Magnetic Sensor Core Clearance and Interference Reduction
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Solution Overview
Problem
Existing magnetic sensor devices face challenges in miniaturization while maintaining accurate measurements of three magnetic field components aligned perpendicularly, due to interference between magnetic core structures and coils, which limits their compact design and increases manufacturing costs.
Innovation Solution
The magnetic sensor device employs a specific configuration where magnetic core structures are positioned with a clearance of less than 20% of their maximum extension, allowing for close placement without significant interference, enabling miniaturization and reducing manufacturing costs by allowing multiple devices to be produced on a shared wafer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If magnetic core structures are placed close to each other for miniaturization, then device volume is reduced, but interference between measuring elements increases
Solution Approach 1:
A non-magnetic spacer structure is introduced as an intermediary element between the first and second magnetic core structures. This spacer prevents direct magnetic interaction while allowing the cores to be positioned close together, thus reducing interference effects while maintaining miniaturization benefits
Solution Approach 2:
The magnetic core structures are designed with specific local properties: they have magnetization directions oriented perpendicular to each other, and their geometries are optimized (e.g., elongated shapes aligned with detection directions). This local differentiation allows each core to measure a specific magnetic field component while minimizing cross-interference with other cores
2Adaptability or versatility
If three fluxgate magnetometers are aligned at right angles for three-axis measurement, then measurement capability is improved, but device complexity and volume increase
Solution Approach 1:
Multiple measuring functions are merged into a compact integrated structure. The first and second magnetic core structures with their respective coils are combined in close proximity with perpendicular orientations, allowing three-axis magnetic field measurement in a single integrated device rather than separate components
Solution Approach 2:
The magnetic core structures utilize three-dimensional spatial arrangement with perpendicular orientations along different axes. By exploiting the third dimension (vertical stacking or orthogonal positioning), the device achieves three-axis measurement capability without proportionally increasing planar footprint
3Ease of manufacture
If clearance between magnetic core structures is reduced for miniaturization, then manufacturing cost is reduced, but measurement accuracy may deteriorate
Solution Approach 1:
The non-magnetic spacer acts as a controlled intermediary that maintains a precise, minimal clearance between magnetic core structures. This ensures manufacturing feasibility with reduced costs while the spacer's non-magnetic properties prevent interference that would compromise measurement accuracy
Solution Approach 2:
The clearance distance between magnetic core structures is optimized to a specific parameter range (less than 20% of the maximum extension of the first magnetic core structure). This parameter optimization balances miniaturization benefits with measurement accuracy 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 minimizes interference between measuring elements, enabling the production of compact, cost-effective magnetic sensor devices suitable for diverse applications, including mobile devices, by reducing the device's size and weight while maintaining accurate measurements.
Implementation Method 1
Fluxgate magnetometers, which are used in digital compasses, for example, are available. A fluxgate magnetometer, which may also be referred to as a Förster probe, has a drive coil and a detector coil which are guided around a magnet core.
Implementation Method 2
The present invention relates to a magnetic sensor device... measure three magnetic field components of a magnetic field... magnetic core structures... passive measuring element... active measuring element
Data Source
AI summary
A magnetic sensor device having a first magnetic core structure which is aligned along a first central longitudinal axis and has at least one first coil, and having a second magnetic core structure which includes at least one second coil, the second magnetic core structure extending from a first end face of the second magnetic core structure along a second central longitudinal axis to a second end face of the second magnetic core structure, the second central longitudinal axis lying in a plane aligned in a direction normal to the first central longitudinal axis, and the second magnetic core structure being positioned in relation to the first magnetic core structure in such a way that a clearance between the first end face of the second magnetic core structure and a first center of mass of the first magnetic core structure is less than 20% of a maximum extension of the first magnetic core structure along the first central longitudinal axis.