Single Magnet Stroke Detection Yoke Design
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Solution Overview
Problem
Conventional stroke amount detection devices require a large number of components due to the use of two permanent magnets for detecting the stroke amount, increasing complexity and component count.
Innovation Solution
A stroke amount detection device with a yoke of magnetic material, a magnetic flux generation section, and a magnetism detection section, where the yoke is attached to a detection object and a holding part, and the magnetism detection section is positioned between the magnetic flux generation section and a protruding section of the yoke, allowing detection with a single magnetic flux generation section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two permanent magnets are used for repulsion-based detection, then detection function is achieved, but the number of components increases
Solution Approach 1:
The invention extracts and eliminates one of the two permanent magnets from the detection system. By using a single permanent magnet combined with a specifically shaped yoke (including a protruding section), the device achieves the same detection function with fewer components, directly resolving the contradiction between detection reliability and device complexity
Solution Approach 2:
The yoke structure is designed to perform multiple functions: it provides magnetic flux path, creates the protruding section for field modulation, and works with the single permanent magnet to achieve detection. This multi-functionality allows the system to maintain detection capability while reducing component count
2Reliability
If two permanent magnets are used for repulsion-based detection, then detection function is achieved, but manufacturing complexity increases
Solution Approach 1:
By removing one permanent magnet from the assembly, the invention eliminates the need for complex joint processes required to attach and align two magnets. The single magnet configuration significantly simplifies manufacturing while preserving the detection function through the yoke's geometric design
Solution Approach 2:
The yoke is designed with a specific local geometry (protruding section) that compensates for the reduced magnet count. This localized structural feature creates the necessary magnetic field modulation, allowing the system to maintain detection function with simpler manufacturing requirements
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
This configuration reduces the number of components needed, simplifies the device, and maintains high detection accuracy by utilizing a single permanent magnet, thereby reducing the number of processes required for assembly.
Implementation Method 1
The magnetism detection section outputs a signal in accordance with a magnetic flux density generated due to a relative movement of the yoke with respect to the magnetism detection section
Data Source
AI summary
A stroke amount detection device includes a yoke, a magnetic flux generation section, and a magnetism detection section. The yoke has a protruding section that protrudes to outside the yoke. The magnetic flux generation section is located in the yoke. The magnetism detection section is disposed between the magnetic flux generation section and the protruding section. The magnetism detection section is disposed at a fixed position with respect to the magnetic flux generation section. The magnetism detection section outputs a signal in accordance with a magnetic flux density generated due to a relative movement of the yoke with respect to the magnetism detection section.