EP1953773B1 - Double action electromagnetic actuator - Google Patents
Double action electromagnetic actuator Download PDFInfo
- Publication number
- EP1953773B1 EP1953773B1 EP08001443.4A EP08001443A EP1953773B1 EP 1953773 B1 EP1953773 B1 EP 1953773B1 EP 08001443 A EP08001443 A EP 08001443A EP 1953773 B1 EP1953773 B1 EP 1953773B1
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- European Patent Office
- Prior art keywords
- magnetic
- armature
- electromagnetic actuator
- coil
- pole
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/081—Magnetic constructions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/081—Magnetic constructions
- H01F2007/085—Yoke or polar piece between coil bobbin and armature having a gap, e.g. filled with nonmagnetic material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/13—Electromagnets; Actuators including electromagnets with armatures characterised by pulling-force characteristics
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/16—Rectilinearly-movable armatures
- H01F7/1607—Armatures entering the winding
- H01F7/1615—Armatures or stationary parts of magnetic circuit having permanent magnet
Definitions
- the invention relates to a double-acting electromagnetic actuator, in particular for hydraulic and pneumatic applications, with a coil, an armature arranged in the coil with at least two magnetized in the axial direction permanent magnet and a central disc between the permanent magnets, wherein between armature and coil in the axial direction stronger or slightly magnetizable areas are provided and between these a weakly or Vietnamesemagnetisierbarer area is formed.
- Double-acting electromagnetic actuators in hydraulic and pneumatic applications are known. When connected to a valve, they can switch the valve to three states.
- Such actuators are for example in the US 6,422,533 and the US 5,434,549 shown.
- DC solenoids for operating hydraulic valves have been common for many years.
- DC magnets have at least two limiting properties.
- the force is generated only in one direction.
- Double-acting magnets with two magnet bodies on a tube are relatively long and prone to damage.
- the inductance of a coil is relatively high, which makes the magnets slow.
- the inductance depends on the stroke. This variable inductance can lead to stability problems in control loop applications. Therefore, bidirectional electromagnetic actuators with double acting force have been developed. The advantage of this is that in an emergency, in case of power failure, the valve falls back into a fail-safe location.
- an actuator according to claim 1 The armature is arranged in a pole tube, in particular mounted, which is provided in the coil.
- the pole tube creates a movement space in which the anchor can work reliably.
- the pole tube has the task of receiving the anchor or the anchor rod. It thus also forms a connection possibility of the actuator according to the invention to the element to be influenced, for example an actuator assembly, a valve or the like. It is also possible in principle to realize a correspondingly tight connection here, wherein the preferably integrally formed pole tube protects the sensitive electronics, namely in particular the bobbin and the winding, since the medium may optionally enter the pole space, but which is sealed to the coil.
- the Polraum also has the task optionally to provide a storage of the anchor available. Since the armature is arranged on the anchor rod, the armature is possibly also indirectly (likewise according to the invention) via the anchor rod, which is mounted in corresponding bearings in the pole space. But it is also possible to realize a separate storage of the anchor rod, for example by a corresponding sliding bearing. In this way, a reliable operation of the actuator is ensured, wherein in the configuration of the actuator preferably on components, as they are known, for example, in the field of electromagnetic production, can be used, resulting in a cost-effective implementation of the invention.
- the pole tube is designed pressure-tight.
- the pole space accommodating the armature may also be part of the medium circuit which is to be influenced by the actuator. Due to the pressure-tight design is achieved that, of course, no loss of media in the actuator under pressure and on the other hand it is also ensured that no aggressive medium under certain circumstances can attack the current-conducting areas or other areas of the actuator.
- the mode of operation of the actuator depends on the design of the weak or nonmagnetic region in relation to the more or slightly magnetizable region.
- the basically more magnetizable region is described as a "magnetizable region” and the weak or nonmagnetic region is fundamentally intended as a "nonmagnetic region", without wishing to reduce the invention to precisely this specific application, in particular of the nonmagnetic region. It is clear that it is according to the invention What matters is that the magnetization in the weak or non-magnetic region in each case is less, as in the stronger or slightly magnetizable region to act according to the invention.
- the pole tube also leads to an amplification of the magnetic field generated by the coil, when the pole tube is preferably made of a magnetizable material.
- the generated magnetic field force is approximately proportional to the input current.
- the pole tube has the stronger or slightly magnetizable areas and the weak or non-magnetic area.
- the various functions of the device are integrated in the available components to reduce the number of components.
- the pole tube thus also has the task of providing the magnetizable or non-magnetic region.
- the invention also includes solutions in which the pole tube does not affect the magnetic properties of the device and the magnetizable region or non-magnetic region by additional elements, such as a sleeve or a tube disposed inside or outside of the pole tube be realized.
- a symmetrical construction of the armature is proposed with respect to a center plane of the coil.
- a center plane of the coil while a plane perpendicular to the coil axis is considered, which serves as a plane of symmetry of the coil.
- the coil is provided symmetrical arrangement of the strong or easily magnetizable region and the weakly or Vietnamesemagnetisierbaren region.
- the weak or non-magnetic region is centered on this pole space.
- the non-magnetic region is formed as an air gap.
- the pole tube is formed of two sub-tubes, which are spaced appropriately to provide the air gap.
- a separate element for example a corresponding sleeve or a tube which / s forms the magnetizable region, in two sub-elements split and space to provide, with a continuous pole tube, also an air gap to form the non-magnetic region.
- the non-magnetic region consists of solid material, whereby the pole tube has a corresponding mechanical stability and also easier to assemble, since this is then processed and aligned accordingly in a processing step and a separate alignment of the two sub-tubes is not necessary.
- the non-magnetic region may be made, for example, of a non-magnetizable metal material. This is particularly advantageous in order to better bond together the sleeve-shaped or ring-shaped or tubular magnetic region or stronger magnetic region which is connected thereto on both sides in the axial direction.
- the weak or non-magnetic region can be made of a non-magnetizable plastic or plastic composite.
- the pole tube with the weak or non-magnetic region is already formed.
- the pole space in which the permanent magnets are located extends beyond only one half of the coil.
- the other half is preferably magnetizable solid material which enhances the magnetic effect of the coil.
- the pole space extends beyond the coil to the side remote from the armature rod and is correspondingly closed there by a sealing plug.
- the non-magnetic region in the pole tube in the rest position of the armature in the axial direction is arranged approximately opposite to the central disk.
- the permanent magnets which are magnetized in the axial direction, are arranged on the armature such that polarity is symmetrical with respect to the central disk.
- a respective disk is arranged on the end faces of the permanent magnets.
- the structure of the armature according to the invention is derived from the conventional anchor design. It follows, therefore, that the permanent magnet is cleverly embedded symmetrically on the known configuration of an armature and on the side facing away from the central disc of the permanent magnet is followed by another disc.
- the anchor has a correspondingly symmetrical structure, that is, that the thicknesses of the outer discs are the same.
- the thicknesses of the two permanent magnets are cleverly the same. Of course, the thickness of the permanent magnets may be different from the thickness of the outer discs.
- the disk adjoining the permanent magnets is at least one ferromagnetic pole disk.
- the central disk between the permanent magnets may be made of a nonmagnetic or weakly magnetic material or preferably, as shown above, to improve the magnetic properties of a ferromagnetic material.
- the central disk can have a larger diameter than the pole disks and the permanent magnets.
- the inner diameter of the pole tube is reduced at both ends, in which standard bearing bushes, which are made of ferromagnetic material and designed with a corresponding sliding coating, are inserted into the pole space of the pole tube.
- the permanent magnets and the pole disks are thus each guided in bearing bushes.
- the central disk is formed to be approximately as wide as the non-magnetic region.
- the anchor has an anchor rod on which the pole discs, the permanent magnets and the central disk are arranged.
- the double-acting electromagnetic actuator is provided in particular for pneumatic or hydraulic applications in which the pole tube is in contact with the fluid and the pole tube is designed in particular durckdicht, the anchor rod for pressure equalization on a through hole.
- the magnetizable region adjoins the non-magnetic region at a boundary surface and the thickness of the magnetizable region in the region of the boundary surface relative to the (inner) armature begins either from the inside outwards or from the outside towards the outside reduced in
- the variants described here are particularly in FIGS. 9 and 10 shown.
- the configuration of the end region of the magnetizable region towards the nonmagnetic region decisively influences the characteristic design of the actuator according to the invention.
- the course of the boundary surface is optionally angled and influence or modify the force curve accordingly by this course.
- the influence of the magnetizable region depends on how it interacts with the permanent magnets of the armature.
- the magnetizable region decreases inwards starting from the outside, with respect to the armature, this means that, as in FIG Fig. 9 shown, at the armature facing the inner side nor the magnetizable area (seen in the radial direction with respect to the anchor rod or the armature), in the outer region already the non-magnetic area.
- the course of the boundary surface is also reversible, as in Fig. 10 is shown, in which, starting inside the magnetizable region is reduced in thickness.
- the weak or nonmagnetic region are two weakly nonmagnetic subregions arranged in axial direction one behind the other.
- the outer edges or boundary surfaces of these areas affect the force characteristic and are therefore again oblique and not smooth.
- the inner edges or inner boundary surfaces of the nonmagnetic partial regions to the magnetic region can have simple, preferably 45 °, particularly preferably straight angled surfaces.
- the weakly or non-magnetic portions are uniform, preferably substantially mirror-inverted.
- a completely asymmetrical force characteristic is achieved in a simple manner in a symmetrical design of the actuator according to the invention.
- a symmetrical force characteristic curve or an approximately symmetrical force characteristic curve is nevertheless achieved by influencing in a suitable manner by the arrangement or configuration of the boundary surface.
- the configuration of the boundary surface is symmetrical with respect to a plane of symmetry or deviating therefrom.
- the individual boundary surfaces can also be designed differently in order to realize corresponding characteristic curves.
- the configuration of the boundary surface, its orientation and section-wise slope forms another parameter, which in suitable Mode can be influenced to achieve corresponding properties of the device according to the invention.
- the pressure-tight pole space one side of which serves for insertion of the armature, is sealed by a stopper.
- This plug can be made of a non-magnetizable material.
- the plug is made of a ferromagnetic material to affect the magnetic field positive and reinforcing.
- the plug can also be made longer to change the magnetic force field.
- At least one pole disc is designed to extend towards the stopper and extends in particular out of the body of the coil.
- the coil and pole tube are not separate but integrated trained.
- the pole tube and the stopper may each have bearings for guiding the anchor rod. This ensures that no friction of the permanent magnets or pole disks or central disk occurs in the cylindrical pole space.
- An inventive double-acting actuator has a pressure-tight design, which has a working stroke, similar to conventional, single-stage solenoid valves.
- Existing magnetic production methods can be used, whereby a cost-effective implementation is possible.
- the armature enters a fail-safe center position when the actuator is not energized.
- the direction of the force is dependent on the direction of the coil current and, over a limited stroke, relatively independent of the position of the armature.
- the actuator can be used for all electromagnetic actuator applications that require a bidirectional force.
- the Fig. 1 shows an electromagnetic actuator 1 in cross-section of a side view.
- an armature 2 is arranged in a cylindrical pole tube 10.
- the pole tube 10 has a pole space 16, which is closed pressure-tight by a stopper 30 and a round seal 40 to one side.
- a stopper 30 is closed pressure-tight by a stopper 30 and a round seal 40 to one side.
- another round seal 50 for sealing against an attachable valve body, not shown.
- the valve body is actuated by the armature 2.
- the armature 2 comprises an anchor rod 24, on which in the region of the pole tube space 16, two permanent magnets 22, 25 are arranged. Between the permanent magnets 22, 25, a central disk 23, preferably made of ferromagnetic material is arranged. The front side in the axial direction to the permanent magnets each made of a ferromagnetic material Polarchitecture 21 and 26 is arranged.
- pole disks 21, 26, the permanent magnets 22, 25 and the central disk 23 can slide as smoothly as possible in the cylindrical pile tube space 16 and can guide the anchor rod 24 of the armature 2, the inner surfaces of the pile tube space with a film, in particular a PTFE (polytetrafluoroethylene) Film coated as bearing 60.
- a film in particular a PTFE (polytetrafluoroethylene) Film coated as bearing 60.
- a magnetic body 70 Around the pole tube 10 is a magnetic body 70 with an electromagnetic coil 71.
- the pole space 16 extends from the one end side of the coil 71 to about half of the coil 71st
- a weak or non-magnetic region 8 is provided in the outer peripheral surface or lateral surface of the ferromagnetic pole tube 10.
- the pole tube 10 in addition to the non-magnetic region 8 and the magnetizable region 7.
- a boundary surface 79 is provided between the magnetizable region 7 and the non-magnetic region 8.
- the boundary surface 79 is seen in cross-section of the side view obliquely, the outer circumference radially outward increasingly, in particular to a parallels of the direction of movement of the armature 2 or coil axis of the coil 71 concave, not straight and possibly not smooth.
- non-straight boundary surfaces 79 or this not straight transition leads to a force characteristic that does not depend directly on the stroke.
- the transitions are perpendicular, that is formed radially. Edges of these transitions act like pole cores.
- the nonmagnetic region 8 thus divides the pole tube 10 into two pole cores 11, 13.
- the permanent magnets 22, 25 thus each form a closed magnetic field 72 and 73, each having a pole core 11, 13 of the pole tube 10, which is a mirror image of the nonmagnetic region 8 is. It is understood that the magnetic field 72 and 73 is arranged in each case annular to the armature axis when the coil 21 is not energized.
- a magnetizable region 7 according to the claim is understood to mean a stronger or slightly magnetizable region whose magnetization is generally greater than the magnetization of the nonmagnetic region 8, which is possibly weak or even nonmagnetic.
- the anchor rod 24 has a through hole 28.
- the anchor could alternatively also be drilled through.
- the Fig. 2 shows in a schematic cross section a side view of a particular embodiment of the invention Double acting actuator 1.
- This differs from the embodiment according to the Fig. 1 in that the central disk 23 has a larger diameter than the permanent magnets 22, 25 and the pole disks 21, 26.
- the pole disks 21, 26 and the permanent magnets 22, 25 are stepped in, in particular magnetic, sleeves or sleeve-shaped bushings 62 out.
- the bushings 62 have in their inner surfaces a film, preferably made of PTFE for improved lubricity.
- the Fig. 2 also shows the magnetic flux field 74 in dashed line for movement of the anchor rod 24 from the pole tube 1.
- the armature is pulled out of the pole tube 10 at a positive current in the indicated arrow direction.
- the magnetic flux of one permanent magnet 25 is amplified by the coil 71 and the magnetic flux of the other permanent magnet 22 is reduced.
- the different magnetic fluxes through the two pole cores 11, 13 cause a net force that pulls the armature 2 out of the pole tube 10 in a positive direction.
- the Fig. 3 shows the current flow in the coil in the reverse direction. This results in a Kraftflußfeld 76, the after Fig. 2 is just opposite.
- the force field lines of the power flow field 76 run in the counterclockwise direction.
- the current flow of the permanent magnet 22 is amplified and the magnetic flux of the permanent magnet 25 is reduced. This results in a lifting movement of the armature 2 in the pole tube 10. It thus takes place a movement in the negative direction.
- the double acting actuator according to Fig. 3 is also characterized by the fact that the anchor rod 24 is guided by two bearings 92 and 94. This can advantageously minimize friction.
- the one bearing 92 is arranged coaxially in the pole tube 10, while the second bearing 94 is inserted in the stopper 30.
- the Fig. 4 shows the electromagnetic double-acting actuator 1 in a further embodiment with two non-weak or weak magnetic portions 82, 84.
- the non- or weak magnetic region 82, 84 is thus split and has an enlarging effect. Accordingly, the central disk 23 is formed significantly wider.
- only the outer boundary surfaces or transition regions from the end faces of the pole tube 10 act on the properties of the force characteristic of the actuator 1.
- the inner edges or inner boundary surfaces or transitions from the non-magnetic region 82, 84 to the magnetic shell of the pole tube 10 may have simple angles, in particular 45 ° angles and preferably straight surfaces.
- the design is also variable, such as in FIGS. 9 and 10 shown with respect to execution and inclination of the boundary surfaces feasible.
- the edges or boundary surfaces of these transition areas act like pole cores.
- the non-magnetic region 8, 82, 84 can be produced by various manufacturing methods.
- the stopper may be made of either ferromagnetic or non-magnetic material.
- the permanent magnets 22, 25 are magnetized in the axial direction and are arranged so that each same poles are directed to the end faces and same poles are directed to opposite surfaces. In the present example, the S-poles are directed to the outer end sides of the armature 2.
- FIG. 12 shows a force characteristic diagram according to the embodiment shown in FIG Fig. 1 and 3 is shown.
- the shape of the pole core influences the desired force characteristic.
- the Fig. 5 shows a typical force characteristic when the pole cores 11, 13 are installed at simple angles.
- the Fig. 6 shows a force characteristic diagram with a flatter force curve. This can be achieved if the pole cores 11, 13 (or differently configured boundary surfaces 79) contain two or more different angles.
- the Fig. 7 shows a force characteristic with a stepped armature, according to the embodiment, as shown in the Fig. 2 is shown.
- the rated force is about 15% lower than that of a cylindrical, in the Fig. 1 and 3 shown anchor can be achieved.
- the electromagnetic double-acting actuator 1 can thus be achieved with a working stroke, a flat characteristic, similar to standard magnets.
- the force characteristic can be optimized by Polkerne (or boundary surfaces 79) with multiple angles.
- the pressure-tight pole tube 10 is formed similar to standard electromagnets, so that existing standard magnetic body can be used.
- the electromagnetic double acting actuator 1 is adaptable to all sorts of other sizes.
- Fig. 1 shows Fig. 8 a largely symmetrical configuration of the actuator according to the invention.
- a center plane of the coil 71 is considered, which is oriented at right angles to the direction of movement of the armature 2 and coil axis of the coil 71.
- the armature 2 In the rest position, ie the non-current-charged position, the armature 2 is positioned centrically with respect to the non-magnetic region 7, since this results in a corresponding equilibrium of forces of the different counter-directed magnetic forces.
- Due to the symmetrical structure closes at the relatively elongated Anchor 2 left and right respectively small air gaps 17 and 17 ', which limit the stroke of the armature to the left or right.
- On the left side is the air gap 17 ', which is between the bottom 14 of the pole tube 10 and the left disc 21.
- the pole tube 10 is, similar to Fig. 1 , created from a solid material, which is substantially cylindrical in shape on its outer contour and on the inside for receiving the armature 2 has a recess or bore.
- a seal 40 is provided on the right side of the air gap 17 bounded by the contact surface 32 of the stopper 30, which is inserted to the right, open end of the pole tube 10 and held by a caulking 31 or thread or the like pressure-resistant. To improve the seal, a seal 40 is provided.
- the pole cores 11, 13 are the regions of the magnetizable region 7 which adjoin the non-magnetizable region 8 and in particular have the boundary surface 79. Especially on the design of the pole cores 11, 13 in the region of the boundary surface 79, it is important to influence the force curve accordingly. This situation is magnified in Fig. 9, 10th shown again.
- the anchor rod 24 is located inside, since all elements that are radially further away from the anchor rod 24, corresponding to the outside.
- the thickness of the magnetizable region 7 decreases starting from the outside to the inside. This means that in the longitudinal direction of the pole first on the outside of the magnetizable region is weakened, whereas the inner, the armature 2 facing region is still present. This results in a circumferential groove in the pole tube 10 with inclined boundary surfaces 79 '.
- the boundary surfaces are not flat in itself, but angled.
- the invention is not fixed in any way, it can be bent according to the desired force curve, be spherical, stepped, flat, conical and so on.
- FIG. 10 shows Fig. 10 another application in which the thickness of the magnetizable region 7 is reduced starting inside out.
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Description
Die Erfindung bezieht sich auf einen doppeltwirkenden elektromagnetischen Aktor, insbesondere für Hydraulik- und Pneumatikanwendungen, mit einer Spule, einem in der Spule angeordneten Anker mit mindestens zwei in axialer Richtung magnetisierten Permanentmagneten und einer Zentralscheibe zwischen den Permanentmagneten, wobei zwischen Anker und Spule in axialer Richtung stärker oder leicht magnetisierbare Bereiche vorgesehen sind und zwischen diesen ein schwach- oder nichtmagnetisierbarer Bereich ausgebildet ist.The invention relates to a double-acting electromagnetic actuator, in particular for hydraulic and pneumatic applications, with a coil, an armature arranged in the coil with at least two magnetized in the axial direction permanent magnet and a central disc between the permanent magnets, wherein between armature and coil in the axial direction stronger or slightly magnetizable areas are provided and between these a weakly or nichtmagnetisierbarer area is formed.
Doppeltwirkende elektromagnetische Aktoren in Hydraulik- und Pneumatikanwendungen sind bekannt. Sie können, wenn sie mit einem Ventil verbunden sind, das Ventil in drei Zustände schalten.Double-acting electromagnetic actuators in hydraulic and pneumatic applications are known. When connected to a valve, they can switch the valve to three states.
Derartige Aktoren sind beispielsweise in der
Gleichstrommagnete zur Betätigung von Hydraulikventilen sind seit vielen Jahren üblich. Solche Gleichstrommagnete haben jedoch mindestens zwei beschränkende Eigenschaften. Die Kraft wird nur in eine Richtung erzeugt. Doppeltwirkende Magnete mit zwei Magnetkörpern auf einem Tubus sind relativ lang und anfällig für Beschädigungen. Außerdem ist die Induktivität einer Spule relativ hoch, was die Magnete langsam macht. Des Weiteren ist die Induktivität vom Hub abhängig. Diese variable Induktivität kann zu Stabilitätsproblemen in Regelkreis-Anwendungen führen. Es sind deshalb bidirektionale elektromagnetische Aktoren mit doppeltwirkender Kraft entwickelt worden. Der Vorteil bei diesen besteht darin, dass im Notfall, bei Stromausfall, das Ventil in eine ausfallsichere Stelle zurückfällt.DC solenoids for operating hydraulic valves have been common for many years. However, such DC magnets have at least two limiting properties. The force is generated only in one direction. Double-acting magnets with two magnet bodies on a tube are relatively long and prone to damage. In addition, the inductance of a coil is relatively high, which makes the magnets slow. Furthermore, the inductance depends on the stroke. This variable inductance can lead to stability problems in control loop applications. Therefore, bidirectional electromagnetic actuators with double acting force have been developed. The advantage of this is that in an emergency, in case of power failure, the valve falls back into a fail-safe location.
Es ist Aufgabe der vorliegenden Erfindung einen doppeltwirkenden elektromagnetischen Aktor in der eingangs genannten Art zu schaffen, der einfach und kostengünstig aufgebaut ist und zuverlässig arbeitet.It is an object of the present invention to provide a double-acting electromagnetic actuator in the aforementioned type, which is simple and inexpensive and reliable.
Erfindungsgemäß wird die Aufgabe durch einen Aktor gemäß Anspruch 1 gelöst. Der Anker ist in einem Polrohr angeordnet, insbesondere gelagert, das in der Spule vorgesehen ist. Das Polrohr schafft einen Bewegungsraum, in dem der Anker zuverlässig arbeiten kann. Das Polrohr hat die Aufgabe, den Anker beziehungsweise die Ankerstange aufzunehmen. Es bildet damit auch eine Anschlußmöglichkeit des erfindungsgemäßen Aktors an das zu beeinflussende Element, zum Beispiel eine Stellanordnung, ein Ventil oder dergleichen. Es ist auch grundsätzlich möglich, hier einen entsprechend dichten Anschluß zu realisieren,
wobei das bevorzugt einstückig ausgebildete Polrohr die empfindliche Elektronik, nämlich insbesondere den Spulenkörper und die Wicklung, schützt, da das Medium gegebenenfalls in den Polraum gelangen kann, der aber gegenüber der Spule dicht ist. Der Polraum hat des Weiteren die Aufgabe
gegebenenfalls eine Lagerung des Ankers zur Verfügung zu stellen. Da der Anker auf der Ankerstange angeordnet ist, erfolgt eine Lagerung des Ankers gegebenenfalls auch mittelbar (ebenfalls erfindungsgemäß) über die Ankerstange, die in entsprechenden Lagern im Polraum gelagert ist. Es ist aber auch möglich, eine eigene Lagerung der Ankerstange, zum Beispiel durch eine entsprechende Gleitlagerung, zu realisieren. Hierdurch wird ein zuverlässiger Betrieb des Aktors sichergestellt, wobei bei der Ausgestaltung des Aktors bevorzugt auf Bauteile, wie sie zum Beispiel im Bereich der Elektromagnetfertigung bekannt sind, zurückgegriffen werden kann, wodurch sich auch eine kostengünstige Realisierung der Erfindung ergibt.According to the invention the object is achieved by an actuator according to
wherein the preferably integrally formed pole tube protects the sensitive electronics, namely in particular the bobbin and the winding, since the medium may optionally enter the pole space, but which is sealed to the coil. The Polraum also has the task
optionally to provide a storage of the anchor available. Since the armature is arranged on the anchor rod, the armature is possibly also indirectly (likewise according to the invention) via the anchor rod, which is mounted in corresponding bearings in the pole space. But it is also possible to realize a separate storage of the anchor rod, for example by a corresponding sliding bearing. In this way, a reliable operation of the actuator is ensured, wherein in the configuration of the actuator preferably on components, as they are known, for example, in the field of electromagnetic production, can be used, resulting in a cost-effective implementation of the invention.
In einer bevorzugten Variante der Erfindung ist vorgesehen, daß das Polrohr druckdicht ausgeführt ist. In diesem Fall ist es möglich, daß der Polraum, welcher den Anker aufnimmt, auch Teil des Medienkreislaufes sein kann, der durch den Aktor zu beeinflussen ist. Durch die druckdichte Ausgestaltung wird erreicht, daß natürlich auch unter Druck kein Mediumverlust im Aktor erfolgt und zum anderen wird auch sichergestellt, daß kein unter Umständen aggressives Medium die stromleitenden Bereiche oder andere Bereiche des Aktors angreifen kann.In a preferred variant of the invention it is provided that the pole tube is designed pressure-tight. In this case, it is possible that the pole space accommodating the armature may also be part of the medium circuit which is to be influenced by the actuator. Due to the pressure-tight design is achieved that, of course, no loss of media in the actuator under pressure and on the other hand it is also ensured that no aggressive medium under certain circumstances can attack the current-conducting areas or other areas of the actuator.
Im Zusammenhang mit dem erfindungsgemäßen doppeltwirkenden Aktor beziehungsweise elektromagnetischen Aktor ist zu bemerken, daß die Funktionsweise des Aktors von der Ausgestaltung des schwach- beziehungsweise nichtmagnetischen Bereiches im Verhältnis zu dem stärker beziehungsweise leicht magnetisierbaren Bereich abhängt. Im weiteren Verlauf wird daher der grundsätzlich stärker magnetisierbare Bereich als "magnetisierbarer Bereich" beschrieben und der schwach- beziehungsweise nichtmagnetische Bereich grundsätzlich als "nichtmagnetischer Bereich", ohne dabei die Erfindung auf genau diesen speziellen Anwendungsfall, insbesondere des nichtmagnetischen Bereiches, reduzieren zu wollen. Es ist klar, daß es gemäß der Erfindung darauf ankommt, daß die Magnetisierung im schwach- beziehungsweise nichtmagnetischen Bereich in jedem Fall geringer ist, wie in dem stärker beziehungsweise leicht magnetisierbaren Bereich, um erfindungsgemäß zu wirken.In connection with the double-acting actuator or electromagnetic actuator according to the invention, it should be noted that the mode of operation of the actuator depends on the design of the weak or nonmagnetic region in relation to the more or slightly magnetizable region. In the further course, therefore, the basically more magnetizable region is described as a "magnetizable region" and the weak or nonmagnetic region is fundamentally intended as a "nonmagnetic region", without wishing to reduce the invention to precisely this specific application, in particular of the nonmagnetic region. It is clear that it is according to the invention What matters is that the magnetization in the weak or non-magnetic region in each case is less, as in the stronger or slightly magnetizable region to act according to the invention.
Das Polrohr führt zudem zu einer Verstärkung des von der Spule erzeugten Magnetfelds, wenn das Polrohr vorzugsweise aus einem magnetisierbaren Werkstoff hergestellt ist. Die erzeugte Magnetfeldkraft ist ungefähr proportional zum Eingangsstrom.The pole tube also leads to an amplification of the magnetic field generated by the coil, when the pole tube is preferably made of a magnetizable material. The generated magnetic field force is approximately proportional to the input current.
In einer bevorzugten Variante der Erfindung ist vorgesehen, daß das Polrohr die stärker beziehungsweise leicht magnetisierbaren Bereiche und den schwach- beziehungsweise nichtmagnetischen Bereich aufweist. Geschickterweise werden die verschiedenen Funktionen des Gerätes in den zur Verfügung stehenden Bauteilen integriert, um die Anzahl der Bauteile zu reduzieren. Neben der Aufgabe des Polrohres, eine Aufnahme für den Anker zu bilden, umfaßt das Polrohr somit auch die Aufgabe, den magnetisierbaren beziehungsweise nichtmagnetischen Bereich zur Verfügung zu stellen. Dabei ist natürlich zu beachten, daß die Erfindung auch Lösungen umfaßt, bei welchen das Polrohr die magnetischen Eigenschaften des Gerätes nicht beeinflußt und der magnetisierbare Bereich beziehungsweise nichtmagnetische Bereich durch zusätzliche Elemente, zum Beispiel eine Hülse oder einem Rohr, die innerhalb oder außerhalb des Polrohrs angeordnet sein mag, realisiert werden.In a preferred variant of the invention it is provided that the pole tube has the stronger or slightly magnetizable areas and the weak or non-magnetic area. Cleverly, the various functions of the device are integrated in the available components to reduce the number of components. In addition to the task of the pole tube to form a receptacle for the anchor, the pole tube thus also has the task of providing the magnetizable or non-magnetic region. It is of course to be noted that the invention also includes solutions in which the pole tube does not affect the magnetic properties of the device and the magnetizable region or non-magnetic region by additional elements, such as a sleeve or a tube disposed inside or outside of the pole tube be realized.
Erfindungsgemäß wird ein bezüglich einer Mittelebene der Spule symmetrischer Aufbau des Ankers vorgeschlagen. Als Mittelebene der Spule wird dabei eine zur Spulenachse senkrechte Ebene angesehen, die als Symmetrieebene der Spule dient. Durch eine solche Ausgestaltung wird erreicht, daß die Wirkweise des Aktors in beide Richtungen im Wesentlichen gleich ist.According to the invention, a symmetrical construction of the armature is proposed with respect to a center plane of the coil. As the center plane of the coil while a plane perpendicular to the coil axis is considered, which serves as a plane of symmetry of the coil. By such a configuration it is achieved that the mode of action of the actuator in both directions is substantially equal.
Ähnliches wird dadurch erreicht, daß eine bezüglich einer Mittelebene der Spule symmetrische Anordnung des starken beziehungsweise leicht magnetisierbaren Bereiches und des schwachbeziehungsweise nichtmagnetisierbaren Bereiches vorgesehen wird.The same is achieved in that one with respect to a median plane the coil is provided symmetrical arrangement of the strong or easily magnetizable region and the weakly or nichtmagnetisierbaren region.
Neben dieser grundsätzlich symmetrischen Ausgestaltung der Erfindung ist es aber auch möglich, ein bezüglich der Mittelebene der Spule asymmetrischen Aufbau des Ankers beziehungsweise Anordnung des stark beziehungsweise leicht magnetisierbaren Bereiches beziehungsweise schwach- beziehungsweise nichtmagnetischen Bereiches vorzusehen. In diesem Fall ist dann das Kennlinienverhalten und die beiden Hubrichtungen unterschiedlich, das Verhalten ist aber auch durch die spezielle Gestaltung der Begrenzungsflächen zwischen dem magnetisierbaren Bereich beziehungsweise nichtmagnetischen Bereich beeinflußbar und daher auch korrigierbar. Es ist daher zum Beispiel auch erreichbar, einen asymmetrischen Aktor in seiner Ausgestaltung bezüglich der Begrenzungsfläche so zu beeinflussen, daß er einen symmetrischen Kennlinienverlauf beziehungsweise den Verlauf der Kennlinien wie bei einem symmetrisch gestalteten Aktor besitzt.In addition to this fundamentally symmetrical embodiment of the invention, it is also possible to provide an asymmetrical with respect to the center plane of the coil structure of the armature or arrangement of the strong or easily magnetizable area or weak or non-magnetic area. In this case, then the characteristic behavior and the two stroke directions are different, but the behavior is also influenced by the special design of the boundary surfaces between the magnetizable region or non-magnetic region and therefore also correctable. It is therefore also achievable, for example, to influence an asymmetrical actuator in its configuration with respect to the boundary surface in such a way that it has a symmetrical characteristic curve or the course of the characteristic curves as in a symmetrically designed actuator.
Um den Anker mit angeordneten Permanentmagneten zu einem Polraum des Polrohrs in einer Mittelstellung als ausfallsichere Stellung zu halten beziehungsweise überführen zu können, ist zu diesem Polraum der schwach- beziehungsweise nichtmagnetische Bereich zentriert ausgebildet.In order to be able to hold or transfer the armature with arranged permanent magnets to a pole space of the pole tube in a middle position as a fail-safe position, the weak or non-magnetic region is centered on this pole space.
In einer Variante der Erfindung ist vorgesehen, daß der nichtmagnetische Bereich als Luftspalt ausgebildet ist. Zum Beispiel ist das Polrohr aus zwei Teilrohren gebildet, die entsprechend beabstandet sind, um den Luftspalt zu schaffen. Es ist aber auch möglich, ein separates Element, zum Beispiel eine entsprechende Hülse oder ein Rohr, welche/s den magnetisierbaren Bereich bildet, in zwei Teilelemente aufzuteilen und zu beabstanden, um, bei durchgehendem Polrohr, ebenfalls einen Luftspalt zu Bildung des nichtmagnetischen Bereichs zur Verfügung zu stellen.In a variant of the invention it is provided that the non-magnetic region is formed as an air gap. For example, the pole tube is formed of two sub-tubes, which are spaced appropriately to provide the air gap. But it is also possible, a separate element, for example a corresponding sleeve or a tube which / s forms the magnetizable region, in two sub-elements split and space to provide, with a continuous pole tube, also an air gap to form the non-magnetic region.
Günstig ist es aber, daß der nichtmagnetische Bereich aus Vollmaterial besteht, wodurch das Polrohr eine entsprechende mechanische Stabilität besitzt und auch einfacher zu montieren ist, da dieses dann in einem Bearbeitungsschritt entsprechend bearbeitet und ausgerichtet ist und eine separate Ausrichtung der beiden Teilrohre nicht notwendig ist. Der nichtmagnetische Bereich kann beispielsweise aus einem nichtmagnetisierbaren Metallwerkstoff hergestellt sein. Dies ist insbesondere von Vorteil, um den daran anknüpfenden, in axialer Richtung beidseitig angeordneten hülsen-beziehungsweise ring- oder rohrförmigen magnetischen Bereich beziehungsweise stärker magnetischen Bereich besser stoffschlüssig miteinander zu verbinden.It is favorable, however, that the non-magnetic region consists of solid material, whereby the pole tube has a corresponding mechanical stability and also easier to assemble, since this is then processed and aligned accordingly in a processing step and a separate alignment of the two sub-tubes is not necessary. The non-magnetic region may be made, for example, of a non-magnetizable metal material. This is particularly advantageous in order to better bond together the sleeve-shaped or ring-shaped or tubular magnetic region or stronger magnetic region which is connected thereto on both sides in the axial direction.
Bei besonders leichten Anwendungen oder bestimmten Anwendungen, bei denen beispielsweise der magnetische Bereich aus einem Kunststoffverbund hergestellt ist, kann der schwach- beziehungsweise nichtmagnetische Bereich aus einem nichtmagnetisierbaren Kunststoff beziehungsweise Kunststoffverbund hergestellt sein.For particularly light applications or specific applications in which, for example, the magnetic region is made from a plastic composite, the weak or non-magnetic region can be made of a non-magnetizable plastic or plastic composite.
Um einen besonders einfachen Aufbau des doppeltwirkenden elektromagnetischen Aktors bereitzustellen, ist das Polrohr mit dem schwach- beziehungsweise nichtmagnetischen Bereich bereits ausgebildet.In order to provide a particularly simple structure of the double-acting electromagnetic actuator, the pole tube with the weak or non-magnetic region is already formed.
Um besondere Magnetkraftkennlinien und magnetische Eigenschaften bei möglichst geringem Energieverbrauch an der Spule zu erzeugen, erstreckt sich der Polraum, in dem sich die Permanentmagneten befinden, lediglich über eine Hälfte der Spule hinaus. Die andere Hälfte ist vorzugsweise magnetisierbares Vollmaterial, das die magnetische Wirkung der Spule verstärkt. Dabei erstreckt sich gegebenenfalls der Polraum zu der zur Ankerstange abliegenden Seite über die Spule hinaus und wird dort durch einen Verschlußstopfen entsprechend verschlossen. Hieraus resultiert ein asymmetrischer Aufbau des Aktors. Es ist aber auch möglich, einen entsprechend symmetrischen Aufbau zu realisieren, bei welchem sich dann die Höhe des Polraumes nur ungefähr über die Hälfte der Höhe der Spule erstreckt und die ganze Anordnung bezüglich der Mittelebene symmetrisch ausgerichtet ist.In order to produce special magnetic force characteristics and magnetic properties with the lowest possible energy consumption at the coil, the pole space in which the permanent magnets are located extends beyond only one half of the coil. The other half is preferably magnetizable solid material which enhances the magnetic effect of the coil. In this case, if appropriate, the pole space extends beyond the coil to the side remote from the armature rod and is correspondingly closed there by a sealing plug. This results in an asymmetric structure of the actuator. But it is also possible to realize a correspondingly symmetrical structure, in which then the height of the pole space extends only approximately over half the height of the coil and the whole arrangement is aligned symmetrically with respect to the median plane.
Aufgrund einer derartigen Anordnung ist der nichtmagnetische Bereich im Polrohr in der Ruhestellung des Ankers in axialer Richtung ungefähr gegenüberliegend zur Zentralscheibe angeordnet. Eine solche Ausgestaltung führt dazu, daß auch bei einem stromlosen Zustand des Aktors (zum Beispiel bei Stromausfall) die Position des Ankers vorbestimmt ist und zum Beispiel für entsprechend sicherheitsrelevante Anwendungen das erfindungsgemäße Gerät verwendbar ist.Due to such an arrangement, the non-magnetic region in the pole tube in the rest position of the armature in the axial direction is arranged approximately opposite to the central disk. Such a configuration means that even with a de-energized state of the actuator (for example, in the event of power failure), the position of the armature is predetermined and, for example, the device according to the invention can be used for corresponding safety-relevant applications.
Die Permanentmagneten, die in axialer Richtung magnetisiert sind, sind auf dem Anker derart angeordnet, daß Polung bezüglich der Zentralscheibe symmetrisch ist. Somit wird eine doppeltwirkende Hubbewegung des Ankers erreicht, wobei der Anker sich, je nach Stromflußrichtung, in der Spule in die eine oder andere Richtung bewegt.The permanent magnets, which are magnetized in the axial direction, are arranged on the armature such that polarity is symmetrical with respect to the central disk. Thus, a double-acting lifting movement of the armature is achieved, wherein the armature moves, depending on Stromflußrichtung, in the coil in one or the other direction.
In einer bevorzugten Variante der erfindung ist vorgesehen, daß an den Stirnseiten der Permanentmagneten anschließend jeweils eine Scheibe angeordnet ist. Der Aufbau des Ankers nach der Erfindung ist von der herkömmlichen Ankergestaltung abgeleitet. Es folgt daher, daß der Permanentmagnet geschickterweise symmetrisch auf der bekannten Ausgestaltung eines Ankers eingebettet wird und sich auf der der Zentralscheibe abgewandten Seite des Permanentmagneten eine weitere Scheibe anschließt. Für ein möglichst symmetrisches Kennlinienverhalten ist es dabei günstig, daß natürlich auch der Anker einen entsprechend symmetrischen Aufbau aufweist, das heißt, daß die Dicken der außenliegenden Scheiben gleich sind. Auch die Dicken der beiden Permanentmagneten sind geschickterweise gleich. Die Dicke der Permanentmagneten kann aber natürlich unterschiedlich sein von der Dicke der außenliegenden Scheiben.In a preferred variant of the invention it is provided that subsequently a respective disk is arranged on the end faces of the permanent magnets. The structure of the armature according to the invention is derived from the conventional anchor design. It follows, therefore, that the permanent magnet is cleverly embedded symmetrically on the known configuration of an armature and on the side facing away from the central disc of the permanent magnet is followed by another disc. For as symmetrical a characteristic behavior as possible is favorable, that of course, the anchor has a correspondingly symmetrical structure, that is, that the thicknesses of the outer discs are the same. The thicknesses of the two permanent magnets are cleverly the same. Of course, the thickness of the permanent magnets may be different from the thickness of the outer discs.
Um die magnetischen Eigenschaften zu verbessern, so daß insbesondere kleinere Magneten eingesetzt werden können und der Aufbau insgesamt kostengünstiger ausfällt, ist die an die Permanentmagneten anschließende Scheibe mindestens eine ferromagnetische Polscheibe.In order to improve the magnetic properties, so that in particular smaller magnets can be used and the structure is more cost-effective overall, the disk adjoining the permanent magnets is at least one ferromagnetic pole disk.
Die Zentralscheibe zwischen den Permanentmagneten kann aus einem nichtmagnetischen beziehungsweise schwachmagnetischen Werkstoff oder bevorzugt, wie oben dargestellt, zur Verbesserung der magnetischen Eigenschaften aus einem ferromagnetischen Werkstoff hergestellt sein.The central disk between the permanent magnets may be made of a nonmagnetic or weakly magnetic material or preferably, as shown above, to improve the magnetic properties of a ferromagnetic material.
Um die Kraftkennlinie des Gerätes für bestimmte Anwendungen vorteilhaft zu modifizieren, also zu verändern, kann die Zentralscheibe einen größeren Durchmesser als die Polscheiben und die Permanentmagneten aufweisen. Für den kleineren Durchmesser des (abgestuften) Ankers ist der Innendurchmesser des Polrohrs an beiden Enden reduziert, in dem Standard-Lagerbuchsen, die aus ferromagnetischem Werkstoff hergestellt und mit einer entsprechenden Gleitbeschichtung ausgeführt sind, in den Polraum des Polrohrs eingeschoben sind. Die Permanentmagneten und die Polscheiben sind also jeweils in Lagerbuchsen geführt. Vorteilhafterweise ist die Zentralscheibe ungefähr so breit ausgebildet wie der nichtmagnetische Bereich.In order to advantageously modify the power characteristic of the device for certain applications, ie to change it, the central disk can have a larger diameter than the pole disks and the permanent magnets. For the smaller diameter of the (stepped) armature, the inner diameter of the pole tube is reduced at both ends, in which standard bearing bushes, which are made of ferromagnetic material and designed with a corresponding sliding coating, are inserted into the pole space of the pole tube. The permanent magnets and the pole disks are thus each guided in bearing bushes. Advantageously, the central disk is formed to be approximately as wide as the non-magnetic region.
Für einen einfachen und preiswerten Aufbau und Zusammenbau sowie eines verstärkten magnetischen Kraftfeldes, weist der Anker eine Ankerstange auf, auf der die Polscheiben, die Permanentmagneten und die Zentralscheibe angeordnet sind.For a simple and inexpensive construction and assembly as well as an amplified magnetic force field, the anchor has an anchor rod on which the pole discs, the permanent magnets and the central disk are arranged.
Da der doppelt wirkende elektromagnetische Aktor insbesondere für pneumatische oder hydraulische Anwendungen geschaffen wird, bei denen das Polrohr mit dem Fluid in Kontakt steht und das Polrohr insbesondere durckdicht ausgeführt ist, weist die Ankerstange zum Druckausgleich eine Durchgangsbohrung auf.Since the double-acting electromagnetic actuator is provided in particular for pneumatic or hydraulic applications in which the pole tube is in contact with the fluid and the pole tube is designed in particular durckdicht, the anchor rod for pressure equalization on a through hole.
In einer bevorzugten Variante der Erfindung ist vorgesehen, daß der magnetisierbare Bereich an einer Begrenzungsflächen an den nichtmagnetischen Bereich anschließt und sich die Dicke des magnetisierbaren Bereiches im Bereich der Begrenzungsfläche bezogen auf den (innenliegenden) Anker entweder von innen beginnend nach außen oder von außen beginnend nach innen verringert. Die hier beschriebenen Varianten sind insbesondere in
Bei einer besonderen alternativen Ausführungsform sind der schwach- beziehungsweise nichtmagnetische Bereich zwei in axialer Richtung, hintereinander angeordnete, schwach- nichtmagnetische Teilbereiche. In diesem Fall wirken sich nur die Außenkanten beziehungsweise Begrenzungsflächen dieser Bereiche auf die Kraftkennlinie aus und sind deshalb wiederum schräg und nicht glatt. Die Innenkanten beziehungsweise Innenbegrenzungsflächen der nichtmagnetischen Teilbereiche zum magnetischen Bereich können einfache, bevorzugt 45°, besonders bevorzugt gerade Winkelflächen haben.In a particular alternative embodiment, the weak or nonmagnetic region are two weakly nonmagnetic subregions arranged in axial direction one behind the other. In this case, only the outer edges or boundary surfaces of these areas affect the force characteristic and are therefore again oblique and not smooth. The inner edges or inner boundary surfaces of the nonmagnetic partial regions to the magnetic region can have simple, preferably 45 °, particularly preferably straight angled surfaces.
Um eine Kraftkennlinie in beiden Hubrichtungen möglichst gleichförmig zu erzielen, sind die schwach- beziehungsweise nichtmagnetischen Teilbereiche gleichförmig, bevorzugt im Wesentlichen spiegelbildlich identisch, ausgebildet. Eine vollständig asymmetrische Kraftkennlinie wird natürlich bevorzugt bei einem symmetrischen Aufbau des erfindungsgemäßen Aktors in einfacher Weise erreicht. Bei dem oftmals eingesetzten asymmetrischen Aufbau des Aktors wird trotzdem ein symmetrischer Kraftkennlinienverlauf beziehungsweise ein annähernd symmetrischer Kraftkennlinienverlauf erreicht, indem in geeigneter Weise durch die Anordnung beziehungsweise Ausgestaltung der Begrenzungsfläche Einfluß genommen wird. Gemäß der Erfindung ist es dabei gleichbedeutend, ob die Ausgestaltung der Begrenzungsfläche bezüglich einer Symmetrieebene symmetrisch ist oder hiervon abweichend. Die einzelnen Begrenzungsflächen können dabei auch unterschiedlich gestaltet sein, um entsprechende Kennlinienverläufe zu realisieren. Letztendlich bildet die Ausgestaltung der Begrenzungsfläche, ihre Orientierung und abschnittsweise Steigung einen weiteren Parameter, der in geeigneter Weise beeinflußt werden kann, um entsprechende Eigenschaften des Gerätes nach der Erfindung zu erreichen.In order to achieve a force characteristic as uniformly as possible in both stroke directions, the weakly or non-magnetic portions are uniform, preferably substantially mirror-inverted. Of course, a completely asymmetrical force characteristic is achieved in a simple manner in a symmetrical design of the actuator according to the invention. In the often used asymmetric structure of the actuator, a symmetrical force characteristic curve or an approximately symmetrical force characteristic curve is nevertheless achieved by influencing in a suitable manner by the arrangement or configuration of the boundary surface. According to the invention, it is synonymous, whether the configuration of the boundary surface is symmetrical with respect to a plane of symmetry or deviating therefrom. The individual boundary surfaces can also be designed differently in order to realize corresponding characteristic curves. Finally, the configuration of the boundary surface, its orientation and section-wise slope forms another parameter, which in suitable Mode can be influenced to achieve corresponding properties of the device according to the invention.
An dieser Stelle wird natürlich darauf hingewiesen, daß im Bereich der Begrenzungsfläche nicht nur von dem magnetisierbaren Material auf das nichtmagnetische Material gewechselt wird, gleiches kann aber auch dadurch erreicht werden, daß zum Beispiel in einer Verbundbauweise zunächst von einem magnetisierbaren Material auf ein zunächst weniger magnetisierbares Material gewechselt wird, was zum Beispiel einer Verringerung der Dicke des magnetisierbaren Materials entspräche, an dem sich dann der nichtmagnetische Bereich, wie beschrieben, anschließt. Bei der Erfindung kann also auch mit der Wahl des Materiales in diesem Bereich entsprechend gearbeitet werden, um die Eigenschaften des Gerätes einzustellen.Of course, it should be noted at this point that in the area of the boundary surface not only is the magnetizable material changed over to the non-magnetic material, but the same can also be achieved in that, for example, in a composite construction, initially from a magnetizable material to an initially less magnetizable one Material is changed, which would correspond, for example, a reduction in the thickness of the magnetizable material, which then followed by the non-magnetic region, as described. In the invention, it is therefore also possible to work with the choice of material in this area to adjust the properties of the device.
Bevorzugt ist der druckdichte Polraum, dessen eine Seite zum Einsetzen des Ankers dient, durch einen Verschlußstopfen abgedichtet. Dieser Verschlußstopfen kann aus einem nichtmagnetisierbarem Werkstoff hergestellt sein. Bevorzugt ist jedoch der Verschlußstopfen aus einem ferromagnetischem Werkstoff hergestellt, um das Magnetfeld positiv und verstärkend zu beeinflussen.Preferably, the pressure-tight pole space, one side of which serves for insertion of the armature, is sealed by a stopper. This plug can be made of a non-magnetizable material. Preferably, however, the plug is made of a ferromagnetic material to affect the magnetic field positive and reinforcing.
Natürlich kann der Verschlußstopfen auch verlängert hergestellt sein, um das magnetische Kraftfeld zu verändern.Of course, the plug can also be made longer to change the magnetic force field.
Bei einer bevorzugten weiteren Ausführungsform ist zumindest eine Polscheibe zum Verschlußstopfen hin verlängert ausgebildet und erstreckt sich insbesondere aus dem Körper der Spule heraus.In a preferred further embodiment, at least one pole disc is designed to extend towards the stopper and extends in particular out of the body of the coil.
Bei einer bevorzugten Ausführungsform, für hochleistungsfähige Magnete/Aktoren, bei denen magnetische Verluste auf ein Minimum reduziert sein müssen, sind Spule und Polrohr nicht separat sondern integriert ausgebildet.In a preferred embodiment, for high performance magnets / actuators where magnetic losses must be minimized, the coil and pole tube are not separate but integrated trained.
Bei einer bevorzugten alternativen Ausführungsform kann das Polrohr und der Verschlußstopfen jeweils Lager zur Führung der Ankerstange aufweisen. Somit ist sichergestellt, daß keine Reibung der Permanentmagneten oder Polscheiben beziehungsweise Zentralscheibe im zylinderförmigen Polraum auftritt.In a preferred alternative embodiment, the pole tube and the stopper may each have bearings for guiding the anchor rod. This ensures that no friction of the permanent magnets or pole disks or central disk occurs in the cylindrical pole space.
Ein erfindungsgemäßer doppeltwirkender Aktor weist eine druckdichte Gestaltung auf, die einen Arbeitshub, ähnlich wie bei herkömmlichen, einstufigen Magnetventilen hat. Existierende Magnetfertigungsverfahren können genutzt werden, wodurch eine kostengünstige Realisierung möglich ist. Der Anker gelangt in eine ausfallsichere Mittelstellung, wenn der Aktor nicht mit Strom beaufschlagt wird. Die Richtung der Kraft ist von der Richtung des Spulenstroms abhängig und über einen begrenzten Hub relativ unabhängig von der Position des Ankers. Der Aktor kann für alle elektromagnetischen Aktor-Anwendungen eingesetzt werden, die eine bidirektionale Kraft brauchen.An inventive double-acting actuator has a pressure-tight design, which has a working stroke, similar to conventional, single-stage solenoid valves. Existing magnetic production methods can be used, whereby a cost-effective implementation is possible. The armature enters a fail-safe center position when the actuator is not energized. The direction of the force is dependent on the direction of the coil current and, over a limited stroke, relatively independent of the position of the armature. The actuator can be used for all electromagnetic actuator applications that require a bidirectional force.
Es versteht sich, daß die vorstehend genannten und nachstehend noch zu erläuternden Merkmale nicht nur in der jeweiligen angegebenen Kombination, sondern auch in anderen Kombinationen denkbar sind.It is understood that the features mentioned above and below are not only conceivable in the respective combination indicated, but also in other combinations.
Die Erfindung wird im folgenden anhand von Ausführungsbeispielen, unter Bezugnahme auf dazugehörige Zeichnungen näher erläutert. Es zeigen:
- Fig. 1
- einen schematischen Querschnitt einer Seitenansicht eines erfindungsgemäßen doppeltwirkenden Aktors,
- Fig. 2
- einen schematischen Querschnitt einer Seitenansicht eines doppeltwirkenden Aktors mit abgestuften Anker,
- Fig. 3
- einen schematischen Querschnitt einer Seitenansicht eines erfindungsgemäßen doppeltwirkenden Aktors mit einer in Lagern geführten Ankerstange,
- Fig. 4
- einen schematischen Querschnitt einer Seitenansicht des erfindungsgemäßen doppeltwirkenden Aktors mit zwei nichtmagnetischen Teilbereichen,
- Fig. 5
- ein Kraftkennliniendiagramm eines elektromagnetischen Aktors gemäß
Fig. 1 und3 , - Fig. 6
- ein Kraftkennliniendiagramm eines elektromagnetischen Aktors gemäß
Fig. 4 , - Fig. 7
- ein Kraftkennliniendiagramm eines elektromagnetischen Aktors gemäß
Fig. 2 , - Fig. 8
- einen schematischen Querschnitt einer Seitenansicht eines erfindungsgemäßen Aktors in symmetrischem Aufbau und
- Fig. 9, 10
- jeweils in einer Vergrößerung ein Detail des erfindungsgemäßen Aktors.
- Fig. 1
- a schematic cross section of a side view of a double-acting actuator according to the invention,
- Fig. 2
- a schematic cross section a side view of a double-acting actuator with graduated armature,
- Fig. 3
- 3 shows a schematic cross-section of a side view of a double-acting actuator according to the invention with a bearing rod guided in bearings,
- Fig. 4
- 3 shows a schematic cross section of a side view of the double-acting actuator according to the invention with two non-magnetic partial regions,
- Fig. 5
- a force characteristic diagram of an electromagnetic actuator according to
Fig. 1 and3 . - Fig. 6
- a force characteristic diagram of an electromagnetic actuator according to
Fig. 4 . - Fig. 7
- a force characteristic diagram of an electromagnetic actuator according to
Fig. 2 . - Fig. 8
- a schematic cross section of a side view of an actuator according to the invention in a symmetrical structure and
- Fig. 9, 10th
- each in a magnification a detail of the invention Actuator.
Die
Der Anker 2 umfaßt eine Ankerstange 24, auf der im Bereich des Polrohrraums 16 zwei Permanentmagneten 22, 25 angeordnet sind. Zwischen den Permanentmagneten 22, 25 ist eine Zentralscheibe 23, bevorzugt aus ferromagnetischem Material angeordnet. Stirnseitig in axialer Richtung zu den Permanentmagneten ist jeweils eine aus ferromagnetischem Werkstoff hergestellte Polscheibe 21 beziehungsweise 26 angeordnet.The
Damit die Polscheiben 21, 26, die Permanentmagneten 22, 25 und die Zentralscheibe 23 möglichst reibungsfrei in dem zylinderförmigen Polrohrraum 16 gleiten können und die Ankerstange 24 des Ankers 2 führen können, sind die Innenflächen des Polrohrraums mit einer Folie, insbesondere einer PTFE(Polytetrafluorethylen)-Folie als Lager 60 überzogen. Um das Polrohr 10 befindet sich ein Magnetkörper 70 mit einer elektromagnetischen Spule 71. Der Polraum 16 erstreckt sich von der einen Stirnseite der Spule 71 bis etwa über die Hälfte der Spule 71.So that the
Um den Anker 2 innerhalb des Polraums 16 zu zentrieren, ist in der äußeren Umfangs- beziehungsweise Mantelfläche des ferromagnetischen Polrohrs 10 ein schwach- beziehungsweise nichtmagnetischer Bereich 8 vorgesehen. In dem hier gezeigten Ausführungsbeispiel besitzt das Polrohr 10 neben dem nichtmagnetischen Bereich 8 auch den magnetisierbaren Bereich 7. Zwischen dem magnetisierbaren Bereich 7 und dem nichtmagnetischen Bereich 8 ist eine Begrenzungsfläche 79 vorgesehen. Die Begrenzungsfläche 79 ist im Querschnitt der Seitenansicht gesehen schräg, zum äußeren Umfang radial nach außen zunehmend, insbesondere zu einer Parallelen der Bewegungsrichtung des Ankers 2 oder Spulenachse der Spule 71 konkav, nicht gerade und gegebenenfalls auch nicht glatt ausgebildet. Diese nicht geraden Begrenzungsflächen 79 beziehungsweise dieser nicht gerade Übergang führt zu einer Kraftkennlinie die nicht direkt vom Hub abhängt. Im Gegensatz zu einer Kraftkennlinie, deren Übergänge senkrecht, das heißt radial ausgebildet sind. Kanten dieser Übergänge wirken wie Polkerne. Der nichtmagnetische Bereich 8 teilt das Polrohr 10 somit in zwei Polkerne 11, 13. Die Permanentmagneten 22, 25 bilden somit jeweils ein geschlossenes Magnetfeld 72 und 73 mit jeweils einem Polkern 11, 13 des Polrohrs 10 für sich aus, das zum nichtmagnetischen Bereich 8 spiegelbildlich ist. Es versteht sich, daß das Magnetfeld 72 und 73 jeweils ringförmig zur Ankerachse angeordnet ist, wenn die Spule 21 nicht mit Strom beaufschlagt ist.In order to center the
Im Rahmen der Definition dieser Anmeldung wird unter einem magnetisierbaren Bereich 7 gemäß dem Anspruch ein stärker beziehungsweise leicht magnetisierbarer Bereich verstanden, dessen Magnetisierung in der Regel größer ist wie die Magnetisierung des nichtmagnetischen Bereiches 8, der gegebenenfalls schwach- beziehungsweise eben nichtmagnetisch ist.In the context of the definition of this application, a
Zum Druckausgleich weist die Ankerstange 24 eine Durchgangsbohrung 28 auf. Der Anker könnte alternativ auch durchgebohrt sein.For pressure equalization, the
Die
Die
Die
Die
Der nichtmagnetische Bereich 8, 82, 84 kann mittels verschiedenen Fertigungsverfahren produziert werden. Der Verschlußstopfen kann entweder aus ferromagnetischem oder nichtmagnetischem Stoff hergestellt sein. Die Permanentmagneten 22, 25 sind in der axialen Richtung magnetisiert und sind so angeordnet, daß jeweils gleiche Pole zu den Stirnseiten gerichtet sind und gleiche Pole zu gegenüberliegenden Flächen gerichtet sind. Im vorliegenden Beispiel sind die S-Pole zu den äußeren Stirnseiten des Ankers 2 gerichtet.The
Die
Die
Die
Mit dem elektromagnetischen doppeltwirkenden Aktor 1 kann somit eine flache Kennlinie mit einem Arbeitshub, ähnlich wie bei Standardmagneten, erzielt werden. Die Kraftkennlinie kann durch Polkerne (beziehungsweise Begrenzungsflächen 79) mit Mehrfachwinkeln optimiert werden. Dabei ist das druckdichte Polrohr 10 ähnlich wie bei Standardelektromagneten ausgebildet, so daß vorhandene Standardmagnetkörper eingesetzt werden können. Außerdem ist der elektromagnetische doppeltwirkende Aktor 1 für alle möglichen anderen Baugrößen anpassungsfähig.With the electromagnetic double-acting
Im Gegensatz zu der erfindungsgemäßen Variante nach
Das Polrohr 10 ist, ähnlich wie bei
Auf der rechten Seite wird der Luftspalt 17 begrenzt von der Anlagefläche 32 des Verschlußstopfens 30, der an das rechte, offene Ende des Polrohrs 10 eingesetzt ist und durch eine Verstemmung 31 oder Gewinde oder dergleichen druckfest gehalten ist. Zur Verbesserung der Dichheit ist eine Dichtung 40 vorgesehen.On the right side of the
Durch die spezielle Ausgestaltung der Polkerne 11, 13 ist die Kraftkennlinie entsprechend einstellbar. Die Polkerne 11, 13 sind die Bereiche des magnetisierbaren Bereiches 7, die sich an den nichtmagnetisierbaren Bereich 8 anschließen und insbesondere die Begrenzungsfläche 79 aufweisen. Gerade auf die Ausgestaltung der Polkerne 11, 13 im Bereich der Begrenzungsfläche 79 kommt es an, um die Kraftkennlinie entsprechend zu beeinflussen. Diese Situation ist vergrößert in
In Bezug auf die weitere Definition ist im Sinne der Anmeldung vorgesehen, daß sich die Ankerstange 24 innen befindet, da alle Elemente, die radial weiter von der Ankerstange 24 entfernt sind, entsprechend außen liegen.With respect to the further definition is provided in the sense of the application that the
In dem in
Hier entgegen zeigt
Insbesondere wird auf die zeichnerischen Darstellungen für die Erfindung als wesentlich verwiesen.In particular, reference is made to the drawings for the invention as essential.
Claims (16)
- Double action electromagnetic actuator (1), in particular for hydraulic and pneumatic applications, with a coil (71), an armature (2) arranged in the coil (71) with at least two permanent magnets (22, 25) magnetized in axial direction, and a central disc (23) between the permanent magnets (22, 25), wherein between armature (2) and coil (71) in axial direction areas (7) are provided that can be magnetized stronger or easily, and between these an area (8) forms that is weakly magnetic or non-magnetic, characterized in that in the coil (71) a pole tube (10) is arranged as part of the actuator, the armature (2) is mounted in the pole tube (10), and the pole tube (10) is provided with the areas (7) that can be magnetized stronger or easily and the weakly magnetic or non-magnetic area (8).
- Double action electromagnetic actuator according to claim 1, characterized in that the pole tube (10) is designed pressure sealed.
- Double action electromagnetic actuator according to one or both of the preceding claims, characterized in that the pole tube (10) is made from a magnetizable material.
- Double action electromagnetic actuator according to one or more of the preceding claims, characterized by a construction of the armature (2) symmetric with respect to a central plane of the coil (71), or a construction of the armature (2) asymmetric with respect to a center plane of the coil (71).
- Double action electromagnetic actuator according to one or more of the preceding claims, characterized by an arrangement of the strongly or easily magnetizable area (7) and of the weakly magnetic or non-magnetic area (8) symmetric with respect to a center plane of the coil (71), or an arrangement of the strongly or easily magnetizable area (7) and the weakly magnetic or non-magnetic area (8) asymmetric with respect to a center plane of the coil (71).
- Double action electromagnetic actuator according to one or more of the preceding claims, characterized in that the weakly magnetic or non-magnetic area (8) is configured centered to a pole space (16), or the non-magnetic area (8) is an air gap, and/or the non-magnetic area (8) is made from solid material.
- Double action electromagnetic actuator according to one or more of the preceding claims, characterized in that the non-magnetic area (8) is made from non-magnetizable metal material, and/or the non-magnetic area (8) is made is made from non-magnetizable synthetic material or synthetic composite material, and/or the pole tube (10) is formed with the weakly magnetic or non-magnetic area (8).
- Double action electromagnetic actuator according to one or more of the preceding claims, characterized in that a pole space (16) is provided extending over one half of the coil (71), and/or the non-magnetic area (8) in the pole tube (10) in inoperative position of the armature in axial direction is arranged about opposite the central disc (23).
- Double action electromagnetic actuator according to one or more of the preceding claims, characterized in that the polarization of the permanent magnets (22, 25) is symmetric with respect to the central disc (23), and/or each of the permanent magnets (22, 25) is connected to a disc (21, 26).
- Double action electromagnetic actuator according to one or more of the preceding claims, characterized in that connected to the front sides of the permanent magnets (22, 25) one disc (21, 26) each is arranged, in particular the disc (21, 26) in each case connected to the permanent magnets (22, 25) is at least a ferromagnetic pole disc, and/or the central disc (23) between the permanent magnets (22, 25) is made from a ferromagnetic material.
- Double action electromagnetic actuator according to one or more of the preceding claims, characterized in that the armature (2) has an armature rod (24) whereon the discs (21, 26), the permanent magnets (22, 25), and the central disc (23) are arranged, or the armature (2) has an armature rod (24) whereon the discs (21, 26), the permanent magnets (22, 25), and the central disc (23) are arranged, and the armature rod (24) has a passage boring (28) for pressure compensation, and/or a movement stroke of the permanent magnets (22, 25) lies within the coil (71).
- Double action electromagnetic actuator according to one or more of the preceding claims, characterized in that the weakly magnetic or non-magnetic area (8) consists of two weakly magnetic or non-magnetic partial areas (82, 84) arranged in axial direction one behind the other, or the weakly magnetic or non-magnetic area (8) consist of two weakly magnetic or non-magnetic partial areas (82, 84) arranged in axial direction one behind the other, and the weakly magnetic or non-magnetic partial areas (82, 84) are designed uniformly, preferably identically.
- Double action electromagnetic actuator according to one or more of the preceding claims, characterized in that the magnetizable area (7) is connected to a limiting surface (79) at the non-magnetic area (8), and the thickness of the magnetizable area (7) is reduced in the area of the limiting surface (79) on the armature either starting from inside to the outside or starting from outside to the inside.
- Double action electromagnetic actuator according to one or more of the preceding claims, if depending on claim 10, characterized in that the central disc (23) has a larger diameter than the pole discs (21, 26) and the permanent magnets (22), and/or the central disc (23) has the width of the non-magnetic area (8), or the central disc (23) is thicker than the non-magnetic area (8), and/or the permanent magnets (22) and the pole discs (21, 26) each are guided in bearing bushes (62).
- Double action electromagnetic actuator according to one or more of the preceding claims, if depending on claims 2 and 6, characterized in that the pressure sealed pole tube space (16) is sealed by a sealing plug (30), or the pressure sealed pole tube space (16) is sealed by a sealing plug (30) and the sealing plug (30) is made either from ferromagnetic material or is designed elongated or is made from non-magnetizable material.
- Double action electromagnetic actuator according to claims 15 and 10, characterized in that the pole tube (10) and the sealing plug (30) have bearings (9) for guiding the armature rod (24), and/or one of the pole discs (26) is designed elongated towards the sealing plug (30), in particular outside the coil form (71), and/or the coil (71) and the pole tube (10) are designed integrated.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007005434A DE102007005434A1 (en) | 2007-01-30 | 2007-01-30 | Double acting electromagnetic actuator for hydraulic and pneumatic applications, has anchor arranged in coil with two permanent magnets in axial direction and anchor is supported in pole tube arranged in coil |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1953773A2 EP1953773A2 (en) | 2008-08-06 |
EP1953773A3 EP1953773A3 (en) | 2013-08-21 |
EP1953773B1 true EP1953773B1 (en) | 2017-03-01 |
Family
ID=39271176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08001443.4A Active EP1953773B1 (en) | 2007-01-30 | 2008-01-25 | Double action electromagnetic actuator |
Country Status (3)
Country | Link |
---|---|
US (1) | US20080180200A1 (en) |
EP (1) | EP1953773B1 (en) |
DE (1) | DE102007005434A1 (en) |
Families Citing this family (22)
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DE102007041969C5 (en) * | 2007-09-03 | 2010-09-30 | Siemens Ag | Magnetic drive system for a switching device |
DE102008008761A1 (en) * | 2008-02-12 | 2009-08-13 | Robert Bosch Gmbh | actuating magnet |
JP5442980B2 (en) * | 2008-11-06 | 2014-03-19 | カヤバ工業株式会社 | solenoid |
DE102009060406B4 (en) | 2008-12-23 | 2018-07-19 | Svm Schultz Verwaltungs-Gmbh & Co. Kg | Pole tube of an electromagnet |
DE102009006355A1 (en) * | 2009-01-28 | 2010-07-29 | Schaeffler Technologies Gmbh & Co. Kg | Proportional magnet for a hydraulic directional valve and method for its production |
DE102009041604A1 (en) * | 2009-09-17 | 2011-03-24 | Svm Schultz Verwaltungs-Gmbh & Co. Kg | electromagnet |
US8740113B2 (en) * | 2010-02-10 | 2014-06-03 | Tenneco Automotive Operating Company, Inc. | Pressure swirl flow injector with reduced flow variability and return flow |
US8973895B2 (en) | 2010-02-10 | 2015-03-10 | Tenneco Automotive Operating Company Inc. | Electromagnetically controlled injector having flux bridge and flux break |
US9683472B2 (en) | 2010-02-10 | 2017-06-20 | Tenneco Automotive Operating Company Inc. | Electromagnetically controlled injector having flux bridge and flux break |
BR112012019877A2 (en) * | 2010-02-10 | 2016-04-26 | Tenneco Automotive Operating | pressure swirl flow injector with reduced flow variability and return flow |
DE202011052220U1 (en) * | 2011-12-07 | 2013-03-11 | Eto Magnetic Gmbh | Bistable electromagnetic actuator and camshaft actuator |
US8978364B2 (en) | 2012-05-07 | 2015-03-17 | Tenneco Automotive Operating Company Inc. | Reagent injector |
US8910884B2 (en) | 2012-05-10 | 2014-12-16 | Tenneco Automotive Operating Company Inc. | Coaxial flow injector |
ITRE20130017A1 (en) * | 2013-03-13 | 2014-09-14 | Tecnoil Srl | ELECTROMAGNETIC VALVE |
DE102013010833A1 (en) * | 2013-06-28 | 2014-12-31 | Hydac Electronic Gmbh | Electromagnetic actuator |
DE102014200647A1 (en) * | 2014-01-16 | 2015-07-16 | Zf Friedrichshafen Ag | Electromagnetic and dynamic actuator for active unit bearings |
DE102014200648A1 (en) * | 2014-01-16 | 2015-07-16 | Zf Friedrichshafen Ag | Electromagnetic and dynamic actuator for active unit bearings |
CN109312875B (en) * | 2016-06-28 | 2022-04-05 | 博格华纳公司 | Solenoid with inverted conical armature for solenoid actuated valve |
DE102017120627A1 (en) | 2017-09-07 | 2019-03-07 | Rausch & Pausch Gmbh | Method for producing a magnet armature-plunger assembly and armature-plunger assembly for a linear actuator |
DE102017120804A1 (en) * | 2017-09-08 | 2019-03-14 | Eto Magnetic Gmbh | Magnetaktorvorrichtung |
JP7393125B2 (en) * | 2018-03-13 | 2023-12-06 | フスコ オートモーティブ ホールディングス エル・エル・シー | Bistable solenoid with intermediate states |
US10704444B2 (en) | 2018-08-21 | 2020-07-07 | Tenneco Automotive Operating Company Inc. | Injector fluid filter with upper and lower lip seal |
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US3149255A (en) * | 1962-03-23 | 1964-09-15 | H & T Electrical Products | Electrical reciprocating motor |
US4264154A (en) * | 1979-06-05 | 1981-04-28 | Polaroid Corporation | Apparatus for automatically controlling transmission of light through a lens system |
JPS5829754U (en) * | 1981-08-21 | 1983-02-26 | 日立金属株式会社 | Actuator for door lock |
DE3527174A1 (en) * | 1985-07-30 | 1987-02-12 | Bosch Gmbh Robert | DOUBLE ACTING SOLENOID VALVE |
DE4217871A1 (en) * | 1992-05-29 | 1993-12-02 | Thomas Magnete Gmbh | Electromagnet with armature provided with a rod |
US5434549A (en) * | 1992-07-20 | 1995-07-18 | Tdk Corporation | Moving magnet-type actuator |
DE19952800A1 (en) * | 1999-02-22 | 2000-08-24 | Mannesmann Rexroth Ag | Magnetic pole for actuating magnet e.g. for hydraulic magnetic valve, has movable initial surface for control piston spring near pole base with adjustment device enabling adjustment of initial surface from outside pole |
US6422533B1 (en) * | 1999-07-09 | 2002-07-23 | Parker-Hannifin Corporation | High force solenoid valve and method of improved solenoid valve performance |
DE19958888A1 (en) * | 1999-12-07 | 2001-06-13 | Sheng Chih Sheng | Bidirectional electro magnetic linear actuator for valve, has armature located in exciting coil with permanent magnets for providing holding force at end sections |
-
2007
- 2007-01-30 DE DE102007005434A patent/DE102007005434A1/en not_active Withdrawn
-
2008
- 2008-01-25 EP EP08001443.4A patent/EP1953773B1/en active Active
- 2008-01-30 US US12/010,802 patent/US20080180200A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
US20080180200A1 (en) | 2008-07-31 |
EP1953773A3 (en) | 2013-08-21 |
EP1953773A2 (en) | 2008-08-06 |
DE102007005434A1 (en) | 2008-07-31 |
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