ELECTROMAGNETIC ACTUATOR DEVICE

• US 20140062628A1
• Filed: 08/28/2013
• Published: 03/06/2014
• Est. Priority Date: 08/28/2012
• Status: Active Grant

• Current Assignee: ETO Magnetic GmbH (Christa Und Hermann Laur-Stiftung)
• Original Assignee: ETO Magnetic GmbH (Christa Und Hermann Laur-Stiftung)
• Inventors: Buerssner, Joerg, Fangauer, Philipp
• Granted Patent: US 9,607,746 B2
• Time in Patent Office: Days
• US Class Current: 335/229
• CPC Class Codes: F01L 2820/031 Electromagnets
• CPC Class Codes: H01F 7/08 with armatures
• CPC Class Codes: H01F 7/1615 Armatures or stationary parts of magnetic circuit having permanent magnet
• CPC Class Codes: H01F 7/1638 Armatures not entering the winding

Abstract

An electromagnetic actuator device has a coil unit (28, 58) enclosing a first yoke section (16, 56) of a stationary yoke unit (10, 54), an armature unit (14, 64) movably guided relative to the yoke unit (10, 54), by energisation to interact with a positioning partner on the output side of the armature unit (14, 64) and permanent magnetic agents (22, 36, 68) coupled into a magnetic flux circuit of the yoke unit (10, 54) wherein de-energisation of the coil unit (28, 58) a permanent magnetic flux circuit through the yoke unit (10, 54) and a section of the armature unit (14, 64) that is free of permanent magnetic flux and energisation displaces the permanent magnetic flux, out of the section, wherein the armature unit (14), by spring force is pre-loaded in a direction opposed to permanent magnetic retaining force of the armature unit (14, 64) and the positioning partner is a combustion engine unit.

Claims

1. An electromagnetic actuator device with a coil unit (28, 58) enclosing a first yoke section (16, 56) of a stationary yoke unit (10, 54), which coil unit can be activated by means of energisation, an armature unit (14, 64) that can be movably guided relative to the yoke unit (10, 54), which as a reaction to the energisation can be moved for purposes of interacting with a positioning partner that can be provided on the output side of the armature unit (14, 64) and the permanent magnetic agents (22, 36, 68) assigned to the yoke unit (10, 54), which are designed and coupled into a magnetic flux circuit of the yoke unit (10, 54) such that in a de-energised state of the coil unit (28, 58) a permanent magnetic flux circuit through the yoke unit (10, 54), and a section of the armature unit (14, 64) that is free of permanent magnetic flux, are closed, and as a reaction to the energisation the permanent magnetic flux is displaced out of the section, wherein the armature unit (14) by means of a spring force from spring agents acting on the armature unit (14, 64) is pre-loaded in a direction of movement opposed to a permanent magnetic retaining force of the armature unit (14, 64) on the yoke unit (10, 54) and the armature unit (14, 64) of an extended design in the form of a tappet is designed so as to interact with a combustion engine unit as a positioning partner.

2. The device in accordance with claim 1, wherein the combustion engine unit is a camshaft adjustment unit.

3. The device in accordance with claim 1, wherein the permanent magnetic agents (22, 36, 68) are integrated on the cover side and/or front face into a housing of hollow cylindrical shape, at least in some sections, that implements the yoke unit (10, 54), the central axis of which runs axially with or parallel to a longitudinal axis of the armature unit (14, 64), or is integrated into a yoke frame implementing the yoke unit.

4. The device in accordance with claim 3, wherein the yoke unit is designed such that the first yoke section runs parallel to the longitudinal axis of the armature unit.

5. The device in accordance with claim 3, wherein the permanent magnetic agents (22, 36, 68) are designed as cylindrical bodies or a cylindrical section of a permanent magnetic material, and are integrated into the cylindrical wall of the housing in a flux-conducting manner, and/or wherein the permanent magnetic agents (22, 36, 68) are designed as a disk or a disk section of a permanent magnetic material, and are integrated into a front face of the housing in a flux-conducting manner.

6. The device in accordance with claim 1, wherein the permanent magnetic agents (22, 36, 68) are designed as a rod-shaped and/or a strip-shaped body of a permanent magnetic material.

7. The device in accordance with claim 1, wherein the flux-conducting agents are assigned so as to be adjacent to the permanent magnetic agents (22, 36, 68) and with the formation of an air gap (12, 26, 52, 62, 66, 74, 76).

8. The device in accordance with claim 1 wherein the first yoke section (16, 56) is aligned axially or orthogonally relative to the armature unit (14, 64), with the formation of an intermediate air gap (12, 26, 52, 62, 66, 74, 76).

9. The device in accordance with claim 1, wherein the agents assigned to the coil unit (28, 58) for purposes of adjustment to the energisation, which are designed such that in a first energisation polarity the displacement of the permanent magnetic flux (30, 30′

) from the section of the armature unit (14, 64) takes place and in an opposing second energisation polarity the magnetic flux direction of the permanent magnetic flux runs in the same direction as an electromagnetic flux (40) generated by the energised coil unit (28, 58).

10. The device in accordance with claim 9, wherein the agents assigned to the coil unit adjust the energization by reversing polarity.

11. The device in accordance with claim 1, wherein the agents for the adjustment of the energisation are designed such that in the second energisation polarity a summation of the permanent magnetic and electromagnetic attractive forces acting on the armature unit (14, 64) exceeds the spring force in the position in which the armature unit (14, 64) is released from the yoke unit (10, 54).

12. The device in accordance with claims 1, wherein the coil unit (28, 58) is implemented as a multiplicity of individual coils provided on the sections of the yoke unit (10, 54) and electrically connected together.

13. A combustion engine unit adjustment device, in particular a camshaft adjustment device having a positioning partner assigned to a camshaft, in particular a tappet unit engaging with a positioning groove, which is implemented as an armature unit (14, 64) of the electromagnetic actuator device in accordance with claim 1, or interacts with this armature unit (14, 64), wherein the armature unit (14) is driven by the electromagnetic actuator device in accordance with claim 1.