Fluorescent Marking Structures for Rotating Part Temperature Sensing
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Solution Overview
Problem
Existing methods for monitoring the temperature of rotating parts in electrical machines lack precision, particularly for high-temperature environments, which can lead to damage if not accurately managed.
Innovation Solution
A contactless temperature recording method using fluorescent marking structures arranged in a ring-shaped configuration around the rotation axis, stimulated by a light source and detected by light sensors, allowing for precise temperature determination based on the temperature-dependent decay time constant of the fluorescent material, enabling accurate measurement up to 1000°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contactless temperature measurement is used for rotating parts, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent introduces fluorescent marking structures as an intermediary between the rotating part and the temperature measurement system. These structures are applied to the rotating part and contain temperature-sensitive fluorescent materials that emit light with characteristics varying according to temperature, enabling contactless temperature measurement without direct sensor contact with the rotating component
Solution Approach 2:
The patent utilizes temperature-dependent fluorescent properties of marking structures, where the fluorescent emission characteristics (intensity, wavelength, or decay time) change with temperature. This allows temperature measurement through optical detection of fluorescent signal variations, achieving precise contactless temperature monitoring
2Device complexity
If traditional temperature monitoring methods are used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent replaces mechanical or electrical temperature sensing methods with an optical-based fluorescent measurement system. Instead of using thermocouples or resistance temperature detectors that require physical contact and complex wiring on rotating parts, the system uses optical excitation and detection of fluorescent materials, simplifying the measurement system while improving precision
3Reliability
If contactless measurement method is implemented, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent divides the temperature measurement function into separate components: fluorescent marking structures applied to the rotating part, excitation light sources positioned externally, and detection sensors for receiving fluorescent signals. This segmentation allows each component to be optimized independently, with the marking structures being simple coatings or attachments that do not require high manufacturing 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
This method provides high-accuracy temperature measurement (1-5°C) without physical contact, reducing costs, compensating for performance drops, enhancing component protection, improving functional security, and reducing software application time and effort.
Implementation Method 1
a marking with fluorescent marking structures, which are arranged in at least one ring-shaped arrangement around the axis of rotation distributed on the rotating part and thermally connected to it
Implementation Method 2
a quantity correlating with a temperature-dependent decay time constant τ of the material of the fluorescent marking structures is determined and the temperature of the rotating part is determined via this
Data Source
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AI summary
The invention relates to a method for contactlessly sensing the temperature of a rotating part (10) of an electrical machine, which is rotatably mounted about an axis of rotation (12), by means of a marking comprising fluorescent marking structures (18) distributed around the rotating part (10) in a ring (20) around the axis of rotation (12) and thermally connected to the rotating part, a light source (22) for exciting the fluorescent marking structures (18) and at least one light sensor (24) for detecting fluorescent light that is emitted as a result of the excitation of the fluorescent marking structures, wherein from this detection process, a variable correlating with a temperature-dependent decay time constant τ of the material of the fluorescent marking structures is determined and the temperature of the rotating part (10) is determined using said variable. The invention also relates to a corresponding device (14) for contactlessly sensing the temperature of a rotating part (10) of an electrical machine.