Simulating the change of magnetic hysteresis due to the cut of nonoriented electrical steel sheet

Electrical steels have become a highly important material for electrical industry. Both directions of energy conversion, either mechanical energy to electrical and electrical energy to mechanical use electrical steel sheet as a major component. Generating plants need powerful cores on one hand for generators, converting the energy from a turbine, on the other hand for transformators, increasing or decreasing the voltage in order to transmit electrical energy with low losses. Now having a component so crucial for the transmision of energy means that one is keen on reducing the energy being lost due to its properties in any way as much as possible. Electrical steel sheets are produced usually by cold rolling of bulk metal. The resulting sheets are then punched to the desired form. Finally the sheets are stacked in order to form a core for coils enhancing the magnetic eld produced by the latter. Each one of the production steps just mentioned inuences the mechanical properties: The metal is largely deformed and so is the crystal latice on a microscopic scale. These deformations are accompanied by great stress both compressive and tensile. It is well known that deformations, expressed in terms of a dimensionless strain, and stress, usually described in MPa units, in uence the amount of energy being lost in the transmission process. Experimentally these e ects are well investigated. Publications exist about the impact of deformations on the power losses of electrical steel sheet. However, publications, linking mechanical simulation of the process directly to magnetic properties in a predictive way are scarce. This work tries to nd this connection between the cutting process and magnetic properties of nonoriented electrical steel sheet once a simulation has been carried out.