Magnetic Sensor Hysteresis Compensation via Soft Magnetic Structure
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Solution Overview
Problem
Conventional magnetic sensors with magnetic detection elements exhibit reduced accuracy due to hysteresis properties in their detection values, caused by residual magnetization in magnetic layers, leading to varying detection values when the external magnetic field becomes zero.
Innovation Solution
A magnetic sensor device comprising at least one first-type magnetic sensor and a soft magnetic structure, where the soft magnetic structure applies a magnetic field based on its residual magnetization to the magnetic sensor, reducing the hysteresis effect by aligning the sensors and soft magnetic structure in intersecting directions and using a magnetic-field conversion section to output perpendicular magnetic field components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic detection elements with magnetic layers are used to detect external magnetic fields, then the magnetic sensor can generate detection values corresponding to the external magnetic field, but the detection accuracy is degraded due to hysteresis property caused by residual magnetization in the magnetic layers
Solution Approach 1:
A soft magnetic structure is introduced as an intermediary between the external magnetic field and the magnetic detection element. This soft magnetic structure has specific magnetic properties that allow it to mediate the magnetic field interaction, reducing the direct impact of residual magnetization on the detection element and thereby minimizing hysteresis effects in the detection value
Solution Approach 2:
The magnetic properties of the soft magnetic structure are specifically designed and controlled to achieve desired hysteresis characteristics. By adjusting parameters such as saturation magnetization, coercivity, and remanence of the soft magnetic structure, the overall hysteresis behavior of the magnetic sensor is optimized to improve detection accuracy
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 configuration minimizes the difference between actual and ideal detection values at zero external magnetic field, enhancing detection accuracy by canceling out residual magnetic field components and reducing hysteresis-related errors.
Implementation Method 1
a hysteresis loop of its magnetization with varying external magnetic field indicates a residual magnetization
Implementation Method 2
The soft magnetic bodies convert vertical magnetic field components, which are in a direction parallel to the Z-axis, into horizontal magnetic field components in a direction perpendicular to the Z-axis
Data Source
AI summary
A magnetic sensor device includes a first magnetic sensor, a second magnetic sensor, and a soft magnetic structure. The first magnetic sensor generates a detection value corresponding to a component in a direction parallel to an X direction of an external magnetic field. The second magnetic sensor generates a detection value corresponding to a component in a direction parallel to a Y direction of the external magnetic field. In the presence of a residual magnetization in the X direction in the soft magnetic structure, a magnetic field that is based on the residual magnetization and contains a component in the −X direction is applied to the first magnetic sensor. In the presence of a residual magnetization in the Y direction in the soft magnetic structure, a magnetic field that is based on the residual magnetization and contains a component in the −Y direction is applied to the second magnetic sensor.