Due to the complex non-linear behavior magnets and the number of variables that can influence it, some experimentation is required to solve for a design that will work. This application uses a simple axial, dipole, block magnet. Users can consider other shapes for different field strengths or prices. A neodymium type of magnet (N52) is used. At the time of this writing, N52 can be commonly found with heights of 1/16", 1/8", 3/16", and 1/4". As price often increases with size, the first design attempt will be with a 1/16" thick magnet, which has a width and length equal to 0.25". Based on the sensor distance from hinge origin and fixture dimension constraints, there is a lot of flexibility on where the sensor can be placed. Due to other hardware within the fixture, the TMAG5131C1DQDBZRQ1 sensor is placed 203.2mm (8") from the origin. From there, the user can assess a design with the following displacement dimensions.

Figure 8-8 shows that the b-field magnitude for the TMAG5131C1DQDBZRQ1 is not adequate for the spatial constraints of 5° and 15°, as the B_z magnitude only surpasses the B_RP minimum. There are a few options on how to proceed. As the B_OP(Max) does not fall within our range, the user must increase field strength. This can be accomplished with a thicker magnet or by adjusting sensor and magnet z-offsets. The magnet cannot get any closer due to enclosure constraints, therefore the only option allowed is to increase the magnet thickness. After a few more iterations with the tool, a 0.25" × 0.25" × 0.375" magnet can work (see Figure 8-5 and Figure 8-6).