Rotational Angle Sensor Magnet Segmentation
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Solution Overview
Problem
Existing devices for measuring the angle of an axis of rotation using a magnetic sensor suffer from high sensor errors due to the concentration of the magnetic field not occurring in the desired area, leading to inaccuracies when the magnet is mispositioned relative to the sensor.
Innovation Solution
A device comprising a magnet with two magnet sections, each with a different magnetic orientation, where one section is displaced 90° relative to the other, creating a varying concentration of external magnetic flux lines that can be detected by a sensor, reducing errors and allowing for accurate measurement regardless of magnet position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a magnetic ring neck is used with the sensor positioned in the center underneath, then the device structure is simple, but the magnetic field concentration does not occur in the desired area leading to high sensor error
Solution Approach 1:
The magnet is divided into multiple magnet sections (first magnet section with first magnetic orientation, second magnet section with second magnetic orientation) arranged around the axis of rotation. This segmentation creates different magnetic field concentrations at different positions, allowing the sensor to detect angle changes accurately regardless of magnet position.
Solution Approach 2:
Different magnet sections have different magnetic orientations (first magnetic orientation, second magnetic orientation) to create local variations in magnetic field concentration. This ensures that there are always areas with sufficient magnetic field strength for accurate sensor detection, resolving the issue of field concentration not occurring in the desired area.
2Device complexity
If the sensor is positioned in the center underneath the magnetic ring neck, then the device is compact, but false position of the magnet towards the sensor involves highly increased sensor error
Solution Approach 1:
The magnetic ring neck is segmented into multiple magnet sections with different orientations. This ensures that even when the magnet is falsely positioned relative to the sensor, there are always some magnet sections that produce sufficient magnetic field concentration for accurate detection, thereby reducing sensor error caused by mispositioning.
Solution Approach 2:
The magnetic orientation parameter is varied across different magnet sections (first magnetic orientation, second magnetic orientation). This parameter variation ensures that the magnetic field distribution remains effective for sensor detection even when the relative position between magnet and sensor changes, improving measurement reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a reliable and simple method for measuring the angle of an axis of rotation with reduced sensor errors, as the varying magnetic flux concentrations allow for precise detection, even when the magnet is not perfectly aligned with the sensor.
Implementation Method 1
a magnet with a magnet surface (14), which is pivotally assembled at the axis of rotation (10). Further, the device comprises a sensor (16) for the recognition of external magnetic flux lines of the magnet
Implementation Method 2
a sensor (16) for the recognition of external magnetic flux lines of the magnet
Data Source
AI summary
The invention relates to a device (1) for measurement of an angle of an axis of rotation (10), comprising a magnet (12) with a magnet surface (14), which is pivotally assembled at the axis of rotation (10), and further comprising a sensor (16) for recognition of external magnetic flux lines of the magnet (12). According to the invention, the magnet (12) comprises at least a first magnet section (20) with a magnetic first orientation (22) and the magnet (12) further at least comprises a second magnet section (24) with a second magnetic orientation (26), wherein the first magnetic orientation (22) is displaced from the second magnetic orientation (26), whereby the magnet surface (14) comprises a different concentration of external magnetic flux lines.