Abstract: In this paper, ANSYS Maxwell and ANSYS Workbench software were used to simulate the performance of magnetic and mechanical properties of WISCO DW series non-oriented silicon steel. The electromagnetic simulation results showed that the high frequency core loss of  0.35  mm silicon steel sheet was  48.9 %  lower than  0.50  mm silicon steel, and the average efficiency of the motor could be improved by  0.8 % . It indicated that the use of thin gauge silicon steel could significantly reduce the core loss and improve the motor efficiency, while the silicon steel sheet with same thickness had little effect on the motor efficiency. The mechanical simulation results showed that the maximum stress of rotors with different thicknesses silicon steel concentrated on the magnetic bridge area of rotor and increased significantly with the speed. When the speed was greater than  12 000  r/min, the maximum stress was generally proportional to the speed by power  2.06 . At the same time, when the width of the magnetic bridge was less than  1.6  mm, the maximum stress value increased significantly with width gradually decreasing. To sum up, the use of thin gauge, high strength non oriented silicon steel can meet the development requirements of high efficiency and high speed of motors of new energy vehicle. This study can provide certain guidance for the research and development of non oriented silicon steel for new energy driving motor and the optimization design of motor structure.

Key words: non oriented silicon steel, simulation analysis, core loss, magnetic bridge width, high strength, high speed motor