| Popis: |
Depending on the Si content, the magnetic and the electrical properties of steels for electrotechnical purpose are produced with oriented grains or contrarily with non-oriented grains. Usually, the Si content of such steels varies between 0.8 - 4.8%. Generally, steels with less than 3% Si are used for small and medium power electric machines, while steels with higher Si content, i.e. above 3%, are used for high power electric machines and electric transformers. Si in steel increases the strength and decreases the magnetic losses guaranteeing the development of large grains, which improves the magnetic properties of the laminated sheets. For the processing of the sheets, the magnetic core of the electric machine has to be considered in addition to the magnetic properties of the material and the energy losses, the evolution of the material’s microstructure in the cutting area, which may possibly need reconditioning operations. The aim of this study is oriented to the morphological, mechanical electrical and magnetic characterization of Si steel with non-oriented grains in order to be further employed as transformer cores. |
