Magnetic Sensor Signal Correction for Oblique-Field Distortion
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Solution Overview
Problem
Magnetic sensors with magnetoresistive effect elements exhibit distortion errors in their output signals when subjected to external magnetic fields that obliquely intersect their sensitivity axis, affecting signal linearity and accuracy.
Innovation Solution
A magnetic sensor with a signal correction unit that applies a correction value to reduce distortion errors using a formula (V′=V+V3×a) to stabilize the output signal, particularly when oblique magnetic fields are applied, by incorporating a magnetoresistive effect element with orthogonal sensitivity axes and a signal processing unit to correct the signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetoresistive effect element is used for position detection, then the sensor can detect magnetic fields and output signals, but distortion errors occur when magnetic fields obliquely intersect the sensitivity axis
Solution Approach 1:
The magnetic field detection is segmented into multiple orthogonal components using multiple magnetoresistive effect elements with different sensitivity axis orientations. By dividing the detection into orthogonal segments (X-axis and Y-axis sensitivity elements), the system can process oblique magnetic fields more accurately by combining the orthogonal components, thereby reducing distortion errors and improving signal linearity.
Solution Approach 2:
The patent transitions from single-axis detection to multi-dimensional detection by adding magnetoresistive effect elements with sensitivity axes in different directions (orthogonal dimensions). This dimensional expansion allows the system to detect and process magnetic fields from multiple orientations simultaneously, converting a one-dimensional sensitivity limitation into a multi-dimensional detection capability that eliminates distortion errors.
2Stability of the object's composition
If the sensitivity axis is fixed parallel to a first axis, then the magnetoresistive effect element can provide stable detection in that direction, but it cannot accurately detect magnetic fields in other directions
Solution Approach 1:
The magnetic sensor system achieves multi-functionality by incorporating magnetoresistive effect elements with sensitivity axes in multiple orthogonal directions. Each element maintains its stable single-axis detection capability while the combination of elements provides universal detection capability for magnetic fields in any direction, allowing the system to adapt to various application scenarios requiring different detection orientations.
Solution Approach 2:
The patent creates a composite sensing structure by combining multiple magnetoresistive effect elements with different sensitivity axis orientations. This composite configuration integrates the stable detection characteristics of each individual element while achieving enhanced directional detection capability, similar to how composite materials combine properties of constituent materials to achieve superior overall performance.
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 solution improves signal linearity and accuracy by halving distortion errors, ensuring consistent output regardless of the magnetic field's angle relative to the sensitivity axis, enhancing performance in applications like electronic compasses.
Implementation Method 1
a magnetoresistive effect element (MR element) whose resistance changes according to the angle formed by the magnetization direction of the free layer in accordance with an external magnetic field with respect to the magnetization direction of the magnetization fixed layer
Data Source
AI summary
A magnetic sensor includes a magnetic detection unit that outputs a signal by applying a magnetic field, and a signal correction unit that corrects the signal output from the magnetic detection unit. The magnetic detection unit includes a magnetoresistive effect element having a predetermined sensitivity axis. The signal correction unit generates a corrected signal by correcting the signal using a correction value capable of reducing the distortion error included in the signal output from the magnetic detection unit when the magnetic field having an intersecting direction that obliquely intersects the sensitivity axis is applied to the magnetoresistive effect element.