FAST-ACTING ACTUATOR DEVICE

Abstract

A fast-acting actuator device (68), in particular circuit-breaker device, is proposed, has a mechanical tensioning element (10), has an armature element (12) which can be preloaded by the mechanical tensioning element (10) and which, driven by tension release of the mechanical tensioning element (10), is movable from at least one first end position (14) into at least one second end position (16), further has a magnet unit (18) which is configured to hold the armature element (12) in the first end position (14) by means of a magnetic field generated by the magnet unit (18), and has a resetting unit (20) which is configured to move the armature element (12) back at least from the second end position (16) into the first end position (14) by means of a motor-drivable resetting element (22) and, in the process, to preload the mechanical tensioning element (10).

Claims

1. A fast-acting actuator device, in particular circuit-breaker device, having a mechanical tensioning element, having an armature element which can be preloaded by the mechanical tensioning element and which, driven by tension release of the mechanical tensioning element, is movable from at least one first end position into at least one second end position, having a magnet unit which is configured to hold the armature element in the first end position by means of a magnetic field generated by the magnet unit, and having a resetting unit which is configured to move the armature element back at least from the second end position into the first end position by means of a motor-drivable resetting element and, in the process, to preload the mechanical tensioning element.

2. The fast-acting actuator device as claimed in claim 1, wherein a first actuating movement generated by the tension release of the mechanical tensioning element, in which at least the armature element moves from the first end position to the second end position, generates a stroke of at least 7 mm within at most 6 ms.

3. The fast-acting actuator device as claimed in claim 2, wherein a second actuating movement generated by the resetting unit for resetting the mechanical tensioning element, in which at least the armature element moves from the second end position to the first end position, is substantially slower, preferably at least 40 times slower, than the first actuating movement.

4. The fast-acting actuator device as claimed in claim 3, wherein the resetting unit is configured to control, in particular as an alternative to the first actuating movement proceeding independently of the resetting unit, a third actuating movement in which the armature element moves from the first end position to the second end position substantially slower, preferably at least 40 times slower, than in the first actuating movement proceeding independently of the resetting unit.

5. The fast-acting actuator device as claimed in claim 1, wherein the magnet unit comprises an electromagnet which, at least in the activated state, is configured to exert an attracting force effect on at least part of the armature element to fix the armature element in the first end position.

6. The fast-acting actuator device as claimed in claim 5, comprising a housing unit which encloses at least a large portion of the electromagnet and at least a large portion of the armature element and/or at least a large portion of the mechanical tensioning element.

7. The fast-acting actuator device as claimed in claim 5, wherein the electromagnet is arranged at least substantially laterally adjacent to the mechanical tensioning element with respect to an expansion direction of the mechanical tensioning element.

8. The fast-acting actuator device as claimed in claim 1, wherein the resetting unit, in particular the motor-drivable resetting element, has a driver element that is supported so as to be movable, in particular relative to a housing unit of the actuator device, for contacting the armature element during an actuating movement by the resetting unit.

9. The fast-acting actuator device as claimed in claim 1, wherein the motor-drivable resetting element is formed as a gearwheel.

10. The fast-acting actuator device as claimed in claim 8, wherein the motor-drivable resetting element is formed as a gearwheel and wherein the driver element is arranged on a side face of the gearwheel and thus follows a movement of the gearwheel.

11. The fast-acting actuator device as claimed in claim 10, wherein the driver element is configured to entrain the armature element over at least 120 of a monotonic rotational movement of the gearwheel and/or over at most 170 of the monotonic rotational movement of the gearwheel.

12. The fast-acting actuator device as claimed in claim 8, wherein the motor-drivable resetting element is formed as a gearwheel and wherein the driver element is configured to release the armature element following an entrainment by a rotational movement of the gearwheel, in particular by a continuation of the rotational movement of the gearwheel.

13. The fast-acting actuator device as claimed in claim 8, wherein the armature element has a contact element for receiving a force exerted by the driver element on the armature element, the contact element being configured to be at least partially swept over by the driver element during the actuating movement by the resetting unit.

14. The fast-acting actuator device as claimed in claim 13, wherein the armature element comprises at least one first armature sub-element and a second armature sub-element connected to the first armature sub-element, said second armature sub-element being arranged at least substantially perpendicular to the first armature sub-element, wherein the contact element is arranged on the first armature sub-element and wherein the second armature sub-element comprises at least one seat for supporting the mechanical tensioning element and/or at least one magnetic element, which is configured to interact with the magnetic field of the magnet unit by attraction.

15. The fast-acting actuator device as claimed in claim 14, wherein the seat for supporting the mechanical tensioning element and the magnetic element are arranged, relative to the first armature sub-element, on opposite sides of the first armature sub-element.

16. The fast-acting actuator device as claimed in claim 14, comprising at least one reinforcing element, by means of which the first armature sub-element is supported and reinforced on the second armature sub-element at least on a side facing towards the seat for supporting the mechanical tensioning element.

17. The fast-acting actuator device as claimed in claim 1, wherein the armature element has an integrally molded-on guide element for receiving and/or guiding the mechanical tensioning element.

18. The fast-acting actuator device as claimed in claim 17, wherein the mechanical tensioning element is formed as a spiral spring wound at least section-wise around the guide element.

19. The fast-acting actuator device as claimed in claim 1, comprising an actuating element, which is at least operatively connected to the armature element and is preferably formed integrally with the armature element, and which is arranged on a side of the armature element opposite the mechanical tensioning element.

20. The fast-acting actuator device as claimed in claim 1, comprising an electric motor, which is configured to generate a drive force for moving the resetting element.

21. The fast-acting actuator device as claimed in claim 20, comprising a worm gear, which is configured to transmit the drive force of the electric motor to the resetting element.

22. The fast-acting actuator device as claimed in claim 20, wherein the electric motor is configured to generate a reverse rotation for a controlled transfer of the armature element from the first end position to the second end position, in particular guided by the driver element.

23. The fast-acting actuator device as claimed in claim 1, comprising a sensor unit, which is configured to detect and/or monitor at least one state and/or a movement of the armature element.

24. The fast-acting actuator device as claimed in claim 23, wherein the sensor unit is configured to detect and/or monitor a motor current of an electric motor of the resetting unit for determining a reset time of the resetting unit within which the armature element is brought from the second end position to the first end position, for determining a current position of a driver element of the resetting unit, and/or for determining a travel path of the driver element of the resetting unit.

25. The fast-acting actuator device as claimed in claim 23, wherein the sensor unit comprises a Hall sensor, which is configured to monitor a movement at least of a portion of the resetting element for determining the reset time of the resetting unit, the current position of the driver element and/or the travel path of the driver element.

26. The fast-acting actuator device as claimed in claim 23, wherein the sensor unit is configured to detect a transfer position of the resetting unit, in which the armature element is transferred to the magnet unit after a reset by the resetting unit.

27. The fast-acting actuator device as claimed in claim 26, wherein the sensor unit is configured to detect an induction signal for identifying the transfer position.

28. The fast-acting actuator device as claimed in claim 27, wherein the magnet unit comprises an electromagnet which, at least in the activated state, is configured to exert an attracting force effect on at least part of the armature element to fix the armature element in the first end position and wherein the sensor unit is formed at least partially integrally with the electromagnet, in which the induction signal is generated by an approach of the armature element to the electromagnet.

29. An actuator, in particular circuit breaker, with a fast-acting actuator device as claimed in claim 1.

30. A method with a fast-acting actuator device, in particular with a circuit breaker device, in particular as claimed in claim 1.

31. The method as claimed in claim 30, with a tensioning step in which an armature element is moved by a motor-driven resetting unit into a first end position held stable, preferably directly, by a magnetic field, as a result of which a mechanical tensioning element supported on the armature element is tensioned at the same time, and with a first tension-release step and a second tension-release step, which can be carried out as an alternative to the first tension-release step, wherein in the first tension-release step the armature element is released from the first end position and moved with an uncontrolled acceleration into the second end position by the mechanical tensioning element, and wherein in the second tension-release step the armature element is released from the first end position and is moved by the mechanical tensioning element with an acceleration controlled by the resetting unit into the second end position.

32. The method as claimed in claim 31, wherein the first tension-release step is configured for an emergency actuation of the fast-acting actuator device, in particular for triggering a safety disconnection of the circuit breaker device, while the second tension-release step is configured for a regular actuation of the fast-acting actuator device, in particular for triggering an orderly disconnection of the circuit breaker device.

Description

DRAWINGS

[0038] Further advantages can be found in the following description of the drawings. The drawings show an exemplary embodiment of the invention. The drawings, the description and the claims contain numerous features in combination. A person skilled in the art will expediently also consider the features individually and combine them to form useful further combinations.

[0039] In the drawings:

[0040] FIG. 1 shows a schematic side view of an actuator with a fast-acting actuator device,

[0041] FIG. 2 shows a schematic view of the fast-acting actuator device with a first hidden part of a housing unit and with an armature element located in a first end position,

[0042] FIG. 3 shows a further schematic view of the fast-acting actuator device with a second hidden part of the housing unit, with the armature element located in the first end position and with a driver element, a resetting unit, located in a release position,

[0043] FIG. 4 shows a schematic view of the fast-acting actuator device with the first hidden part of the housing unit, with a partially hidden magnet unit, and with an armature element located in a second end position,

[0044] FIG. 5 shows a schematic view of a part of the fast-acting actuator device with the armature element and with the resetting element of the resetting unit,

[0045] FIG. 6 shows a schematic perspective view of the armature element, and

[0046] FIG. 7 shows a schematic flow diagram of a method.

DESCRIPTION OF THE EXEMPLARY EMBODIMENT

[0047] FIG. 1 shows a schematic side view of an actuator 66. The actuator 66 is formed as a circuit breaker. The actuator 66 is configured to interrupt an electric circuit 78 in at least one switching state. The electric circuit 78 illustrated by way of example comprises a first contact element 80 and a second contact element 82. The electric circuit 78 illustrated by way of example comprises a consumer 84 (for example, a motor vehicle electrical system) and a voltage source 86 (for example, an accumulator of a motor vehicle, in particular of an electric vehicle). In the case illustrated by way of example, the first contact element 82 is elastically resilient. The actuator 66 is configured to deflect (in the drawing of FIG. 1, pressing down) the first contact element 82 by an actuating element 56 of the actuator 66 in the operating state in which the electric circuit 78 is interrupted, so that the electrical contact with the second contact element 82 is disconnected and so that the voltage source 86 is disconnected from the consumer 84. The actuator 66 comprises a fast-acting actuator device 68.

[0048] FIG. 2 shows a schematic view of the fast-acting actuator device 68 with the housing unit 28 partially hidden. The actuator device 68 is formed as a circuit breaker device. The actuator device 68 has the housing unit 28. The housing unit 28 encloses the actuator device 68 to a large extent. The housing unit 28 comprises a removable cover element 90. The actuator device 68 comprises a mechanical tensioning element 10. The mechanical tensioning element 10 is formed as a spiral compression spring. The mechanical tensioning element 10 is supported with a first end 88 on the housing unit 28, in particular on the cover element 90, preferably on a spring seat of the housing unit 28 or of the cover element 90. Alternatively, the mechanical tensioning element 10 may also be supported on a component of the actuator device 68 other than the cover element for example on a magnetic core 100 of an electromagnet 26 of the actuator device 68 or on a magnetic-flux conducting element 102 of the electromagnet 26 of the actuator device 68. In this case, an increased overall stability can advantageously be achieved by a support on a metallic hard component instead of on a plastics component. The mechanical tensioning element 10 is arranged entirely inside the housing unit 28. The actuator device 68 has an armature element 12. The armature element 12 (with the exception of the actuating element 56, which may be formed integrally with the armature element 12) is arranged entirely inside the housing unit 28. The armature element 12 is formed as an injection-molded part. A second end 92 of the mechanical tensioning element 10 is supported on the armature element 12. The armature element 12 can be preloaded by the mechanical tensioning element 10, in particular in a first end position 14 (cf. FIG. 2 and FIG. 3). The armature element 12 is in the first end position 14 in the illustration of FIG. 2. The armature element 12 is driven to move from the first end position 14 into a second end position 16 of the armature element 12 (cf. FIG. 4) by a tension release of the mechanical tensioning element During a first actuating movement, the armature element 12 moves from the first end position 14 into the second end position 16. The first actuating movement is generated by a tension release of the mechanical tensioning element 10. The first positioning movement forms a fast positioning movement, in which a stroke 24 of at least 7 mm is swept over by the armature element 12 within at most 6 ms. The armature element 12 has a guide element 54, which is configured to receive and/or to guide the mechanical tensioning element 10. The guide element 54 is molded to the armature element 12 integrally. The mechanical tensioning element in particular the spiral compression spring, is wound around the guide element 54 section-wise. The guide element 54 (or alternatively another guide element) is further configured for guiding the movement of the armature element 12. The actuator device 68 has a guide rod 122. The armature element 12 is movable along a longitudinal direction of the guide rod 122 inside the housing unit 28. The guide element 54 surrounds the guide rod 122 at least section-wise. The actuator device 68 has the actuating element 56. The actuating element 56 is operatively connected to the armature element 12. The actuating element 56 is arranged on the armature element 12 on a side 58 of the armature element 12 opposite the mechanical tensioning element 10.

[0049] The actuator device 68 has a magnet unit 18 (see in particular also FIG. 3). The magnet unit 18 is configured to hold the armature element 12 in the first end position 14 by means of a magnetic field generated by the magnet unit 18. The magnet unit 18 is arranged entirely inside the housing unit 28. The magnet unit 18 is immovably fixed relative to the housing unit 28. The magnet unit 18 is fixed to the cover element 90. Alternatively, the magnet unit 18 may be arranged and/or fixed to a component of the actuator device 68 other than the cover element 90, for example to the magnet core 100 or to the magnetic-flux conducting element 102. The magnet unit 18 comprises the electromagnet 26. The electromagnet 26 is arranged entirely inside the housing unit 28. The electromagnet 26 is arranged laterally adjacent to the mechanical tensioning element 10 with respect to an expansion direction 30 of the mechanical tensioning element 10. The electromagnet 26 has a coil winding 96 (shown only schematically). The electromagnet 26 has a coil former 98. The coil winding 96 is wound around the coil former 98. The electromagnet 26 has the magnetic core 100 disposed in an interior of the coil former 98. In the activated state, i.e. in the energized state, the electromagnet 26 is configured to exert an attractive force effect on at least a part of the armature element 12 for fixing the armature element 12 in the first end position 14. The actuator device 68 has a magnetic element 46. The magnetic element 46 is formed as a ferromagnetic plate, for example an iron plate. The magnetic element 46 is fixed to the armature element 12. The magnetic element 46 is latched in the armature element 12 by latching elements 94 of the armature element 12. In the activated state, the electromagnet 26 is configured to exert an attracting force effect on the magnetic element 46 for fixing the armature element 12 in the first end position 14. The electromagnet 26 comprises the bow-shaped magnetic-flux conducting element 102 open in the direction of the magnet element 46.

[0050] The actuator device 68 has a resetting unit 20. The resetting unit 20 is configured to move the armature element 12 back from the second end position 16 to the first end position 14. The resetting unit 20 is configured to bias the mechanical tensioning element 10 when the armature element 12 is moved towards the second end position 16. The second actuating movement generated by the resetting unit 20 for resetting the mechanical tensioning element 10, in which the armature element 12 moves back from the second end position 16 to the first end position 14, is at least 40 times slower than the first actuating movement, in which the armature element 12 moves from the first end position 14 to the second end position 16 driven by the mechanical tensioning element 10. A switching time of the second actuating movement is longer than 200 ms. The resetting unit 20 has a resetting element 22.

[0051] The resetting element 22 is motor-drivable. The motor-drivable resetting element 22 is formed as a gearwheel 36. The gearwheel 36 has an axis of rotation 106 (cf. also FIG. 5), which is oriented perpendicular to a main direction of movement 108 of the armature element 12. The main direction of movement 108 of the armature element 12 is parallel to the expansion direction 30 of the mechanical tensioning element 10. The resetting element 22 comprises a driver element 32. The driver element 32 is supported so as to be movable relative to the housing unit 28. The driver element 32 is configured to contact the armature element 12 during a positioning movement by the resetting unit 20. The driver element 32 is arranged on a side face 34 of the gearwheel 36. The driver element 32 is arranged off-center on the side face 34 of the gearwheel 36. The driver element 32 follows a movement of the gearwheel 36, and the driver element 32 is configured to drive the armature element 12 along at least 120 of a monotonic rotational movement of the gearwheel 36. The driver element 32 is configured to entrain the armature element 12 over at most 170 of a monotonic rotational movement of the gearwheel 36. The driver element 32 is formed as a kind of pin, which protrudes beyond the side face 34 of the gearwheel 36. The driving element 32 is formed as a kind of pin, which protrudes in the direction of the electromagnet 26 beyond the side face 34 of the gearwheel 36. The resetting element 22 has an axle element 110. The gearwheel 36 is supported so as to be rotatable about the axle element 110. The axle element 110 is, in turn, supported in/on the housing unit 28 in a positionally fixed manner. Alternatively, the axle element 110 may also be supported on a component of the actuator device 68 that is different from the housing unit 28, for example on the magnetic core 100 and/or the magnetic-flux conducting element 102. The driver element 32 is configured to release the armature element 12 following an entrainment of the armature element 12, by a rotational movement of the gearwheel 36, in particular by a continuation of the rotational movement of the gearwheel 36 generating the entrainment. When the armature element 12 is fixed in the first end position 14, the driver element 32, in particular the gearwheel 36, is rotated into a release position (cf. also FIG. 3).

[0052] The actuator device 68 has an electric motor 60. The electric motor 60 is configured to generate the drive force for moving the motor-drivable resetting element 22. The electric motor 60 is arranged entirely inside the housing unit 28. The electric motor 60 has an output 104. The output 104 has an axis of rotation 112. The axis of rotation 112 of the output 104 and the axis of rotation 106 of the gearwheel 36 extend in directions perpendicular to each other. The actuator device 68 has a worm gear 62. The worm gear 62 is configured to transmit the drive force of the electric motor 60 to the resetting element 22. The worm gear 62 has a gear ratio. The worm gear 62 comprises a worm shaft 114. The worm gear 62 comprises the gearwheel 36. The worm shaft 114 meshes with the gearwheel 36 to transmit drive energy and to change the orientation of the driven axis of rotation 106, 112.

[0053] The electric motor 60 is configured to generate a reverse rotation opposite to the reverse rotation direction used to return the armature element 12 from the second end position 16 to the first end position 14. The reverse rotation of the electric motor 60, in particular of the output 104, is configured for a controlled (slow) transfer of the armature element 12 from the first end position 14 to the second end position 16. The reverse rotation of the electric motor 60, in particular of the output 104, is configured for a transfer of the armature element 12 from the first end position 14 to the second end position 16, guided by the driver element 32. The resetting unit 20 is configured to control, by means of the backward rotation of the electric motor 60, as an alternative to the first actuating movement proceeding independently of the resetting unit 20, a third actuating movement in which the armature element 12 moves from the first end position 14 to the second end position 16 at least 40 times slower than in the first actuating movement proceeding independently of the resetting unit 20.

[0054] The actuator device 68 has a sensor unit 64. The sensor unit 64 is configured to detect and/or monitor a state and/or a movement of the armature element 12. The sensor unit 64 has a first sensor 116. The sensor unit 64 is configured to detect and/or monitor, by means of the first sensor 116, a motor current of the electric motor 60 of the resetting unit 20 for determining a reset time of the resetting unit within which the armature element 12 is brought from the second end position 16 to the first end position 14, for determining a current position of the driver element 32, and/or for determining a travel path of the driver element 32. The first sensor 116 is formed at least partially integrally with the electric motor 60 or with a control unit (not shown) for controlling the electric motor 60.

[0055] The sensor unit 64 has a second sensor 118. The sensor unit 64 has a Hall sensor. The second sensor 118 is formed as the Hall sensor. The second sensor 118 is configured to detect and/or monitor a movement at least of a portion of the resetting element 22 for determining the reset time of the resetting unit 20, the current position of the driver element 32, and/or the travel path of the driver element 32. In the exemplary case shown, the driver element 32 is partially formed as a permanent magnet. The second sensor 118 is configured to detect the magnetic field of the permanent magnet of the driver element 32 and to determine a position and/or a movement of the driver element 32 based on the currently detected magnetic field strength and/or the currently detected magnetic field direction of the magnetic field of the permanent magnet of the driver element 32.

[0056] The sensor unit 64 has a third sensor 120 (cf. FIG. 3). The third sensor 120 is configured to detect a transfer position of the resetting unit 20, in which the armature element 12 is transferred to the magnet unit 18 after being reset by the resetting unit 20. The third sensor 120 is configured to detect an induction signal for identifying the transfer position. In general, it is conceivable that two or more than two sensors 116, 118, 120 of the sensor unit 64 are formed at least partially integrally with each other. The third sensor 120 is formed integrally with the electromagnet 26. In the electromagnet 26, the induction signal is generated when the armature element 12 approaches the electromagnet 26. A control unit (not shown) of the electromagnet 26 is configured to read the induction signal from the electromagnet 26.

[0057] FIG. 6 shows a schematic perspective view of the armature element 12. The armature element 12 has a contact element 38. The contact element 38 is configured to receive a force exerted by the driver element 32 on the armature element 12. The contact element 38 is configured to be swept over by the driver element 32 during the second actuating movement by the resetting unit 20. The armature element 12 has a first armature sub-element 40 and a second armature sub-element 42 connected to the first armature sub-element 40. The two armature sub-elements 40, 42 have a plate-like extent for the most part. The second armature sub-element 42 is arranged perpendicular to the first armature sub-element 40. The contact element 38 is arranged on the first armature sub-element 40. The contact element 38 is formed as a lug projecting in a direction facing the gearwheel 36 beyond the remainder of the first armature sub-element 40. The second armature sub-element 42 forms a seat 44 for supporting the mechanical tensioning element 10. The second armature sub-element 42 comprises the guide element 54. The second armature sub-element 42 comprises the magnetic element 46, which is configured for interaction with the magnetic field of the magnet unit 18 by attraction. The second armature sub-element 42 has the latching elements 94. The seat 44 for supporting the mechanical tensioning element 10 and the magnetic element 46 are arranged on opposite sides 50, 52 of the first armature sub-element 40, as viewed relative to the first armature sub-element 40. The guide element 54 and the magnetic element 46 are disposed on opposite sides 50, 52 of the first armature sub-element 40 as viewed relative to the first armature sub-element 40. The actuator device 68 has a reinforcing element 48. The reinforcing element 48 is configured to support the first armature sub-element 40 against the second armature sub-element 42. The reinforcing element 48 is configured to support and reinforce the first armature sub-element 40 on the second armature sub-element 42, on a side 50 facing towards the seat 44 for supporting the mechanical tensioning element 10.

[0058] FIG. 7 shows a schematic flow diagram of a method with the fast-acting actuator device 68. In a tensioning step 70, the armature element 12 is moved by the motor-driven resetting element 22 into the first end position 14 held stable directly by the magnetic field. This closes the electric circuit 78 secured by the actuator 66. In the tensioning step 70, moreover, the mechanical tensioning element 10 supported on the armature element 12 is tensioned at the same time. In a further method step 72, the electromagnet 26 of the magnet unit 18 is activated. As a result, the armature element 12 is held in the first end position 14. In at least one further method step 124, the driver element 32 is removed from a path of movement of the armature element 12 by further rotation of the gearwheel 36. In a first tension-release step 74, the armature element 12 is released from the first end position 14. In the first tension-release step 74, the electromagnet 26 is deactivated. In the first tension-release step 74, the armature element 12 released from the first end position 14 is moved with an uncontrolled acceleration to the second end position 16 by the mechanical tensioning element 10. In the first tension-release step 74, the armature element 12 is moved at least 7 mm in at most 6 ms. In the first tension-release step 74, the movement of the armature element 12 opens the electric circuit 78 secured by the actuator 66. In the first tension-release step 74, the electric circuit 78 is opened abruptly before any (thermal) damage can occur or an electric shock can be triggered. The first tension-release step 74 is configured for emergency actuation of the fast-acting actuator device 68. In a second tension-release step 76, alternative to the first tension-release step 74, the armature element 12 is released from the first end position 14. In the second tension-release step 76, the electromagnet 26 is deactivated. In the second tension-release step 76, the armature element 12 released from the first end position 14 is moved to the second end position 16 by the mechanical tensioning element 10 with an acceleration controlled by the resetting unit 20. In the second tension-release step 76, the armature element 12 is moved at least 7 mm in at least 200 ms. In the second tension-release step 76, the movement of the armature element 12 opens the electric circuit 78 secured by the actuator 66 in a controlled manner. The second tension-release step 76 is configured for a regular actuation of the fast-acting actuator device 68.

REFERENCE SIGNS

[0059] 10 mechanical tensioning element [0060] 12 armature element [0061] 14 first end position [0062] 16 second end position [0063] 18 magnet unit [0064] 20 resetting unit [0065] 22 resetting element [0066] 24 stroke [0067] 26 electromagnet [0068] 28 housing unit [0069] 30 expansion direction [0070] 32 driver element [0071] 34 side face [0072] 36 gearwheel [0073] 38 contact element [0074] 40 first armature sub-element [0075] 42 second armature sub-element [0076] 44 seat [0077] 46 magnetic element [0078] 48 reinforcing element [0079] 50 side [0080] 52 side [0081] 54 guide element [0082] 56 actuating element [0083] 58 side [0084] 60 electric motor [0085] 62 worm gear [0086] 64 sensor unit [0087] 66 actuator [0088] 68 actuator device [0089] 70 tensioning step [0090] 72 method step [0091] 74 first tension-release step [0092] 76 second tension-release step [0093] 78 electric circuit [0094] 80 first contact element [0095] 82 second contact element [0096] 84 consumer [0097] 86 voltage source [0098] 88 first end [0099] 90 cover element [0100] 92 second end [0101] 94 latching element [0102] 96 coil winding [0103] 98 coil former [0104] 100 magnet core [0105] 102 magnetic-flux conducting element [0106] 104 output [0107] 106 rotation axis [0108] 108 main direction of movement [0109] 110 axle element [0110] 112 rotation axis [0111] 114 worm shaft [0112] 116 first sensor [0113] 118 second sensor [0114] 120 third sensor [0115] 122 guide rod [0116] 124 method step