Sensor for detecting movement of machine part - has row of ferromagnetic teeth detected by Hall sensor with evaluation circuit contg. operational amplifier, comparator and end stage generating control signal

摘要

A sensor arrangement for detecting the movement of a machine part has a row of ferromagnetic teeth and a Hall generator responding to the presence or absence of teeth. The Hall generator is connected to an evaluation circuit contg. an operational amplifier (IV1), a comparator (IV2) and an end stage generating at least one control signal. The output of the operational amplifier is connected directly to one comparator input. The other comparator input is connected via a low-pass RC element (R14, C5) influenced transiently by a charge circuit (R9-11, C4, T2) each time the sensor is activated. USE/ADVANTAGE - sensor is rapidly activated and noise influences such as temp. variations and component tolerances are automatically compensated.