Magnetic Flow Recorder Radial Field Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing magnetic flow recording devices face challenges with X-Y magnetoresistive angle sensors due to limited spatial flexibility and vulnerability to magnetic interference, which affects accurate angle measurements in environments with dust, oil, or nearby magnets.
Innovation Solution
The use of biaxial magnetoresistive angle sensors, including dual Z-axis or X-axis sensors with a phase difference of 90 degrees or a single X-Z biaxial magnetoresistive angle sensor, positioned outside the circular permanent magnet encoder to measure the radial rotating magnetic field, enhancing mounting flexibility and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If X-Y magnetoresistive angle sensor chip is used to measure angular position, then angle measurement capability is achieved, but mounting space is limited and spatial flexibility is poor
Solution Approach 1:
The patent transitions from planar X-Y magnetoresistive sensors to three-dimensional radial magnetic field sensing. The sensor measures magnetic field components in the radial direction perpendicular to the rotating wheel face, enabling angular position measurement with improved spatial flexibility and mounting options.
Solution Approach 2:
The patent introduces a radial magnetic field as an intermediary between the rotating wheel and the sensor. By measuring the radial magnetic field components generated by permanent magnets on the rotating wheel, the system achieves angle measurement without direct contact or limited mounting constraints.
2Measurement precision
If X-Y magnetoresistive angle sensor is positioned above the circular permanent magnet encoder, then angle measurement is possible, but the measurement is vulnerable to interference from nearby magnets
Solution Approach 1:
The patent uses the radial magnetic field as an intermediary measurement medium. By measuring magnetic field components in the radial direction rather than the planar X-Y directions, the system reduces sensitivity to interference from nearby magnets and soft magnetic materials.
Solution Approach 2:
The patent measures magnetic field components at specific locations and orientations (radial direction perpendicular to the wheel face) rather than using planar sensors above the encoder. This localized radial measurement approach reduces vulnerability to magnetic interference from surrounding components.
3Measurement precision
If grating technology is used to detect rotation angle, then direct reading flow recording is achieved, but high environmental requirements are needed (clean environment free of oil, smoke, gas, and dust)
Solution Approach 1:
The patent replaces optical grating technology with magnetic field-based sensing. Instead of using light transmission through gratings that require clean environments, the system uses magnetoresistive sensors to detect radial magnetic field components, eliminating the need for cleanroom conditions and making the system robust to environmental contamination.
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 improves the flexibility and stability of angle measurements, reducing interference from adjacent magnets and allowing for accurate recording of water flow with low power consumption.
Implementation Method 1
biaxial magnetoresistive angle sensor measures the radial rotating magnetic field generated at the outer edge of the round face of a circular permanent magnetic rotating wheel
Implementation Method 2
measures the radial rotating magnetic field generated at the outer edge of the round face of a circular permanent magnetic rotating wheel
Data Source
AI summary
An automatic magnetic flow recording device, comprises a multitude of coaxially disposed hard magnetic rotating wheels wherein the hard magnetic rotating wheels are circular, and rotate with respect to each other by a predetermined transmission ratio. Each hard magnetic rotating wheel has at least one corresponding biaxial magnetoresistive angle sensor. The biaxial magnetoresistive angle sensors measure the angular positions of the hard magnetic rotating wheels within the range of 0-360 degrees. The biaxial magnetoresistive angle sensors comprise two single-axis linear magnetoresistive sensors, wherein the single-axis linear magnetoresistive sensors are an X-axis magnetoresistive sensor or a Z-axis magnetoresistive sensor. The X-axis magnetoresistive sensor of the hard magnetic rotating wheel measures a magnetic field component parallel to the tangent of the circumference of the hard magnetic rotating wheel. The Z-axis magnetoresistive sensor of the hard magnetic rotating wheel measures a magnetic field component along the radial direction of the hard magnetic rotating wheel. This flow meter recording device has several advantages compared to electronic flow meters with X, Y biaxial angle sensor. These include flexibility of the mounting position, small adjacent hard magnetic rotating wheel interference, and low power consumption.