US 9,312,058 B2Granted

Electromagnetic linear actuator

AssigneeMsm Krystall Gbr

InventorsRainer Michaelsen, Arno Mecklenburg, Rainer Schneider

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Abstract

An electromagnetic linear actuator has a frame (stator) and an armature each at least partially formed of soft magnetic material. The armature can be moved relative to the frame along a longitudinal axis, they form a gap therebetween in an open position and lie against each other in a closed position with the gap closed. A first armature coil is connected to the armature so that a force acting on the first armature coil is transferred to the armature. An excitation magnetic field is generated and guided at least partially by the frame and the armature and acts with a force on the first armature coil when current flows through the first armature coil, to close the gap. The frame, the armature, and the excitation magnetic field are configured so that a retaining force takes effect when the gap between the frame and the armature is closed.

Claims12

Dependent claims

An electromagnetic linear actuator, comprising:

a stator at least partially made of soft magnetic material;
an armature at least partially made of soft magnetic material and being supported on said stator for movement relative to said stator along a longitudinal axis, said armature and said stator forming a gap therebetween along the longitudinal axis in an open position and lying against one another in a closed position with said gap closed;
a first armature coil connected to said armature and configured to transmit a force acting on said first armature coil to said armature;
and
a second armature coil connected to said armature and configured to transmit a force acting on said second armature coil onto said armature;
a device for generating an excitation magnetic field guided at least partially by said stator and said armature and directed such that a force acts on said first armature coil when current flows therethrough and the force is transmitted to said armature in order to close said gap, said device for generating the excitation magnetic field including an excitation coil adjacent to, and associated with, said second armature coil and mechanically connected to said stator;
said stator, said armature and the excitation magnetic field being configured such that a retaining force can take effect when said gap between said stator and said armature is closed;
said second armature coil and said excitation coil associated therewith, upon excitation with a current, generating opposite magnetic fields that are superposed at least in the open position and thus form an excitation field with a field component oriented transversely to the longitudinal axis;
and
in an open position, said second armature coil and said excitation coil associated therewith being adjacently arranged such that, when said coils are excited with current, the field component oriented transversely to the longitudinal axis interacts in such a manner with said second armature coil that a force closing the gap acts on said second armature coil.

7 more elements

An electromagnetic linear actuator, comprising:

a stator at least partially made of soft magnetic material;
an armature at least partially made of soft magnetic material and being supported on said stator for movement relative to said stator along a longitudinal axis, said armature and said stator forming a gap therebetween along the longitudinal axis in an open position and lying against one another in a closed position with said gap closed;
wherein said stator is composed of a plurality of soft magnetic parts of which at least one is constructed as a tube in which said armature is guided;
an armature coil connected to said armature and configured to transmit a force acting on said armature coil to said armature;
and
a device for generating an excitation magnetic field guided at least partially by said stator and said armature and directed such that a force acts on said armature coil when current flows therethrough and the force is transmitted to said armature in order to close said gap;
said stator, said armature and the excitation magnetic field being configured such that a retaining force can take effect when said gap between said stator and said armature is closed;
at least one excitation coil fastened on said stator wound into a groove from outside onto a stator part constructed as a tube, which tube has such a thin wall in a vicinity of said winding that it can guide significantly less magnetic flux in the direction of the armature movement than said armature itself without saturating at least partially, and wherein said excitation coil wound onto said tube is surrounded with one or more other stator parts such that a closed magnetic circuit is formed with said tube whose magnetic path has a greater overall cross section than the minimal cross section of the wound tube, and that as a current grows in the excitation coil, in the absence of the armature at first the part of the tube wound with the excitation coil must therefore saturate.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/879,756Filed 6 Oct 2011
Priority: DE 10 2010 048 44716 Oct 2010
Published: US 2013/0200966 A18 Aug 2013
Granted: 12 Apr 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H01F 7/1805
Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for…:…
H01F 7/066
Electromagnets; Actuators including electromagnets: electromagnets with movable winding
H01F 7/1607
Rectilinearly-movable armatures: armatures entering the winding
H01F 7/122
Guiding or setting position of armatures, e.g. retaining armatures in their end position: by permanent magnets