Mechanical Cutting Influence on the Energy Losses in Non Oriented Silicon Iron Steels

Mechanical cutting technology is a worldwide method, used to cut the magnetic cores of the electrical machines nowadays. The manufactures of the electrical devices prefer cutting the non oriented steel through this classical method, due to the fact that it is the cheapest of all. Non oriented silicon iron alloys (NO FeSi) are mainly characterized by specific energy losses. The mechanical properties and the coatings of the material become important, because they influence the power density and the cost of the resulting electric machine. There were tested strips of M800-65A industrial steel grade, cut through punching technology. All samples have the length equal to 300 mm and the width of 30, 15, 10, 7.5 and 5 mm. The magnetic characterization was performed using a laboratory single strip tester, which can make measurements on samples with an area of 300 x 30 mm(2). To have the standard width of 30 mm, there were put together side by side 2, 3, 4 and 6 pieces with different widths. The magnetic properties were analyzed at 1000 mT and 1500 mT in the frequency range 10 divided by 200 Hz.