Magnetic Field Sensor Position Detection Using 3D Vector Angles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for determining the precise position of a magnetic field sensor relative to a magnet are inefficient and require extensive data storage or multiple calculation steps, which can negatively impact processes such as wireless charging and headlight alignment.
Innovation Solution
A method and sensor device that measures a 3D magnetic field vector to determine displacements using simple linear calculations based on arctangent functions, requiring only a one-point calibration to establish proportionality factors, allowing direct positioning of the magnetic field sensor relative to the magnet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing methods for determining precise position are used, then measurement precision is improved, but device complexity and data storage requirements increase
Solution Approach 1:
The patent transforms the position determination problem from using complex multi-dimensional magnetic field data to using a simplified relationship based on the angle of the magnetic field vector in the xz-plane. By changing the parameter from full 3D field analysis to angle-based calculation (arctan(Bz/Bx)), the system achieves precise positioning with reduced computational complexity and no additional data storage requirements
Solution Approach 2:
The patent extracts only the essential information needed for position determination - specifically the angle of the magnetic field vector in the xz-plane - while discarding redundant data. This extraction approach allows precise position calculation using only Bx and Bz components, eliminating the need to process or store Cy by components, thereby reducing device complexity
2Measurement precision
If multiple calculation steps are used to determine position, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The patent replaces complex mechanical or computational positioning systems with a direct mathematical relationship based on magnetic field angle measurement. The position is determined through a single arctangent calculation (α = arctan(Bz/Bx)) followed by a linear relationship (x = kx·α), eliminating the need for multiple iterative calculation steps and significantly improving positioning speed while maintaining precision
Solution Approach 2:
The patent establishes a pre-determined linear relationship between the magnetic field angle and the x-coordinate through calibration (x = kx·α). This preliminary action allows the system to directly calculate position from angle measurement without requiring real-time complex computations, thereby improving productivity while maintaining measurement precision
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
Enables rapid and precise positioning of the magnetic field sensor, reducing the need for extensive data storage and multiple calculations, thereby improving efficiency in applications like wireless charging and headlight alignment.
Implementation Method 1
measuring, by the magnetic field sensor, a three-dimensional (3D) magnetic field vector of a magnetic field generated by a magnet separated from the plane by an airgap
Data Source
AI summary
A method for determining a position of a magnetic field sensor in a plane defined by a first direction and a second direction perpendicular to the first direction includes an act of measuring, by the magnetic field sensor, a 3D magnetic field vector of a magnetic field generated by a magnet separated from the plane by an airgap, wherein the 3D magnetic field vector includes first, second, and third magnetic field components in respective first, second, and third directions. The method further includes determining a first displacement between the magnetic field sensor and the magnet in a first direction based on the first magnetic field component and the third magnetic field component. The method further includes determining a second displacement between the magnetic field sensor and the magnet in a second direction based on the second magnetic field component and the third magnetic field component.