US 11,946,775 B2
Hall sensor—magnet geometry for large stroke linear position sensing
Yiftah Kowal, Tel Aviv (IL); Nadav Goulinski, Tel Aviv (IL); Tal Korman, Tel Aviv (IL); and Ephraim Goldenberg, Tel Aviv (IL)
Assigned to Corephotonics Ltd., Tel Aviv (IL)
Appl. No. 17/628,905
Filed by Corephotonics Ltd., Tel Aviv (IL)
PCT Filed Jul. 26, 2021, PCT No. PCT/IB2021/056693
§ 371(c)(1), (2) Date Jan. 21, 2022,
PCT Pub. No. WO2022/023914, PCT Pub. Date Feb. 3, 2022.
Claims priority of provisional application 63/059,200, filed on Jul. 31, 2020.
Prior Publication US 2023/0314175 A1, Oct. 5, 2023
Int. Cl. G01D 5/14 (2006.01)
CPC G01D 5/145 (2013.01) 34 Claims
OG exemplary drawing
 
1. A position sensing unit, comprising:
a) 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
b) 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≤100 mm, stroke L beginning at a first point x0 and ending at a final point xmax over which the magnetic flux B changes, 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>10,
wherein the at least three magnets are positioned sequentially along the first direction, and wherein adjacent magnets are separated by a gap.