WO2017211787A1

WO2017211787A1 - Electromagnetic actuating device having an armature-guiding assembly

Info

Publication number: WO2017211787A1
Application number: PCT/EP2017/063661
Authority: WO
Inventors: Martin Herrig; Alexander Steck; Holger Warner
Original assignee: Festo Ag & Co. Kg
Priority date: 2016-06-08
Filing date: 2017-06-06
Publication date: 2017-12-14
Also published as: DE102016210091A1; DE112017001425A5

Abstract

The invention relates to an electromagnetic actuating device (10), comprising: a coil (1); a yoke (2), having a core part (3) and a magnetic return part (4); an armature (5), which can be moved relative to the core part (3); a working air gap (6) formed between the core part (3) and the armature (5); and an armature-guiding assembly (7) for guiding the armature (5), wherein the magnetic return part (4), the armature-guiding assembly (7), the armature (5), the air gap (6), and the core part (3) form a magnetic circuit for a magnetic flux (8) produced by the coil (1). According to the invention, the armature-guiding assembly (7) comprises different guide segments (9; 11) and a first guide segment (9) located in the region of the working air gap (6) has lower magnetic permeability than a second guide segment (11) not located in the region of the working air gap (6).

Description

Electromagnetic actuator with armature guide assembly

The invention relates to an electromagnetic actuator, comprising a coil, a yoke having a core part and a return part, an armature movable relative to the core part, a working air gap formed between the core part and the armature and an armature guide arrangement for guiding the armature, wherein the return part, the armature guide arrangement in that the armature, the air gap and the core part form a magnetic circuit for a magnetic flux generated by the coil.

It is an object of the invention in the said electromagnetic actuator to efficiently provide the largest possible, acting on the anchor driving force.

This object is achieved by the features defined in the characterizing part of claim 1. According to the invention, it is provided that the armature guide arrangement comprises different guide segments and a first guide segment located in the region of the working air gap has a lower magnetic conductivity than a second guide segment not located in the region of the working air gap.

Since according to the invention the second guide segment has a higher magnetic conductivity than the first guide segment has, the magnetic flux can be coupled via the second guide segment particularly low loss in the armature, whereby a larger magnetic flux is achieved in the anchor. The larger magnetic flux, in turn, causes the drive force acting on the armature to be increased. At the same time characterized by the fact that the first guide segment has a lower magnetic conductivity, achieved that in the area of the working air gap as little or no share of the magnetic flux over the first guide segment flows from the armature to the core part. This ensures that as much of the magnetic flux as possible actually passes through the working air gap. This in turn favors the provision of a possibly very large driving force and thus enables the solution of the aforementioned object.

Advantageous embodiments of the invention are the subject of the dependent claims.

In a preferred embodiment, the guide segments are each formed as individual parts, the guide arrangement for forming the anchor preferably by joining, pressing, soldering, welding, and / or flanging are composed. In particular special designed as individual parts guide segments are made of materials with different magnetic conductivity. In this way it can be achieved, in particular, that the two guide segments differ greatly in their magnetic conductivity from each other.

Conveniently, the armature guide assembly and / or de anchor is configured such that the armature bears against the first guide segment and is guided by this, and that the armature is spaced from the second guide segment. This can be achieved, for example, by way of a corresponding dimensioning of the respective diameters of the guide segments or of the armature. In this way, transverse forces acting on the armature can be prevented or reduced. Preferably, the distance between the armature and the second guide segment is selected to be correspondingly small, so that the second guide segment, in spite of the spacing, continues to provide a certain guidance for the armature and stabilizes the armature, for example, against tilting.

As an alternative to the aforementioned embodiment, the first and the second guide segment can also have the same diameter, so that the armature bears against both guide segments and is guided by both guide segments.

It is preferably provided that the armature guide arrangement and / or the armature has a coating, preferably a coating, and / or a separating element whose magnetic conductivity is preferably lower than the magnetic conductivity of the second guide segment. In particular, the coating or the separating element has a layer thickness of greater than 20 μm, the coating preferably comprising a sliding layer and / or a separating layer. In this way, a spacing between magnetically conductive elements and thus a reduction of transverse forces can be achieved.

In a particularly preferred embodiment, it is provided that the second guide segment is arranged in the magnetic circuit between the return part and the armature, so that the second guide segment carries at least part of the magnetic flux between the return part and the armature. The second guide segment is thus located in a region in which the magnetic flux via the armature guide assembly is coupled from the Rückflussteil in the anchor. Since, according to the invention, the second guide segment has a higher magnetic conductivity than the first guide segment, the magnetic flux can be coupled into the armature via the second guide segment in a particularly low-loss manner.

Conveniently, the second guide segment comprises a particular ferromagnetic plate member formed, which is preferably disc-shaped and is designed in particular for attachment of the electromagnetic actuator to a tubular element. In particular, the plate member in a direction parallel to the magnetic flux overlaps with a portion of the reflux part so as to form, at least in sections, a magnetic parallel circuit for guiding the magnetic flux together with the portion of the reflux part. In this way, the coupling of the magnetic flux from the return part into the armature can be further improved.

According to a further embodiment, the first guide segment is connected via a weld to the core part, wherein the weld extends at an edge of the core part facing the armature. In this way, the formation of a gap can be avoided and thus prevented that crevice corrosion could form.

According to a further embodiment, the Ankerführungs- arrangement comprises a plate-shaped third guide segment, which is expediently not magnetic.

According to a further embodiment, the armature guide arrangement and / or the armature is designed such that the armature bears against the third guide segment and is guided by the latter. According to a further embodiment, the inner diameter of the second guide segment is greater than the inner diameter of the first guide segment and larger than the inner diameter of the third guide segment, so that the armature is spaced from the second guide segment.

According to a further embodiment, the core part has a pipe section which adjoins the armature guide arrangement in the axial direction of the armature guide arrangement and whose inner diameter is at least as large as the inner diameter of the first guide segment, so that the armature can be partially positioned in the pipe section.

According to a further embodiment, the inner diameter of the pipe section is greater than the inner diameter of the first guide segment and / or larger than the inner diameter of the third guide segment, so that the armature is spaced from the lateral inner wall of the pipe section.

An exemplary embodiment of the invention is shown in the drawing. It shows

Figure 1 is a schematic sectional view of an electromagnetic actuator, which is attached via a disc-shaped plate member to a tubular element, according to a first embodiment and

Figure 2 is a schematic sectional view of a on a

Pipe element attached electromagnetic actuator according to a second embodiment. 1 shows a schematic sectional view of an electromagnetic actuator 10 according to a first embodiment. The electric actuator 10 is used in particular to cause a displacement of an armature 5 along a displacement path 15 by means of electromagnetic actuation. In the example shown, the electromagnetic actuator 10 is attached to a tubular element 13 and functions, for example, as a valve device to selectively influence a fluid flow flowing through the tubular element 13. For example, the armature 5 has for this purpose at its lower end a sealing element 19 which, depending on the position of the armature 5, opens or closes a connection opening between different sections of the tubular element.

The direction of the displacement path 15 of the armature 5 is also referred to below as the z-direction or axial direction. Further, the direction perpendicular to the displacement path 15 is referred to as x-direction or radial direction.

The electromagnetic actuator 10 includes a coil 1, a yoke 2, the armature 5 and an armature guide assembly 7. With appropriate energization of the coil 1, the elements listed above lead the magnetic flux 8 schematically indicated in FIG.

The yoke 2 has a core part 3 and a return part 4. The core part 3 preferably represents the portion of the yoke 2 which is located inside the coil 1. Accordingly, the return part 4 preferably comprises the portion of the yoke 2 located outside the coil 1. The core part 3 and the return part 4 are magnetically connected to one another. For example, a cover part 17 is provided between the core part 3 and the return part 4, over which the magnetic flux 8 can flow from the core part 3 to the return part 4. By way of example, the core part 3 is rotationally symmetrical, the return part 4 is rotationally symmetrical cup-shaped and the cover part 17 has a rotationally symmetrical annular shape. The core part 3, the return part 4 and the cover part are preferably designed as individual parts attached to one another or fastened to one another. The region of the yoke 4, which adjoins the Ankerfuhrungsanordnung 7 and the magnetic flux 8 substantially in the radial direction or x-direction and coupled into the armature guide assembly 7, hereinafter referred to as radial magnetic field transition 14.

The coil 1 preferably has a number of windings which are arranged along the z-direction concentric with the displacement path 15. Conveniently, the coil 1 is in the form of a prism or cylinder extending along the z-direction. The electromagnet formed by the coil 1 is formed for example neutral or polarized.

As shown by way of example in FIG. 1, the armature guide arrangement 7 is arranged at least in sections inside the coil 1 and provides an armature chamber 5, preferably in the form of a prism or cylinder extending along the z-direction, cross-sections of the armature guide arrangement 7 and the armature 5 are preferably adapted to one another such that a low-friction and low-play linear guide of the armature 5 along the displacement path 15 is ensured. The armature guide arrangement 7 is in particular aligned concentrically with the displacement path 15 and / or the coil 1. The inner contour of the armature guide arrangement 7 limits the degree of freedom of the armature 5 in particular to the displacement path 15 Anchor 5 is mounted relative to the Ankerfuhrungsanordnung 7 and the core part 3 movable.

Between the armature 5 and the core part 3 there is a working air gap 6 whose extension in the z-direction depends on the position of the armature 5 along the displacement path 15.

When providing an electric current to the coil 1, the coil 1 generates the magnetic flux 8, which forms a through the yoke 2, the armature guide assembly 7, the armature 5 and the working air gap 6 extending magnetic circuit. Since the system shown strives for minimum magnetic resistance and the magnetic conductivity of the working air gap 6 is less than the magnetic conductivity of the armature 5, a corresponding driving force acts on the armature 5, which pulls it towards the core part 3, so that the working air gap 6 decreases becomes. The total of the magnetic flux 8 experienced magnetic resistance is thus minimized. A provision of the armature 5 in the neutral position according to the figure 1 is achieved by way of example after switching off the current application for the coil 1 with a return spring 18 shown by way of example.

As already mentioned above, an object of the invention is to efficiently achieve the greatest possible driving force.

This is achieved according to the invention in that the armature guide arrangement 7 comprises different guide segments 9 and 11 and a first guide segment 9 located in the region of the working air gap 6 has a lower magnetic conductivity than a second guide segment 11 not located in the region of the working air gap. As shown in FIG. 1, the first guide segment 9 is provided in the z direction, in particular in the region in which the working air gap 6 is located. In contrast, the second guide segment 11 in the z-direction is not provided in this area. Instead, the second guide segment 11 is located in the z-direction, in particular on the above-described region of the radial agnetfeldübergangs 14 - ie where the magnetic flux 8 is coupled via the armature guide assembly 7 of the return flow part 4 in the armature 5. In particular, the second guide segment 11 is arranged in the magnetic circuit between the return part 4 and the armature 5, so that the second guide segment 11 at least a portion of the magnetic flux 8 between the return part 4 and the armature 5 leads.

Since according to the invention, the second guide segment 11 has a higher magnetic conductivity than the first guide segment 9, the magnetic flux 8 via the second guide segment 11 can be particularly lossless in the armature. 5

be coupled, whereby in the armature 5, a greater magnetic flux is achieved. The larger magnetic flux, in turn, causes the driving force acting on the armature 5 to be increased.

At the same time, as a result of the fact that the first guide segment 9 has a lower magnetic conductivity, it is achieved that as small as possible or no portion of the magnetic flux 8 flows from the armature 5 to the core part 3 via the first guide segment 9 in the area of the working air gap 6. This ensures that as large a proportion of the magnetic flux 8 actually passes through the working air gap 6. This in turn favors the Providing the largest possible driving force and thus enables the solution of the above-mentioned task.

Due to the described inventive design of the second guide segment 11, the advantage is further achieved that the armature guide assembly 7 can be formed thick-walled, without causing an excessive impairment of the achievable driving force is effected. Due to the fact that due to the configuration of the second guide segment 11 according to the invention the radial magnetic field transition 14 experiences a higher magnetic conductivity from the return part 4 to the armature 5, the armature guide arrangement 7 can be made thicker overall, without the magnetic resistance in the region of the radial magnetic field transition. 14 becomes too big.

By a thicker-walled embodiment of the armature guide assembly 7, among other things, a higher load capacity with respect to occurring forces, moments, internal pressures, armature impacts and / or with respect to a occurring Durchreibens can be achieved.

In the illustrated embodiment, the two guide segments 9 and 11 are formed as individual parts. In this way, the two guide segments 9 and 11 may be made of different materials, and thus differ greatly in their magnetic conductivity from each other. In particular, the guide segments are made of materials with different magnetic conductivity. It can thereby be achieved that, in the case of the second guide segment 11, the magnetic flux 8 is coupled particularly well into the armature 5 by the return part 4 due to a good magnetic conductivity, while due to a poor magnetic conductance in the first guide segment 9. Only very little or no portion of the magnetic flux 8 flows parallel to the working air gap 6 from the armature 5 to the core part 3.

Preferably, the second guide segment 11 is made of a non-magnetically or poorly conductive material, such as austenitic stainless steel or brass. The second guide segment 11 is made in particular of a magnetically highly conductive material, such as ferritic steel.

The formed as individual parts guide segments 9 and 11 may be composed to form the armature guide assembly 7 preferably by joining, pressing, soldering, welding, and / or crimping.

Alternatively or in addition to the procedure described above, according to which individual parts are combined with different magical conductivity, a kerführungsanordnung 7 with segmentally different magnetic conductivity can also be done by a sectionally changing material properties, for example, by machining, heat treatment, structural change, forming, Change in material composition, etc ..

Furthermore, it is possible by different

Cross-sectional configurations of the two guide segments 9 and 1 to cause local saturation effects, and so to achieve the difference in the magnetic conductivity described above.

In the example shown, the first guide segment 9 is formed in the form of a pipe section and aligned concentrically with the displacement path 15 and the armature 5. The second Guide segment 11 includes a tubular portion 16 which connects to the tubular formed first guide segment 9 coaxially. In addition, the second guide segment 11 comprises a plate element 12 designed as a disk-shaped section in the example shown. The disk-shaped plate element 12 is arranged concentrically with the coil 1 as an example. In the example shown, the plate member 12 in its center region on an opening through which the armature 5 is guided.

The second guide segment 11 may be formed in one piece, or, as indicated by the dashed lines in Figure 1, of two items - namely a tubular item and a disc-shaped item - be composed. The two items can be firmly connected together or just rest against each other.

The two guide segments 9 and 11 may also have other shapes; It is crucial that the two guide segments 9 and 11 together define the displacement path 15 for the armature 5, while the armature 5 spatially separated from the coil 1 and preferably also from the return part 4, so as to the known manner, the life of the magnetic actuator increase.

As an alternative to the configuration of the second guide segment described above, this can also be formed in the form of a pipe section, as indicated by the dashed lines in FIG. In this case, the element provided with the reference numeral 12 forms an independent disk-shaped plate element. The imagined plate element 12 fulfills two functions in particular. On the one hand it serves to attach the electromagnetic actuator 10 to the tubular element 13 and may for this purpose comprise corresponding fastening sections or elements. On the other hand, it should lead a part of the magnetic flux 8, and is therefore preferably made of a ferromagnetic material.

As shown in Figure 1, the plate member 12 overlaps in a direction parallel to the magnetic flux 8 - ie in the radial or x-direction - with the portion 14 of the return flow part 4. In this way, the plate member 12 at least partially together with the portion 14 of the return flow part, a magnetic parallel circuit, so that in this area a larger magnetic flux 8 can be performed.

The magnetic flux through the plate element 12 depends, in particular, on the magnetic conductivity of the connection or the transition from the section 14 to the plate element 12. If, as shown in the example of FIG. 1, the plate element 12 lies directly on the section 14, a magnetically good conductive connection exists between the plate element 12 and the section 14 and a technically relevant portion of the magnetic flux passes through the plate element 12 However, it is also possible that a plastic layer is provided between the plate member 12 and the portion 14 of the return part 4, which serves for example as a rust protection for the reflux part 4. Such a plastic layer may cause the magnetic conductivity of the junction or connection from the section 14 to the plate element 12 to be greatly reduced, as a result no technically relevant portion of the magnetic flux passes through the plate member 12.

As an alternative to the configuration of the second guide segment 11 and the radial magnetic field transition 14 shown in FIG. 1, after which the second guide segment 11 covers the return part 4 with respect to the armature 5, it is also possible to guide the return part 4 to the armature 5, such that a portion of the return part 4 effectively forms part of the armature guide assembly 7.

Other aspects related to the above object, namely the efficient generation of a large driving force, are discussed below.

First, it is important for the efficient generation of a large driving force that, if possible, transverse forces acting on the armature 5 are avoided. Such transverse forces can occur in particular in the case of direct contact of magnetically conductive components; For example, in the case of a direct contact between the armature 5 and the second guide segment 11, the transverse forces can be based, for example, on remanence effects and / or high local magnetic field strengths distributed asymmetrically with respect to the circumference of the armature 5 and, disadvantageously, so-called magnetic Glue lead. This can occur, in particular, in the case of a magnetic flux caused by permanent-magnet or electrically impressed excitation. The aforementioned lateral forces or the magnetic bonding described can lead in particular to frictional forces between the armature 5 and the armature guide arrangement 7, which promote the wear of these two components. Furthermore, the said transverse forces or magnetic bonding can lead to a reduction in the usable driving force between the armature 5 and the core part 3. To solve the problem described, the armature guide arrangement 7 and / or the armature 5 is preferably designed such that the armature 5 rests on the first guide segment 9 and is guided by it, but at the same time is spaced from the second guide segment 11.

The contact between the armature 5 and the first guide segment 9 with simultaneous spacing of the armature 5 and the second guide segment 11 can be achieved, for example, in the two ways explained below.

On the one hand, the second guide segment 11, in particular in the region of the radial magnetic field transition 14, can have a larger inner diameter than the first guide segment 9. With constant outer diameter of the armature 5, this will thus rest on the first guide segment 9 and be guided by this, while the armature 5 is spaced from the second guide segment 11. In this way, in the second guide segment 11, the attractive forces between the armature 5 and the armature guide arrangement 7 are restricted and, in particular, a distribution of the magnetic field strength in the circumferential direction of the armature 5 in the region of the radial magnetic field transition 14 is achieved.

On the other hand, the outer diameter of the armature 5 in the region of the second guide segment 11 can be made smaller than in the region of the first guide segment 9. With a constant inner diameter of the armature guide assembly 7 is achieved in that the armature 5, the first guide segment 9 is touched or guided by this is while it is spaced from the second guide segment 11.

Alternatively or additionally, the described transverse forces on the armature 5 can also be prevented or prevented. be reduced that the armature guide assembly 7 and / or the armature 5 has a coating, preferably a coating, and / or a separator whose magnetic conductivity is preferably less than the magnetic conductivity of the second guide segment eleventh

According to this measure, in particular, the anchor jacket surface or the inner surface of the armature guide assembly 7 may be provided with a thin magnetic coating poorly conductive to ensure a minimum distance between the armature 5 and the armature guide assembly 11. In particular, a minimum distance between a metal part of the armature 5 and the armature guide arrangement 11 is ensured.

Alternatively, a thin-walled, poorly conductive magnetic separating element between the Ankerführungs- arrangement 7 and the armature 5 can be introduced.

By providing said coating or the separating element, the anchor guide can extend over the entire anchor length in the z-direction. In particular, the armature 5 can also be guided in the region of the second guide segment 11.

Ideally, a friction-reducing coating (for example with PTFE) or a PTFE film or a PTFE adhesive film is used as the coating or separating element. In particular, a coating or a coating with low magnetic conductivity is used. In addition, the armature guide arrangement 7 or its individual parts can be produced by forming, in order to produce a surface which is more favorable in terms of friction (groove direction, supporting portion) than can be achieved, for example, by machining processes (turning). The described procedure - namely the coating of the armature or of the armature guide arrangement 7 - is particularly advantageous in the case of layer thicknesses in the range from greater than 20 μm to preferably approximately 50 μm. In this area, a particularly good coupling of the magnetic flux 8 i region of the radial magnetic field transition 14 has been shown.

According to a further embodiment, the armature 5 is coated. The layer preferably consists of a magnetic separating layer and / or an overlying sliding layer. The two layers together ensure a minimum distance between the armature 5 and the armature guide assembly 7. As a sliding layer, a known standard sliding layer can be used, the layer thickness is, for example, 15 μτ. The magnetic separation layer is preferably with a layer thickness of 50 to 100 μτα. educated. The magnetic separating layer is formed, for example, as a chromium separating layer, ceramic separating layer, or plastic separating layer. For example, a conventional sliding layer is located above the magnetic separating layer.

A further possibility of avoiding transverse forces acting on the armature, which rest on an asymmetrical flow distribution, consists in configuring the armature 5 in the direction of the working air gap 6 or towards the core part 3 so that it tapers in the direction tapered to the core part 3. By such a configuration of the armature 5 can be achieved that the upper edge of the armature 5 is always magnetically saturated with respect to the core part 3, so that the armature 5 automatically aligns relative to the core part 3 and thus counteracts an asymmetric flow distribution entge. This advantage can also be achieved by a conical configuration of the core part, in particular a

cone-shaped configuration, in which the core part tapers in the direction of the anchor. In a conical configuration of the core part, the armature may be cylindrical, for example.

In the example shown in FIG. 1, a recess is also provided in the side of the armature 5 facing the core part 3, which recess serves to receive a section of the core part 3 and thus contributes to the transverse stability of the armature 5. Alternatively, however, the armature 5 may be formed without such a recess.

In addition or as an alternative to the procedure described above, in the region of the second guide segment 11 or of the radial magnetic field transition 14, an axial displacement can be avoided by selecting a layer thickness of the combination layer of magnetic separating layer and sliding layer, in which an equalization of the flow takes place.

Preferably, the first guide segment 7 via a

Weld seam connected to the core part 3, which extends at an edge of the core part 3 facing the armature 5. In particular, this is a lower edge of the core part 3. Due to the fact that the weld seam is formed on such an edge of the core part 3, there is no gap in which crevice corrosion could form.

FIG. 2 shows an electromagnetic actuator 30 according to a second embodiment. The electromagnetic actuator 30 corresponds in its basic structure and its basic function of the previously discussed Electromagnetic actuator 10. To avoid repetition, the following explanation will focus on the differences from the electromagnetic actuator 10 discussed above. Apart from the differences discussed below, the electromagnetic actuator 30 is formed in correspondence with the electromagnetic actuator 10.

Thus, in the second embodiment as well, the armature guide arrangement 7 has different guide segments 9 and 11, wherein the first guide segment 9 located in the region of the working air gap 6 has a lower magnetic conductivity than the second guide segment 11 not located in the region of the working air gap.

With the formulation that the first guide segment 9 is located in the area of the working air gap 6, it is meant in particular that the first guide segment 9 is in the same coordinate range in the z direction as the working air gap 6 and / or in the z direction in a coordinate range located immediately adjacent to the coordinate range in the z-direction, in which the working air gap 6 is located.

By the formulation that the second guide segment 11 is not in the area of the working air gap 6, it is meant in particular that the second guide segment 11 does not share any z-coordinates with the working air gap and is also not located in a z-coordinate area which adjoins directly the z coordinate range of the working air gap 6 is connected. Preferably, the second guide segment 11 is further away from the working air gap 6, in particular in the z-direction, than the first guide segment 9. In the second embodiment, the armature guide assembly 7 of the electromagnetic actuator 30 preferably comprises a plate-shaped third guide segment 22. Conveniently, the third guide segment 22 has a disc-shaped basic shape. In the example shown, the third guide segment 22 in its center region on an opening through which the armature 5 is guided. Optionally, the third guide segment 22 has a disk section and a pipe section extending from the disk section in the axial direction z to the pipe element 13. The pipe section serves, in particular, to guide the armature 5 and expediently projects into the pipe element 13. Conveniently, the third guide segment 22 is integrally formed. The third guide segment 22 is preferably made of non-magnetic material, such as austenitic steel. Preferably, no magnetic flux occurs through the third guide segment 22.

The third guide segment 22 is arranged in the axial direction z of the armature guide arrangement 7 on the side of the second guide segment 11 facing away from the first guide segment 9. Thus, the second guide segment 11 is located in the axial direction z between the first guide segment 9 and the third guide segment 22. By way of example, the third guide segment 22 connects directly to the second guide segment 11. The second guide segment 22, in turn, preferably directly adjoins the first guide segment 9. The first guide segment 9 and the second guide segment 11 are preferably tubular, while the third guide segment 22 - as already mentioned - is plate-shaped. The first guide segment 9, the second guide segment 11 and the third guide segment 22 are in particular arranged coaxially with one another. Conveniently, the guide segments 9, 11, 22 together form a cylindrical Riche anchor chamber ready. Conveniently, there is no overlap between the guide segments 9, 11, 22 in the axial direction z.

In contrast to the first embodiment, the second guide segment 11 expediently does not have the plate element 12 in the second embodiment. In order to fix the electromagnetic actuator 30 to the tube element 13, in the second embodiment the third guide segment 22 is used by way of example.

Conveniently, the armature guide assembly 7 and / or the anchor 5 is configured such that the armature 5 abuts the third guide segment 22 and is guided by this. For example, the inner diameter of the third guide segment 22 and the outer diameter of the armature 5 are selected so that the armature 5 abuts against the third guide segment 22 and is guided by this.

The inner diameter of the second guide segment 11 is preferably larger than the inner diameter of the first guide segment 9. Preferably, the inner diameter of the second guide segment 11 is greater than the inner diameter of the third guide segment 22. The armature 5 is expediently abutted against the first guide segment 9 and the third guide segment 11 and is guided by these two guide segments 9 and 11. By the described embodiment can be achieved that the armature 5 is spaced from the second guide segment 11. This is in particular a spacing in the x-direction - ie perpendicular to the axial direction z. Due to the spacing in the x-direction, the magnetic field transition can be optimized and the lateral forces minimized. The armature 5 preferably has a Outer diameter which is substantially constant over the axial extent of the armature 5.

Expediently, the core part 3 has a pipe section 23 which adjoins the armature guide arrangement 7 in the axial direction z of the armature guide arrangement 7 and whose inside diameter is at least as large as the inside diameter of the first guide segment 9, so that the armature 5 is partially positioned in the pipe section 23 can. In the example shown, the pipe section 23 is formed by the fact that the core part 3 has a cylindrical recess on its end facing the armature 5.

By way of example, the inner diameter of the tube section 23 is greater than the inner diameter of the first guide segment 9 and / or larger than the inner diameter of the third guide segment 11. In this way, the armature 5 is achieved in a state in which it is partially positioned in the tube section 23 is spaced from the lateral inner wall of the pipe section 23. In this way it can be achieved that the armature 5 is spaced in the x-direction from the core part 3, whereby an optimization of the magnetic field transition and a minimization of the transverse forces can be achieved.

By way of example, the armature 5 has a coating 21 which corresponds to the coating already discussed above in connection with the first embodiment. By way of example, the coating 21 is provided on the entire lateral surface of the armature 5. In particular, if the above-mentioned spacing between the second guide segment 11 and the armature 5 is given, can also be dispensed with the coating 21 and / or a coating 21 may be used, which is only for Reduction of friction - and not necessarily for magnetic separation - is used.

As discussed above, in the first embodiment, the armature 5 is configured conically in the direction of the working air gap 6 and toward the core part 3, respectively. By way of example, the armature 5 in the second embodiment has no

cone-shaped configuration. Instead, the outer diameter of the armature 5, as mentioned above, is substantially constant.

The above-described features of the embodiments discussed above are not only to be understood in their exemplary context shown, but also individually and independently of each other with the combination of features defined in the claims combined with the respective, To achieve the above-described features related additional benefits.

Claims

Expectations

1. Electromagnetic actuating device (10; 30), comprising a coil (1), a yoke (2) with a core part (3) and a return part (4), an armature (5) movable relative to the core part (3), an between the working air gap (6) formed by the core part (3) and the anchor (5) and an anchor guide arrangement (7) for guiding the anchor (5), the return part (4), the anchor guide arrangement (7), the anchor (5), the Air gap (6) and the core part (3) form a magnetic circuit for a magnetic flux (8) generated by the coil (1), characterized in that the armature guide arrangement (7) comprises various guide segments (9; 11) and an im The first guide segment (9) located in the area of the working air gap (6) has a lower magnetic conductivity than a second guide segment (11) not located in the area of the working air gap.

2. Electromagnetic actuating device (10; 30) according to claim 1, characterized in that the armature guide arrangement (7) and / or the armature (5) is designed such that the armature (5) rests on the first guide segment (9) and from this is guided, and that the anchor (5) is spaced from the second guide segment (11).

3. Electromagnetic actuating device (10; 30) according to claim 1 or 2, characterized in that the guide segments (9; 11) are each designed as individual parts, which are assembled to form the anchor guide arrangement (7), preferably by joining, pressing in, soldering, welding, and / or flanging.

4. Electromagnetic actuating device (10; 30) according to one of claims 1 to 3, characterized in that the guide segments (9; 11) designed as individual parts are made of materials with different magnetic conductivities.

5. Electromagnetic actuating device (10; 30) according to one of claims 1 to 4, characterized in that the armature guide arrangement (7) and / or the armature (5) has a coating (21), preferably a coating, and / or a separating element , whose magnetic conductivity is preferably lower than the magnetic conductivity of the second guide segment.

6. Electromagnetic actuating device (10; 30) according to claim 5, characterized in that the coating (21) or the separating element has a layer thickness of greater than 20 /im, the coating (21) preferably comprising a sliding layer and / or a separating layer .

7. Electromagnetic actuating device (10; 30) according to one of the preceding claims, characterized in that the second guide segment (11) is arranged in the magnetic circuit between the return part (4) and the armature (5), so that the second guide segment (11) at least part of the magnetic flux (8) between the yoke part (4) and the armature (5).

8. Electromagnetic actuating device (10) according to one of the preceding claims, characterized in that the second guide segment (11) comprises a particularly ferromagnetic plate element (12), which is preferably disk-shaped and in particular for fastening the electromagnetic actuating device (10). a tubular element (13) is formed.

9. Electromagnetic actuating device (10) according to claim 8, characterized in that the plate element (12) overlaps with a section (14) of the return flow part (4) in a direction parallel to the magnetic flux (8), so as to be at least partially together with to form a magnetic parallel circuit for guiding the magnetic flux (8) in the section (14) of the return flow part.

10. Electromagnetic actuating device (10; 30) according to one of the preceding claims, characterized in that the first guide segment (7) is connected to the core part (3) via a weld seam, the weld seam being on an edge of the armature (5). Core part (3) runs.

11. Electromagnetic actuating device (30) according to one of the preceding claims, characterized in that the armature guide arrangement (7) comprises a plate-shaped third guide segment (22), which is expediently non-magnetic.

12. Electromagnetic actuating device (30) according to claim 11, characterized in that the armature guide arrangement (7) and / or the armature (5) is designed such that the armature (5) rests on the third guide segment (22) and is guided by it becomes.

13. Electromagnetic actuating device (30) according to claim 12, characterized in that the inner diameter of the second guide segment (11) is larger than the inner diameter of the first guide segment (9) and is larger than the inner diameter of the third guide segment (22), so that the Anchor (5) is spaced from the second guide segment (11).

14. Electromagnetic actuating device according to one of the preceding claims, characterized in that the core part (3) has a tube section (23) which adjoins the armature guide arrangement (7) in the axial direction (z) of the armature guide arrangement (7) and whose inner diameter is at least is as large as the inner diameter of the first guide segment (9), so that the anchor (5) can be partially positioned in the pipe section (23).

15. Electromagnetic actuating device according to claim 14, characterized in that the inner diameter of the pipe section (23) is larger than the inner diameter of the first guide segment (9) and / or is larger than the inner diameter of the third guide segment (11), so that the armature ( 5) is spaced from the lateral inner wall of the pipe section (23).