Analysis of material properties metal sheets for the construction of induction motor

The paper deals with the material properties of metal sheets, which are used for construction of electric rotating machines, especially induction machines. A total of four samples of M330-50A sheets from two different manufacturers were selected. Two samples of sheets were cutting in the longitudinal direction of rolling and two samples of sheets cutting in the transverse direction. This combination of metal sheets was use for the study. The samples were metallographically prepared by sanding, polishing and etching. Metallographic sections were observed on an optical microscope. The approximate chemical composition of each sample was determined by scanning electron microscope (SEM). The electromagnetic behavior of samples, were determined with using measurement of BH characteristics by Epstein frame. Measurement of BH characteristics for both manufacturers was performed in the accordance with relevant standards (CEI IEC 404-2). The results of the investigation were further evaluated and compared. In the last part there is an enumeration of the possibility of influencing electrical properties in dependence on material composition of electrical steels and evaluation of own investigation.