Abstract: With the high-speed development of drive motors for new energy vehicles, the core loss and its resultant increase in motor temperature have received widespread attention. Silicon steel material as the main material of the drive motor core, involved in electromagnetic energy transmission and conversion, while generating core loss. This is the main loss of motor equipment, which directly affects the efficiency of the motor, and with the development of high-speed motor, the core loss accounts for a larger proportion. Therefore, it is necessary to accurately analyze and calculate the core loss of silicon steel materials, through the test of the core loss of four kinds of silicon steel materials commonly used or with the potential of high-speed motor application of oriented silicon steel, non-oriented silicon steel, ultra-thin silicon steel and high-strength silicon steel, and analyzed the change rule of its core loss at different frequencies. Based on the loss separation model, the influence of magnetic field frequency on the hysteresis loss coefficient and eddy current loss coefficient of the iron loss model is analyzed, which provides a reference for the calculation of the core loss of silicon steel materials and the optimization of the loss model.

Key words: silicon steel material, core loss, hysteresis loss, eddy current loss