Magnetic Collector Layout for Linear Position Sensing
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Solution Overview
Problem
Conventional sensing devices for electric steering structures have high manufacturing costs due to numerous components and suffer from non-linear measurement of magnetic flux density, leading to reduced accuracy.
Innovation Solution
A sensing device design that includes a magnet with specific pole configurations and a collector with strategically positioned leg parts and sensors, allowing for shared components and improved linearity of Gauss value measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional sensing device uses multiple coils and a tube structure to detect rack bar position, then the detection function is achieved, but the manufacturing cost increases due to the large number of components
Solution Approach 1:
The patent merges the magnet and collector into an integrated unit where the collector includes first, second, and third leg parts that work together with the magnet to detect position. This integration reduces the number of separate components while maintaining the detection function, directly resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The collector structure serves multiple functions: it provides a magnetic path for the magnet, supports the sensors, and enables position detection through its geometric relationship with the magnet. This multi-functionality allows the same component to achieve detection accuracy without requiring additional separate parts, thus reducing overall device complexity
2Ease of operation
If a conventional sensing device measures magnetic flux density change to detect magnet position, then position detection is enabled, but the Gauss value is measured non-linearly reducing measurement accuracy
Solution Approach 1:
The patent creates different local magnetic environments by positioning the first sensor between the first and third leg parts, and the second sensor between the second and third leg parts. This local differentiation in magnetic flux paths enables linear Gauss value measurement while maintaining simple detection operation, resolving the contradiction between ease of operation and measurement precision
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
Reduces manufacturing costs by minimizing components and enhances measurement accuracy through linear Gauss value detection.
Implementation Method 1
the sensing device includes a magnet, a collector disposed to correspond to a path along which the magnet moves, and a first sensor disposed in the collector
Implementation Method 2
the sensing device detects a position of the rack bar through an induced magnetic field between the coils and the magnet
Data Source
AI summary
An embodiment provides a sensing device comprising: a magnet; a collector arranged to correspond to a path along which the magnet moves; and a first sensor disposed in the collector, wherein: the collector comprises a first leg part, a second leg part, and a third leg part; the magnet includes a first pole and a second pole; the first leg part and the second leg part are arranged to be opposite to the first pole; and the third leg part is arranged to be opposite to the second pole.