Angle Sensor Reducing Angular Error via Composite Magnetic Field Detection
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Solution Overview
Problem
Existing angle sensors face substantial limitations in reducing angular errors caused by noise magnetic fields without restricting their structure or installation, as they require specific magnetic field generation units and limited detection unit placements.
Innovation Solution
An angle sensor system that includes multiple composite magnetic field information generation units and an angle computing unit, which detect composite magnetic fields at different positions to generate information on direction and strength, using the method of least squares to calculate the detected angle value, thereby reducing angular errors without structural or installation constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a rotating magnetic field is used to reduce angular error, then measurement precision is improved, but device complexity increases and installation flexibility is reduced
Solution Approach 1:
The patent divides the detection system into multiple independent detection circuits (first, second, third, and fourth detection circuits) positioned at different locations. Each circuit independently detects the composite magnetic field at its position, and the control unit processes these segmented measurements to calculate the target angle. This segmentation allows the system to reduce angular error through multiple measurements without requiring a complex rotating magnetic field generation unit.
2Measurement precision
If detection units are positioned at specific locations to reduce angular error, then measurement precision is improved, but adaptability is reduced
Solution Approach 1:
The patent employs a control unit that can process detection signals from multiple detection circuits positioned at various locations. The control unit is designed to handle composite magnetic field measurements from different positions and calculate the target angle using a standardized algorithm. This universal processing capability allows the system to maintain high measurement precision while adapting to different installation configurations and positions.
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 reduces angular errors caused by noise magnetic fields while maintaining flexibility in structure and installation, improving accuracy and reliability of angle detection.
Implementation Method 1
Each of the plurality of detection circuits detects a magnetic field to be detected but also a noise magnetic field other than the magnetic field to be detected
Data Source
AI summary
An angle sensor includes a plurality of composite magnetic field information generation units and an angle computing unit. The plurality of composite magnetic field information generation units detect, at a plurality of detection positions, a composite magnetic field of a magnetic field to be detected and a noise magnetic field other than the magnetic field to be detected, and thereby generate a plurality of pieces of composite magnetic field information including information on at least the direction, out of the direction and the strength, of the composite magnetic field. At each of the plurality of detection positions, the magnetic field to be detected varies in direction according to an angle to be detected. The angle computing unit generates a detected angle value using the method of least squares on the basis of the plurality of pieces of composite magnetic field information.