Dual-axis fluxgate device with orthogonal magnetic cores
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Solution Overview
Problem
Fluxgate devices face challenges in achieving high sensitivity with low noise susceptibility, particularly in two-dimensional sensing applications like e-compass, where existing solutions often result in trade-offs between sensitivity and noise performance.
Innovation Solution
The integration of fluxgate devices with semiconductor substrates and orthogonally arranged magnetic cores, where the magnetization direction deviates from the sense directions by 0 to 90 degrees, reduces noise susceptibility and sensitivity mismatch between the cores, allowing for a wider range of geometric configurations and smaller device sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic cores are aligned with sense directions (0 degree deviation), then sensitivity is maximized, but noise susceptibility increases
Solution Approach 1:
The patent applies parameter changes by deviating the magnetization direction from the sense direction by a specific angle (0 to 90 degrees). This angular parameter modification simultaneously optimizes both sensitivity and noise susceptibility, resolving the contradiction between these two performance metrics.
Solution Approach 2:
The patent employs composite magnetic core structures with specific material compositions and geometric configurations. By combining different material properties and structural features, the device achieves both high sensitivity and low noise susceptibility without requiring perfect alignment between magnetization and sense directions.
2Adaptability or versatility
If magnetic cores are orthogonally arranged for 2D sensing, then dual-axis sensing capability is achieved, but sensitivity mismatch between cores occurs
Solution Approach 1:
The patent applies local quality by giving each magnetic core its own optimized magnetization direction that deviates from its respective sense direction. This localized optimization ensures that both orthogonally arranged cores achieve similar sensitivity levels, eliminating sensitivity mismatch while maintaining dual-axis sensing capability.
3Object-affected harmful factors
If magnetization direction deviates from sense direction, then noise susceptibility is reduced, but sensitivity decreases
Solution Approach 1:
The patent optimizes the deviation angle parameter to achieve a balance between noise susceptibility and sensitivity. By carefully selecting the angular deviation within the 0 to 90 degree range, the system reduces noise susceptibility while maintaining acceptable sensitivity levels, resolving the trade-off between these conflicting requirements.
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 enhances sensitivity and reduces noise susceptibility, achieving improved performance in 2D magnetic field sensing with lower noise levels, enabling more precise and compact fluxgate devices.
Implementation Method 1
a magnetization direction that reduces the dependency on shape anisotropy of the magnetic cores
Implementation Method 2
detecting a change in magnetic flux in an environment adjacent to the magnetic core structure
Implementation Method 3
coil members coiling around the magnetic core
Data Source
AI summary
A fluxgate device that includes a first magnetic core and a second magnetic core. The first magnetic core has a first magnetized direction that deviates from a first sense direction by more than 0 degree and less than 90 degrees. The second magnetic core is arranged orthogonally to the first magnetic core. The second magnetic core has a second magnetized direction that deviates from a second sense direction by more than 0 degree and less than 90 degrees.