Bistable electromagnet, particularly an electromagnetic valve

US5497135A · kind A · utility

Assignee

• Harald Schrott · DE

Inventors

• Michael Wisskirchen · Bad Wurzach, DE
• Bernd Geser · Günzburg, DE

Key dates

• Filing date: Nov 30, 1994
• Grant date: Mar 5, 1996
• Expiry date: Nov 30, 2014

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01F2007/1669
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

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.