Magnetic Sensor Segmented Bias Magnets for Precision
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Solution Overview
Problem
Conventional magnetic sensors face challenges in achieving small size and high accuracy due to the limited configuration and shape of magnetoresistance elements, which affects their sensitivity to magnetic fields.
Innovation Solution
The magnetic sensor design includes a board with a magnetoresistance element group and a magnet group comprising separate magnets that apply magnetic biases to the elements, allowing for varied magnetic bias directions, thereby improving design freedom and achieving smaller size and higher accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one bias magnet is disposed directly below four magnetoresistance elements, then the device complexity is reduced, but the measurement precision and sensitivity deteriorate
Solution Approach 1:
The single bias magnet is divided into multiple separate bias magnets (first bias magnet and second bias magnet), with each magnet corresponding to specific magnetoresistance elements. This segmentation allows independent magnetic bias application to different element groups, improving measurement precision while maintaining manageable device complexity
Solution Approach 2:
Different bias magnets are positioned at specific locations corresponding to different magnetoresistance elements or groups of elements. Each bias magnet provides localized magnetic bias tailored to its associated elements, optimizing the magnetic field conditions for high-precision measurement without requiring a single complex unified structure
2Manufacturing precision
If the magnetoresistance elements have specific configuration and shape, then the manufacturing precision is improved, but the adaptability to different magnetic field conditions deteriorates
Solution Approach 1:
The magnetic bias conditions are made adjustable and adaptable through the separate bias magnet configuration. While the magnetoresistance elements maintain fixed precise configurations for manufacturing accuracy, the bias magnets can be independently positioned and oriented to adapt to different magnetic field detection requirements, achieving both precision and versatility
3Area of stationary object
If a bias magnet covers a region above the magnetoresistance element, then the magnetic field coverage is improved, but the device size increases
Solution Approach 1:
The bias magnet coverage is segmented into multiple smaller bias magnets positioned at specific locations rather than one large covering magnet. This provides sufficient magnetic field coverage for accurate measurement while reducing the overall device volume and enabling more compact sensor design
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 the sensitivity and accuracy of the magnetic sensor, enabling effective detection of rotation angles and magnetic field changes, while maintaining reliability through precise positioning and adhesive use.
Implementation Method 1
a magnetoresistance element group (2P) including a first magnetoresistance element (2) and a second magnetoresistance element (3) disposed on the board (1)
Implementation Method 2
a magnet group (5P) including a first magnet (5) corresponding to the first magnetoresistance element (2) and a second magnet (6) corresponding to the second magnetoresistance element (3)
Data Source
AI summary
A magnetic sensor includes a board, a magnetoresistance element group including first and second magnetoresistance elements disposed on the board, and a magnet group including a first magnet corresponding to the first magnetoresistance element and a second magnet corresponding to the second magnetoresistance element. This magnetic sensor can have a small size and high accuracy.