Micro-fluxgate Sensor Double-iron Core Miniaturization
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Solution Overview
Problem
Existing micro-fluxgate sensors are large in size, costly, prone to assembly errors, and affected by temperature and mechanical vibrations, with complex processing circuits that are difficult to miniaturize.
Innovation Solution
A micro-fluxgate sensor design featuring a double-iron core assembly with reverse excitation field directions, a self-oscillating module, a current superimposing and amplifying module, and a voltage acquisition module, which simplifies signal processing and reduces probe size by counteracting excitation currents and extracting non-spike signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a three-dimensional solenoid coil is wound on a strip-shaped magnetic core, then the manufacturing process is simple, but the volume size is large and the volume production cost is high
Solution Approach 1:
The patent divides the traditional single bulky magnetic core into multiple thin film magnetic core layers, reducing the overall volume while maintaining functionality. The segmentation of the core structure allows for miniaturization without compromising the manufacturing simplicity of the winding process.
Solution Approach 2:
The patent employs thin film magnetic cores instead of traditional thick magnetic cores, significantly reducing the volume size of the fluxgate probe. The thin film structure maintains ease of manufacture through standard thin film deposition techniques while achieving compact dimensions.
2Ease of manufacture
If a three-dimensional solenoid coil is wound on a strip-shaped magnetic core, then the manufacturing process is simple, but the assembly error is large and the matching degree of the iron core and winding is poor
Solution Approach 1:
The patent combines the magnetic core and winding structure into an integrated thin film configuration, reducing assembly errors by minimizing the number of separate components. The integration of core and winding in a planar geometry improves matching degree while maintaining manufacturing simplicity through batch processing techniques.
Solution Approach 2:
The patent replaces traditional mechanical winding processes with thin film deposition and patterning techniques, eliminating assembly errors associated with manual or automated winding. The mechanical assembly step is substituted with a more precise thin film fabrication process that ensures better matching between core and winding.
3Reliability
If the fluxgate probe is affected by temperature, stress and mechanical vibration, then the output error is larger, but frequent calibration is required
Solution Approach 1:
The patent modifies the physical parameters of the magnetic core by using thin film materials with controlled magnetic properties, stress characteristics, and thermal expansion coefficients. These parameter changes make the probe less sensitive to temperature, stress, and vibration, reducing output error and calibration frequency.
Solution Approach 2:
The patent uses composite thin film structures combining different magnetic and non-magnetic materials to create a probe that is inherently resistant to temperature, stress, and mechanical vibration. The composite structure compensates for environmental effects, improving reliability and reducing calibration needs.
4Difficulty of detecting and measuring
If complex processing circuits with frequency selecting amplification, phase-sensitive rectification, and integral circuits are used, then signal processing capability is achieved, but the circuit is large in occupied space and extremely difficult to miniaturize
Solution Approach 1:
The patent extracts and removes unnecessary complex processing circuit components such as frequency selecting amplification circuits, phase-sensitive rectification circuits, and integral circuits. By taking out these redundant elements, the circuit space is significantly reduced while retaining essential signal processing capabilities through simplified architecture.
Solution Approach 2:
The patent implements a universal simplified processing circuit that performs multiple functions with a single integrated structure, replacing multiple specialized circuits. This multi-functional approach reduces the total occupied space while maintaining signal processing capability through clever circuit design that combines detection, amplification, and processing in one compact unit.
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 design allows for miniaturization of the circuit, reduced assembly errors, improved resistance to temperature and mechanical vibrations, and simplified processing, enabling sensitive magnetic field detection without the need for complex circuitry.
Implementation Method 1
the first winding coil and the second winding coil are respectively connected with an input end of the self-oscillating module, and an output end of the self-oscillating module is respectively connected with the current superimposing and amplifying module and the voltage acquisition module; and the current superimposing and amplifying module is connected with the voltage acquisition module
Implementation Method 2
the self-oscillating module is configured to turn over a square wave of the first winding coil and a square wave of the second winding coil by detecting a current value of the first winding coil, output a modulated square wave of the first winding coil and a modulated square wave of the second winding coil and drive the first winding coil and the second winding coil
Implementation Method 3
the current superimposing and amplifying module is configured to acquire a current output by the self-oscillating module, counteract excitation currents of the first winding coil and the second winding coil by superimposing the current, and send the current that is not counteracted to the voltage acquisition module
Implementation Method 4
the voltage acquisition module is configured to receive the current that is not counteracted, the modulated square wave of the first winding coil and the modulated square wave of the second winding coil
Data Source
AI summary
A micro-fluxgate sensor has a double-iron core assembly, a self-oscillating module, a current superimposing and amplifying module and a voltage acquisition module. The double-iron core assembly comprises a first iron core and a second iron core. The first iron core is provided with a first winding coil. The second iron core is provided with a second winding coil. The first winding coil and the second winding coil are respectively connected with an input end of the self-oscillating module, and an output end of the self-oscillating module is respectively connected with the current superimposing and amplifying module and the voltage acquisition module. The fluxgate sensor is simple in processing circuit without manual debugging and is easily integrated.