fluid pressure in a needle control chamber. The needle valve member is movable between a first position at which the nozzle supply passage is blocked to the nozzle outlet, and a second position at which the nozzle supply passage is open to the nozzle outlet. A needle control valve is positioned in the injector body and includes a control valve member movable between a first position at which the needle control chamber is fluidly connected to the drain outlet, and a second position at which the needle control chamber is fluidly blocked to the drain outlet.

Abstract: According to one embodiment, a coil terminal is electrically connected to a coil being wound around an electromagnetic block and connected to a coated wire. The coil terminal includes a connection portion electrically connected to the coil, and a terminal body portion extending from the connection portion and connected to the coated wire. The terminal body portion includes a slit formed in the longitudinal direction of the coated wire from one end to the other end of the terminal body portion, a base portion formed on the other end of the coil terminal, and a pair of parallel beam portions extending toward one end of the coil terminal from the base portion with the slit interposed between the pair of beam portions. The pair of beam portions may protrude in a thickness direction of the terminal body portion. The coated wire may be disposed within the slit and a core wire at the tip end of the coated wire may be soldered to the base portion.

Abstract: An electromagnetic actuator device has a core unit with a coil device designed to cooperate with armature units displaceably guided relative to the core unit in response to current applied to the coil device, wherein the core unit is designed to cooperate with a plurality of spatially separated plunger units of the armatures so that an electromagnetic interaction takes place with the plurality of plunger units in response to current applied to a coil of the coil device.

Abstract: An exemplary electromagnetic coupling device includes an electromagnet and a vane member that is selectively magnetically coupled with the electromagnet. A non-magnetic slider layer is supported on one of the electromagnet or the vane member such that the slider layer is between the electromagnet and the vane member. The slider layer maintains a spacing between the electromagnet and the vane member. In a disclosed example, the electromagnetic coupling device is used for coupling an elevator car door to a hoistway door for moving the doors in unison between open and closed positions.

Abstract: A laminate stack having individual soft magnetic sheets. The individual sheets are involutely curved in the laminate stack. Each individual sheet has a first long side, a second long side opposite the first long side, a first short side and a second short side opposite the first short side. The first long side has a recess, said recess being rectangular and equidistant from the first short side, the second short side and the second long side when the individual sheet is in its uncurved state.

Abstract: An electromagnet, in particular a switching magnet, has a field winding (11) located on a coil former (7), and has a pole piece (23) forming a part of the magnetic return path. A pole core (17) and an axially movable magnetic piston (19) are provided within the coil former (7). The pole piece (23) forms an aperture opening (25) for the magnet piston (19) on the area opposite the pole core (17). The magnet piston (19) is borne for its movement in its guide in the pole core (17). The pole piece (23) has a flange part (27) at least partially engaged over the coil former (7) at its axial end, and has a bush part (29) which extends axially from it. Within the coil former (7), the pole piece forms a hollow cylinder engaged over a longitudinal section of the magnet piston (19). Between the inner wall of the hollow cylinder and the circumference of the magnet piston (19), a parasitic air gap (30) is formed.

Abstract: An electromagnetic brake contains a coil seat including plural receiving holes disposed on a front end thereof to receive plural compression springs respectively and an electromagnetic coil mounted on the front end thereof; a movable friction piece fitted on the front end thereof; a brake member fixed in a front end of the friction piece and including a transmitting shaft fitted thereon; a fixed member secured on a front end of the brake member, wherein the electromagnetic coil includes a first silicon steel ring, a plurality of slots and a number of elongate grooves, and each slot includes an isolation holder fitted therein, and the isolation holder includes a recess formed on one side thereof to correspond to the groove of the first silicon steel ring, and between two abutting isolation holders is provided with a coil set formed by an enameled copper wire.

Abstract: A vertical rotor type gas solenoid valve comprises a valve case (14), a regulating spring (11), a regulating nail (10), a rotor regulating screw (9), a regulating screw bracket (12), a swing arm (18), a sealing gasket component arranged at an outer end of the swing arm (18), and a vertical rotor type electromagnet. The valve case (14) comprises a gas net (15), a gas outlet (16) and a valve port (17). The gas flow and the curve of the gas flow against the electric current of the winding can be regulated, and the minimum starting point of gas flow is determined.

Abstract: A servovalve torque motor includes first and second pole pieces and an armature. Each of the first and second pole pieces includes an armature face that opposes the armature. The area of the armature face of the second pole piece is smaller than the area of the armature face of the first pole piece. The unequal areas of the first and second armature faces create a bias in the servovalve torque motor while allowing the first and second pole pieces to be disposed at equal distances from the armature to define substantially equal air gaps. The inclusion of substantially equal air gaps between the pole pieces and the armature reduces the maximum flux in the armature for the same bias and torque output, compared to conventional servovalve torque motors. The reduction in maximum armature flux decreases armature saturation and improves linearity during operation.

Abstract: The electromagnetic actuator is a linear electromagnetic actuator in which the relative position between a slide table that supports permanent magnets thereon and a guide rail that supports a coil, which is arranged in confronting relation to the permanent magnets, is displaced by means of a thrust force generated by a current flowing through the coil. The coil is disposed on the guide rail through a low coercive force magnetizable material body, the coercive force of which is lower than a predetermined value. Consequently, generation of residual magnetization can be suppressed, and an influence on the thrust force caused by such residual magnetization can also be suppressed.

Abstract: An electromagnet may comprise a pole piece (20) and coil assembly (30). The pole piece (20) may be magnetically susceptible and have a channel structure and a first flange member (22). The channel structure may have an annular inner side wall (24), an annular outer side wall (26) and an annular end wall (28) that fixedly couples the inner and outer side walls (24, 26) to one another on a first axial end (27) of the pole piece (20). The channel structure may be open on a second axial end (29) of the pole piece (20) that is opposite the first axial end (27). The first flange member (22) may be coupled to an end of one of the inner and outer side walls (24, 26) on the second axial end (29) and extend in a radial direction of the pole piece (20) towards an interior of the channel structure. The coil assembly (30) may be fixedly coupled to the channel structure between the inner and outer side walls (24, 26).

Abstract: An electromagnetic valve includes a coil that generates a magnetic force, a stator core arranged radially inward of the coil, an armature moved toward the stator core in an axial direction of the coil by the magnetic force, a yoke arranged on radially outward of the coil, a housing axially contacting the yoke and including a slide hole supporting the armature slidably, and a ring-shaped magnetic plate. The ring-shaped magnetic plate faces to the armature on a radially inner side of the magnetic plate, and faces to the yoke via a clearance on a radially outer side of the magnetic plate. The magnetic plate radially contacts the housing on the one side in the axial direction with reference to a position where the yoke contacts the housing, and on a radially outer side of an inner surface of the slide hole.

Abstract: The invention relates to a solenoid wherein a magnetic discontinuity is formed in the pole tube reducing the effective material thickness, such as by reducing the thickness, particularly the wall thickness of the magnetically active material, the front face of the armature facing the pole core and a bottom face in the interior of the pole tube at the pole core each have a contour allowing mutual axial overlapping. This enables advantageous influencing of the force-stroke characteristic curve of the solenoid with low production effort.

Abstract: An electromagnetic hydraulic valve, having a solenoid (1) with a coil carrier (3), which receives at least one coil (4) in a completely encapsulated manner in an injection-molded encapsulation (7) and carries at least one terminal, wherein the terminal is formed of individual segments (10, 11) which are inserted into radially extending through openings (8, 9) that are formed in the coil carrier (3) and in the insert molding (7) adjacent to the at least one coil (4).

Abstract: An electromagnetic solenoid includes first and second stators arranged at two axial end sides of a coil. The first stator includes an annular radial core part, an axial core part cylindrically extending from an inner end of the radial core part toward the second stator, and a core corner part having an outer corner surface at an intersection of the radial and axial core parts. A plunger guide includes a cylindrical sleeve inward of the stators, a flange extending radially outward from the sleeve along a side of the radial core part opposed to the coil, and a plunger-guide corner part having an inner corner surface at an intersection of the sleeve and the flange. The outer and inner corner surfaces of the core corner part and the plunger-guide corner part abut on each other in a contact portion linearly or in area along an entire circumference.

Abstract: The magnetic force between the electromagnet and plunger of a magnetic actuator, the electromagnet including a coil generating magnetic flux when the coil is energized, can be increased by locating a near field plate on the electromagnet. The near field plate has a spatially modulated surface reactance configured to focus the magnetic flux within a region of the plunger, such as the central portion of an end portion of the plunger proximate the electromagnet, so as to increase the magnetic force between the electromagnet and plunger. Examples also include permanent magnet based actuators and the use of other magnetic field focusing devices.

Abstract: A solenoid actuator includes a stator assembly with a stator core of formed powder metal received in a stator housing. A ferromagnetic protective sleeve is in contact with and covers a majority of an inner end face and a cylindrical wall of the stator core, while a flux ring is in contact with and covers an outer end face of the stator core. An armature assembly includes an armature attached to a stem that is movable in an air gap relative to the ferromagnetic protective sleeve. A spring is operably positioned in the ferromagnetic protective sleeve but electrically isolated from the stator housing. The stator core is encapsulated to protect against erosion and fragmentation. A magnetic flux line around a solenoid coil passes through the stator core, the ferromagnetic protective sleeve, the armature, the flux ring and back to the stator core.

Abstract: A solenoid actuator includes a stator assembly with a stator core of formed powder metal received in a stator housing. A ferromagnetic protective sleeve is in contact with and covers a majority of an inner end face and a cylindrical wall of the stator core, while a flux ring is in contact with and covers an outer end face of the stator core. An armature assembly includes an armature attached to a stem that is movable in an air gap relative to the ferromagnetic protective sleeve. A spring is operably positioned in the ferromagnetic protective sleeve but electrically isolated from the stator housing. The stator core is encapsulated to protect against erosion and fragmentation. A magnetic flux line around a solenoid coil passes through the stator core, the ferromagnetic protective sleeve, the armature, the flux ring and back to the stator core.

Abstract: Embodiments of soft latching solenoids comprise a coil assembly (24); a plunger assembly (26); at least one flux conductor (28) comprising a flux circuit. The coil assembly (24) is fixedly situated with respect to a solenoid frame (21). The plunger assembly (26) is configured to linearly translate in a first direction along a plunger axis (32) upon application of a pulse of power to the coil assembly (24). The flux conductor(s) (28) is/are positioned radially exteriorly to the plunger assembly (26) to form the flux circuit. The flux circuit comprises the solenoid frame (21), the plunger assembly (26), and the at least one flux conductor (28). The flux circuit is arranged and configured so that the plunger assembly (26) is held in a plunger detent position upon cessation of the pulse of power.