US 5,497,135 A · Bistable electromagnet, particularly an electromagnetic valve

Abstract

A bistable electromagnet is moved from one operating position into the other by a short direct-current pulse, the next pulse following in each case having the opposite current direction. The essential factor in this is a permanent magnet which is arranged in the core area and which holds the armature against the action of an armature spring in one operating position. An electromagnet constructed in this manner can be produced without tolerance calibration and requires less control power when the permanent magnet is carried freely movably between two end positions in the direction of armature movement in a hollow space of the coil core. The coil core can be constructed as a pot, at the bottom of which the permanent magnet is magnetically held whilst the permanent magnet is held in the other end position by a stop in such a manner that its side facing the armature is approximately flush with the edge of the pot.

Claims18

Dependent claims

A bistable electromagnet, comprising:

a yoke;
a coil connected to said yoke and having a interior region;
an element located within the interior region of said coil and defining a hollow space therein;
an armature at least partially located within the interior region of said coil and being movable between two operating positions;
a spring acting upon said armature;
and
a permanent magnet arranged in the hollow space of said element and holding said armature against a force of said spring in one of the operating positions, said permanent magnet being freely movable between two end positions in the hollow space in a direction of movement of said armature.

4 more elements

Dependencies are inferred from the claim text.

Bistable electromagnet, particularly an electromagnetic valve

Life of this patent

Bistable electromagnet, particularly an electromagnetic valve

Life of this patent

Abstract

Claims18