In this particular case, there are several N42 magnets available from prior projects. As the desired transition region is where the magnet surface is at least 12mm (10mm + 2mm) away from the sensor, we try an initial design with one of our larger magnets (3/8" × 3/16" × 3/16"). Figure 8-8 shows the respective curve for this magnet along the movement along with the magnetic thresholds of the TMAG5131C1DQDBZRQ1.

While the B_z magnitude adequately exceeds the B_OPMAX, the B_z does not quite reach the B_RPMIN. Therefore, the user must make some adjustments so that B_z falls below B_RPMIN within the desired operating range. To reduce B_z, there are a few options. The user can offset the magnet or choose a smaller magnet. After iterating through increasing x-offsets and y-offsets as well as decreasing magnet thicknesses, the user can eventually find a solution that works. In this case, a 3/8" × 3/16" × 1/16" N42 magnet with no x or y offset from the sensor center is used. Figure 8-9 and Figure 8-10 shows the curves corresponding to the final magnet parameters.