DC Tachogenerators are used as speed monitoring devices, they convert rotating movement (RPM) into a proportional DC voltage with almost nil propagation delay and have no need for an energy supply.
They are most often used when mounted on to the back of a DC Motor and supply the connected DC drive with a voltage that is linear to speed typically expressed as a voltage against speed e.g. 40V/1000RPM.
Part Number /0000048
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