Abstract
This paper investigates the key design and operational features of embedded fiber Bragg grating (FBG) sensing for thermal hot spot monitoring in random wound coils, such as used in low voltage electrical machines. To this end thermal experiments are performed on test wound coils embedded with FBG sensors to examine the vital application features of embedded sensor design, such as the sensor packaging material choice, in-situ calibration, sensitivity to vibration, and thermal response time. Measurement error rates are examined and quantified in representative practical tests. The reported results enable a much improved understanding of the performance implications of embedded FBG sensor design features and the attainable in-situ hot spot thermal monitoring performance in random wound coils.
Highlights
E LECTRIC machines have found many uses in modern industrial systems
This paper investigated the design and operational features of fiber Bragg grating (FBG) sensor use for thermal hot spot monitoring in random wound coils such as used in low voltage electric machinery
The reported data show that the use of sensor thermal calibration characteristic obtained prior to coil embedment to interpret in-situ hot spot measurements yields a measurement error that has been experimentally quantified and shown to be smaller than ≈1 °C. This error rate is deemed acceptable for electrical machine coil thermal monitoring in most practical applications [17], [19]
Summary
E LECTRIC machines have found many uses in modern industrial systems. A significant proportion are employed in low voltage applications for which they are almost invariably designed with random wound electric coils due to the benefit of reduced manufacturing cost [1]. Where thermal monitoring of wound components is concerned, the reported literature is constrained to metallic packaged FBG sensor application in large form wound coil structures or on the outer surface of random wound coils and not in the proximity of coil embedded hot spots that are of critical interest in low voltage machinery. MOHAMMED AND DJUROVIC : FBG THERMAL SENSING FEATURES FOR HOT SPOT MONITORING capability in a wound coil embedded position an FBG sensor needs to be isolated from mechanical stress inherent to machine coils. The underlying aim of this work is to increase the understanding of the influence of embedded sensor design features on attainable in-situ hot spot thermal monitoring performance, with a view to underpinning the acceptance and effective application of this technique in operational device embedded sensing applications
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
