US 9,810,551 B2
On-axis magnetic field angle sensors, systems and method
Udo Ausserlechner, Villach (AT)
Assigned to Infineon Technologies AG, Neubiberg (DE)
Filed by Infineon Technologies AG, Neubiberg (DE)
Filed on Feb. 8, 2016, as Appl. No. 15/18,349.
Application 15/018,349 is a continuation of application No. 14/083,639, filed on Nov. 19, 2013, granted, now 9,267,781.
Prior Publication US 2016/0216133 A1, Jul. 28, 2016
This patent is subject to a terminal disclaimer.
Int. Cl. G01B 7/30 (2006.01); G01R 33/07 (2006.01); G01R 33/09 (2006.01); G01D 5/14 (2006.01); G01B 7/00 (2006.01); G01D 5/12 (2006.01); G01D 5/20 (2006.01)
CPC G01D 5/142 (2013.01) [G01B 7/003 (2013.01); G01B 7/30 (2013.01); G01D 5/12 (2013.01); G01D 5/147 (2013.01); G01D 5/20 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A magnetic field angle sensor system comprising:
a shaft rotatable around a rotation axis;
a soft magnetic end portion rotatable with the shaft and being rotationally asymmetric with respect to the rotation axis;
a magnetic field source magnetizing the soft magnetic end portion;
one or more magnetic field sensor elements configured to detect a magnetic field caused by the magnetized end portion; and
circuitry coupled to the one or more magnetic field sensor elements and configured to estimate a rotational position of the shaft by combining signals of the one or more magnetic field sensor elements, and estimate a transient angle error and adjust the estimated rotational position of the shaft based on the estimated transient angle error.