Operation procedure monitoring device for e.g. house-hold dishwasher, has magnets producing hall-voltages of different polarities depending on magnetic pole orientations during rotation of arm, and trigger detecting field direction change

摘要

The device has a spray arm (3) rotatably supported around an axis of rotation (4), where the arm has permanent magnets (7, 8) for generating magnetic fields. North and south poles of the magnets are arranged perpendicular to a rotation direction of the arm, and a detection device (10) has a hall-sensor with a Schmitt-trigger. The magnets produce hall-voltages of different polarities depending on different orientations of the poles during the rotation of the arm. The trigger detects the direction change of the magnetic field, and applies a high and/or low signal at an output of the trigger.