US 12,215,973 B2
Magnetic-field-based angle sensor system with stray field compensation and method for stray field compensation
Benjamin Kollmitzer, Pörtschach (AT); Wolfgang Granig, Seeboden (AT); Udo Hafner, Klagenfurt (AT); and Manuel Gillinger, Steindorf (AT)
Assigned to Infineon Technologies AG, Neubiberg (DE)
Filed by Infineon Technologies AG, Neubiberg (DE)
Filed on Aug. 19, 2021, as Appl. No. 17/406,496.
Claims priority of application No. 102020210617.7 (DE), filed on Aug. 20, 2020.
Prior Publication US 2022/0057189 A1, Feb. 24, 2022
Int. Cl. G01B 7/30 (2006.01); G01D 5/14 (2006.01); G01D 5/16 (2006.01); G01D 5/244 (2006.01); G01D 5/245 (2006.01); G01D 18/00 (2006.01); G01R 33/07 (2006.01); G01R 33/09 (2006.01)
CPC G01B 7/30 (2013.01) [G01D 5/145 (2013.01); G01D 5/16 (2013.01); G01D 5/24485 (2013.01); G01D 5/2451 (2013.01); G01D 18/001 (2021.05); G01R 33/07 (2013.01); G01R 33/09 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A magnetic-field-based angle sensor system, comprising:
a stator component;
a rotor component configured to rotate relative to the stator component,
wherein the rotor component comprises a multipole magnet;
a first magnetic field sensor configured to:
operate in a saturation operation, and
determine a rotation angle of the rotor component around an axis perpendicular to a surface of the stator component based on a magnetic field of the multipole magnet;
a second magnetic field sensor configured to:
operate in a linear operation, and
ascertain an external magnetic stray field acting on the magnetic-field-based angle sensor system; and
a controller configured to;
perform an autocalibration on output signals of the second magnetic field sensor to ascertain stray-field-dependent compensation parameters corresponding to the external magnetic stray field, and
compensate for a stray-field-dependent measurement deviation in the determination of the rotation angle based on the stray-field-dependent compensation parameters.