Magnetic Sensor Yoke and Shield Orthogonal Field Isolation
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Solution Overview
Problem
Magnetic sensors face errors and reduced sensitivity due to horizontal magnetic field components when detecting magnetic fields with components in directions different from the intended direction, as they are also affected by orthogonal magnetic field components.
Innovation Solution
A magnetic sensor system incorporating a magnetic field conversion unit and a shield made of soft magnetic material, where the magnetic field conversion unit converts input magnetic fields into output fields, and the shield absorbs orthogonal magnetic field components to minimize their impact on the detection unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic sensor uses magnetoresistive elements to detect magnetic fields, then it can detect magnetic field components in a direction parallel to the substrate surface, but it also detects orthogonal magnetic field components which cause detection errors and reduced sensitivity
Solution Approach 1:
The magnetic field detection is segmented into orthogonal components using multiple magnetoresistive elements arranged in specific patterns. By separating the detection of different magnetic field components (parallel and perpendicular to substrate) into distinct element groups, the system can selectively process and combine signals to eliminate interference from unwanted orthogonal components while maintaining sensitivity to the target magnetic field direction.
2Measurement precision
If a soft magnetic body is introduced to convert perpendicular magnetic field components into parallel components, then sensitivity to perpendicular fields is improved, but horizontal magnetic field components still affect the magnetoresistive elements causing detection errors
Solution Approach 1:
A soft magnetic body is introduced as an intermediary component between the magnet and the magnetoresistive elements. This soft magnetic body selectively channels and converts perpendicular magnetic field components into parallel components that the magnetoresistive elements can detect, while its magnetic properties prevent horizontal magnetic field components from reaching the elements, thus eliminating detection errors caused by such interference.
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 system effectively prevents errors and maintains sensitivity by isolating the detection unit from orthogonal magnetic field components, ensuring accurate detection of the intended magnetic field component.
Implementation Method 1
at least one shield formed of a soft magnetic material... absorbing orthogonal magnetic field components
Implementation Method 2
The at least one yoke is configured to receive an input magnetic field for the magnetic sensor and to output an output magnetic field
Data Source
AI summary
A magnetic sensor includes a magnetic field conversion unit, a magnetic field detection unit, and two shields. The magnetic field conversion unit includes a plurality of yokes. Each yoke is shaped to be long in a Y direction, and is configured to receive an input magnetic field and output an output magnetic field. The input magnetic field contains an input magnetic field component in a direction parallel to a Z direction, and a magnetic field component in a direction parallel to the Y direction. The output magnetic field contains an output magnetic field component in a direction parallel to an X direction. The magnetic field detection unit generates a detection value according to the output magnetic field component. Each shield has such a shape that its maximum dimension in the Y direction is smaller than its maximum dimension in the X direction.