An Enhanced Analysis of Inter-Laminar Faults in Magnetic Cores With Grain Oriented Electrical Steels for Fault Diagnosis and Condition Monitoring: Theoretical Background and Experimental Verification

Fault diagnosis and condition monitoring of electromagnetic devices are the strategies for monitoring and processing parameters of the device for fault identification and failure prediction. In this respect, core faults or inter-laminar faults (ILFs) are a key objective, with an important contribution to the whole process. This article tends to propose a new experimental-analytical approach to fault diagnosis and condition monitoring of magnetic cores. The proposed technique is in line with the phenomenology of magnetic hysteresis and interpreting the dynamic characteristics of the magnetic cores. The distinct feature of this approach is its ability to model additional magnetic fields and associated energy loss caused by ILFs. The studies were carried out on stacks of standard Epstein size strips of 3 wt% SiFe grain oriented (GO) steels, subjected to artificial faults. Validation of the developed approach was undertaken through experimental work and analytical modeling.