Apparatus and method for determining rotation angle

Abstract

The present disclosure relates to a device for determining the angle of rotation of a measurement object influencing the orientation of a magnetic field, the measurement object having an axis of rotation in the z-direction, the device comprising: at least three first magnetic field sensor elements uniformly arranged around the axis of rotation, They are each sensitive to the magnetic field component in the z direction; at least three second magnetic field sensor elements uniformly arranged around the axis of rotation are each sensitive to the magnetic field component in the x‑y plane; 3. The device for determining the rotation angle of the fourth combined signal, the first combined signal is based on the first combination of the measurement signals of the first magnetic field sensor element, the second combined signal is based on the second combination of the measurement signals of the first magnetic field sensor element, and the third combined signal The fourth combined signal is based on the second combination of the measurement signals of the second magnetic field sensor element according to the first combination of the measurement signals of the second magnetic field sensor element.

Description

technical field [0001] The present disclosure relates generally to position or angle sensors, and more particularly to angle sensors that take into account mechanical misalignment between the sensor element and the measurement object. Background technique [0002] Magnetic position or angle sensors are used, for example, in the automotive environment to resolve linear and angular positions. The angle sensor can be realized, for example, by means of a magnetic field sensor, which is placed in the vicinity of a rotating measuring object, such as a shaft. In this case, the first measurement value (X) can be determined as a function of the magnetic field depending on the rotation angle θ of the measurement object. Furthermore, the second measurement value (Y) can be determined from the magnetic field depending on the rotation angle θ of the measurement object. Ideally, the two measurements correspond to periodic signals of the form X=A*cos(θ) and Y=A*sin(θ). The rotation angl...

AI Technical Summary

Problems solved by technology

The angular accuracy of this arrangement is usually strictly limited by the positioning tolerances of the sensors

If one-tenth of the magnet diameter has been displaced or misaligned, this limits the achievable accuracy to approximately 1°

[0006] In practice, however, mechanical misalignment between the sensor element and the measurement object or magnet is usually not completely avoided, so there are different amplitudes, offsets and phase shifts of the periodic signals X and Y, which in turn lead to erroneous angle estimates

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