Box-Shaped Magnet with Diagonal Magnetization for Linear Pressure Sensing
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Solution Overview
Problem
Conventional pressure sensors using permanent magnets suffer from non-linearity in magnetic flux density, leading to inaccurate position measurement and control due to distorted position information, which results in inefficient operation of devices and facilities.
Innovation Solution
A pressure sensor employing a box-shaped magnet with N and S poles magnetized along a diagonal direction, producing linear magnetic flux density along a straight line parallel to the polar surface, allowing for precise displacement measurement and pressure detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional permanent magnet is used to detect position, then the sensor structure is simple, but the magnetic flux density is non-linear leading to inaccurate position measurement
Solution Approach 1:
The patent applies asymmetry by designing a magnet with non-uniform magnetization distribution. Specifically, the magnet has different magnetization strengths in different regions (stronger at edges, weaker at center) to compensate for the non-linear magnetic flux density distribution. This asymmetric magnetization pattern allows the Hall sensor to receive a more linear magnetic signal, improving position measurement accuracy without adding mechanical complexity to the overall device structure.
Solution Approach 2:
The patent changes the magnetization parameters of the permanent magnet to achieve linear magnetic flux density distribution. By adjusting the magnetization strength distribution (making it non-uniform with stronger edge regions), the patent transforms the inherently non-linear magnetic field into a more linear one, enabling accurate position detection without requiring complex compensation circuits or algorithms.
2Device complexity
If a Hall sensor is used to measure distance from a permanent magnet, then the device structure is simple, but the non-linear magnetic flux density requires compensation programs or electronic circuits
Solution Approach 1:
The patent makes the magnet self-correcting by embedding the compensation function within the magnet's magnetization pattern itself. The non-uniform magnetization distribution automatically compensates for the non-linear magnetic flux density, eliminating the need for external compensation programs or electronic circuits. The system serves itself through the specially designed magnet structure, maintaining simplicity while achieving accuracy.
3Ease of manufacture
If magnets with non-linear magnetic flux density are used, then manufacturing is easier, but position information becomes distorted leading to inefficient operation
Solution Approach 1:
The patent changes the magnetization parameters during manufacturing to create a non-uniform distribution pattern. This allows the magnet to be manufactured using conventional techniques while achieving the desired non-linear compensation effect. The parameter change is implemented in the magnetization strength distribution rather than requiring complex geometric shaping, maintaining ease of manufacture while improving reliability.
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 pressure difference measurement and control, overcoming the limitations of non-linearity in conventional sensors by ensuring precise positional information and improved device operation.
Implementation Method 1
a box-shaped magnet, wherein the magnet comprises N and S poles magnetized along a sine wave oriented in a diagonal direction, and has linear magnetic flux density oriented along a straight line spaced apart from and parallel to a polar surface of the magnet
Implementation Method 2
A magnetic sensor, spaced a predetermined distance apart from and parallel to an N or S pole surface of the magnet
Data Source
AI summary
The invention relates to a pressure sensor capable of measuring pressure accurately, and more particularly, to a pressure sensor comprising a box-shaped magnet, optionally having an inclined upper surface with a right side portion protruding higher than a left side portion, wherein the magnet is configured to radiate linear magnetic flux density in response to a change in distance along a straight line spaced uniformly apart from an N or S pole surface, whereby the pressure sensor can accurately detect a displacement in distance (position) and thus a pressure difference based on the displacement. The pressure sensor further includes a pipe connecting negative and positive pressures, a diaphragm movable in response to a difference between negative and positive pressures, a diaphragm support attached to a side of the diaphragm, a magnet attached to the diaphragm support to radiate linear magnetic flux density, a spring supporting the magnet, and the diaphragm and upper and lower cases housing these components.