Actuator
AssigneeRobert Bosch GmbH
InventorsErwin Krimmer, Wolfgang Schulz, Christian Lorenz, Matthias Brendle
Life of this patent
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Abstract
An actuator of the prior art has an iron circuit comprising three parts. Moreover, an armature stroke with a magnetic force that remains constant over wide strokes can be achieved only at very great effort and expense. An actuator (1) of the invention has two parts in the iron circuit and has a simple construction. A short-circuit element (3) has an offset (90), which depending on the position of an armature (9) varies the course (60) of magnetic flux in such a way that over the entire stroke, a constant, high magnetic force is achieved, and thus a shallow course of magnetic force in stroke is attained.
Claims12
An actuator, in particular for a valve or a relay, comprising at least
- an electrical coil,
- a magnetic short-circuit element for the coil, and an armature which is disposed at least partly in the coil,
- characterized in that
- the armature (9) is movable in an axial direction (18) between two terminal positions;
- the course of magnetic flux in a first terminal position extends from the armature (9) primarily through a face on a first end (63) of the short-circuit element (3), to which the axial direction (18) is perpendicular;
- and
- the course of magnetic flux in a second terminal position of the armature (9) extends primarily through a face on the first end (63) of the short-circuit element (3) that extends parallel to the axial direction (18).
Dependencies are inferred from the claim text.