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ADMT4000 Design, Implementation, and Applications Chapter 6 In a high-speed bottling plant, precision and uptime are paramount. Rotary actuators control the capping mechanisms, ensuring each bottle is sealed correctly. However, unexpected power outages previously led to misaligned caps and production halts, as traditional systems lost track of their position. By integrating Analog Devices' ADMT4000 multi-turn position sensors into the rotary actuators, the plant now maintains precise positional data even during power interruptions. This advancement eliminates the need for manual recalibration, reduces downtime, and ensures consistent product quality, showcasing the ADMT4000's pivotal role in enhancing industrial automation reliability. Rotary actuators play a crucial role in various applications, ranging from robotics to humanoid joints. These actuators often utilize gearing to increase torque, enabling the motor on the input side to complete multiple rotations. Recent advancements in rotary actuator technology include the ADMT4000 sensor, which features next-generation improvements in multi-turn sensing. Domain Wall Generation Technology Determining the output angle in a rotary actuator with gearing is a challenge that has led to various approaches. One method involves placing a single- turn sensor on the output side, while another option is to add a battery and memory chip on the input side, eliminating the need for an output sensor or a Wiegand wire solution with an FRAM chip. However, these solutions can be complex and add unnecessary weight to the system. The ADMT4000 sensor, introduced to the market in November of 2024, offers simplified rotary actuators. By placing the single sensor chip opposite a dipole magnet rotating on the motor shaft, the sensor's 360-degree capability can serve dual purposes. It acts as a motor commutation sensor for brushless motors and an absolute multi-turn position sensor, providing the output angle. This design simplifies actuator construction, reduces overall solution costs, and decreases the system's weight. Sensor Operation Principles The ADMT4000 sensor's technology enables movement detection without power or contact, relying on the principle of shape anisotropy. The sensor consists of two core structures: a domain wall generator with low-shape anisotropy and a narrow magnetic nanowire track with high-shape anisotropy. 17 Engineering Reliable Industrial Automation With Sensor Fusion