Magnetic Detection Module for Compact Absolute Position and Angle Sensing
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Solution Overview
Problem
Existing magnetic detection devices for rotating bodies and linear motion bodies often require multiple components and are not configured compactly, making them unsuitable for environments with disturbances such as dust and light, and they struggle to provide absolute position or angle detection efficiently.
Innovation Solution
A magnetic detection device with a compact design using a rotating body or linear motion body with projecting portions and a magnetic detection module that includes a first and second detection unit, a magnet, and a yoke to detect changes in magnetism, allowing for absolute position or angle detection with a minimal number of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple components are used for magnetic detection, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple detection functions into a single integrated magnetic detection device. The first and second detection units, along with the magnet and yoke, are integrated into one compact structure that simultaneously performs absolute position detection and angle detection, eliminating the need for separate detection devices for each function.
Solution Approach 2:
The magnetic detection device is designed to perform multiple functions using a single system. It can detect both the absolute position of the moving body and the rotation angle of the rotating body, making it a universal detection solution that replaces multiple specialized devices.
2Volume of moving object
If a compact design is implemented, then device size is reduced, but detection precision may deteriorate
Solution Approach 1:
The patent arranges the first and second detection units, magnet, and yoke in a specific spatial configuration along one direction. This dimensional arrangement allows the detection components to be closely spaced while maintaining adequate magnetic field interaction, achieving compactness without sacrificing detection precision.
Solution Approach 2:
The magnetic detection device employs a nested structure where the magnet and yoke are positioned within the magnetic detection module, and the first and second detection units are arranged around them. This nested arrangement maximizes space utilization and achieves a compact design while preserving detection accuracy.
3Device complexity
If magnetic detection components are arranged closely, then device compactness is improved, but magnetic interference increases
Solution Approach 1:
The yoke serves as an intermediary component that guides and controls the magnetic flux between the magnet and the detection units. By introducing this intermediary, the patent manages magnetic field distribution and reduces unwanted magnetic interference while maintaining close component spacing for compactness.
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 enables accurate and compact magnetic detection systems that can operate effectively in dusty environments, providing precise absolute position and angle measurements with reduced component count.
Implementation Method 1
the first detection unit detects a change in magnetism from the magnet occurring when a first projection row, which is constituted by at least one projecting portion provided on a moving body, passes between the first detection unit and the magnet as the moving body moves, and the second detection unit detects a change in the magnetism from the magnet occurring when a second projection row, which is constituted by at least one projecting portion provided on the moving body, passes between the magnet and the second detection unit as the moving body moves
Data Source
AI summary
A magnetic detection device includes a first detection unit, a magnet, and a second detection unit, which are arranged in order along one direction. The first detection unit detects a change in magnetism from the magnet occurring when a first projection row, which is constituted by at least one projecting portion provided on a moving body, passes between the first detection unit and the magnet as the moving body moves, and the second detection unit detects a change in the magnetism from the magnet occurring when a second projection row, which is constituted by at least one projecting portion provided on the moving body, passes between the magnet and the second detection unit as the moving body moves.