The pair of opposing magnets produces a high field gradient. We could create such a region of high field gradient over each of the four outer hall effect sensors using a simple arrangement of square magnets (todo: make a drawing).
The pair of opposing magnets produces a high field gradient. We could create such a region of high field gradient over each of the four outer hall effect sensors using a simple arrangement of a central magnet with a surrounding annulus of opposite polarity. I EDM'ed a test arrangment out of a large neodymium magnet of 1/8" thickness. This went reasonably well, except for a small tab near the lead-in which was left due to the brittleness of the magnet material.
I put this magnet arrangement on my stage to test the resolution. I just grabbed the 8 bit X and Y values computed by the AS5013 and looked for the spatial range this mapped over. Below are some very preliminary plots of this data, having not changed many of the parameters for the calculations.
