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Experimental Characterization of Localized Flux Density and Spatial Distortion in Magnetic Cores With NOES: A New Diagnostic Indicator for Interlaminar Faults
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DOI：10.1109/tim.2026.3718584.png)
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Abstract
En 中文
Standard maintenance of electromagnetic devices involves early stage fault diagnosis to prevent unplanned downtime and catastrophic failure. A critical component of this practice is the detection of interlaminar faults (ILFs), making magnetic core assessment a key diagnostic goal. This article proposes a novel experimental framework to further understanding of the impacts of ILFs on magnetizing processes and localized flux density distribution in magnetic cores. Core experimental work was undertaken on a stack of standard Epstein-size laminations with nonoriented electrical steels (NOESs), subjected to calibrated artificial ILFs at magnetizing frequencies from 50 to 400 Hz and overall flux densities from 1.1 to 1.7 T. The experimental results showed that ILFs make a significant impact on the configuration and dynamic magnetic behavior of the defected zone. A new diagnostic merit was introduced, correlating additional power loss caused by ILF with local flux distortion to provide a high-sensitivity indicator of fault severity. This research significantly enhances the physical understanding of ILF mechanisms, offering a quantitative foundation for developing advanced condition monitoring techniques and more resilient magnetic core designs for high-speed electrical machines.
Keywords:
Condition monitoring
core faults
localized flux density
nonoriented electrical steels (NOESs)
search coil (SC)
skin effect
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5.9
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1.9W
Citations:
5.8W
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