Control device for an electromagnet

摘要

The magnetically influenced switch device (5) contains a sensor coil (22) with at least one winding coupled to at least part of the electromagnet's magnetic field at least when an air gap is open. The sensor coil is switched over to a controlled semiconductor (11) connected in series with a pull-in coil (1) of the electromagnet, which also has a hold-in coil, by a voltage peak which occurs at the instant of air gap closure. The sensor coil is changed over by an electronic switching device. It takes the form of at least one winding mounted at any point around the core and/or the armature. It can be mounted near the air gap and core and/or the armature and is coupled to the stray field of the electromagnet about the air gap.