Hall sensor—magnet geometry for large stroke linear position sensing

A position sensing unit, comprising:

• a magnetic assembly (MA) having a width W measured along a first direction and a height H measured along a second direction and including at least three magnets having respective magnetic polarizations that define along the first direction at least a left MA domain, a middle MA domain and a right MA domain, wherein the magnetic polarizations of each MA domain are different;
• and
• a magnetic flux measuring device (MFMD) for measuring a magnetic flux B,
• wherein the MA is configured to move relative to the MFMD along the first direction within a stroke L that fulfils 1 mm≤L≤5 mm, and wherein a minimum value Dmin of an orthogonal distance D measured along the second direction between a particular MA domain and the MFMD of the position sensing unit, fulfills L/Dmin>5,
• wherein the at least three magnets are positioned sequentially along the first direction, and wherein adjacent magnets are separated by a gap;
• wherein the magnetic polarization of the left MA domain is directed opposite than the magnetic polarization of the right MA domain, and the magnetic polarization of the middle MA domain is directed parallel or anti-parallel to the first direction.