Magnetoelastic Shear Force Sensor With Interference Field Compensation
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Solution Overview
Problem
Existing shear force transducers, particularly those using wire strain gauges, weaken the shear beam at measurement points, and magnetoelastic transducers face interference field issues that affect measurement accuracy.
Innovation Solution
A magnetoelastic shear force transducer with a hollow component section and annular magnetoelastically active sections, equipped with magnetic-field sensors and compensating sensors, is designed to minimize interference by optimizing sensor placement and signal processing, allowing for accurate shear stress measurement without plastic deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wire strain gauges are used to measure local deformations in the shear beam, then measurement capability is provided, but the shear beam is weakened at measurement points
Solution Approach 1:
The patent replaces wire strain gauges with a magnetoelastic sensing system that uses magnetic field measurements to detect shear stress. The magnetoelastically active section generates a magnetic field that changes in response to applied shear stress, allowing measurement without mechanical attachments that would weaken the structure.
2Strength
If magnetoelastic transducers are used for shear force measurement, then structural integrity is maintained, but interference fields affect measurement accuracy
Solution Approach 1:
The patent extracts the magnetoelastically active section as a separate component that can be magnetized independently. This allows the sensing function to be separated from the load-bearing structure, enabling the use of magnetic field compensation techniques to eliminate interference fields while maintaining structural integrity.
Solution Approach 2:
The patent introduces magnetic field compensation elements that act as intermediaries to cancel out interference fields. These compensation elements generate opposing magnetic fields that neutralize the effects of ferromagnetic materials and other sources of interference, thereby improving measurement accuracy.
3Measurement precision
If the hollow component section is designed to guide shear stress into the magnetoelastically active section, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the hollow component section with the magnetoelastically active section into an integrated structure. The hollow section serves both as a mechanical element for stress transmission and as a housing for the magnetoelastic sensing material, reducing overall device complexity while maintaining measurement capability.
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 precise measurement of shear forces with improved mechanical stress tolerance and reduced interference, enhancing the accuracy and reliability of shear force measurements in various applications.
Implementation Method 1
a mechanical stress of a body leads to a change in the magnetic field thereof in the magnetoelastic effect
Implementation Method 2
The hollow component section is configured such that a load can be applied thereon. The load causes the shear stress in the hollow component section.
Implementation Method 3
A further object of the invention is a method of determining an optimum position of a magnetic field compensating sensor in a magnetoelastic shear force transducer
Data Source
AI summary
A magnetoelastic shear force transducer with an interference field compensation comprises a hollow component section having an interior recess. A load can be applied onto the hollow component section. The load causes a shear stress in the hollow component section. The hollow component section includes at least one annular magnetoelastically active section having a magnetic polarization surrounding the recess and magnetoelastic properties. Magnetic-field sensors include at least one magnetic-field sensor in the magnetoelastically active section and a magnetic-field compensating sensor associated with the magnetic-field sensor in the magnetoelastically active section. The magnetic-field compensating sensor is arranged outside the magnetoelastically active section. A sensor signal of the magnetic-field sensor is processed along with a compensating signal of the magnetic-field compensating sensor to reduce the influence of an interfering magnetic field. A method of determining an optimum distance between the magnetic-field sensor and an associated magnetic-field compensating sensor is also disclosed.