Magnetic angle sensor device and method of operation
First Claim
1. Magnetic angle sensor device comprising:
- a shaft rotatable around a rotation axis;
a magnetic field source coupled to the shaft;
a first magnetic angle sensor configured to generate a first signal that represents a first error angle based on a first diametric magnetic field from the magnetic field source and a disturbance magnetic field, both applied to the first magnetic angle sensor, wherein the disturbance magnetic field causes a first resulting magnetic field vector to deviate from a first target magnetic field vector by the first error angle;
a second magnetic angle sensor configured to generate a second signal that represents a second error angle based on a second diametric magnetic field from the magnetic field source and the disturbance magnetic field, both applied to the second magnetic angle sensor, wherein the disturbance magnetic field causes a second resulting magnetic field vector to deviate from a second target magnetic field vector by the second error angle; and
a combining circuit configured to determine a combined rotation angle based on the first signal and on the second signal, wherein the combining circuit is configured to determine the first error angle and the second error angle, and determine the combined rotation angle based on the first error angle and the second error angle,wherein the first magnetic angle sensor and the second magnetic angle sensor are located at different distances from the magnetic field source, where the different distances are measured from the magnetic field source along an extension of the rotation axis, andwherein each of the first magnetic angle sensor and the second magnetic angle sensor are arranged such that a strength of the first diametric magnetic field acting on the first magnetic angle sensor is mutually different from a strength of the second diametric magnetic field acting on the second magnetic angle sensor.
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Abstract
A magnetic angle sensor device and a method for operating such device is provided. The magnetic angle sensor device includes a shaft rotatable around a rotation axis; a magnetic field source coupled to the shaft; a first magnetic angle sensor configured to generate a first signal that represents a first angle based on a first diametric magnetic field from the magnetic field source applied to the first magnetic angle sensor; a second magnetic angle sensor configured to generate a second signal that represents a second angle based on a second diametric magnetic field from the magnetic field source applied to the second magnetic angle sensor; and a combining circuit configured to determine a combined rotation angle based on the first signal and on the second signal.
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Citations
24 Claims
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1. Magnetic angle sensor device comprising:
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a shaft rotatable around a rotation axis; a magnetic field source coupled to the shaft; a first magnetic angle sensor configured to generate a first signal that represents a first error angle based on a first diametric magnetic field from the magnetic field source and a disturbance magnetic field, both applied to the first magnetic angle sensor, wherein the disturbance magnetic field causes a first resulting magnetic field vector to deviate from a first target magnetic field vector by the first error angle; a second magnetic angle sensor configured to generate a second signal that represents a second error angle based on a second diametric magnetic field from the magnetic field source and the disturbance magnetic field, both applied to the second magnetic angle sensor, wherein the disturbance magnetic field causes a second resulting magnetic field vector to deviate from a second target magnetic field vector by the second error angle; and a combining circuit configured to determine a combined rotation angle based on the first signal and on the second signal, wherein the combining circuit is configured to determine the first error angle and the second error angle, and determine the combined rotation angle based on the first error angle and the second error angle, wherein the first magnetic angle sensor and the second magnetic angle sensor are located at different distances from the magnetic field source, where the different distances are measured from the magnetic field source along an extension of the rotation axis, and wherein each of the first magnetic angle sensor and the second magnetic angle sensor are arranged such that a strength of the first diametric magnetic field acting on the first magnetic angle sensor is mutually different from a strength of the second diametric magnetic field acting on the second magnetic angle sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for determining a combined rotation angle of a shaft, wherein the shaft is arranged rotatably around a rotation axis and wherein a magnetic field source is connected to the shaft, the method comprising:
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generating, by a first magnetic angle sensor, a first signal that represents a first error angle based on a first diametric magnetic field from the magnetic field source and a disturbance magnetic field, both applied to the first magnetic angle sensor, wherein the disturbance magnetic field causes a first resulting magnetic field vector to deviate from a first target magnetic field vector by the first error angle; generating, by a second magnetic angle sensor, a second signal that represents a second error angle based on a second diametric magnetic field from the magnetic field source and the disturbance magnetic field, both applied to the second magnetic angle sensor, wherein the disturbance magnetic field causes a second resulting magnetic field vector to deviate from a second target magnetic field vector by the second error angle; and determining the combined rotation angle based on the first signal and on the second signal, including determining the first error angle and the second error angle, and determining the combined rotation angle based on the first error angle and the second error angle, wherein the first magnetic angle sensor and the second magnetic angle sensor are located at different distances from the magnetic field source, where the different distances are measured from the magnetic field source along an extension of the rotation axis, and wherein each of the first magnetic angle sensor and the second magnetic angle sensor are arranged such that a strength of the first diametric magnetic field acting on the first magnetic angle sensor is mutually different from a strength of the second diametric magnetic field acting on the second magnetic angle sensor. - View Dependent Claims (24)
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Specification