A Knowledge-Based Analysis of Interlaminar Faults for Condition Monitoring of Magnetic Cores With Predominant Focus on Axial Offset Between the Fault Points.

IEEE Trans. Instrum. Meas.(2024)

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Abstract
Condition monitoring and fault diagnosis of electromagnetic devices is a normal practice to prevent unpredicted downtime and catastrophic failure. In this sense, inter-laminar faults (ILFs) detection or fault diagnosis in the magnetic cores is a key objective. This paper aims to present advanced experimental measurements and numerical analysis to study influence of ILFs on soft magnetic properties of magnetic cores with Grain Oriented Electrical Steels (GOES). The predominant focus of these studies and associated analysis is ILFs with axial off-set between the short circuit points. To carry out the experimental measurements, stacks of four standard Epstein size strips of GOES were assembled. Each stack was subjected to minor ILF with axial off-set from 0 to 200 mm . The test samples were magnetised under controlled sinusoidal induction at a frequency of 50 Hz, and peak inductions of 1.1 T to 1.7 T. Impacts of each fault scenario on soft magnetic properties of the test samples was investigated by monitoring and interpreting the dynamic hysteresis loops (DHLs). In favour of supporting the practical measurements, accurate time-domain finite element (FE) models were also undertaken to reproduce the DHLs, and to visualise distribution of inter-laminar eddy currents and power loss caused by ILFs.
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