The Influence of Excitation Flux Level and Frequency on the ELCID Detection Results

The stator core is composed of silicon steel sheets stacked together, with insulation protection between each layer. However, due to various factors such as vibration, heat generation, and electromagnetic force, the insulation layer between the silicon steel sheets may be damaged. Under the long-term action of alternating magnetic fields, fault current may be generated, which can cause overheating at the faulty location, exacerbating the severity of the fault. Therefore, the detection of insulation defects in the stator core is of great importance. The electromagnetic core imperfection detector (ELCID) method has received increasing attention due to its numerous advantages, but it has not been studied for excitation flux levels less than 4% and different excitation frequencies. Based on the relevant theoretical analysis, this paper uses the Ansoft Maxwell software to establish a finite element simulation model. By changing the magnetic permeability of the stator core and the excitation frequency, the influence on the ELCID method detection is explored. Corresponding experiments are carried out on the prototype to verify the results, and finally, a summary and analysis are provided. The relevant conclusions can provide reference for the further research of the ELCID method.