System for determining position of an element in relation to another element using magnetic fields
First Claim
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1. A system comprising:
- a sensor assembly comprising one or more sensors each measuring position by measuring a magnetic field using a 3D magnetometer corresponding to three axes (X, Y, Z) arranged perpendicularly relative to each other,a moveable element moveable relative to the sensor assembly by a combined axial and rotational movement corresponding to a pre-defined axis, the rotational movement having a pre-determined relationship to the axial movement,a magnet mounted to the moveable element and moving together therewith, the magnet configured to generate a spatial magnetic field which relative to the sensor assembly varies corresponding to both the axial and rotational movement of the magnet and thus the moveable element, thereby generating a spatial magnetic field which varies uniquely relative to each sensor, anda processor configured to determine on the basis of measured values an axial position of the moveable element, wherein,the processor, on the basis of the measured values;
determines an initial axial position of the moveable element using 3D magnetometers,determines a rotational position of the moveable element using 3D magnetometers, andcalculates a corrected axial position of the moveable element,wherein the calculation is based on the determined initial axial position, the determined rotational position, and the pre-determined relationship between the rotational and the axial movement.
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Abstract
System comprising a sensor assembly (3, 4, 5, 6) adapted to measure a magnetic field, and a moveable element (1) adapted to be moved relative to the sensor assembly between two positions by a combined axial and rotational movement, the rotational movement having a pre-determined relationship to the axial movement. A magnet (3) is mounted to the moveable element and configured to generate a spatial magnetic field which relative to the sensor assembly varies corresponding to both the axial and rotational movement of the magnet and thus the moveable element. A processor is configured to determine on the basis of measured values for the magnetic field an axial position of the moveable element.
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Citations
11 Claims
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1. A system comprising:
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a sensor assembly comprising one or more sensors each measuring position by measuring a magnetic field using a 3D magnetometer corresponding to three axes (X, Y, Z) arranged perpendicularly relative to each other, a moveable element moveable relative to the sensor assembly by a combined axial and rotational movement corresponding to a pre-defined axis, the rotational movement having a pre-determined relationship to the axial movement, a magnet mounted to the moveable element and moving together therewith, the magnet configured to generate a spatial magnetic field which relative to the sensor assembly varies corresponding to both the axial and rotational movement of the magnet and thus the moveable element, thereby generating a spatial magnetic field which varies uniquely relative to each sensor, and a processor configured to determine on the basis of measured values an axial position of the moveable element, wherein, the processor, on the basis of the measured values; determines an initial axial position of the moveable element using 3D magnetometers, determines a rotational position of the moveable element using 3D magnetometers, and calculates a corrected axial position of the moveable element, wherein the calculation is based on the determined initial axial position, the determined rotational position, and the pre-determined relationship between the rotational and the axial movement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification