Torque Sensor with Radial Magnetic Field Detection
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Solution Overview
Problem
Existing torque sensors face challenges in accurately measuring mechanical loads, such as torques and forces, on components like shafts due to rotational signal non-uniformity (RSN) and dependency on magnetic field changes, requiring improved designs for reliable and high-accuracy measurements.
Innovation Solution
The solution involves an arrangement with sensor elements comprising a magnetic field generation device and a detection device on a test object, specifically a shaft, where the sensor elements are arranged on a measurement surface extending radially or transversely to the longitudinal direction, using printed circuit board technology with multiple coils for precise torque measurement, and additional inductors for distance measurement and RSN compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor elements are arranged on a measurement surface extending radially or transversely to the longitudinal direction of the test object, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The measurement system is divided into multiple sensor elements, each with its own magnetic field generation device and detection device. These sensor elements are distributed across the measurement surface, allowing the system to capture magnetic field changes from multiple locations simultaneously, thereby improving measurement precision while managing complexity through modular design
Solution Approach 2:
The measurement surface extends in at least one directional component radially and/or transversely to the longitudinal direction of the test object, adding spatial dimensions to the measurement approach. This multi-dimensional arrangement enables more comprehensive detection of magnetic field changes related to mechanical loads
2Reliability
If multiple sensor elements with magnetic field generation and detection devices are used, then reliability of measurement is improved, but device complexity increases
Solution Approach 1:
Multiple sensor elements are integrated onto a single carrier plate that can be mounted on the test object. The carrier plate provides a unified structure housing multiple sensor elements, each comprising magnetic field generation devices and detection devices, thereby improving reliability through redundancy while managing complexity through consolidation
Solution Approach 2:
The sensor elements are designed with universal functionality, where each element contains both magnetic field generation and detection capabilities. This multi-functional design allows a single sensor element structure to perform multiple measurement functions, improving reliability without proportionally increasing overall device complexity
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 approach enables reliable and accurate measurement of mechanical loads by compensating for RSN effects and ensuring high precision in detecting changes in the magnetic field, enhancing the reliability of torque measurement on shafts.
Implementation Method 1
at least one sensor element (18) with a magnetic field generation device (20) for generating a magnetic field in the test object (14)
Implementation Method 2
a magnetic field detection device (22) for measuring a change in the magnetic field in the test object (14)
Data Source
AI summary
The invention relates to an arrangement (100) for measuring a mechanical load on a test object, with the detection of changes in the magnetic field, said arrangement comprising a test object (14), which extends in a longitudinal direction L, and at least one sensor element (18) comprising a magnetic field generation device (20) for generating a magnetic field in the test object (14) and a magnetic field detection device (22) for measuring a change in the magnetic field in the test object (14). The sensor element (18) is arranged on a measurement surface (15) of the test object (14), at least one directional component of said measurement surface extending radially and/or transversely to the longitudinal direction L of the test object (14). A magnetic field is generated in the test object (14) and a change in the magnetic field in the test object (14) is measured on the measurement surface (15). The load measured is, in particular, a torque.