Magnetic Sensor Angle Detection Noise Reduction
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Solution Overview
Problem
Existing magnetic sensors face challenges in accurately detecting angles due to the interference of noise magnetic fields, which can lead to errors in angle detection values.
Innovation Solution
A magnetic sensor system is designed with three magnetic detection elements positioned at specific angles relative to each other, each generating periodic detection signals. These signals are processed to reduce the effect of noise magnetic fields, thereby improving angle detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic detection elements are used to detect the target magnetic field, then angle detection capability is achieved, but noise magnetic fields cause errors in angle detection values
Solution Approach 1:
The magnetic detection system is divided into three separate magnetic detection elements positioned at different angular positions (0°, 120°, 240°). Each element detects the magnetic field independently, and the signals are processed separately before being combined. This segmentation allows the system to differentiate between the target magnetic field signal and noise magnetic field interference, improving angle detection accuracy in the presence of noise.
2Measurement precision
If three magnetic detection elements are arranged at different positions to reduce noise effect, then angle detection accuracy is improved, but device complexity increases
Solution Approach 1:
The three magnetic detection elements are positioned symmetrically at 0°, 120°, and 240° around the reference axis, creating an equipotential arrangement where each element experiences equivalent conditions relative to the target magnetic field. This symmetric positioning ensures that the combined signal from all three elements effectively cancels out noise magnetic field interference while maintaining a relatively simple device structure.
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 proposed solution effectively reduces the impact of noise magnetic fields, leading to more accurate angle detection values and enhanced reliability of magnetic sensor systems.
Implementation Method 1
a first magnetic detection element to detect a first partial magnetic field that is the target magnetic field at a first position away from the reference axis
Data Source
AI summary
A magnetic sensor includes first to third structural bodies having a structure for a magnetic detection element to detect a target magnetic field at first to third positions away from a reference axis, respectively, and first to third detection circuits including first to third magnetic detection elements, respectively. The second position is a position rotated from the first position by (120+360×m)° circumferentially about the reference axis. The third position is a position rotated from the first position by (240+360×n)° circumferentially about the reference axis.