CPCI-680 Magnetic Design of Giant Magnet Resistance Multi coil Position Sensor

Multi turn sensors essentially combine magnetic write and electronic read memory with traditional magnetic angle sensors to provide high-precision absolute positions. The magnetic writing process described in “Multi turn Position Sensor (TPO) with true power on capability and zero power consumption” requires the use of specific operating windows to maintain the incident magnetic field. If the magnetic field is too high or too low, magnetic write errors may occur. When designing system magnets, caution and consideration must be given to any stray magnetic fields that may interfere with the sensor, as well as mechanical tolerances throughout the product’s lifespan. A smaller stray magnetic field may lead to measurement angle errors, while a larger stray magnetic field may cause magnetic writing errors, resulting in total number of turns errors.
Designing ideal magnets and shielding requires careful understanding of system requirements. Generally speaking, the looser the system requirements, the larger the size and higher the cost of the magnet solution required to achieve the target specifications. ADI is developing a series of magnetic reference designs that meet various mechanical, stray field, and temperature requirements, which can be used by customers of ADMT4000 truly powered multi turn sensors. The first design developed by ADI covered systems with relatively loose tolerances: the distance from the sensor to the magnet was 2.45 mm ± 1 mm, the total displacement from the sensor to the rotation axis was ± 0.6 mm, and the operating temperature range was -40 mm ˚ C to+150 ˚ C. The shielding attenuation of stray magnetic fields is greater than 90%.
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