Abstract: Friction and/or wear resistance of relatively moving component parts in various devices, such as electric position sensors and solenoids, is improved by cryogenic treatment of lamina on component parts. Such treatment of coil, stator, armature, and/or housing of a solenoid also improves solenoid efficiency.

Abstract: The invention relates to an actuator for actuating a valve installed in a hydraulic or compressed air system, comprising a coil support which can be displaced by means of air space induction in a magnetically conducting housing on a magnetic cylinder composed of a permanent magnet and a cylinder pole disk. The invention is characterised in that the dimensions of the permanent magnet (16) and the pole disk (17) correspond to each other in such a way that the diameter of the front surface of the permanent magnet (16) is at least the same size as the circumferential surface of a neighbouring pole disk (17) and that the width of the coil (23) associated with the pole disk (17) exceeds the width of the pole disk (17) by the lift amplitude of the coil support (19).

Abstract: The present invention relates to a closure device, in particular for closing ducts in a valve-accommodating member in which pressure medium is conveyed, comprising a rotationally symmetric closure member [(3)] that is wedged in an accommodating bore [(2)] of a housing [(11)]. The calked joint is configured as a calking cone [(1)] so that the accommodating bore [(2)] forms a funnel-shaped contraction in the direction of the closure member [(3)], said contraction covering the periphery of the closure member [(3)] in the area of a collar [(4)], and succeeding the calking cone [(1)] is a second housing step [(6)] that is expanded in relation to the first housing step [(5)], said step [(6)] being formed by the housing material deforming plastically to the funnel-shaped contraction of the accommodating bore [(2)].

Abstract: An apparatus of the present invention comprises a coupling unit that provides the coupling between a valve element of an opening-closing valve and a moving element of an electromagnetic actuator so as to enable mutual movement of the two elements relative to each other within a predetermined restricted range. Accordingly, it is possible to provide an opening-closing valve driving apparatus that can reduce power consumption of the electromagnetic actuator and is excellent in responsivity.

Abstract: A quick-return electro-mechanical actuator (20) broadly includes a cocking solenoid (21) and a holding solenoid (22). Each of the solenoids has an armature (24, 31) and a rod (26, 33). The rods are adapted to contact one another when the actuator is energized. However, after the second rod has been moved to its extended position, the cocking coil is de-energized.

Abstract: An electromagnetic actuator includes a stationary member, a movable member magnetically coupled with the stationary member with a gap therebetween, and a support member for displaceably supporting the movable member relative to the stationary member. Both the stationary member and the movable member have a core section carrying a coil wound around its periphery. As the coil of the stationary member and that of the movable member are energized with electric current, the movable member is either attracted toward or repulsed from the stationary member. The electromagnetic actuator can be used for an optical scanner by providing a mirror and a lens on the movable member.

Abstract: An improved solenoid for providing linear actuation. The outer polepiece of the solenoid is provided with an axial journal bearing for supporting an actuating shaft extending from the solenoid armature. Radial tolerance between the bearing inner bore and the shaft is as small as in practically possible, which feature permits elimination of the prior art portion of the guiding sleeve extending into the outer polepiece, thereby retaining frictional losses with only the remaining sleeve portion in the inner polepiece. Small prior art air gaps at interfaces 42,44 between the polepieces and the housing are eliminated to minimize reluctance of the magnetic circuit. A significant increase in actuating force is realized in comparison with a prior art solenoid actuator.

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: An actuator is constructed so that the rotor is rotated within the range of a preset angle in a direction corresponding to the direction of current supply to the stator coil. The rotor includes a column-shaped permanent magnet having surfaces perpendicular to a center line of rotation and a surface surrounding the center line of rotation and a frame body configured integrally with the permanent magnet. The frame body covers two center portions of rotation of the permanent magnet and the surface surrounding the center line of rotation of the permanent magnet so that a plurality of exposed surfaces are provided. Each of areas in which these center portions of rotation are covered is provided with a journal supported by the bearing of the stator, and a portion extending in the radial direction from one of the center portions of rotation is provided with the out-put pin to be parallel to the center line of rotation.

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: A proportional solenoid valve for a high-pressure diesel pump of a motor vehicle has a housing and a solenoid with an armature movable in the housing. A bushing is provided, and a piston is arranged in the bushing. The armature acts on the piston for moving the piston in the bushing as a function of a current supply to the solenoid. At least one component is positioned between the bushing and the housing and is deformable in an axial direction of the piston so as to allow an exact adjustment of the position of the piston relative to the bushing.

Abstract: An electromagnetic injector for controlling a fuel quantity to be fed into an internal combustion engine includes a valve body displaceable by an electromagnetic coil system, the valve body acting together with a magnet armature of the electromagnetic coil system. The electromagnetic coil system includes at least two concentrically positioned coils integrated into the magnetic circuit so that in each case a first pole body is positioned between two adjacent coils, and the inner and outer coil are respectively adjacent to a second pole body, the first and second pole bodies are components of the magnetic circuit of the electromagnetic coil system, and in each case adjacent coils may have a common field current flowing through them in opposite directional sense to each other.

Abstract: A normally closed electromagnetic valve has a cylindrical valve housing; a valve seat member; a fixed core; a movable core; a valve body; a return spring; and, a coil, one side of the valve housing being housed in a mounting hole opened on one end of a substrate so as to be restricted in axial movement thereof toward the interior of the mounting hole, wherein a large diameter portion is provided in the axially middle portion of the valve housing, the cylindrical valve seat member forms an annular chamber with the inner surface of the large diameter portion, the annular chamber communicates to the valve chamber, and is fixed to and fitted in one end of the valve housing and communicating holes through which the annular chamber is communicated to the exterior of the valve housing are provided in the large diameter portion.

Abstract: The present invention is directed to an electromagnetic actuator for a device having a first component which is movable relative to a second component, the electromagnetic actuator comprising a coil which is coupled to the first component; a magnetically permeable core which is coupled to the second component and which comprises an annular pole having first and second ends, a cylindrical keeper positioned around the pole, and a base connecting the first end of the pole to an adjacent end of the keeper; wherein the inner diameter of the keeper is greater than the outer diameter of the pole and the coil is positioned between the keeper and the pole; a magnet which is magnetically coupled to the core and which produces a magnetic field having flux lines that flow through the keeper, the base and the pole and across the coil; wherein the pole comprises an inner annular surface which is tapered from the first end to the second end to reduce the inductance of the coil and thereby permit the actuator to generate a g

Abstract: A coil assembly comprises a coil wound upon a bobbin. A pair of terminals is supported by the bobbin. The coil has a pair of lead wires, each of which is connected to one of the terminals. Each terminal is adapted to be coupled to an electronic control unit. The coil is enclosed at least in part by a flux return casing. At least one resilient member is arranged and configured to urge the bobbin and the casing axially downward.

Abstract: A method for manufacturing a transfer switch includes providing a transfer switch including a first shunt contact and a second shunt contact, and operationally coupling a shunt solenoid to the first shunt contact and the second shunt contact such that when the solenoid is electrically activated the first shunt contact electrically couples a first source to a load and the second shunt contact electrically couples a second source to the load in a first pre-determined amount of time.

Abstract: An electromagnetic actuator has a movable core, a housing that holds the movable core so that the core may freely reciprocate, and an attractive part that applies a magnetic force to pull the movable core in one of the reciprocating directions. The electromagnetic actuator further has a stator that constitutes a magnetic circuit along with the movable core. At least one of the sliding faces of the housing and the movable core in contact with each other is subjected to gas soft nitriding, salt-bath soft nitriding, sulfo-nitriding, or nitriding treatment. The surface roughness of such a nitrided face is controlled to be within a prescribed range, so that the wear of the sliding faces of the movable core and the housing can be reduced.

Abstract: A proportional activation magnet (1) for a hydraulic solenoid valve has a pole (3) with a valve cone receiving bore (17) for receiving a valve cone (20) and a pole tube (14) for receiving an armature (30). An armature tappet (33) extends between the armature (30) and valve cone (20). A retention area (35) with a tappet passage opening (36) is provided around the armature tappet (33) in a region between the valve cone receiving bore (17) and pole tube (14). An annular gap with a predefined gap width is formed between the inside of the tappet passage opening (36) and the outside of the armature tappet (33) which extends in the tappet passage opening (36).

Abstract: The present invention is directed to an optical deflector. The optical deflector includes a support body, a movable plate, a pair of first elastic portions connecting the movable plate and the support body, a pair of second elastic portions connecting the movable plate and the support body, a first drive wiring extending through the support body, the first elastic portions and the movable plate, a second drive wiring extending through the support body, the second elastic portions and the movable plate, and a magnetic field generator. The movable plate has a reflecting surface to reflect a light beam. The first and second elastic portions are elastically deformable to allow the movable plate to rotate about first and second rotational axes, respectively. The first and second drive wirings include parts that are positioned in the movable plate and respectively extend in parallel with the first and second rotational axes.

Abstract: In a solenoid valve device, a housing has a stopper formed on an inner wall of a fluid passage around an axial end of an accommodation bore. A valve seat member fixed to an inner circumferential wall of the fluid passage has a through-hole causing an input port to communicate with a drain port, a communication bore causing the through-hole to communicate with an output port and first and second valve seats formed around both ends of the through-hole, respectively. A movable member has a contact portion accommodated in the fluid passage between the stopper and the second valve seat. A ball is arranged on an opposite side to the contact portion with respect to the valve seat member. When the movable member moves with a movable core, the contact portion resting at the stopper or the second valve seat defines reciprocating moving stroke of the movable member.

Abstract: A solenoid assembly includes a solenoid having a magnetic circuit comprising stationary primary and secondary pole pieces and a moveable armature. The primary pole piece includes an inner cylindrical wall operable to define, with the armature, a fixed radial gap for the passage of magnetic flux, and a tapered outer wall operable to increase the mass of the pole piece through which flux may pass, as the armature moves axially within cylindrical inner wall, the primary pole piece further includes an inwardly tapered, conical portion that extends toward the armature which operates, with an associated conical portion on a periphery of the moveable armature, to substantially maintain the axial opening force on the armature by establishing a secondary gap for the passage of magnetic flux as the armature approaches the conical tapered portion of the cylindrical wall to compensate for the saturation of magnetic flux through the fixed air gap.

Abstract: In order to achieve a reduction in the switching noise during operation of an electromagnetic switching device with little complexity, a coil for moving an armature with moving switching contacts is driven in order to make contact at a first minimum value of a supply voltage. The supply voltage is then increased from the first minimum value to a second minimum value as a function of time, such that the moving switching contacts can be moved with the stationary switching contacts into sufficient mutual contact with pressure applied.

Abstract: In an electromagnet having an armature, in particular for use in a solenoid valve, which includes a solenoid coil (1), a magnet core (2) which passes through the solenoid coil (1) and has at least one pole face (22), an armature (3) which is supported perpendicularly to the at least one pole face (22) of the magnet core (2) so as to be able to slide and has an armature plate (31) facing the pole face (22) and an armature pin (32) that projects from the armature plate (31) and is supported so as to be able to slide and rotate, and adjusting means which are formed on the electromagnet and/or on the armature and adjust the armature plate (31) to a predetermined rotational position, it is proposed that

Abstract: What is proposed is a bistable electromagnetic valve (1) with a valve chamber (7) arranged between two pole pieces (5, 6) and with a valve body (8) which is located therein and is displaceable between two end positions and which is designed as a magnet for at least one permanent magnet (12, 13) and for at least one control coil (3), said valve being capable of being implemented in a small form of construction. This is achieved, according to the invention, in that at least one fluid duct (15) is provided as an inflow in the axial direction between the outer wall of the pole piece (5) and the valve housing (2).

Abstract: A electrical solenoid suitable for fluid controls applications with an elastomeric retaining device of an elastomeric material arranged between the housing and the lamination stack. The elastomeric retaining device eliminates the need for potting compound and the associated steps of filling the housing with potting and curing the potting compound. The solenoid has a wire coil wound about the lamination stack in which the wire coil has an electrical connection extending through the housing for electrical communication with an external electrical control. The end of the lamination stack projects out of the housing slightly after manufacturing and assembly. When the solenoid is mounted, the elastomeric retaining device biases the lamination stack against the mounting surface. The wire coil is pre-assembled in a wire coil assembly comprising a bobbin, a wire coil wound about the bobbin and a plastic overmold encapsulating the wire coil and bonded to the bobbin.

Abstract: Apparatus for commutating turns of a stator coil for a helical coil launcher. An annular brush assembly includes an annular support and a plurality of electrical contacts disposed circumferentially about the annular support for contacting the stator coil. A projectile for a helical coil launcher is also disclosed having an armature coil and a body assembly containing at least one annular brush assembly for contacting a stator coil that is slidably engaged with the projectile.

Abstract: There is provided an electromagnetic actuator which includes a coil disposed about a tube bearing a movable armature, the coil being electrically connectable to a circuit configured to provide a current to the coil to generate a magnetic field and magnetic flux in at least one direction. The movable armature is magnetically coupleable with the coil. A flux adjustment element is also provide and is configured for movement within a magnetic flux output by the coil so as to increase a magnetic flux input to the armature upon movement of the flux adjustment element in a first direction and to decrease a magnetic flux input to the armature upon movement of the flux adjustment element in a second direction, wherein the flux adjustment element is externally disposed about a distal end of the tube.

Abstract: An apparatus and method that tests an NMR system, including MRI scanners, by taking H-B measurements for the apparatus at any stage during the manufacture thereof, to thereby detect any defects of the NMR system at any point during the manufacture thereof.

Abstract: A solenoid valve for brake systems is disclosed. This solenoid valve is preferably used as an outflow control NC-type solenoid valve mounted on the oil return line of an electro-hydraulic brake system (EHB). This solenoid valve comprises a hollow valve housing having a radial inlet passage, a plunger movably received in the bore of the valve housing so as to axially move in the bore in opposite directions, and a valve seat set in the bore of the valve housing, with an orifice axially formed in the valve seat such that the orifice is opened or closed by a control ball of the plunger. A radial oil port is formed on the sidewall of the valve seat so as to allow oil from the oil inlet passage of the valve housing to flow into the valve seat, and flow from the valve seat toward the plunger through the orifice.

Abstract: Electromagnetic coils having rectilinear cross-section core elements with an enlarged head end adjacent to a moving armature bar having a rectilinear cross-section are described in a handheld tattoo apparatus. This results in increased vibrational smoothness as sensed by the tattoo artist.

Abstract: To lighten the weight of an electromagnetic actuator and a valve-open-close mechanism by forming the stems from a lighter material than conventional. A pair of electromagnets formed of stators and coils are opposed to each other with a gap therebetween. An armature is disposed in the gap so as to be reciprocable between one electromagnet and the other electromagnet by the electromagnets. A first stem for transmitting the movement of the armature from one electromagnet toward the other electromagnet to a valve of the internal combustion engine is inserted in a guide hole formed in the stator of one electromagnet. The first stem is formed of a lighter material than the armature to lighten the weight of the electromagnetic actuator and a valve-open-close mechanism of an internal combustion engine.

Abstract: An apparatus for operating a pan/tilt device has been developed. The apparatus is capable of rotating greater than a full circle due to the presence of a single inductive core. The segments of the core are separated by an inductive gap that prevents contact between the segments. Both power and control signals to the pan/tilt device are transmitted across the core.

Abstract: An electro-magnetic actuator includes a shaft having a first end portion and a second end portion and a nut having an inner peripheral surface and an outer peripheral surface. The inner peripheral surface of the nut is coupled with the first end portion of the shaft. A bearing is disposed around the second end portion of the shaft for rotatably supporting the shaft. An electrical coil is disposed around the shaft between the nut and the bearing for receiving electrical current and producing magnetic flux. A ferromagnetic can is disposed around the shaft having a peripheral surface extending between the shaft and the outer peripheral surface of the nut for establishing a path for magnetic flux flow there between. The peripheral surface of the can is interposed between the electrical coil and the bearing partitioning the electrical oil inside the can and the bearing outside the can.

Abstract: An electromagnetic adjusting device for automatic transmissions of motor vehicles has an electromagnet having a magnetic coil, a substantially cup-shaped housing which surrounds the magnetic coil and is composed of a ferromagnetic material, the housing having a housing bottom, a ferromagnetic central part which extends from the housing bottom and supports the magnetic coil, and a movable armature located before the central part and leaving a working air gap so as to form with the housing and the central part a magnetic circuit which has a magnetic resistance for a magnetic flux, and means for changing the magnetic resistance, the means for changing the magnetic resistance including an axial depression provided in the central part and an axially displaceable ferromagnetic filling member inserted in the depression and limiting with a bottom of the depression an auxiliary air gap.

Abstract: An apparatus and a method for locking and removing a pen using electromagnetism are provided. The apparatus includes a pen housing, a DC source, a coil, a first magnetic element attached to the pen, a second magnetic element and a switch. In some embodiments, a third magnetic element is included. To remove the pen from the pen housing, a user activates a button to magnetize one of the magnetic elements to mutually repel the other. Consequently, the pen is displaced by the repulsion of either the pen from its housing or the pen housing carrying the pen. The pen thus has a protruding end which the user grips to remove the pen from the housing. To lock the pen, the pen is inserted into the housing to be mutually attracted with a magnetic element to be retracted to a locked position.

Abstract: An improved solenoid for providing linear actuation. The outer polepiece of the solenoid is provided with a plurality of radially-dispersed labyrinthine passageways in communication between the exterior of the solenoid and an interior region including the armature and the interior of the windings. The polepiece is further provided with at least one passageway in communication between the exterior of the solenoid and an outer periphery of the windings within the housing. The two sets of passageways impede particles and droplets of moisture from entering the solenoid, while simultaneously permitting moisture such as condensation within the solenoid to evaporate and escape.

Abstract: A control method for an electromagnetic actuator for the control of a valve of an engine from an abutment condition, in which an actuator body actuating the valve and disposed to move between two electromagnets is maintained in abutment against a first excited electromagnet and against the action of at least one elastic body; in order to bring the actuator body into abutment against a second electromagnet, the first electromagnet is de-excited and the second electromagnet is then excited by means of excitation parameters, which are determined as a function of the measurement of the mean value of the disturbance force acting on the valve during the stage of de-excitation of the first electromagnet.

Abstract: The present invention relates to an electromagnetic valve of a cartridge-type construction comprised of a magnetic core, a magnetic armature (12) with valve closure member (4), and a valve seat member which form an operative unit in a valve housing, the said valve housing including a closed sleeve portion (1) which has a collar (17) on the opposite open end area for attachment in the valve housing. Inserted telescopically into the open end area of the sleeve portion (1) is a sleeve-shaped annular part (2) which carries the valve seat member (3) and aligns the latter concentrically in relation to the valve closure member (4) to form an operative unit.

Abstract: A solenoid for an electromagnetic valve is provided with a bobbin on which a coil has been wound, a movable iron core fitted into an iron core hole of the bobbin and a fixed magnetic pole member attracting the movable iron core, the movable iron core has a main body portion with an even section fitted into the iron core hole, and a flange portion with an even section formed on a portion extending from the iron core hole of the main body distal end, and the ring has a first portion which is positioned on a distal end side and which has a large diameter hole in which the flange portion is fitted and a second portion which is positioned on a proximal end side and which has a small diameter hole in which the main body portion is fitted.

Abstract: A shock absorber comprises a magnetized plunger and a conductive coil disposed about the magnetized plunger. The coil forms a circuit that generates an electromagnetic force so as to damp movement of the magnetized plunger and a wheel coupled to the magnetized plunger. Movement of the magnetized plunger within the conductive coil may itself create a current, which may be stored by a battery for subsequent use.

Abstract: A brake-transmission shift interlock device 10 for an automatic transmission system includes a solenoid 14 secured to a support member 12 that positions the solenoid 14 so as to block movement of a transmission member 176 to prevent a transmission shifter from being moved from a park position. The solenoid 14 includes a plunger 50 having first and second portions 76 and 78. The second plunger portion 78 engages the transmission member 176 laterally on a side wall 94 if the brake pedal is not depressed and the shifter is in the park position. To prevent the plunger 50 from binding, the second plunger portion 78 is allowed to axially offset from the first plunger portion 76 thereby reducing the required lineal force to move the plunger 50 from a first to a second position when the solenoid 14 is energized.

Abstract: The invention relates to a winding that is received in a magnet pot. The winding is formed of a wire, in particular baked enamel wire, which is provided with a coating that causes the winding to hold together. In producing the magnet coil, the winding is inserted into the magnet pot and then potted with a low-viscosity potting material.

Abstract: A circulating system (10) for circulating a fluid (22) from a fluid source (28) around a voice coil actuator (12) that includes a pair of spaced apart magnet arrays (32) and a conductor (36). The circulating system (10) includes a circulation housing (26) and a fluid inlet (86). The circulation housing (26) is sized and shaped to encircle at least a portion of the conductor (36) and provide a fluid passageway (54) around the conductor (36). The fluid inlet (86) extends into the fluid passageway (54) and is in fluid communication with the fluid source (28). Fluid (22) from the fluid source (28) is directed through the fluid inlet (86) into the fluid passageway (54). Preferably, the flow rate of the fluid (22) is controlled to maintain an outer surface of the actuator (12) at a set temperature to control the influence of the actuator (12) on the surrounding environment and the surrounding components.

Abstract: In an electromagnet (10) having a magnet coil (13), which has an exciter winding (23) wound from an insulated winding wire (24), having a magnet core (14), having a movable armature (16) opposite the magnet core (14), and having a restoring spring (21) engaging the armature (16), a plurality of meltable stanchions (26) of electrically conductive material that are connected electrically conductively to one another are disposed on the magnet coil (13), for the sake of later calibration of the magnetic force furnished by the completed electromagnet (10). The winding wire (24) is guided around each of the stanchions (26), in selected windings of the exciter winding. To adjust the desired magnetic force, at least two stanchions (26) are melted, so that they form a reliable weld with the winding wire (24), through the wire insulation thereof.

Abstract: A bi-directional latching actuator is comprised of an output shaft with one or more rotors fixedly mounted thereon. The shaft and rotor are mounted for rotation in a magnetically conductive housing having a cylindrical coil mounted therein and is closed by conductive end caps. The end caps have stator pole pieces mounted thereon. In one embodiment, the rotor has at least two oppositely magnetized permanent magnets which are asymmetrically mounted, i.e., they are adjacent at one side and separated by a non-magnetic void on the other side. The stator pole piece has asymmetric flux conductivity and in one embodiment is axially thicker than the remaining portion of the pole piece. An abutment prevents the rotor from swinging to the neutral position (where the rotor magnets are axially aligned with the higher conductivity portion of the pole piece). Thus, the rotor is magnetically latched in one of two positions being drawn towards the neutral position.

Abstract: An iron core comprising an outer yoke, side poles disposed on both end portions of the outer yoke, and a center pole disposed between the side poles, wherein a magnetic path of polar portions of the center pole is formed as an open-circuit. There can be restricted for short-circuiting of magnetic flux of permanent magnets and thrust of an oscillator disposed at an air gap formed between electromagnets can be improved.

Abstract: An electromotive linear drive includes one or more drive motors and a corresponding number of torque-reducing transmissions and corresponding driven spindles and a casing. The casing is comprised of two casing parts, whereby the abutting surfaces of the casing parts are sealed by a sealing element or a plurality of sealing elements. Connecting terminals for mechanical and/or electrical components are provided on the exterior of the casing parts.

Abstract: An electromagnetic drive device is proposed comprising an electromagnet (21) having a magnetizable core (22) with a plurality of limbs (23 and 24) and an energizable winding arrangement (35) surrounding at least one limb (23 and 24) of the core (22). Furthermore there is a magnetizable magnet armature (15) able to be moved in relation to the core ((22) by varying the winding arrangement current. The (22) core has at least one U arrangement and is formed essentially by a plurality of sheet metal elements (30) resting against each other and extending athwart the direction of the parallel limbs (23 and 24), the parallel limbs being respectively surrounded by one winding (33 and 34) of the winding arrangement (35).

Abstract: Positioning device with a first part and a second part which are movable relative to each other in at least one direction. Said first part comprises a carrier on which a system of magnets with N and Z magnets are arranged in an alternating manner and having a flux density B(x)=B(x+2&tgr;), &tgr; being the magnetic pole pitch. Said second part comprises an electric coil system with at least one coil block unit, each unit having k coil blocks with k]2, said coil blocks having conductors, all conductors belonging to the same coil block being oriented in the same direction and fed by a n-phase system with n]2.

Abstract: An electromagnetic solenoid actuator comprising a cylindrical casing, an electromagnetic coil arranged in the casing, a fixed iron core arranged in the electromagnetic coil, a moving iron core arranged to come in contact with, and separate away from, the fixed iron core, and an operation rod mounted in the moving iron core, wherein provision is made of a position-limiting mechanism for limiting the operation rod to a plurality of operation positions according to a thrust produced by the operation rod in compliance with the amount of electric power fed to the electromagnetic coil.