Linear-Flux Magnet Pattern for Error-Free Displacement Measurement
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Solution Overview
Problem
Conventional magnets with non-linear magnetic flux density make it difficult to accurately measure displacement using magnetic flux sensors, requiring complex error correction processes and resulting in unreliable distance measurements.
Innovation Solution
A magnet with a rectangular shape and sinusoidal wave magnetization pattern along the diagonal direction is used, allowing the magnetic flux density to vary linearly with displacement, enabling accurate distance measurement by a sensor parallel to the magnet's surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional permanent magnet is used, then the device structure is simple, but the magnetic flux density varies non-linearly with distance requiring complex error correction
Solution Approach 1:
The magnet is designed with non-uniform pole surface areas where the N-pole and S-pole have different surface areas. This local variation in pole geometry creates a magnetic flux density distribution that varies linearly with distance in a specific measurement range, eliminating the need for error correction while maintaining simple device structure
Solution Approach 2:
The invention changes the geometric parameters of the magnet poles, specifically making the N-pole and S-pole have different surface areas. This parameter modification transforms the magnetic flux density characteristic from non-linear to linear within a specific distance range, solving the measurement accuracy problem without increasing device complexity
2Measurement precision
If multiple magnets are combined to achieve linear magnetic flux density, then measurement accuracy improves, but the device structure becomes complex
Solution Approach 1:
Instead of combining multiple magnets, the invention achieves linear magnetic flux density by creating local quality differences within a single magnet structure. The N-pole and S-pole are designed with different surface areas, producing the desired linear magnetic characteristic while maintaining simple single-magnet structure
Solution Approach 2:
A single magnet with asymmetric pole areas performs the function that would otherwise require multiple magnets. The different pole surface areas create distinct magnetic flux distributions that collectively achieve linear variation with distance, simplifying the overall device structure while maintaining measurement accuracy
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 eliminates error correction processes and improves measurement accuracy by maintaining linearity over a specific interval, enhancing the reliability of distance detection.
Implementation Method 1
The space affected by the magnetic force is called a magnetic field. In other words, it can be said that the magnet generates the magnetic field.
Implementation Method 2
The term 'magnetic flux' refers to an amount obtained by performing integration on a sectional area perpendicular to the direction of magnetic flux density or magnetic induction.
Implementation Method 3
When a magnetic flux passing though coil varies with time, a voltage that is proportional to the variation rate thereof is induced between both ends of the coil (Faraday' electromagnetic induction law).
Implementation Method 4
The hall sensor operates in such a way that, when a magnetic field is applied in a direction perpendicular to a semiconductor device (hall device) while current flows through the electrodes of the semiconductor device (hall device), an electric potential is generated to be perpendicular to the directions of the current and the magnetic field.
Data Source
AI summary
The present invention relates to a magnet having a linear magnetic flux density, which causes the magnetic flux density thereof to vary linearly and, more particularly, to a magnet having a linear magnetic flux density, in which the shape and magnetization pattern of the magnet are changed so that displacement in proportion to linearly varying displacement from the magnet is more accurately measured using a magnetic flux sensor, thus causing the magnetic flux density to vary linearly (or rectilinearly) according to the displacement. The present invention is configured to have a rectangular shape or a trapezoid shape so that displacement in proportion to linearly varying displacement from the magnet is more accurately measured using a magnetic flux sensor, and is configured such that the value of magnetic flux density varies linearly (rectilinearly) according to the magnetization pattern of the rectangular shape or a trapezoid shape.