Electromagnetic actuators, particularly electromagnetic switching devices or valve devices.

Abstract

The electromagnetic actuator (105) includes a coil element (110) having at least one coil core (135) and a coil (140) arranged circumferentially around the coil core (135), the coil core (135) having a rotationally symmetric first region (136) with an axis of symmetry (137), the first region (136) in which the coil core (135) is surrounded by the coil (140) in the circumferential direction, and an armature body (115) that cooperates with the coil element (110) for movement to actuate the armature body (115) and is actuated by a bearing device (106) on one side. and a movable magnetic armature body (115) as a movable actuator element supported on the motor (105) and movable from a first position (147) to a second position (149) by actuating the coil element (110), the support device (106) being arranged radially displaced with respect to a symmetry axis (137) of the coil core (135), the armature body (115) extending radially from the support device (106) through the coil core (135) from a first side (131) to a second side (132) of the coil core (135). The coil core (135) has a second region (138) that extends radially beyond the first region (136) and is disposed between the coil (140) and the armature body (115) in the direction of the axis of symmetry (137) on a second side (132) of the coil core (135), such that at a first position (147) of the armature body (115), a gap (190) between the coil core (135) and the armature body (115) in the direction of the axis of symmetry (137) is smaller on the second side (132) of the coil core than on the first side (131).

Description

Technical Field

[0004] ,

[0001] The present invention relates to an electromagnetic actuator, comprising a coil element having a coil core and a coil arranged radially around the coil core, and a movable magnetic armature body as an actuator element, which cooperates with the coil element for moving the armature body, and an actuator element supported on one side by a support device on the actuator, and is movable from a first position to a second position by operating the coil element.

[0002] Such electromagnetic actuators are known, for example, in the form of electromagnetic switching devices or valve devices, for example in the form of electromagnetic relays or solenoid valves. For example, a solenoid valve in the form of a tilting armature is used, for example, in a vehicle, for example in a commercial vehicle or in a bus for passenger transport, as a control valve for air pressure control. For example, a brake system for a vehicle equipped with an electronic service brake system includes at least one control valve for pressure control.

[0003] An electromagnetic actuator in the form of a tilting armature valve is known, for example, from German Patent Application Publication No. 102016105532. The tilting armature valve has a coil element with a coil core, a coil arranged circumferentially around the coil core, and an armature supported by a support on the end face of the armature. The armature is movable, in particular, from a first position to a second position by applying a current to the coil. Further, a valve seat with an outlet and an inlet for a fluid is provided, and the outlet can be fluid-tightly closed by a sealing element in the first position of the armature, and the outlet is opened in the second position of the armature. According to one embodiment, a spring for pressing the armature against the coil element or the housing of the tilting armature valve is provided.

[0004] Furthermore, other configurations of solenoid valves are also known, for example, as described in German Patent Application Publication No. 102014115207, German Patent Application Publication No. 102018123997, or German Patent Invention No. 102014115206.

[0005] In electromagnetic actuators, particularly in switching or valve devices, such as the configuration of the solenoid valve exemplified above, the solenoid coil and the magnetic core (coil core) that enhances the magnetic force are generally configured, for example, as round or cylindrical in cross-section, due to a positive material / surface ratio. This ensures a uniform distribution of magnetic flux within the core. However, known coil core shapes often cause the magnetic flux to spread unevenly from the magnetic core to the yoke. When used in yoke armature magnets (e.g., tilting armature magnets), this means that a portion of the acting magnetic force acts in the region of the tilting armature's support, or even behind the axis of rotation of the support. This reduces or even weakens the effective magnetic force.

[0006] The fundamental problem of the present invention is to provide an electromagnetic actuator of the type described above, which makes it possible to increase the magnetic force available for the movement that operates the actuator element.

[0007] The present invention relates to an electromagnetic actuator of the type described at the beginning, as set forth in the appended claims. Advantageous embodiments and variations of the present invention are shown in the dependent claims and the following description.

[0008] One aspect of the present invention relates in particular to an electromagnetic actuator having a coil element, wherein the coil element has at least one coil core and coils arranged circumferentially around the coil core, and the coil core is a rotationally symmetric first region having an axis of symmetry, and the coil core is circumferentially surrounded by the coils. The actuator further has a movable magnetic armature body as a movable actuator element, the movable magnetic armature body cooperating with a coil element for movement to actuate the actuator body, one side of which is supported by a support device to the actuator, and is movable from a first position to a second position by actinguating the coil element, the support device is positioned to be radially displaced with respect to the axis of symmetry of the coil core, and the armature body extends radially from the support device through the coil core, from a first side to a second side of the coil core. The coil core further has a second region that extends radially beyond the first region and is located on the second side of the coil core between the coil and the armature body in the direction of the axis of symmetry, thereby, at the first position of the armature body, the gap between the coil core and the armature body in the direction of the axis of symmetry is smaller on the second side of the coil element than on the first side.

[0009] The present invention makes it possible to increase the magnetic force available for the movement that operates the actuator element in the electromagnetic actuator of the type described at the beginning. This is achieved by positioning and configuring the magnetic flux between the coil core and the armature body (yoke) as intended, thereby weakening the magnetic flux toward the support portion on one side, while increasing the magnetic force available at the other end of the armature body. This also has a positive effect on the torque acting on the armature body by the magnetic force, which is increased on the second side of the coil core, farther from the support portion.

[0010] This intended positioning and configuration of the magnetic path between the coil core and the armature body allows for its use in all electromagnetic actuators, essentially in relation to a yoke armature magnet supported on one side, such as a tilting armature magnetic valve device and switching device. This enables optimization of electromagnetic actuators, for example, by using a yoke armature magnet (e.g., a tilting armature magnet) as a drive unit for relays, stroke armatures, and solenoid valves.

[0011] According to one embodiment of an electromagnetic actuator, when viewed in a cross-section along the axis of symmetry of the coil core, a second region of the coil core extends in a stepped manner from the first region. In the second region, the geometry on the end face side of the coil core is particularly advantageous, having an additional step with a maximum possible diameter extending close to the outer circumference of the coil windings. Such an additional step enhances the magnetic field lines of the magnetic field, deflecting them toward the second side of the coil core. This increases the torque acting on the armature body at this point, on the one hand, and reduces the load on the support by a portion of the generated magnetic force. Advantageously, the coil core in the second region, for example by the additional step, covers more than half of the radial extension length of the coil windings arranged circumferentially around the coil core.

[0012] In particular, the coil core is configured such that, in the second region, the center of gravity of the coil core is displaced in the opposite direction to the support device with respect to the axis of symmetry.

[0013] According to one embodiment, the support device is positioned radially outward of the coil core.

[0014] In one embodiment of an electromagnetic actuator, the armature body is characterized in that it has a first region supported by a bearing device to the actuator and a second region extending over a second region of a coil core, wherein the armature body has a magnetic resistance per unit length in the first region that is increased compared to the magnetic resistance per unit length in the second region of the armature body. This allows for an additional reduction in the magnetic flux in the direction of the bearing by increasing the magnetic resistance in the first region of the armature body where the bearing portion is located, thereby further reducing the load on the bearing portion.

[0015] According to one embodiment, the armature body is characterized by having at least one cross-sectional narrowing portion in a first region that is narrower than the cross-section in a second region of the armature body. In particular, the armature body has at least one cross-sectional narrowing portion in the first region on the side of the second region of the armature body that is narrower than the cross-section of the armature body material adjacent to the cross-sectional narrowing portion. In this way, the magnetoresistance can be increased by relatively simple manufacturing techniques.

[0016] According to one embodiment, at least one cross-sectional narrowing portion has a thickness of the armature body that is reduced compared to the thickness of the armature body in a second region of the armature body.

[0017] In particular according to one embodiment, at least one cross-sectional narrowing portion is made up of one or more reductions in the armature body material in a first region.

[0018] For example, at least one cross-sectional narrowing portion is created by notching, embossing, and / or punching the armature body material in a first region.

[0019] According to one embodiment, at least one cross-sectional narrowing portion is located on and / or adjacent to the rotation axis of the bearing body of the bearing device. For example, a notch is provided in the region of the rotation axis of the bearing body. Additionally or alternatively, preferably in the region of the bearing body, the desired reduction of the armature material (yoke) can be achieved by embossing, punching, or cutting.

[0020] According to one embodiment, the armature body is configured as a plate armature. The armature body is advantageously configured as a tilting armature.

[0021] According to one embodiment, the electromagnetic actuator is configured as an electromagnetic switching device or valve device, and the movable armature body is configured as a switching element or valve element.

[0022] In particular, electromagnetic actuators are configured as electromechanical relays or solenoid valves, especially tilting armature valves.

[0023] According to one embodiment, an electromagnetic actuator is configured as a solenoid valve for a vehicle's pressure control module.

[0024] The embodiments described herein can be applied in parallel or in any combination thereof.

[0025] The present invention will be described in detail below based on the figures shown in the drawings. [Brief explanation of the drawing]

[0026] [Figure 1A] Figure 2 shows a schematic cross-sectional view of an exemplary tilting armature valve in which the electromagnetic actuator according to the present invention can be used according to the basic method. [Figure 1B]Another schematic cross-sectional view is shown of an exemplary tilting armature valve in which an electromagnetic actuator according to the present invention, as shown in FIG. 2, can be used according to a basic mode. [Figure 2] A schematic cross-sectional view of one embodiment of an electromagnetic actuator according to the present invention is shown, which can be used, for example, in the tilting armature valve shown in FIG. 1.

[0027] In FIG. 1, based on FIGS. 1A and 1B, a simplified cross-sectional view of a tilting armature valve 100 according to one example is shown, in which an electromagnetic actuator according to the present invention, as shown in FIG. 2, can be used according to a basic mode. FIG. 1 shows an exemplary and practical use of an electromagnetic actuator based on a tilting armature valve. The configuration according to the present invention of the coil core, the armature body and other components is shown in detail in FIG. 2 according to one example and can basically be easily transferred by those skilled in the art to the tilting armature valve shown in FIG. 1. In this context, it is pointed out to those skilled in the art that the basic manner of operation of an electromagnetic actuator, for example, a switching device or a valve device with an armature body movable by a magnetic field as a switching element or a valve element, is known to those skilled in the art.

[0028] The tilting armature valve 100 may basically be one example of the tilting armature valve 100 shown in German Patent Application Publication No. 102016105532. In one variant embodiment, the tilting armature valve 100 may be a solenoid valve to which reference numeral 100 is assigned in FIG. 1 of the above-mentioned specification. However, other examples are also conceivable in connection with solenoid valves as described, for example, in other publications mentioned above. The plurality of embodiments of the solenoid valve described in German Patent Application Publication No. 102016105532, their components and their use are also part of the disclosure of the present invention by reference.

[0029] Figure 1A shows a cross-sectional view of a tilting armature valve 100 according to one embodiment in which the armature is located in a first position. The tilting armature valve 100 has a coil element 110, an armature body (or simply armature) 115, a spring 120, a seal element 125, and a cover shell 130. The coil element 110 includes at least one coil core 135 and a coil 140 circumferentially arranged around the coil core 135, the coil 140 comprising a packet of coil windings (not explicitly shown). The end face of the armature 115 is supported by a support 145. The armature 115 is movable between a first position 147 and a second position 149. Here, the armature 115 is configured to be moved from the first position 147 (suctioned) to the second position 149 when the coil 140 is actuated. When the coil 140 is actuated, the armature 115 can be held in the second position 149. A seal element 125 is further arranged on the face of the armature 115 facing away from the coil element 110. The cover shell 130 has a valve seat 150 with an outlet 155 and an inlet 157 for the fluid 158. Here, when the armature 115 is arranged in the first position 147, the outlet 155 can be fluid-tightly closed by the seal element 125. Here, the seal element 125 may further act as a damper element to prevent the armature 115 from colliding with the valve seat 150. The seal element 125 may here be attached to the armature 115 or a support element by a rubber coating. Further, when the armature 115 or the seal element 125 collides with the valve seat 150, an angle may be formed by an inclined nozzle, or an inclinedly shaped seal element 125, or a curved armature 115. Such a nozzle not explicitly shown in Figure 1A does not necessarily have to be incorporated into the tilting armature valve 100 and may be provided from an external housing part.

[0030] Furthermore, it is also possible that the valve seat 150 is located on the coil element 110, but this is not explicitly shown in Figure 1A for clarity. In this case, an operating unit that transmits the opening of the outlet via the armature 115 is advantageous.

[0031] In this embodiment, the armature 115 has at least one protrusion 160 on its support portion 162, which is at least partially rounded, and the protrusion 160 advantageously engages with a recess 165 or opening located in the portion of the housing 170 of the tilting armature valve 100 that is opposite to the protrusion 160. This allows the armature 115 to slide in the recess as it moves from a first position 147 to a second position 149 after the current flow through the coil 140 is switched on, and at the same time, it is held in a fixed position in the housing 170 or against the cover shell 130. The recess is preferably formed in a trapezoidal shape, which creates as little friction as possible when the protrusion slides on the upper surface of the recess 165. The recess 165 may be made of, for example, a plastic material, which makes it very easy and inexpensive to manufacture.

[0032] In this embodiment, the spring 120 is configured as a leaf spring and is positioned in the bearing portion on the opposite side of the armature 115 from the coil 140. The spring 120 is used here to press the bearing ball, for example, which is press-fitted into the armature 115, without any play into the (e.g., trapezoidal) opposing shell or recess 165 in the housing 170 of the coil element 110. The armature 115 can be fixed by the spring 120, thereby holding the armature 115 in a predetermined position. This provides the advantage that a constant preload can be applied to the armature 115, and the force that the spring 120 applies to the armature 115 can be applied to the armature 115 as close as possible to the point of force application located on the axis of rotation.

[0033] Alternatively, the armature 115 can be suspended from the coil element 110. In this case, the spring 120, which is formed as a leaf spring, can be omitted.

[0034] Figure 1B shows a cross-sectional view of the tilting armature valve 100 with the armature 115 in a second position 149. In this case, the current through the coil 140 is switched on, attracting the armature 115, thereby creating a magnetic field indicated by the magnetic field lines 180. When the current through the coil 140 is switched off, the armature 115 can fall back to its original position 147, for example, by gravity or the spring force of the illustrated return spring.

[0035] However, as shown in Figure 1, the cylindrical shape of the coil core 135 causes the magnetic flux (illustrated exemplarily by magnetic field lines 180) to extend unevenly from the magnetic center to the yoke. However, when used in a yoke armature magnet or tilting armature magnet as shown in Figure 1, this means that a significant portion of the acting magnetic force also acts on the support portion 162 of the armature 115. As a result, the effective magnetic force on the side of the sealing element 125 is reduced or even weakened, and an additional magnetic force is applied to the support portion 162, which is undesirable in many actuator structural configurations.

[0036] Figure 2 shows a schematic cross-sectional view of one embodiment of an electromagnetic actuator according to the present invention, which can be used, for example, in the tilting armature valve shown in Figure 1. In Figures 1 and 2, the same, the same function, or similar components are denoted by the same reference numerals.

[0037] Unlike the tilting armature valve 100 shown in Figure 1, the electromagnetic actuator 105 shown in Figure 2 has a coil element 110, in which the coil core 135 has a first region 136 which is rotationally symmetric with an axis of symmetry 137 and the coil core 135 is circumferentially surrounded by the coil 140, and a second region 138 which extends radially beyond the first region 136, that is, on at least one side of the coil core 135, has a radial extension length that exceeds the radial extension length of the first region 136. As a result, in the first region 136, the coil core is configured cylindrically around the axis of symmetry 137, similar to the coil core 135 shown in Figure 1, whereas in the second region 138 it is not.

[0038] Thus, unlike in Figure 1, according to the present invention, a second region 138 of the coil core 135, which is asymmetric with respect to the axis of symmetry 137, is additionally provided to exert an asymmetrical effect on the magnetic field. In particular, when viewed in a cross-section along the axis of symmetry 137 of the coil core 135, the second region 138 of the coil core 135 is stepped in half of a substantially rotationally symmetric (cylindrical) region 136, starting from the first region 136. The second region 138 may be rectangular or partially circular, for example, a semicircle, or another geometric shape when viewed in plan, for example, a geometric shape (e.g., a semicircle) that corresponds to the geometric shape of the armature 115 (e.g., rounded or semicircular in region 117) when viewed in plan. Therefore, the coil core 135 in the second region 138, on the side farther from the armature support, is provided with an additional step distinct from the cylindrical shape of the first region 136, which advantageously extends to or near the outer circumference of the coil winding 141, to the maximum possible diameter.

[0039] The armature 115 is supported on one side by a support device 106 at the actuator 105. In this embodiment, the support device 106 is positioned radially displaced with respect to the axis of symmetry 137 of the coil core 135 and is fixed to the actuator 105, preferably on the radially outer side of the coil core 135 or on the outer circumference of the coil core 135, around the coil element 110. The armature 115 here extends radially from the support device 106 through the coil core 135, from the first side 131 to the second side 132 of the coil core 135. The second side 132 is located radially opposite to the first side 131.

[0040] The armature 115 is moved from a first position 147 (which may be horizontal or slightly tilted as shown in Figure 1A) to a second attracted position (a similar position 149 in Figure 1B, not shown in Figure 2) by acting on the coil element 110 (current flow in the coil 140), as described with reference to Figure 1, and is therefore attracted downward to the coil 140.

[0041] A second region 138 of the coil core 135, extending radially and asymmetrically beyond the first region 136, is positioned between the coil 140 and the armature 115 on the second side 132 of the coil core 135, viewed in the direction of the axis of symmetry 137. This creates a gap 190 between the coil core 135 and the armature 115 in the direction of the axis of symmetry 137 (and therefore in the longitudinal direction of the coil core 135), and this gap 190 is configured asymmetrically between the first side 131 and the second side 132 of the coil core 135. In particular, at the first position 147 of the armature 115, the gap 190 between the coil core 135 and the armature 115 in the direction of the axis of symmetry 137 is smaller on the second side 132 of the coil core than on the first side 131. As a result, the magnetic resistance (Rm) for the magnetic field lines 180 on the second side 132 becomes smaller than that on the first side 131. That is, Rm = Rm, iron + Rm, air That is the case.

[0042] In this context, "iron" refers to the armature material and the materials for the coil core 135 and housing 170. These components may be composed of the same or different magnetic conductive materials.

[0043] Since the magnetic resistance Rm is proportional to the length that the magnetic field lines 180 must penetrate, the Rm in the second side 132 is significantly smaller than that in the first side 131, where the air gap 190 is comparatively significantly larger, due to the steps of the coil core 135 in the second region 138 and the resulting reduction in air gap 190.

[0044] Therefore, such an additional step in the second region 138 causes the magnetic field lines 180 of the magnetic field to be reinforced and deflected toward the second side 132 of the coil core 135, thereby increasing the torque acting on the armature 115 at this point, and reducing the load on the support device 106 by a portion of the generated magnetic force. Advantageously, the coil core 135 in the second region 138, i.e., the illustrated additional step, covers more than half of the radial extension length of the coil windings 141 arranged circumferentially around the coil core 135. Basically, the additional step or head of the coil core 135 may extend in the second region 138 to or near the housing 170. However, even if the radial extension length of the step that enters the radial region of the coil windings 141 is shorter, the magnetic field line distribution can still be improved. Advantageously, the coil core 135 is configured such that, in the second region 138, the surface centroid of the coil core 135 is displaced in the opposite direction to the support device 106 with respect to the axis of symmetry 137.

[0045] This allows, according to the present invention, to increase the magnetic force available for the movement that drives the armature 115 by configuring the magnetic path between the coil core 135 and the armature 115 such that, on the one hand, the magnetic flux in the direction of the support device 106 is weakened by the larger air gap 190, while on the other hand, the available magnetic force on the opposite side of the armature 115 is increased. This also has a positive effect on the torque acting on the armature 115 by the magnetic force, which is increased on the second side 132 of the coil core 135, farther from the support device 106, because the magnetic field lines 180, and thus the center of force, are displaced in the direction of the second side 132, over a larger radius of the armature 115. This also has the positive effect of reducing the additional magnetic force acting on the support device 106.

[0046] The displacement of the magnetic field lines 180 in the direction of the second side 132 of the coil core 135 can be increased, by which the armature 115 has a magnetoresistance per unit length that is increased in the first region 116 compared to the magnetoresistance per unit length in the second region 117 of the armature 115. In the first region 116, the armature 115 is supported by the actuator 105 by the support 106, and in the second region 117, the armature 115 extends over the second region 138 of the coil core 135. Thus, the magnetoresistance per unit length near the support is higher than in the stepped region of the coil core 135. By doing so, the magnetic field lines 180 in the direction of the second side 132 can also be displaced over a larger radius of the armature 115.

[0047] In the first region 116 of the armature 115, at least one narrowed cross-sectional area 118 is provided compared to the cross-section in the second region 117 of the armature 115, thereby increasing the magnetic resistance per unit length. Since the magnetic resistance Rm is inversely proportional to the cross-sectional area of ​​the armature material through which the magnetic field lines 180 must pass, the narrowed cross-sectional area 118 makes the Rm per unit length in the first region 116 of the armature 115 higher than in the second region 117. Furthermore, as shown in Figure 2, by displacing and positioning the narrowed cross-sectional area 118, the resulting curvature can extend the path that the magnetic field lines 180 must travel, which also increases the magnetic resistance proportional to the length they must travel.

[0048] As shown in Figure 2, in the narrow cross-section 118, each cross-section of the armature 115 is reduced compared to the cross-section of the armature body material adjacent to the narrow cross-section 118 on the side of the second region 117.

[0049] In the embodiment shown in Figure 2, the narrow cross-sectional portion 118 has a thinner thickness d1 of the armature 115 (in the direction of the axis of symmetry 137) compared to the thickness d2 of the second region 117 of the armature 115.

[0050] The cross-sectional narrowing portion 118 can be fabricated by a reduction (indicated by reference numeral 119 in Figure 2) in the first region 116 of the armature body material. The reduction 119 (e.g., in the form of a hollow, recess, or indentation) is fabricated, for example, by notching, embossing, and / or punching of the armature body material. As shown in Figure 2, the cross-sectional narrowing portion 118 is advantageously positioned on and / or adjacent to the pivot axis of the bearing body of the bearing device 106.

[0051] This allows the magnetic flux to be advantageously attenuated in the direction of the support by positioning and configuring the magnetic path between the magnetic core and the armature (yoke) as intended. Furthermore, it is possible to increase the available magnetic force and reduce the support reaction force with the resulting low support friction.

[0052] In the illustrated embodiment, the armature 115 is formed as a plate armature, similar to the embodiment in Figure 1, as used, for example, in the tilting armature valve 100 shown in Figure 1. The armature 115 is fixed and supported on one side, in this embodiment at the end face, by a support device 106 to the actuator 105, for example, the tilting armature valve 100, and is moved between a first position and a second position by the operation of the coil 140, as described with reference to Figure 1. The support device 106, having a support rotation axis perpendicular to the axis of symmetry 137 of the coil core 135, is shown in Figure 2 differently from the support portion 162 and support body 145 in Figure 1, and is merely intended to schematically show the support on one side of the armature 115. Various mechanisms can be used for the support, for example, the mechanism in Figure 1, or other mechanisms in the publications mentioned above.

[0053] The actuator 105 shown in Figure 2 was described in the overview of Figure 1 in relation to a solenoid valve in the form of a tilting armature valve 100. In contrast, when used in an electromagnetic switching device, for example in a relay, the armature 115 shown in Figure 2 can be used as an electrically switching element that closes or opens electrical contacts, similar to a valve opening. The described method of magnetic field rearrangement by the configuration of the coil core 135 and armature 115 is basically applicable to all electromagnetic armature valve devices and switching devices described in the higher-level concepts. [Explanation of symbols]

[0054] 100 Tilting Armature Valve 105 Electromagnetic Actuator 106 Bearing device 110 coil elements 115 Armature Body 116 The first area 117 Second Domain 118 Narrow cross section 119 Decreasing part 120 springs 125 seal elements 130 Housing section 131 First side 132 Second side 135 Coil Cores 136 The first area 137 Axis of Symmetry 138 Second Domain 140 coils 141 Coil winding 145 Supporting body 147 First Position 149 Second position 150 valve seats 155 Exit 157 Entrance 158 Fluid 160 Ridge 162 Support part 165 recess 170 Housing 180 Magnetic Field Lines

Claims

1. An electromagnetic actuator (105), The coil element (110) has at least one coil core (135) and coils (140) arranged circumferentially around the coil core (135), wherein the coil core (135) is a rotationally symmetric first region (136) having an axis of symmetry (137), and the coil core (135) is surrounded circumferentially by the coils (140) in the first region (136), The movable magnetic armature body (115) is a movable actuator element that cooperates with the coil element (110) for moving the armature body (115) and is supported on one side by a support device (106) on the actuator (105), and is movable from a first position (147) to a second position (149) by acting the coil element (110), wherein the support device (106) is positioned to be radially displaced with respect to the axis of symmetry (137) of the coil core (135), and the armature body (115) extends radially from the support device (106) through the coil core (135) from a first side (131) to a second side (132) of the coil core (135), The coil core (135) has a second region (138), the second region (138) extends radially beyond the first region (136), and on the second side (132) of the coil core (135), it is positioned between the coil (140) and the armature body (115) in the direction of the axis of symmetry (137), so that at the first position (147) of the armature body (115), the gap (190) between the coil core (135) and the armature body (115) in the direction of the axis of symmetry (137) is smaller on the second side (132) of the coil core than on the first side (131). The armature body (115) has a first region (116) which is supported by the actuator by the support device (106) and a second region (117) which extends over the second region (138) of the coil core (135), An electromagnetic actuator wherein the armature body (115) has a magnetoresistance per unit length in the first region (116) that is increased compared to the magnetoresistance per unit length in the second region (117) of the armature body (115).

2. The electromagnetic actuator according to claim 1, wherein, when viewed in a cross-section along the axis of symmetry (137) of the coil core (135), the second region (138) of the coil core (135) extends in a stepped manner starting from the first region (136).

3. The electromagnetic actuator according to claim 1, wherein the support device (106) is arranged radially outward of the coil core (135).

4. The electromagnetic actuator according to claim 1, wherein the coil (140) has coil windings (141) arranged circumferentially around the coil core (135), and the coil core (135) is configured such that in the second region (138), the surface center of gravity of the coil core (135) is displaced in the opposite direction to the support device (106) with respect to the axis of symmetry (137).

5. The electromagnetic actuator according to claim 1, wherein the armature body (115) has at least one cross-sectional narrowing portion (118) in the first region (116) that is narrower than the cross-section of the second region (117) of the armature body (115).

6. The electromagnetic actuator according to claim 5, wherein the armature body (115) has at least one cross-sectional narrow portion (118) in the first region (116) on the side of the second region (117) of the armature body (115) that is narrower than the cross-section of the armature body material adjacent to the cross-sectional narrow portion (118).

7. The electromagnetic actuator according to claim 5, wherein at least one of the cross-sectional narrowing portions (118) has a thickness (d1) of the armature body (115) that is reduced compared to the thickness (d2) of the armature body (115) in the second region (117).

8. The electromagnetic actuator according to claim 5, wherein at least one of the cross-sectional narrowing portions (118) is formed by a reduction portion (119) of the armature body material in the first region (116).

9. The electromagnetic actuator according to claim 5, wherein at least one of the cross-sectional narrowing portions (118) is produced by notching, embossing and / or punching (119) of the armature body material in the first region (116).

10. The electromagnetic actuator according to claim 5, wherein at least one of the cross-sectional narrow portions (118) is located on and / or adjacent to the axis of rotation of the support body of the support device (106).

11. The electromagnetic actuator according to claim 1, wherein the armature body (115) is configured as a plate-type armature.

12. The electromagnetic actuator according to claim 1, wherein the armature body (115) is configured as a tilting armature.

13. The electromagnetic actuator according to any one of claims 1 to 12, wherein the electromagnetic actuator is configured as an electromagnetic switching device or valve device (100), and the movable armature body (115) is configured as a switching element or valve element.

14. An electromagnetic actuator according to claim 13, configured as an electromechanical relay or solenoid valve (100).

15. An electromagnetic actuator according to claim 14, configured as a solenoid valve (100) for a vehicle pressure control module.

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