Off-Axis Magnetic Angle Sensor Positioning
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Solution Overview
Problem
Magnetic angle sensors face challenges when positioned off-axis, introducing non-linearities and reducing robustness, which necessitates end-of-line calibration and increases the risk of angle errors due to positioning tolerances.
Innovation Solution
The magnetic angle sensor is placed at a specific off-axis position where the amplitude of the radial component of the rotating magnetic field matches the amplitude of the tangential component, or where the gradient magnitudes of both components are equal, eliminating the need for end-of-line calibration and enhancing robustness against positioning tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the magnetic angle sensor is positioned off-axis, then the sensor can be placed in a compact configuration, but non-linearities are introduced and robustness is reduced
Solution Approach 1:
The patent applies parameter changes by carefully selecting the radial distance of the sensor from the rotation axis. By positioning the sensor at a specific radial distance where the gradient magnitudes of radial and tangential magnetic field components are equal, the system transforms the off-axis configuration from a problematic setup into an optimized one that eliminates non-linearities and calibration requirements.
2Device complexity
If the magnetic angle sensor is positioned off-axis, then device compactness is improved, but end-of-line calibration becomes necessary
Solution Approach 1:
The patent resolves the calibration issue by changing the positional parameter (radial distance) to a specific value where the magnetic field gradient magnitudes are equal. This parameter optimization eliminates the need for end-of-line calibration, making the manufacturing process simpler while maintaining compact device design.
3Adaptability or versatility
If the magnetic angle sensor is positioned off-axis, then spatial arrangement flexibility is improved, but angle error risk increases due to positioning tolerances
Solution Approach 1:
The patent addresses positioning tolerance sensitivity by selecting a specific radial distance parameter where the magnetic field gradient characteristics provide optimal performance. At this optimized position, the equal gradient magnitudes of radial and tangential components create a measurement configuration that is robust against positioning variations, maintaining high angle measurement accuracy despite spatial arrangement flexibility.
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
This configuration improves the operation of the angle sensor by eliminating the need for end-of-line calibration and increasing its robustness against static and dynamic positioning tolerances, ensuring accurate determination of the rotation angle without introducing angle errors.
Implementation Method 1
a magnetic angle sensor configured to determine a rotation angle of the magnet based on a rotating magnetic field produced by the magnet and sensed by the magnetic angle sensor
Data Source
AI summary
A system may include a magnet fixed to a rotatable object. The rotatable object may be portioned to concentrically rotate about an axis. The system may also include a magnetic angle sensor configured to determine a rotation angle of the rotatable object based on a rotating magnetic field produced by the magnet and sensed by the magnetic angle sensor. The rotating magnetic field may have a radial component and a tangential component, and the magnetic angle sensor may be positioned at a sensor position having a non-zero radial distance from the axis. At the sensor position, an amplitude of the radial component may substantially match an amplitude of the tangential component, or the radial component and the tangential component may share a substantially same gradient magnitude.