Torque Sensor Using Ferromagnetic Resonance Frequency Shift
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Solution Overview
Problem
Existing methods for non-contact measurement of torque in rotating parts under alternating loads face challenges in direct electrical contact, necessitating real-time, efficient, and reliable measurement techniques.
Innovation Solution
A sensor device utilizing a ferromagnetic element with a measuring device to determine torque based on the ferromagnetic resonance frequency shift, which changes with applied torsional forces, allowing for efficient and cost-effective torque measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-contact measurement methods are used for rotating parts under alternating loads, then measurement reliability is improved, but measurement precision and efficiency deteriorate
Solution Approach 1:
The patent replaces traditional contact-based mechanical measurement systems with a non-contact magnetic field-based measurement system. A magnetic sensor detects changes in magnetic field characteristics caused by torsional forces on the rotating shaft, enabling reliable non-contact measurement while maintaining precision through magnetic field sensitivity rather than mechanical contact
Solution Approach 2:
The patent utilizes the magnetoelastic effect where mechanical stress (torque) changes the magnetic properties of a ferromagnetic material. By monitoring changes in magnetic permeability or resonance frequency of the ferromagnetic element under torsional load, the system converts mechanical parameters into magnetic field parameters for precise non-contact measurement
2Reliability
If non-contact measurement methods are used for rotating parts, then measurement reliability is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex contact-based measurement systems with a simpler non-contact magnetic sensing system. Instead of requiring physical contact with the rotating shaft, the system uses a magnetic sensor to detect magnetic field changes, reducing mechanical complexity while improving reliability through non-contact operation
Solution Approach 2:
The patent introduces a ferromagnetic element as an intermediary that converts torsional forces into magnetic field changes. This intermediary component enables the magnetic sensor to indirectly measure torque without direct contact with the rotating shaft, simplifying the overall measurement system while maintaining reliability
3Measurement precision
If traditional contact measurement methods are used, then measurement precision is improved, but reliability deteriorates due to direct electrical contact requirements
Solution Approach 1:
The patent replaces contact-based measurement systems with a non-contact magnetic field measurement system. The magnetic sensor detects torque through magnetic field changes induced by the ferromagnetic element, eliminating the need for direct electrical contact with rotating parts and thereby improving reliability while maintaining precision
Solution Approach 2:
The ferromagnetic element serves as an intermediary that translates mechanical torque into magnetic field variations. This allows the magnetic sensor to measure torque without direct contact with the rotating shaft, removing the reliability issues associated with direct electrical contact while preserving measurement precision
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
Enables real-time, accurate, and reliable measurement of torque applied to torque transmission devices, improving measurement efficiency and reliability.
Implementation Method 1
each measuring element is designed to measure a ferromagnetic resonant frequency of at least one ferromagnetic element
Implementation Method 2
the ferromagnetic resonant frequency changes with applied torsional forces
Data Source
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AI summary
The invention relates to a sensor device, comprising: at least one ferromagnetic element, which, in an operating state, can be arranged on a torque transmission apparatus; and a measuring apparatus, which has at least one measuring element. Each measuring element is designed to measure a ferromagnetic resonance frequency of at least one ferromagnetic element. The measuring apparatus is designed to determine a torque of the torque transmission apparatus on the basis of a shift in the measured ferromagnetic resonance frequency. The invention further relates to a method for determining a torque of a torque transmission apparatus.