Asymmetric Magnet Core Sensor for Noise Reduction
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Solution Overview
Problem
Existing magnetic field sensors with axially symmetric magnet cores suffer from noise due to pinning effects at defects and require increased energy consumption or longer measurement times, limiting the accuracy of magnetic field strength measurements.
Innovation Solution
The development of magnet cores with asymmetrical geometry and magnetic homogeneity, featuring sub-regions with controlled magnetization reversal, allows for targeted initiation of magnetic domain wall propagation, reducing noise without increasing energy consumption or measurement time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional axially symmetric magnet cores are used, then the sensor apparatus can operate with simple geometry, but noise increases due to pinning effects at defects
Solution Approach 1:
The patent applies asymmetry by introducing at least one opening in the magnet core that breaks the axial symmetry. This asymmetric structure creates controlled magnetic flux distribution that reduces pinning effects at defects and minimizes noise while maintaining manufacturing feasibility through standard fabrication processes.
Solution Approach 2:
The opening in the magnet core creates local variations in magnetic flux density, concentrating flux in specific regions while reducing it in others. This local quality modification allows controlled magnetization reversal initiation and reduces the impact of pinning effects at defects throughout the core.
2Measurement precision
If conventional magnet cores are used, then energy consumption can be maintained at low levels, but measurement precision decreases due to noise
Solution Approach 1:
The patent modifies the magnetic flux distribution parameter by introducing an opening in the magnet core. This changes the magnetic field parameters locally, creating regions with different flux densities that facilitate controlled magnetization reversal while maintaining low energy consumption through efficient flux utilization.
3Measurement precision
If conventional magnet cores are used, then the sensor can operate quickly, but measurement precision is limited by noise and pinning effects
Solution Approach 1:
The asymmetric opening structure in the magnet core creates controlled magnetic flux patterns that reduce pinning effects and noise. This allows for more precise measurements to be obtained quickly without sacrificing measurement speed, as the reduced noise floor enables faster detection of magnetic field changes.
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 approach enhances the drive force for magnetic domain wall propagation, minimizing noise and improving the accuracy of magnetic field strength measurements while maintaining low energy consumption.
Implementation Method 1
The sub-regions have an increased or reduced (magnetic) flux density as compared with adjoining neighboring sub-regions, so that a propagation/startup of magnetic domain walls is energetically favored at those regions
Implementation Method 2
By way of the advantageous embodiment of the magnet cores according to the present invention, the magnetic flux occurring at their interior is 'controllable' in such a way that a drive force/drive energy to be applied in order to propagate a magnetic domain wall is elevated
Data Source
AI summary
A sensor apparatus having at least one magnet core, on at least one carrier surface, which encompasses at least one soft magnetic material and for which a respective longitudinal center plane, which is oriented perpendicularly to the carrier surface and divides the respective magnet core into two halves having an identical mass, is definable, at least one coil being on, around, and/or adjacent to the at least one magnet core, the at least one magnet core having in its interior sub-regions by which an initiation of a magnetization reversal of the respective magnet core is targetedly locally controllable since a drive energy to be applied for propagation of a magnetic domain wall is elevated. Also described is a manufacturing method for a sensor apparatus having at least one magnet core, and a method for ascertaining a field strength of a magnetic field in at least one spatial direction.