Patent ID: 9267781
Filing Date: 2016-02-23
CPC Classification: G01B,G01D

Claim Text:
1. A magnetic field angle sensor system comprising: a shaft rotatable around a rotation axis; an end portion rotatable with the shaft and being rotationally asymmetric with respect to the rotation axis; a sensor die spaced apart from the end portion and comprising a first surface being substantially perpendicular to the rotation axis; at least three magnetic field sensor elements arranged spaced apart from one another on the first surface around a projection of the rotation axis onto the first surface; a magnetic field source; and circuitry coupled to the at least three magnetic field sensor elements and configured to estimate a rotational position of the shaft by combining signals of the at least three magnetic field sensor elements when, in operation, the end portion is magnetized by the magnetic field source and alters a magnetic field sensed by the at least three magnetic field sensor elements when the end portion rotates with the shaft, wherein the circuitry is configured to estimate a rotational position of the shaft by combining signals of the at least three magnetic field sensor elements to determine a real part Re{σ