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APPLICATION OF THE BARKHAUSEN EFFECT IN MECHATRONIC QUALITY CONTROL SYSTEMS OF ELECTRICAL STEEL

Residual magnetic anisotropy of isotropic electrical steel adversely affects the performance of electrical machines. Mechanical stresses and deformations arising during the manufacture of parts lead to an increase in the anisotropy of the magnetic properties. The aim of this work is to develop a method that makes it possible to assess the degree of residual magnetic anisotropy in finished products. For this, the paper considers the possibility of using the parameters of the Barkhausen effect (EB), reflecting the dynamics of the magnetic structure of the material in alternating magnetic fields. As samples for the study, a set of ready–made stamped plates of the core of a toothed rotor of an electric machine was used. The microstructure of the samples was investigated using a Neopfot–21 metallographic microscope. The studies of the magnetic structure were carried out using the original Barkhausen device for recording magnetic noise, which includes a magnetic noise sensor, a system of amplifying–converting units, and a digital processing unit for measuring information. The results of measurements of the area of the envelope around the circumference of the average diameter and along the teeth of the rotor plate are given, which make it possible to estimate the level of residual anisotropy of isotropic steel by scanning the surface of the tooth rotor plates with a magnetic noise sensor. The data obtained can serve as the basis for the development of a method for controlling the level of magnetic anisotropy of isotropic electrical steels induced in finished products as a result of mechanical processing.