Hollow Cylindrical Magnet for Magnetic Angle Encoder
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Solution Overview
Problem
Existing magnetic angle encoders for electronic water meters are not compatible with tunneling magnetoresistive sensors due to differences in magnetic field detection orientation and cylindrical permanent magnet designs, which hinder accurate angle measurement and integration within counting wheels.
Innovation Solution
A cylindrical ring permanent magnet design with magnetization units oriented in antiparallel directions, producing a magnetic field component parallel to the detection plane, allowing a linear relationship between the magnetic phase angle and physical rotation angle, suitable for tunneling magnetoresistive sensors, and adaptable for embedding within counting wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a solid cylindrical permanent magnet is used, then the magnetic field is strong, but it cannot be installed within the counting wheel since the axle must pass through the center
Solution Approach 1:
The permanent magnet is segmented into a hollow cylindrical structure with an axial bore, dividing the solid magnet into a configuration that accommodates the counting wheel axle while maintaining magnetic functionality. This segmentation allows the magnet to be installed within the counting wheel without requiring the axle to pass through the magnet itself.
2Device complexity
If existing permanent magnet designs are used, then the structure is simple, but they are not compatible with tunneling magnetoresistive sensors which detect magnetic field components parallel to the sensor surface
Solution Approach 1:
The permanent magnet employs localized magnetization regions with specific orientation patterns that create magnetic field components parallel to the detection plane. By configuring magnetized regions to produce the required field orientation, the magnet becomes compatible with tunneling magnetoresistive sensors while maintaining structural simplicity.
3Force
If the permanent magnet is positioned close to the sensor, then the magnetic field signal is strong, but the space for sensor installation is limited
Solution Approach 1:
The hollow cylindrical magnet structure utilizes the axial dimension to create magnetic field components that extend parallel to the detection plane. This dimensional approach allows the magnet to generate sufficient magnetic field strength while providing adequate radial and axial clearance for sensor installation, effectively using three-dimensional space optimization.
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 design enhances measurement accuracy, reduces space requirements, and ensures compatibility with tunneling magnetoresistive sensors, enabling precise angle measurement and improved performance in electronic water meters.
Implementation Method 1
A cylindrical ring permanent magnet design with magnetization units oriented in antiparallel directions, producing a magnetic field component parallel to the detection plane
Implementation Method 2
tunneling magnetoresistive sensors detect the magnetic field component parallel to the surface of the sensor
Data Source
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Figure 6~7
AI summary
The present invention relates to a permanent magnet suitable for a magnetic angle encoder. The permanent magnet (100, 300) has a cylindrical ring structure and comprises a first permanent magnet unit (101, 301) and a second permanent magnet unit (102, 302). The first permanent magnet unit (101, 301) and the second permanent magnet unit (102, 302) are geometrically symmetrical with respect to a diametral cross section (110, 310). The magnetization intensity (103, 303) of the first permanent magnet unit (101, 301) and the magnetization intensity (104, 304) of the second permanent magnet unit (102, 302) are parallel to the axial direction of the cylindrical ring and are in opposite directions, or the magnetization intensity (103, 303) of the first permanent magnet unit (101, 301) and the magnetization intensity (104, 304) of the second permanent magnet unit (102, 302) are perpendicular to the diametral cross section (110, 310) and are parallel to one another and in the same direction.