Magnetic Sensor Device With Stripe Domain Soft Magnetic Structure
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Solution Overview
Problem
Magnetic sensors with soft magnetic structures suffer from reduced detection accuracy due to magnetic hysteresis characteristics, where residual magnetization from external fields affects readings at zero magnetic field, leading to hysteresis in detection values.
Innovation Solution
Incorporating a soft magnetic structure with a stripe domain structure, where at least part of the soft magnetic structure has a stripe domain configuration, to minimize the impact of magnetic hysteresis on the magnetic sensors, ensuring accurate detection by maintaining the magnetic field within a predetermined variable range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a soft magnetic structure is disposed horizontally close to the first magnetic sensor, then the magnetic sensor device can utilize the soft magnetic structure to convert magnetic field components, but the magnetic hysteresis characteristic of the soft magnetic structure causes the detection value of the first magnetic sensor to exhibit hysteresis, resulting in reduced detection accuracy
Solution Approach 1:
The patent applies parameter changes by modifying the magnetic characteristics of the soft magnetic structure through controlled magnetization processes. By adjusting the magnetization strength and direction parameters, the soft magnetic structure converts vertical magnetic field components into horizontal components while minimizing hysteresis effects, thus resolving the contradiction between field conversion capability and detection accuracy
Solution Approach 2:
The patent implements feedback by using the second magnetic sensor to detect the magnetization state of the soft magnetic structure and feed this information back to the control unit. The control unit then adjusts the magnetization of the soft magnetic structure to compensate for hysteresis effects, maintaining high detection accuracy while preserving magnetic field conversion functionality
2Power
If the soft magnetic structure has strong magnetization to effectively convert magnetic fields, then the magnetic field conversion efficiency is improved, but the residual magnetization at zero external field increases, causing greater deviation from ideal detection values and more pronounced hysteresis characteristics
Solution Approach 1:
The control unit uses feedback from the second magnetic sensor to monitor the magnetization state and dynamically adjusts the magnetization strength. This feedback mechanism allows the system to maintain strong magnetization for effective field conversion while actively compensating for residual magnetization that would otherwise cause detection errors at zero external field
Solution Approach 2:
The patent employs periodic action by applying alternating current demagnetization treatment to the soft magnetic structure. This periodic demagnetization process reduces residual magnetization and hysteresis effects while maintaining the structural integrity and magnetic properties needed for effective field conversion during normal operation
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 stripe domain structure in the soft magnetic structure reduces the magnetic hysteresis parameters, thereby minimizing the drop in detection accuracy and maintaining sensitivity across varying external magnetic field strengths, enhancing the overall performance of the magnetic sensor device.
Implementation Method 1
when the soft magnetic structure has a magnetization, a magnetic field based on the magnetization of the soft magnetic structure is applied to the first magnetic sensor
Implementation Method 2
If the soft magnetic structure has a magnetic hysteresis characteristic, once the soft magnetic structure has been magnetized by an external magnetic field, a certain amount of magnetization remains in the soft magnetic structure even after the external magnetic field becomes zero
Implementation Method 3
At least part of the soft magnetic structure has a stripe domain structure
Data Source
AI summary
A magnetic sensor device includes a magnetic sensor, and a soft magnetic structure disposed near the magnetic sensor. The magnetic sensor and the soft magnetic structure are configured so that when an external magnetic field including a detection-target magnetic field is applied to the magnetic sensor, the external magnetic field is also applied to the soft magnetic structure, and when the soft magnetic structure has a magnetization, a magnetic field based on the magnetization of the soft magnetic structure is applied to the magnetic sensor. The soft magnetic structure has a stripe domain structure.