EP1334492A1

EP1334492A1 - Actuator that functions by means of a movable coil arrangement

Info

Publication number: EP1334492A1
Application number: EP01996866A
Authority: EP
Inventors: Hartmuth Rausch; Peter-Klaus Budig; Ralf Werner
Original assignee: Elektrische Automatisierungs- und Antriebstechnik EAAT GmbH
Current assignee: Elektrische Automatisierungs- und Antriebstechnik EAAT GmbH
Priority date: 2000-11-14
Filing date: 2001-11-14
Publication date: 2003-08-13
Also published as: CA2441997A1; KR20030064410A; CN1486496A; JP4052384B2; KR100840842B1; AU2002217028A1; US7164336B2; EP1334493B1; WO2002041331A1; ATE357731T1; DE50112241D1; WO2002041332A1; US20040003849A1; JP2004514393A; EP1334493A1; US6975195B2; US20040051607A1; CN1225751C; CA2441997C

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 characterized in that the dimensions of the permanent magnet and the pole disk correspond to each other in such a way that the diameter of the front surface of the permanent magnet is at least the same size as the circumferential surface of a neighboring pole disk and that the width of the coil associated with the pole disk exceeds the width of the pole disk by the lift amplitude of the coil support. According to the invention, the actuator for actuating a valve used in fluidic engineering is disposed in such a way that the coil support is displaceable in a fluidic medium and the air gap arranged between the coil support and a magnetic cylinder pipe surrounding the permanent magnet and the associated pole disk has a maximum width whereby a laminated lubricating film is formed without displacing the surrounding fluid.

Description

Actuator working by means of a movable coil arrangement

Description

The invention relates to an actuator with a housing jacket made of magnetically conductive material, a coil carrier movable in the housing jacket with the formation of an air gap therefor, with at least one coil through which current flows through its circumference, and with a magnet cylinder enclosed by the coil carrier with the formation of an air gap in the interior of which there is an axially arranged sequence of a permanent magnet and a pole disk made of a magnetically conductive material, the axial width of the coil being greater than the axial length of the pole disk assigned to the coil.

An actuator with the aforementioned features is described in US 5 345 206. The known actuator consists of a housing which is closed on one side and consists entirely of a magnetically conductive material, in which the coil carrier, which can be moved out of the housing with an actuating projection, can be moved. The known actuator is characterized in that the pole disks are narrow compared to the adjacent permanent magnets and the coils wound on the coil carrier have a much larger width than the associated narrow pole disks. With this configuration, a stray field acting on the coils overlapping the permanent magnets by the permanent magnets is to be deliberately generated in the known actuator due to magnetic saturation of the narrow pole disks. The disadvantage is accepted that the magnetic flux provided by the permanent magnet cannot be fully converted into a useful flow that causes the movement of the coil carrier and the field lines have to cover a large distance in the air gap next to the pole areas, for which one larger amount of magnetic material is required. Since the coils are designed with a dimension that largely overlaps the width of the associated pole disk to detect the leakage flux, there is a relatively large amount of coil material on the coil carrier. This disadvantageously not only increases the mass of the coil carrier to be moved during the function of the actuator, but rather the energization of a coil formed with a corresponding winding mass also leads to a correspondingly strong heating of the coil. This heating stresses the heat balance of the actuator and also leads to a corresponding expansion behavior of the individual coil former with a consequent influence on the dimension of the intended air gap and a limitation of the maximum possible energy density.

These disadvantages mean that a known actuator cannot be used for use in a fluid-filled room, and the object of the invention is therefore to set up an actuator with the features mentioned at the outset for use in fluid technology.

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Housing jacket is guided so that all coil conductors are subjected to the maximum air gap induction. So that this is ensured during the entire axial movement of the coil carrier relative to the fixed magnetic cylinder tube, it is provided according to the invention that the width of the coil assigned to the pole disk overlaps the width of the pole disk by the stroke amplitude of the coil carrier. Insofar as this limits the expansion of the coils to the necessary extent, an arrangement of coils with the smallest possible self-inductance and a low winding weight advantageously results.

Insofar as the size of the air gap between the coil carrier and the magnetic cylinder tube is also decisive for the stray flux to be avoided according to the invention, the invention provides for the smallest possible air gap to be set by the air gap existing between the coil carrier movable in the fluidic medium and the magnetic cylinder tube being maximally so It is broad that there is a laminar lubricating film between the parts without displacing the surrounding fluid. On the one hand, the aspect of the use of the actuator in fluid technology is taken into account in a special way, because a kind of sliding bearing of the coil carrier on the magnetic cylinder tube occurs with the least possible frictional losses, the displacement of the fluid surrounding the coil carrier caused by the axial movement of the coil carrier in the fluid on the outside of the bobbin. Here, when using an actuator according to the invention, for example in the direct control of intake or exhaust valves in internal combustion engines, the surrounding area is ensured CD m co I

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Housing is closed by a flexible membrane and the plunger works against the membrane.

Alternatively, it can be provided that the housing jacket is part of a housing that is open on one side and accommodates the movable coil support and the magnetic cylinder tube, and that the open end face of the housing is closed by a flexible membrane, and that the coil support is provided on the associated end face with a plate as a support star that works against the front membrane of the housing.

In a further embodiment of the invention, it can be provided that the housing jacket is part of a housing that is open on both sides and accommodates the movable coil carrier and the magnetic cylinder tube, and that both open end faces of the housing are closed off by a flexible membrane, and that the coil carrier on both ends with a plate as Support star provided and is designed as a reciprocating piston that works against the front membranes of the housing.

Insofar as the housing of the actuator is closed by one or two membranes and the medium to be pumped is acted upon by the moving membranes, it can be provided for separating the fluid required for the operation of the actuator from the medium to be pumped that the housing shell and the front Membranes formed interior of the housing is filled with water.

To the extent that an undesirable leakage flux occurs in particular on the permanent magnet adjacent to the front wall of the housing facing away from the support star of the coil carrier or on the pole disk, one is completely off existing conductive material provided that a spacer made of a magnetically non-conductive material is arranged between the end of the magnetic cylinder tube and the end wall of the housing. Alternatively, it can be provided that the end wall of the housing consists of a magnetically non-conductive material.

With regard to a basic design of coil carrier and magnetic cylinder, the invention provides a magnet module which is formed by a permanent magnet arranged in the center of the magnetic cylinder and by two pole disks arranged on the outside, with a partial coil being assigned to each pole disk on the coil carrier, the partial coils of a magnet module wound in opposite directions and mechanically and electrically connected to each other, so that a mutual induction is avoided.

According to one embodiment of the invention, it is provided that a single magnet module is arranged within the housing shell of the actuator. Due to the compact, symmetrical structure of the magnet module associated therewith, due to the relatively low magnetic scattering losses according to the invention, a relatively greater force density is generated which, in conjunction with a low inertia of the coil carrier including coils wound thereon, permits rapid alternating movements or rapid one-sided deflection of the coil carrier. The self-inductances of the partial coils are kept low, so that current changes are so rapid that, for example, stroke adjustments over a few millimeters can be achieved in a few milliseconds. Insofar as there are only short axial magnet lengths due to the dimensional relationships according to the invention for the size ratio of permanent magnet and pole disk on the one hand and pole disk and coil winding on the other hand, in particular in the case of a desired small size of the actuator according to the invention, depending on the intended use, the induction emanating from a single permanent magnet for the desired movement of the The bobbin is not sufficient. It is therefore provided according to an embodiment of the invention that a plurality of magnet modules are arranged axially one behind the other within the housing shell, axially identical poles of the permanent magnet of each magnet module being opposite one another. It can be provided here that the outer pole disks of each magnet module are joined to form a one-piece connecting pole disk.

Insofar as there is a loss of scatter in the case of an alternating arrangement of permanent magnet and pole disk in the magnetic cylinder tube in the region of pole disks located at the outer ends, since the magnetic flux in the pole disk from the inner permanent magnet is not completely deflected in the direction of the coil covering the pole disk According to an embodiment of the invention, it is provided that at the ends of the magnetic cylinder tube formed by the outer pole disks of the magnetic module or the magnetic modules, an edge magnet with a thickness matched to the compensation of the magnetic stray flux occurring at the ends of the magnetic cylinder tube is arranged and with the magnetically conductive material existing housing shell is connected, so that the of the edge magnet

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for example, has a protrusion in the form of a hump or line, so that surface friction is avoided and only point or line friction is permitted. Accordingly, a projection can also be formed on a spoke and rest against the claw pole.

Furthermore, there is advantageously the possibility that a claw pole and / or the magnetic cylinder clamped between the claw pole and the housing or between the claw poles on both sides or the magnetic cylinder tube form a fixed holder for the sensor of a displacement measuring system with respect to the housing, so that the measurement results of the Measuring system distorting movements of the sensor carrier are excluded.

According to one exemplary embodiment of the invention, the construction of a magnet module or of a plurality of magnet modules can also be such that a magnet module is formed by a pole disc arranged in the center of the magnet cylinder tube and by two permanent magnets arranged on the outside, with axially identical poles of the permanent magnets opposing and on each other the coil carrier is wound with a coil assigned to the centrally arranged pole disk. This is associated with the advantage that the permanent magnets arranged on the outer ends of the magnetic cylinder tube simultaneously act as edge magnets and thus allow the magnetic cylinder tube to be fixed directly between the claw poles and the housing or between the claw poles arranged on both sides of the housing. In comparison with an additional arrangement of edge magnets, this arrangement also offers the advantageous possibility of

BESTATIGUNGSKOPIE reduce the number of magnets with the same force effect. According to an embodiment of the invention, a plurality of alternating pole disks and permanent magnets can also be arranged between two external permanent magnets.

According to one embodiment of the invention, it can be provided that a prestressed spring for acting on the plunger in its coupling position with a valve connected to the actuator is arranged between the support star of the coil carrier and the front end of the magnetic cylinder tube.

With regard to the design of the coil carrier including coils wound thereon, it can be provided that the coil carrier consisting of electrically non-conductive material, for example made of plastic, hard tissue or ceramic, has recesses for receiving the coils, into which the individual coils are wound. Furthermore, it can be provided according to an embodiment of the invention that the coils wound in the recesses of the coil carrier are overlaid by a protective layer, so that the coil carrier provided with coils each has a smooth surface. With such a configuration of the coil carrier, very small air gaps between the coil carrier and the magnetic cylinder tube on the one hand and the housing jacket on the other hand can be realized.

Finally, according to one embodiment of the invention, it can be provided that grooves running on the inside of the housing shell in the longitudinal direction thereof are arranged for the passage of the fluid displaced in the housing jacket when the coil carrier is moved axially; in this way, a small air gap can be realized between the coil carrier and the housing jacket despite the displacement required in the fluid surrounding it when the coil carrier is moved. Corresponding grooves can optionally also be provided on the outer circumference of the coil carrier.

In the drawing, exemplary embodiments of the invention are shown, which are described below. Show it:

Fig. 1 shows an actuator with a central

Permanent magnets and external pole disks existing magnetic module in a schematic longitudinal section,

2 shows an actuator constructed in accordance with FIG. 1 with a plurality of magnet modules,

3 shows an actuator according to FIG. 1 with additionally arranged edge magnets in longitudinal section,

4 shows a section along line IV-IV in FIG. 3,

5 shows the subject of FIG. 3 with an arrangement of several magnetic modules,

6 shows an embodiment of the actuator according to FIG. 3 with a housing open on both sides and correspondingly arranged claw poles and with a central pole disc and external main magnets,

7 shows the subject of FIG. 6 with an arrangement of several main magnets and pole disks,

Fig. 8 is a sectional view of a coil carrier in section.

The actuator shown in FIG. 1 in a schematic representation has a housing 10, the outer housing shell 11 of which is made of a magnetically conductive material. For reasons to be explained, one closed end face 12 of the housing 10 consists of another, namely a magnetically non-conductive material, while the opposite end face 13 consists of magnetically conductive material and has a central recess 14.

A cylindrical magnetic cylinder tube 15 is arranged in the interior of the housing 10 and is connected on one side to the closed end face 12 of the housing 10. The magnetic cylinder tube 15 consists of a magnetically non-conductive material. In ^"its interior is disposed in a central position, a permanent magnet 16, each having a pole disc located at the two end faces 17,. Between the closed end 12 of the housing 10 adjacent pole plate 17 and the aforesaid face 12 is in addition a spacer 18 made of a magnetically arranged non-conductive material, which has the purpose, in view of the geometrical definition of the size ratios of

BESTATIGUNGSKOPIE To create permanent magnet 16 and pole disc 17 for sufficient freedom of movement of the coil carrier to be explained.

In the annular space existing between the magnetic cylinder tube 15 and the outer housing jacket 11, a sleeve-shaped coil carrier 19 made of a magnetically and electrically non-conductive material, for example made of plastic, hard tissue or ceramic, is arranged such that it can move axially, with an air gap 24 between the magnetic cylinder 15 and the coil carrier 19 and an air gap 25 is arranged between the coil carrier 19 and the outer housing shell 11. On the side facing away from the closed end face 12 of the housing, the coil carrier is provided with a support star 20 formed from radially inwardly jumping spokes 21, a plunger 22 projecting axially through the recess 14 of the end face 13 of the housing 10 being arranged in the center of the support star 20 and having the support star 20 is connected.

As only schematically arranged in FIG. 1 and shown somewhat more clearly in FIG. 8, two coils 23 made of a suitable material, preferably of copper or aluminum wire, are wound on the bobbin 19 in the embodiment shown in FIG. 1, the coils 23 in each case axially overlap the pole disks 17 and are wound in opposite directions to one another.

For the high dynamics required in the actuators according to the invention, it is essential, on the one hand, to design the coils 23 with the smallest possible self-inductance and low winding weight, and on the other hand to use the total of to lead the permanent magnet 16 outgoing magnetic flux as radially as possible in the area of the pole disks 17 through the air gap 24 existing between the magnet cylinder tube 15 and the coil support 19, so that the coils 23 located on the coil support 19 are subjected to the maximum air gap induction during the entire axial movement of the coil support , In order to keep the leakage flux that does not contribute to the generation of force as low as possible, short magnet lengths and small air gaps should be aimed for. For this reason, as can not be seen in the schematic illustration in FIG. 1, the size dimensions of permanent magnet 16 and pole disks 17 are matched to one another in such a way that the end cross-sectional area of the permanent magnet corresponds at least to the circumferential surface of the respective pole disk. This is shortened if the axial magnet length and the axial length of the pole disks 17 correspond to approximately half the diameter of the permanent magnet 16. Longer pole disks are quite possible within the scope of the inventive concept. Furthermore, each of the two coils 23 must overlap the width of the associated pole disk 17 by the stroke amplitude of the coil carrier 19, so that the greatest possible force is achieved during the entire course of movement of the coil carrier 19. The two coils 23 are axially spatially separated from one another by a non-conductive spacing area 30 of the coil carrier 19, but are electrically connected to one another via the winding wire. Since the two coils 23 are also wound in opposite directions, mutual inductance is avoided. To the extent that the air gap 24 existing between the magnetic cylinder tube 15 and the coil carrier 19 is to be kept small to avoid an unusable leakage flux, the air gap 24 should be dimensioned to a maximum that a laminar lubricating film is formed between the parts 15, 19 without displacement of the coil carrier 19 or adjusts the fluid surrounding the magnetic cylinder tube.

In the case of a construction of an actuator shown in FIG. 1 with a magnet module arranged in the housing 10 with the construction described, the permanent magnet 16 generates a radially from the inside to the outside in the entire air gap 24, 25 between the magnet cylinder tube 15 and the housing jacket 11 in the region of the coils 23 directed homogeneous magnetic field, which can close according to the direction of flow 31 via the magnetically conductive, annular housing shell 11. The coils 23 through which a direct current flows are deflected transversely to the magnetic field direction in a homogeneous magnetic field with a force proportional to the coil current, the magnetic air gap induction and the number of turns of the two coils 23. For this purpose, a current is supplied to the coils 23 arranged on the movable coil carrier 19 through highly flexible cables, not shown in detail. A deflection of the coil carrier 19 and thus an axial movement of the plunger 22 takes place as long as current-carrying conductors, ie the coils 23, are in the magnetic field. If the current is switched, the direction of movement of the coil carrier 19 also reverses, so that a reciprocating movement of the coil carrier 19 or of the plunger 22 carried by it results in accordance with arrow 32. Since the arrangement shown in Figure 1 is magnetic

To have an effect, they must be connected to the housing 10 made of magnetically conductive material, so that a corresponding magnetic flux can occur. This is achieved on the side of the magnetic cylinder tube 15 facing away from the tappet 22 in that the relevant end face 12 of the housing 10 and the correspondingly arranged spacer 18 now consist of a magnetically conductive material.

On the end face 13 opposite the end face 12, radially inwardly jumping magnetically conductive holders 27 with axially attached claw poles 28 are provided to form a magnetically conductive connection to the edge magnet 26 arranged there, the claw poles 28 between the spokes 21 of the support star 20 of the coil carrier 19 grip (Figure 4) and come into contact with the outer edge magnet 26 of the magnetic cylinder 15. The magnetically conductive holders 27 can also be designed, for example, as a circumferential disk connected to the housing jacket 11, from which claw poles start. Due to the magnetic forces that arise, the magnetic cylinder 15 is thus firmly connected to the end wall 12 of the housing 10 on the one hand and to the claw poles 28 forming part of the housing 10 on the other hand, so that there is a stable configuration which also withstands a greater force. For this reason, the claw poles 28 are particularly suitable for forming an anti-rotation device for the support star 20 of the coil carrier 19 with a plunger 22 or also for serving as a holder for the sensor of a position measuring system. As can be seen from FIG. 5, it is also possible in an exemplary embodiment of the actuator according to the invention shown in FIGS. 3 and 4 to carry out a sequence of permanent magnets 16 and pole disks 17 in the magnetic cylinder tube 15, corresponding edge magnets 26 being provided.

A further possibility of using the advantages of the actuator shown in FIGS. 3 and 4 is shown in FIG. 6, in which the housing 10 is designed to be open on both sides with claw poles 28 arranged on both sides, so that the coil carrier 19 is correspondingly provided on both end faces via a support star 20 can be provided with plungers 22 protruding from the housing 10 on both sides; this provides actuation of connected units in both directions of movement of the coil carrier 19 in the housing 10. Since the magnetic cylinder tube 15 is in turn firmly clamped over the claw poles 28 arranged on both sides of the housing, the magnetic cylinder tube 15 is held on both sides without the actuation on both sides being obstructed by the tappets 22 on both sides. Another difference between the exemplary embodiments shown in FIG. 6 and in FIGS. 3 and 5 is that a central pole disk 17 is arranged in the embodiment according to FIG. 6, on each side of which a permanent magnet 16 lies in the magnetic cylinder tube 15. These external permanent magnets 16 simultaneously take over the function of the edge magnets still provided in the exemplary embodiment according to FIGS. 3 and 5, so that these edge magnets can be dispensed with with the same force effect for the rest. This results in a Saving magnetic material. As can be seen from FIG. 7, such an arrangement can also be implemented with a sequence of several pole disks 17 and permanent magnets 16.

Finally, FIG. 8 shows an example of how a coil carrier 19 can be designed. In the exemplary embodiment shown, recesses 35 are recessed into the outer surface of the coil carrier 19, in which the coils 23 are wound, in order to accommodate the coils 23. The recesses 35 or coils 23 are then covered or cast with a protective layer 36, so that there is a correspondingly smooth outer circumference for the coil carrier 19, which enables the setting of small air gaps 24, 25.

The features of the subject matter of these documents disclosed in the above description, the patent claims, the abstract and the drawing can be essential both individually and in any combination with one another for realizing the invention in its various embodiments.

Claims

P a t e n t a n s r u c h e

Actuator with a housing jacket made of magnetically conductive material, a coil carrier movable in the housing jacket with the formation of an air gap for this purpose, with at least one coil through which current flows through its circumference, and with a magnet cylinder enclosed by the coil carrier with the formation of an air gap with an axial inside Arranged sequence of permanent magnet and pole disc made of a magnetically conductive material, the axial width of the coil being greater than the axial extent of the pole disc assigned to the coil, characterized in that the size dimensions of the permanent magnet (16) and pole disc (17) are matched to one another in this way are that the end cross-sectional area of the permanent magnet (16) corresponds at least to the circumferential surface of an adjacent pole disk (17) and that the width of the coil (23) assigned to the pole disk (17) corresponds to the width of the pole disk (17) overlaps the stroke amplitude of the coil carrier (19), and that the coil carrier (19) is movable in a fluid medium and that between the coil carrier (19) and one of the permanent magnets (16) and the associated pole disc (17) surrounding the magnetic cylinder tube (15) existing air gap (24) is dimensioned so wide that a laminar lubricating film is formed between the parts (15, 19) without displacement of the surrounding fluid.

2. Actuator according to claim 1, characterized in that the sleeve-shaped coil carrier (19) is provided on its one end face with a radially inwardly jumping spokes (21) having a supporting star (20).

3. Actuator according to claim 2, characterized in that in the center of the support star (20) from the housing

(10) above plunger (22) is connected as an actuation approach.

4. Actuator according to claim 3, characterized in that the housing jacket (11) is part of a closed and the movable coil carrier (19) and the magnetic cylinder tube (15) accommodating housing (10), the plunger (22) the associated end wall (13 ) of the housing (10) passes through in a recess (14).

5. Actuator according to claim 3, characterized in that the housing jacket (11) is part of an open on one side and the movable coil carrier (19) and the magnetic cylinder tube (15) accommodating housing (10), wherein _^ d-le. open end of the housing (10) is closed by a flexible membrane and the plunger (22) works against the membrane.

6. Actuator according to claim 2, characterized in that the housing jacket (11) is part of a one-sided is open and the movable coil support (19) and the magnetic cylinder tube (15) receiving housing (10) and the open end of the housing (10) is closed by a flexible membrane, and that the coil support is provided on the associated end face with a plate as a star is that works against the front membrane of the housing.

7. Actuator according to claim 2, characterized in that the housing jacket (11) is part of an open on both sides and the movable coil support (19) and the magnetic cylinder tube (15) receiving housing. (10) and both open end faces of the housing are closed by a flexible membrane and that the coil carrier (19) is provided on both end faces with a plate as a support star and is designed as a reciprocating piston which is against the front side membranes of the housing ( 10) works.

8. Actuator according to claim 6 or 7, characterized in that the interior of the housing (10) formed by the housing jacket (11) and end membranes is filled with water.

9. Actuator according to one of claims 2 to 8, characterized in that the support star (20) of the coil carrier (19) facing away from the end wall (12) of the housing (10) consists of magnetically conductive material and on the end wall (12) facing A spacer (18) made of a magnetically non-conductive material is arranged at the end of the magnetic cylinder tube (15).

10. Actuator according to one of claims 2 to 8, characterized in that the end wall (12) of the housing (10) consists of a magnetically non-conductive material.

11. Actuator according to one of claims 1 to 10, characterized in that a magnet module is formed by a permanent magnet (16) arranged centrally in the magnetic cylinder tube (15) and by two pole disks (17) arranged on the outside, each pole disk (17 ) on the bobbin

(19) is associated with a coil (23), the coils (23) of a magnetic module being wound in opposite directions and being mechanically and electrically connected to one another.

12. Actuator according to claim 11, characterized in that a magnet module is arranged within the housing shell (11).

13. Actuator according to claim 11, characterized in that a plurality of magnet modules are arranged axially one behind the other within the housing shell (11), with axially identical poles of the permanent magnet

(16) face each magnet module.

14. Actuator according to claim 13, characterized in that the outer pole disks (17) of each magnet module are joined together to form an integral connecting pole disk.

15. Actuator according to one of claims 1 to 14, characterized in that at the ends of the magnet cylinder tube formed by the outer pole disks (17) of the magnet module or the magnet modules

(15) each has an edge magnet (26) which is matched in its strength to the compensation of the magnetic stray flux occurring at the ends of the magnetic cylinder (15). arranged and connected to the housing jacket (11) made of magnetically conductive material.

16.Actuator with a housing jacket made of magnetically conductive material, a coil carrier movable in the housing jacket with the formation of an existing air gap, with at least one coil through which current flows through its circumference and with a magnet cylinder enclosed by the coil carrier with the formation of an air gap with a magnet cylinder in it Inner axially arranged sequence of permanent magnet and pole disc made of a magnetically conductive material, the axial width of the coil being greater than the axial extent of the pole disc assigned to the coil, characterized in that one from the center through the outer pole discs (17) between two external pole disks (17) arranged permanent magnets (16) of existing magnetic module or several magnetic modules formed ends of the magnetic cylinder each in its strength to compensate for the m occurring at the ends of the magnetic cylinder Agnetic leakage flux coordinated edge magnet (26) arranged and connected to the housing shell (11) consisting of magnetically conductive material.

17. Actuator according to claim 15 or 16, characterized in that in the case of a housing (10) which is open on one side in the region of the tappet (22), the inner edge magnet (26) of the magnetic cylinder tube (15) lying on the closed housing side is made of magnetically conductive material existing end wall (12) of the housing (10).

18. Actuator according to one of claims 15 to 17, characterized in that the housing (10) on its open end face (13) radially inwardly jumping and axially between the spokes (21) of the support star (20) of the coil carrier (19) claw poles (28) made of magnetically conductive material, which are in a magnetically adhesive connection with the associated edge magnet (26) of the magnetic cylinder tube (15).

19. Actuator according to one of claims 15 to 18, characterized in that the housing jacket (11) is open on both sides with claw poles (28) formed at its two ends and the coil carrier (19) movable in the housing jacket (11) on both ends each have a support star (20) with a plunger (22) projecting therefrom.

20. Actuator according to claim 18 or 19, characterized in that the claw poles (28) between the spokes (21) of the support star (20) are formed in accordance with the shape.

21. Actuator according to one of claims 18 to 20, characterized in that the claw poles (28) prevent rotation for the support star (20) with plunger

(22) form.

22. Actuator according to claim 21, characterized in that at least one claw pole (28) has a projection which bears against the associated spoke (21) of the supporting star (20).

23. Actuator according to claim 21, characterized in that at least one spoke (21) of the support star (20) has a projection abutting the associated claw pole (28).

24. Actuator according to one of claims 18 to 23, characterized in that a claw pole (28) and / or the magnetic cylinder tube (15) form a holder for the sensor of a displacement measuring system.

25. Actuator according to one of claims 18 to 24, characterized in that a magnet module of a pole disc arranged centrally in the magnetic cylinder tube (15)

(17) and is formed by two permanent magnets (16) arranged on the outside, the axially identical poles of the permanent magnets (16) opposing each other and a coil (23) associated with the centrally arranged pole disk (17) being wound on the coil carrier (19).

26. Actuator according to claim 25, characterized in that a sequence of alternately arranged between two external permanent magnets (16)

Pole discs (17) and permanent magnets (16) is arranged.

27. Actuator according to one of claims 18 to 26, characterized in that between the support star (20) of the coil carrier (19) and the front end of the magnetic cylinder tube (15) a prestressed spring for acting on the plunger (22) in its coupling position with the the actuator connected valve is arranged.

28. Actuator according to one of claims 1 to 27, characterized in that the coil carrier (1-9) Has recesses (35) for receiving the coils (23).

29. Actuator according to claim 28, characterized in that in the recesses (35) of the coil carrier

(19) wound coils (23) are overlaid by a protective layer (36) so that the coil carrier (19) provided with coils (23) has a smooth circumferential surface.

30. Actuator according to one of claims 1 to 29, characterized in that on the inside of the housing shell (11) extending in the longitudinal direction of the grooves for the passage of the axial movement of the coil carrier (19) in the housing shell

(11) displaced fluids are arranged.

Summary

An actuator with a magnet carrier that is movable in a magnetically conductive housing by induction of air gap on a coil cylinder that has a sequence of permanent magnet and pole disk is characterized in that the size dimensions of permanent magnet (16) and pole disk (17) are matched to one another in such a way that the end cross-sectional area of the permanent magnets

(16) corresponds at least to the circumferential surface of an adjacent pole disk (17) and that the width of the coil (23) assigned to the pole disk (17) overlaps the width of the pole disk (17) by the stroke amplitude of the coil carrier (19), and that the coil carrier ( 19) movable in a fluid medium and between the coil carrier

(19) and one surrounding the permanent magnet (16) and the associated pole disk (17)

Magnetic cylinder tube (15) existing air gap (24) is dimensioned so wide that a laminar lubricating film is formed between the parts (15, 19) without displacing the surrounding fluid.

BESTATIGUNGSKOPIE