Magnetic Sensor With Soft Magnetic Focusing Member
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Solution Overview
Problem
Magnetic sensors using the magnetic impedance effect struggle with low sensitivity in detecting magnetic field changes, as they require enhanced capabilities to accurately sense and respond to variations in magnetic fields.
Innovation Solution
Incorporating a focusing member and a diverging member with specific geometric configurations, made of soft magnetic materials, to concentrate and distribute magnetic force lines effectively onto and from the sensitive element, respectively, thereby increasing the magnetic flux density and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic sensor uses a sensitive element sensing a magnetic field by the magnetic impedance effect, then the sensor can detect magnetic fields, but the sensitivity to changes in the magnetic field is low
Solution Approach 1:
A focusing member made of soft magnetic material is introduced as an intermediary between the external magnetic field and the sensitive element. This focusing member concentrates magnetic force lines from outside onto the sensitive element, enhancing the magnetic field intensity at the sensing location and thereby improving sensitivity without compromising detection accuracy
Solution Approach 2:
The geometric parameters of the focusing member are optimized to control magnetic flux concentration. By adjusting the width ratio between the wide part and facing part, and the length of extending parts, the magnetic field distribution is modified to maximize sensitivity while maintaining reliable detection
2Measurement precision
If the focusing member has a wide part with width wider than the facing part in a direction intersecting the magnetic force lines, then magnetic force lines are concentrated onto the sensitive element, but the device structure becomes more complex
Solution Approach 1:
The focusing member features a local widening (wide part) only at specific locations where magnetic flux concentration is needed, while other portions maintain simpler geometries. This localized structural modification achieves magnetic field concentration without requiring complete structural redesign, thus limiting the increase in device complexity
Solution Approach 2:
The focusing member is divided into distinct functional segments: a wide part for capturing magnetic flux, a facing part for directing flux to the sensitive element, and extending parts for field distribution. This segmentation allows each portion to be optimized independently, simplifying the overall design process while achieving the desired magnetic concentration effect
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 configuration significantly enhances the sensitivity of magnetic sensors by intensifying the magnetic field applied to the sensitive element, allowing for more precise detection of magnetic field changes, as demonstrated by improved impedance changes and reduced noise levels.
Implementation Method 1
a focusing member provided to face the sensitive element, configured with a soft magnetic material, and focusing magnetic force lines from outside onto the sensitive element
Implementation Method 2
a sensitive element sensing a magnetic field by a magnetic impedance effect
Implementation Method 3
a diverging member provided to face the sensitive element, configured with a soft magnetic material, and diverging the magnetic force lines passed through the sensitive element to the outside
Data Source
AI summary
The sensitivity of a magnetic sensor using a sensitive element sensing a magnetic field by the magnetic impedance effect is increased. The magnetic sensor includes: a sensitive element sensing a magnetic field by a magnetic impedance effect; and a focusing member provided to face the sensitive element, configured with a soft magnetic material, and focusing magnetic force lines from outside onto the sensitive element.