Hall sensor
First Claim
1. A sensor assembly (1) for determining an angular position of a rotor (4) relative to a stator (5), comprising two components, namely a magnet (2) and a sensor (3),wherein said components (2, 3) are arranged for rotation relative to each other about an axis of rotation (A),wherein the sensor (3) comprises a first and a second sensor pair (31, 32), each one having a first sensor element and a second sensor element (311, 312, 321, 322), each one of the sensor elements (311, 312, 321, 322) being configured for determining a magnetic field strength to which it is exposed;
- wherein each sensor pair (31, 32) has a straight line (313, 323) associated therewith, along which the two sensor elements (311, 312, 321, 322) lie and which intersects with the axis of rotation (A),wherein the first sensor element (311, 321) has a smaller radial distance from the axis of rotation (A) than the second sensor element (312, 322),wherein both sensor elements (311, 312, 321, 322) lie on the same radial side of the axis of rotation (A), andwherein the straight line (313) associated with the first sensor pair (31) is spaced apart from the straight line (323) associated with the second sensor pair (32) by a rotational angle (β
) about the axis of rotation (A),the sensor assembly (1) further comprising a computing unit for determining the angular position of the rotor (4) relative to the stator (5), wherein the computing unit is configured to determine measured values from the sensor elements (311, 312, 321, 322), which measured values are proportional to a magnetic field prevailing at the respective sensor element (311, 312, 321, 322),wherein, for eliminating an interfering influence of an external interfering magnetic field, the computing unit is configured to determine a first differential value by subtracting a measured value determined from the first sensor element (311) of the first sensor pair (31) from a measured value determined from the second sensor element (312) of the first sensor pair (31), and to determine a second differential value by subtracting a measured value determined from the first sensor element (321) of the second sensor pair (32) from a measured value determined from the second sensor element (322) of the second sensor pair (32), and to determine the angular position of the rotor (4) relative to the stator (5) from the ratio of said differential values.
1 Assignment
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Accused Products
Abstract
A sensor assembly is provided for determining an angular position of a rotor in relation to a stator, including two components, a magnet and a sensor, where the components are arranged in such a way that the components can be rotated in relation to each other about an axis of rotation, and the sensor includes a first and a second sensor pair, each having a first and a second sensor element. A straight line is associated with each sensor pair, along which straight line the two sensor elements lie and which straight line intersects with the axis of rotation, where the first sensor element has a smaller distance from the axis of rotation than the second sensor element, and the straight line associated with the first sensor pair is spaced apart from the straight line associated with the second sensor pair by a rotational angle about the axis of rotation.
7 Citations
13 Claims
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1. A sensor assembly (1) for determining an angular position of a rotor (4) relative to a stator (5), comprising two components, namely a magnet (2) and a sensor (3),
wherein said components (2, 3) are arranged for rotation relative to each other about an axis of rotation (A), wherein the sensor (3) comprises a first and a second sensor pair (31, 32), each one having a first sensor element and a second sensor element (311, 312, 321, 322), each one of the sensor elements (311, 312, 321, 322) being configured for determining a magnetic field strength to which it is exposed; -
wherein each sensor pair (31, 32) has a straight line (313, 323) associated therewith, along which the two sensor elements (311, 312, 321, 322) lie and which intersects with the axis of rotation (A), wherein the first sensor element (311, 321) has a smaller radial distance from the axis of rotation (A) than the second sensor element (312, 322), wherein both sensor elements (311, 312, 321, 322) lie on the same radial side of the axis of rotation (A), and wherein the straight line (313) associated with the first sensor pair (31) is spaced apart from the straight line (323) associated with the second sensor pair (32) by a rotational angle (β
) about the axis of rotation (A),the sensor assembly (1) further comprising a computing unit for determining the angular position of the rotor (4) relative to the stator (5), wherein the computing unit is configured to determine measured values from the sensor elements (311, 312, 321, 322), which measured values are proportional to a magnetic field prevailing at the respective sensor element (311, 312, 321, 322), wherein, for eliminating an interfering influence of an external interfering magnetic field, the computing unit is configured to determine a first differential value by subtracting a measured value determined from the first sensor element (311) of the first sensor pair (31) from a measured value determined from the second sensor element (312) of the first sensor pair (31), and to determine a second differential value by subtracting a measured value determined from the first sensor element (321) of the second sensor pair (32) from a measured value determined from the second sensor element (322) of the second sensor pair (32), and to determine the angular position of the rotor (4) relative to the stator (5) from the ratio of said differential values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for determining an angular position of a rotor (4) relative to a stator (5) using a sensor assembly (1) that comprises two components, namely a magnet (2) and a sensor (3), one of the two components (2, 3) being arranged on the rotor (4) and the other one on the stator (5),
wherein the sensor (3) comprises a first and a second sensor pair (31, 32), each one comprising two sensor elements (311, 312, 321, 322), wherein each sensor pair (31, 32) has a straight line (313, 323) associated therewith, along which the two sensor elements (311, 312, 321, 322) lie and which intersects with the axis of rotation (A), wherein the first sensor element (311, 321) has a smaller radial distance from the axis of rotation (A) than the second sensor element (312, 322), wherein both sensor elements (311, 312, 321, 322) lie on the same radial side of the axis of rotation (A), and wherein the straight line (313) associated with the first sensor pair (31) is spaced apart from the straight line (323) associated with the second sensor pair (32) by a rotational angle (β - ) about the axis of rotation (A), such that the sensor pairs (31, 32) are spaced apart from each other by a rotational angle (β
) about an axis of rotation (A) about which the rotor (4) is rotatable relative to the stator (5),wherein measured values are determined from the sensor elements (311, 312, 321, 322), each measured value being proportional to a magnetic field prevailing at the respective sensor element (311, 312, 321, 322), wherein, for eliminating an interfering influence of an external interfering magnetic field, a first differential value is determined by subtracting a measured value determined from the first sensor element (311) of the first sensor pair (31) from a measured value determined from the second sensor element (312) of the first sensor pair (31), and a second differential value is determined by subtracting a measured value determined from the first sensor element (321) of the second sensor pair (32) from a measured value determined from the second sensor element (322) of the second sensor pair (32), and wherein the angular position is determined from the ratio of the two differential values.
- ) about the axis of rotation (A), such that the sensor pairs (31, 32) are spaced apart from each other by a rotational angle (β
Specification