Key element for the control of electromotors, especially for cranes and other hoisting equipment

摘要

A key element for the control of electromotors, especially for cranes and other hoisting equipment. The key element includes a key switch pestle, a permanent magnet attached to the key switch pestle and a Hall sensor. The key switch pestle and permanent magnet are moveable both towards and away from the Hall sensor. As the permanent magnet approaches the Hall sensor, a flux density is sensed which triggers the generation of a control signal. In order to create a key element which can be installed in the smallest possible space, in controls and the like, the electronic circuit which includes a permanent magnet positionable toward the Hall sensor is integrated into the key element housing.