SENSORS & SENSING SYSTEMS ANALOG DEVICES
Figure 6 – Wire draw encoder applications
DESIGN The top-level block diagram of the ADMT4000, shown in Figure 2, combines the earlier described GMR multiturn sensor with a highly accurate AMR angle sensor and integrated signal conditioning IC to provide a solution that is capable of recording 46 turns or 16,560° of movement with a typical accuracy of ±0.25°. The integrated signal conditioning IC enables
further system enhancements to support harmonic calibration, which can remove errors due to magnetic and mechanical tolerances from the application. The ADMT4000 provides absolute 46 turn (0° to 16,560°) digital output via an SPI or SENT interface. The ADMT4000 is positioned opposite a dipole magnet mounted to the rotating shaft as depicted in Figure 3. ADI is preparing a magnetic reference design that will enable users with little or no magnetic design capability to easily adopt the ADMT4000 in their application. In addition to the core magnet design, this reference design will also provide which will allow customers to implement the sensor in harsh environments. sources where currents are carried in a wire, in particular, when used in close proximity to electric motors or actuators. ADMT4000 capabilities are valuable in many
industrial applications including robot and cobot arm joint position tracking in the event of a power outage or during power-down (see Figure 4). Other industrial applications include the absolute and TPO tracking of x-y tables in industrial automation, machine tools or medical
20 February 2025 Irish Manufacturing
Figure 7 – a steer-by-wire application
equipment applications (shown in Figure 5). Other rotary to linear applications include, but are not limited to the turn counting of coils, drums, spools, reels, hoists, winches, and lifts (Figure 6) when powered or movement tracking when powered down or during power outages. Additionally, TPO position sensing provided
automotive applications including, but not limited to, transmission actuators (Figure 5), electrical power steering (EPS) including steer-by-wire (Figure 7), parking lock actuators, other general-purpose actuators, and seat belt retractors (Figure 8). The size, cost, and operating temperature range
of the ADMT4000 enable its use in a wide range of applications including safety critical applications in the automotive and industrial space. Automotive safety critical applications are compliant to the ISO 26262 standard and a particular automotive safety integrity level (ASIL). The ADMT4000 will be supplied as either ASIL-QM or ASIL-B(D) to suit applications that do and don’t need the advanced ASIL or SIL functionality.
Figure 8 – a seat belt retractor application
CONCLUSION reduce system design complexity and effort, ultimately resulting in smaller, lighter, and lower cost solutions. The ease of use of the ADMT4000 will enable designers with and without magnetic design capability to add new and improved functionality to current applications and open the door to many new applications. the magnetic reference design, please contact your local ADI sales team who will be happy to discuss your requirements and applications or visit
analog.com/magnetics.
Analog Devices
www.analog.com
www.irish-manufacturing.com
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