Planar Magnetoelastic Force Sensor Design
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Solution Overview
Problem
Existing magnetoelastic sensors are limited in their ability to effectively measure compressive, tensile, and bending forces due to their cylindrical shape and magnetization methods, which restrict their application in various mechanical processes.
Innovation Solution
A flat metal carrier with magnetizable surfaces, magnetized using a permanent magnet to create a circular or annular magnetic track, is used in conjunction with sensor coils arranged at predetermined angles to detect changes in the magnetic field caused by applied forces, allowing for the differentiation of compressive, tensile, and bending stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a cylindrical carrier is used with traditional magnetization methods, then the sensor structure is simple, but the ability to differentiate between compressive, tensile, and bending forces is limited
Solution Approach 1:
The patent transitions from a cylindrical carrier to a planar carrier with magnetizable surfaces, changing the geometric dimension from 3D cylindrical to 2D planar. This dimensional change enables the creation of multiple magnetic tracks on different surfaces, allowing differentiation between various force types (compressive, tensile, bending) that were not possible with the simple cylindrical structure.
Solution Approach 2:
The planar carrier is divided into multiple magnetizable surfaces, each capable of carrying independent magnetic tracks. This segmentation allows each surface to be magnetized separately with specific magnetic track configurations, enabling the sensor to detect different force components independently and combine them for comprehensive force measurement.
2Adaptability or versatility
If multiple magnetizable surfaces are used on the carrier, then force measurement versatility improves, but manufacturing complexity increases
Solution Approach 1:
The planar carrier design with multiple magnetizable surfaces serves multiple functions simultaneously: it provides structural support, carries multiple independent magnetic tracks on different surfaces, and enables detection of various force types. This multi-functionality consolidates what would otherwise require multiple separate components into a single integrated carrier, simplifying the overall manufacturing process despite the increased measurement capabilities.
3Measurement precision
If traditional cylindrical magnetization is used, then the magnetization process is simple, but measurement precision for different force types is insufficient
Solution Approach 1:
Different regions of the planar carrier surfaces are magnetized with specific local magnetic track configurations tailored to detect particular force components. Each magnetizable surface can have customized magnetic track patterns optimized for specific measurement requirements, allowing high precision force type differentiation while maintaining a relatively simple overall magnetization process using standard techniques.
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 enables precise measurement of forces, enhancing the sensitivity and accuracy of the sensor, allowing it to function as a versatile compression, tension, and bending sensor, suitable for various industrial applications.
Implementation Method 1
at least one magnetizable flat metal surface is magnetized, in particular by means of a permanent magnet, such that a magnetic track is generated on the carrier
Implementation Method 2
In the event that a compressive force, a tensile force or a bending force acts on the carrier, the stress is transmitted via the magnetized surface of the carrier
Implementation Method 3
sensor coils arranged at predetermined angles to detect changes in the magnetic field caused by applied forces
Data Source
AI summary
A sensor is configured to detect a tensile, compressive and/or bending forces acting on a carrier (1, 1′) of the sensor. The carrier (1,1′) has at least one planar magnetizable surface (2). The sensor (13) comprises at least two sensor coils (12, 15) which are arranged at a predetermined angle to a longitudinal axis (14) of the carrier (1, 1′). The sensor (13) may be positioned on either side of the carrier (1, 1′). The sensor (13) is capable of detecting changes of the magnetisation due to tensile, compressive and/or bending forces acting on the carrier (1, 1′).