Fiber Optic Stator Slot Temperature Sensing
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Solution Overview
Problem
Conventional temperature monitoring methods for stator slot temperatures in electromotive machines are unreliable and prone to failure due to high electromagnetic environments, limited to single-point measurements, and experience rapid degradation, making them unsuitable for accurate and cost-effective monitoring.
Innovation Solution
A fiber optic sensing apparatus using dielectric strips with embedded optical fibers and fiber gratings is deployed between stator bars, providing multi-point temperature sensing capabilities and 3D temperature mapping, which is more robust and accurate than traditional resistance temperature detectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional resistance temperature detectors are used for temperature monitoring, then single-point measurement capability is provided, but reliability deteriorates due to high electromagnetic environments and rapid degradation
Solution Approach 1:
The patent replaces conventional electrical resistance temperature detectors with fiber optic sensors that use optical instead of electrical signals. This substitution eliminates the vulnerability to electromagnetic interference and rapid degradation, thereby improving reliability while maintaining temperature measurement capability.
Solution Approach 2:
The patent introduces fiber optic cables as intermediary elements that transmit temperature measurement data from the stator slot environment to external monitoring systems. These optical intermediaries are immune to electromagnetic interference, resolving the reliability issue while preserving measurement precision.
2Device complexity
If conventional single-point temperature monitoring is used, then device complexity is minimized, but measurement precision deteriorates due to limited monitoring coverage
Solution Approach 1:
The patent divides the temperature monitoring function into multiple discrete fiber optic sensing points distributed throughout the stator slot. Each fiber can provide measurements at different locations, enabling comprehensive temperature distribution mapping while maintaining relatively simple system architecture.
Solution Approach 2:
The patent transitions from single-point (0D) or single-line (1D) temperature monitoring to multi-point spatial distribution monitoring (3D) by deploying fiber optic sensors at multiple locations within the stator slot, thereby achieving comprehensive temperature field characterization without proportionally increasing system complexity.
3Measurement precision
If fiber optic sensing apparatus with multiple fibers is deployed, then measurement precision improves through multi-point monitoring, but device complexity increases
Solution Approach 1:
The patent combines multiple fiber optic sensing elements into a single integrated sensing apparatus that can be installed together in the stator slot. This merging approach enables multi-point temperature monitoring with improved precision while managing device complexity through unified installation and configuration.
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 fiber optic sensing apparatus offers reliable, multi-point temperature monitoring, reducing downtime and maintenance costs by providing accurate temperature data across the stator slot, enhancing the operational reliability and design analysis of electromotive machines.
Implementation Method 1
sensing apparatus based on fiber optics including fiber gratings for monitoring stator slot temperatures
Data Source
AI summary
A sensing apparatus (20) based on fiber optics including fiber gratings for monitoring stator slot temperatures in an electromotive machine (10) is provided. The apparatus may include a dielectric strip (22) to be received in a gap between a first stator bar (16) and a second stator bar (18) in a stator slot (14). One or more optical fibers (24, 25) may be disposed in the dielectric strip and extend along a longitudinal axis of the dielectric strip. A plurality of sites 28 in the optical fiber include a respective fiber Bragg grating arranged to have a respective optical response in a wavelength spectrum indicative of a value of temperature at the grating site.