As the frequency of magnetic flux change in the stator core is proportional to the speed of the motor, as the motor speed increases, the frequency of magnetic flux alternating in the stator core increases. Compared with power frequency motors, high-speed motors have a larger proportion of core losses in the total motor losses. Therefore, reducing losses has become the main problem that needs to be solved in the design of high-speed motor  cores.(1) At the same frequency and magnetic density, the losses of amorphous stator core is less than 10% of that of silicon steel stator core, while the losses of nanocrystalline stator core is only about 3% of that of silicon steel stator core. Compared with silicon steel stator cores, amorphous and nanocrystalline stator cores can significantly reduce the losses of cores when used in high-speed motors. The low losses advantage of nanocrystalline stator cores is more obvious and their magnetic permeability is high. However, their operating saturation magnetic density is relatively low, making them suitable for applications with higher operating frequencies and higher requirements for motor efficiency.(2) When the working frequency is below 400Hz, the noise of silicon steel stator core is the lowest, and the noise of amorphous stator core is the highest; When the operating frequency is above 400Hz, the noise of the amorphous stator core is the highest, and the noise of the nanocrystalline stator core is the lowest.Nanocrystalline alloys are formed by adding a certain amount of glass forming agent to the molten metal, and rapidly quenching and casting using a narrow ceramic nozzle under high temperature melting conditions. Amorphous alloys have the similar characteristics of glass structure, which not only make them have excellent mechanical properties, physical properties and chemical properties, but more importantly, the new technology of producing amorphous alloys using this rapid quenching method is less than the cold-rolled silicon steel sheet process. 6 to 8 processes can save energy consumption by 60% to 80%, which is an energy-saving, time-saving and efficient metallurgical method. Moreover, the amorphous alloy has low coercivity and high magnetic permeability, and its core loss is significantly lower than that of oriented cold-rolled silicon steel sheet, and its no-load loss can be reduced by about 75%. Therefore, the use of amorphous alloys instead of silicon steel sheets to manufacture transformer cores is one of the main means to save energy and reduce consumption in today’s powergrid equipment.