SENSORS & SENSING SYSTEMS  ANALOG DEVICES


Figure 3 – the ADMT4000 typical application assembly


shorter maintenance cycle where the batteries must be replaced more frequently. An alternative to battery backup is the use of Wiegand wire energy harvesting modules. These modules make use of a specially treated wire where the magnetic coercivity of the outer shell is much higher than the coercivity of the inner core. The different coercivities create voltage  is rotated. The spikes can be used to power external


circuitry and record the number of turns in a ferroelectric random-access memory (FRAM). The magnetic multiturn memory that has been developed by Analog Devices requires no external power to record the number of rotations  reduced system size and cost.


MULTITURN SENSOR TECHNOLOGY At the core of the magnetic multiturn sensor is a spiral of giant magnetoresistance (GMR) material made up of multiple nanowires of GMR elements. The operating principle of the sensor is based on shape anisotropy and the generation of domain walls in a domain wall generator in   walls propagate through the narrow spiral


Figure 4 – the ADMT4000 in a robot/cobot application


tracks (nanowires) attached to the domain wall  As the domain walls move through the spiral


  changes. Since the elements are fabricated  be determined by measuring their resistance. The sensor relies only on the external magnetic  harvesting technique is needed for the turn counting operation.  reading of the turn count state is available with no further user actions or system resetting required.


Figure 5 – the ADMT4000 in a rotary to linear actuator application 18 February 2025 Irish Manufacturing


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