# US 2017/0256348 A1 · Bistable electromagnetic actuator device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0256348 A1 - Document ID: US20170256348A1 - Status: Published application - Kind: A1 - Application number: 15/510,787 - Filed: 2015-09-17 - Published: 2017-09-07 - Earliest claimed: 2014-09-18 - Assignees: ETO Magnetic GmbH - Applicants: ETO Magnetic GmbH - Inventors: Oliver Thode; Jörg Bürssner - Web page: https://patentgrep.com/patent/US20170256348A1 ## CPC - H01F 7/122: by permanent magnets {(H01F7/1615, H01F7/1646 take precedence)} - H01F 7/1607: {Armatures entering the winding} - H01F 7/1615: {Armatures or stationary parts of magnetic circuit having permanent magnet} - H01F 7/1844: {Monitoring or fail-safe circuits (for relays H01H47/002)} - H01F 7/132: {Armatures actuated by current pulse, e.g. bistable actuators} - H01F 2007/1684: {Armature position measurement using coils} - H01F 2007/185: {with armature position measurement} - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A bistable electromagnetic actuator device, a permanent magnet means (12; 12a, 12b), as well as an armature unit (18) with an elongate plunger unit (10) extending along a moving direction, wherein said armature unit can be moved into at least one of two end and/or stop positions that are stable in the deenergized state by means of stationary electromagnetic driving means (22), wherein stationary magnetic field detector means (34; 34a, 34b) are assigned to a housing (20), which at least sectionally encloses the armature unit, for the contactless interaction with the permanent magnet means in at least one of the end or stop positions provided for the armature position detection, wherein the plunger unit features a terminal contact and/or engagement section (28) for interacting with an actuating partner in a contacting and non-positive fashion such that a non-positive contact and/or actuation by the actuating partner causes a motion of the armature unit into one of the end or stop positions, in which the armature unit remains in a stable fashion in the deenergized state, when the electromagnetic driving means are deactivated, and wherein the magnetic field detector means are arranged and wired for generating and outputting a detector signal corresponding to this end or stop position. ## Claims ### Claim 1 A bistable electromagnetic actuator device, a permanent magnet means (12; 12a, 12b), as well as an armature unit (18) with an elongate plunger unit (10) extending along a moving direction, wherein said armature unit can be moved into at least one of two end and/or stop positions that are stable in the deenergized state by means of stationary electromagnetic driving means (22), wherein stationary magnetic field detector means (34; 34a, 34b) are assigned to a housing (20), which at least sectionally encloses the armature unit, for the contactless interaction with the permanent magnet means in at least one of the end or stop positions provided for the armature position detection, wherein the plunger unit features a terminal contact and/or engagement section (28) for interacting with an actuating partner in a contacting and non-positive fashion such that a non-positive contact and/or actuation by the actuating partner causes a motion of the armature unit into one of the end or stop positions, in which the armature unit remains in a stable fashion in the deenergized state, when the electromagnetic driving means are deactivated, and wherein the magnetic field detector means are arranged and wired for generating and outputting a detector signal corresponding to this end or stop position. ### Claim 2 (depends on 1) The device according to claim 1, wherein the driving means are realized in the form of a stationary coil unit that is provided on or in the housing and assigned a stationary core unit, which forms a stopping face (26) for a stopping section of the armature unit, wherein the plunger unit (10) preferably extends into the core unit or through this core unit in a guided fashion. ### Claim 3 (depends on 2) The device according to claim 2, wherein the permanent magnet means are realized in the form of disk-shaped permanent magnet bodies (12; 12a, 12b), which are provided on the plunger unit axially on both ends of the core and/or coil unit and designed in such a way that one of the permanent magnet bodies respectively contacts the core or coil unit while the other permanent magnet body is axially spaced apart from the core or coil unit in the two end or stop positions. ### Claim 4 (depends on 1) The device according to claim 1, wherein the magnetic field detector means are semiconductor-based and/or realized by means of a detector coil and provided on the magnetically conductive housing in such a way that the housing is detection-effectively permeable to the permanent magnetic field of the permanent magnet means in the end or stop positions provided for the armature position detection, wherein the housing features a housing aperture, a housing opening and/or a housing section, which at least sectionally is magnetically non-conductive for this purpose. ### Claim 5 (depends on 3) The device according to claim 3, wherein the magnetic field detector means are provided axially on both ends of the core or coil unit. ### Claim 6 (depends on 1) The device according to claim 1, wherein the magnetic field detector means are provided on one end of the stationary driving means, such that a plurality of positions of the armature unit preferably can be detected by an assigned plurality of detector elements of the magnetic field detector means. ### Claim 7 (depends on 1) The device according to claim 1, wherein the contact and/or engagement section is designed for producing a mechanical contact and/or connection with the actuating partner, which can be effectively subjected to pressure and/or tension in or opposite to the moving direction. ### Claim 8 (depends on 7) The device according to claim 7, wherein the contact and/or engagement section features or forms a mechanical coupling, a thread section, a peripheral groove, an undercut and/or a probe head. ### Claim 9 (depends on 1) The device according to claim 1, wherein energy accumulator means (44) are assigned to the armature unit in order to generate a counterforce that acts opposite to the contact or actuation by the actuating partner, wherein said energy accumulator means are realized in the form of a flat coil spring and/or pressure spring arranged concentric to the plunger unit. ### Claim 10 (depends on 1) A utilization of the bistable electromagnetic actuator device according to claim 1 as a motion and/or position sensor for the actuating partner and/or for detecting a motion or change in position of the actuating partner. ### Claim 11 (depends on 10) The utilization according to claim 10, wherein a position of the armature unit actuated by the actuating partner in the deenergized state is stored. ### Claim 12 (depends on 1) A system consisting of an actuating partner to be evaluated or to be monitored for the position and/or motion detection and the device according to claim 1.