Magnetic-Field Sensor Design for Enhanced Positional Tolerance
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Summary
Problems
Magnetic-field sensors with back-bias magnets face challenges in accurately detecting movements due to sensitivity to different magnetic field components and varying responses, which can lead to overdriving of magneto-resistive sensor elements and reduced positional tolerance.
Innovation solutions
A magnetic-field sensor design featuring a magnetic body with a non-convex cross-sectional area and inhomogeneous magnetization, where the first and second spatial areas have distinct magnetic flux density ranges, allowing for the arrangement of magnetic-field sensor elements to optimize detection without overdriving, thereby increasing positional tolerance.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a back-bias magnet is used in the magnetic-field sensor, then the magnetic field detection capability is improved, but the sensor elements may be overdriven due to sensitivity to different magnetic field components
Why choose this principle:
The back-bias magnet is designed with spatially varying magnetization strength, where the magnetization is stronger in regions closer to the sensor elements and weaker in farther regions. This local quality variation ensures that the magnetic field is sufficient for detection near the sensor while avoiding overdriving in those regions
Principle concept:
If a back-bias magnet is used in the magnetic-field sensor, then the magnetic field detection capability is improved, but the sensor elements may be overdriven due to sensitivity to different magnetic field components
Why choose this principle:
The magnetization parameter of the back-bias magnet is changed spatially, creating an inhomogeneous magnetization distribution. This parameter change allows different regions of the magnet to provide appropriate field strengths for their respective distances from the sensor elements
Application Domain
Data Source
AI summary:
A magnetic-field sensor design featuring a magnetic body with a non-convex cross-sectional area and inhomogeneous magnetization, where the first and second spatial areas have distinct magnetic flux density ranges, allowing for the arrangement of magnetic-field sensor elements to optimize detection without overdriving, thereby increasing positional tolerance.
Abstract
An embodiment of a magnetic-field sensor includes a magnetic-field sensor arrangement and a magnetic body which has, for example, a non-convex cross-sectional area with regard to a cross-sectional plane running through the magnetic body, the magnetic body having an inhomogeneous magnetization.