| 摘要 |
An electromagnet is proposed which serves in particular to actuate a fuel injection valve for fuel injection systems in internal combustion engines. The electromagnet includes a first pole piece disposed at one side of a first permanent magnet and a second pole piece disposed at the other side of the first permanent magnet. The pole pieces each have one conduction section bent at an angle, which sections are oriented toward one another and define a gap therebetween. Divided from the first permanent magnet by the conduction sections, a magnet coil is disposed on each pole piece. The first pole piece has a pole oriented toward the armature, and the second pole piece has a pole. When the magnet coils are not excited, the armature is drawn in the direction toward the poles by one component ( phi p2) of the permanent magnetic flux. If the magnet coils experience a flow through them of a current (i) in such a manner that an electromagnetic flux ( phi i) flows through the armature in the opposite direction from the flux ( phi p2), then the armature drops away from the poles whenever the electromagnetic flux ( phi i ) becomes equal to the component ( phi p2) of the permanent magnetic flux. |
