Rotation Angle Sensor Layout for Compact High-Accuracy Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional rotation angle detection devices with multiple sensor units require increased size to maintain detection accuracy, leading to magnetic flux distortion and higher costs.
Innovation Solution
A detection device comprising a main detection element, a sub detection element, and a signal processing unit, where the main detection element is positioned closer to the detection center than the sub detection element, allowing for accurate detection while minimizing the overall size of the detection target by arranging the elements in specific configurations to optimize detection accuracy and reduce size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sensor units are used to maintain detection accuracy, then detection reliability is improved, but device size increases
Solution Approach 1:
The patent transitions from a planar arrangement of multiple sensor units to a three-dimensional configuration where sensor units are positioned at different radial distances from the detection center. The main sensor unit is placed closer to the center while sub sensor units are positioned farther away, utilizing the depth dimension to achieve both compact size and reliable detection through differential measurement
2Measurement precision
If larger magnets are used to improve detection accuracy, then measurement precision is improved, but device size and cost increase
Solution Approach 1:
The patent changes the spatial parameters of sensor unit arrangement, specifically the radial distances from the detection center. By positioning sensor units at optimized distances (main unit closer, sub units farther), the system achieves high detection accuracy with smaller magnets through differential measurement techniques that exploit magnetic field variations at different positions
3Measurement precision
If multiple detection elements are arranged to improve detection accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the detection function into distinct roles: a main sensor unit for primary detection and sub sensor units for differential measurement and error compensation. This segmentation allows each unit to be optimized for its specific function while maintaining overall system simplicity through clear functional differentiation
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 ensures high detection accuracy for the main detection element while suppressing the increase in size of the detection target, enabling efficient and precise rotation angle detection without the need for larger magnets, thus reducing costs and complexity.
Implementation Method 1
a main detection element that detects a physical quantity that changes according to a rotation of a detection target
Implementation Method 2
a sub detection element that detects a physical quantity that changes according to the rotation of the detection target
Data Source
AI summary
A main detection element detects a physical quantity that changes according to a rotation of a detection target. A sub detection element detects a physical quantity that changes according to the rotation of the detection target. A signal processing unit outputs main rotation information that is information corresponding to a detection value of the main detection element and sub rotation information that is information corresponding to a detection value of the sub detection element. A package seals the main detection element, the sub detection element, and the signal processing unit. Centers of all the main and the sub detection elements are arranged at positions shifted from a detection center of the detection target. The main detection element is arranged at a position closer to the detection center than the sub detection element. The package is arranged at a position where a center of the package deviates from the detection center.