Sensor devices and methods for determining a rotation angle of a magnet
AssigneeInfineon Technologies AG
InventorsJoo II Park, Richard Heinz, Hyun Jeong Kim, Stephan Leisenheimer, Severin Neuner
Life of this patent
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Abstract
A method for determining a rotation angle of a magnet includes measuring a 3D magnetic field vector of a magnetic field generated by the magnet, wherein the 3D magnetic field vector describes at least a part of an ellipse in 3D space during a rotational movement of the magnet. The method further includes mapping the measured 3D magnetic field vector to a 2D vector based on a compensation mapping, wherein the compensation mapping is configured to map the ellipse in 3D space to a circle in 2D space. The method further includes determining the rotation angle of the magnet based on the 2D vector.
Claims25
A method for determining a rotation angle of a magnet, the method comprising:
- measuring, by a sensor device associated with the magnet, a 3D magnetic field vector of a magnetic field generated by the magnet, wherein the 3D magnetic field vector describes at least a part of an ellipse in 3D space during a rotational movement of the magnet;
- mapping the measured 3D magnetic field vector to a 2D vector based on a compensation mapping,
- wherein the compensation mapping is configured to map the ellipse in 3D space to a circle in 2D space, and
- wherein the compensation mapping is based on a linear mapping represented by a compensation matrix;
- and
- determining a rotation angle of the magnet based on the 2D vector.
A sensor device, comprising:
- a magnetic field sensor configured to measure a 3D magnetic field vector of a magnetic field generated by a magnet,
- wherein the 3D magnetic field vector describes at least a part of an ellipse in 3D space during a rotational movement of the magnet;
- and
- at least one processor configured to:
- map the measured 3D magnetic field vector to a 2D vector based on a compensation mapping, wherein the compensation mapping is configured to map the ellipse in 3D space to a circle in 2D space,
- wherein the compensation mapping is based on a linear mapping represented by a compensation matrix;
- and
- determine a rotation angle of the magnet based on the 2D vector.
Dependencies are inferred from the claim text.