Magnetic Sensor Orthogonal Detection Asymmetry Compensation
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Solution Overview
Problem
Integrated geomagnetic sensors with soft magnetic structures often result in unequal output characteristics for X-axis and Y-axis magnetic sensors due to the concentration of magnetic flux, leading to inconsistent detection of external magnetic fields in three orthogonal directions.
Innovation Solution
A magnetic sensor design with three detection units, including a soft magnetic structure, where the detection units are positioned to prevent unequal output characteristics by ensuring equal distances from a reference plane and specific positional relationships to mitigate the effects of the soft magnetic structure, using magnetoresistive elements and computing circuits to process detection values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If soft magnetic bodies are added to convert vertical magnetic field components, then Z-axis magnetic field detection is enabled, but the magnetic fields applied to X- and Y-axis magnetic sensors become different causing unequal output characteristics
Solution Approach 1:
The patent applies asymmetry by intentionally introducing compensating structures that create asymmetric magnetic field distributions to counterbalance the asymmetric effects caused by soft magnetic bodies. The compensating soft magnetic bodies are positioned and configured to create opposite asymmetries that cancel out the unwanted magnetic flux concentration effects on X- and Y-axis sensors.
Solution Approach 2:
The patent introduces compensating soft magnetic bodies as intermediary elements that mediate between the Z-axis detection function and the X/Y-axis detection accuracy. These intermediary structures transfer and redirect magnetic flux in a controlled manner to prevent the soft magnetic bodies from causing unequal output characteristics.
2Volume of moving object
If three detection units are integrated on a substrate, then compact 3D magnetic field detection is achieved, but unequal output characteristics occur due to magnetic flux concentration
Solution Approach 1:
The patent applies local quality by creating non-uniform magnetic field distributions through strategically positioned compensating soft magnetic bodies. Different regions of the substrate experience different magnetic field conditions, with the compensating structures creating localized field modifications that cancel out unwanted effects in specific detection regions.
Solution Approach 2:
The patent changes magnetic field parameters (strength, direction, distribution) by introducing compensating soft magnetic bodies that modify the local magnetic environment. These parameter changes enable the system to maintain accurate detection despite the presence of soft magnetic structures by dynamically adjusting the magnetic field characteristics.
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 design ensures consistent output characteristics across detection units, effectively canceling out errors caused by the soft magnetic structure, thereby accurately detecting external magnetic fields in three orthogonal directions.
Implementation Method 1
The soft magnetic bodies convert vertical magnetic field components, which are in a direction parallel to the Z-axis, into horizontal magnetic field components in a direction perpendicular to the Z-axis
Implementation Method 2
Examples of the magnetic detection elements include magnetoresistive elements
Data Source
AI summary
A magnetic sensor includes first, second, and third detection units for detecting components in X, Y, and Z directions of an external magnetic field. The third detection unit includes a soft magnetic structure. The first detection unit includes a first portion and a second portion. The second detection unit includes a third portion and a fourth portion. The first portion and the fourth portion are located on opposite sides of the third detection unit in the X direction. The second portion and the third portion are located on opposite sides of the third detection unit in the Y direction.