| 摘要 |
<p>An electromagnetic switching device in order to produce rapid switching operations. The air gap between the two pole pieces (10, 11) of an electromagnetic (12) contains a permanent magnet (17). Facing the permanent magnet (17) is an armature (18) which is free to move in the outer air gap (19). The permanent magnet (17) reinforces the force exerted on the armature (18) after the electromagnet (12) has been switched on. During switching-off of the electromagnet (12) the magnetic field (23) of the permanent magnet (17) accelerates the decrease in the magnetic field and thereby also the reduction in force exerted on the armature (18). The electromagnetic switching device is particularly suited to producing rapid switching operations. It is especially appropriate for use in fuel injection valves in an internal combustion engine.</p> |
