3 Summary

As was shown with the calibration results above, there are several options available to optimize the placement of each 3D Hall-effect sensor for long observable stroke distance. To get the highest quality results, a magnet which is strong enough to use most of the linear input range of the sensor is beneficial, and a wider magnet can produce a longer sensing range. In cases where air gap distance is minimized, use a thicker magnet to reduce distortion that can result near the corners of the magnet.

Implemented correctly, 3D Hall-effect sensors offer an increased sensing range by approximately 2x and as demonstrated in Figure 2-10 a linearity error of 10 μm is attainable. Maximizing the sensing range is critical to reducing the total number of sensors required in any linear position sensing application. Additionally, reducing linearity error is critical for precise control required for automated systems like linear motor transport systems to achieve quality and highly repeatable performance for manufacturing and assembly.