Nanocrystalline cores have high saturation flux density, high permeability, low magnetic core loss, low magnetostriction, high temperature characteristics, and high frequency characteristics.Applications include noise filters, common mode chokes, pulse transformers, current sensors, magnetic shields, saturable reactors, and power transformers from 50 Hz up to 1Khz.Nanocrystalline cores can be classified as Common Mode Choke Cores (CMC), High Frequency Power Transformer Cores (HFPT) and Current Transformer Cores (CT) based on different uses and performances. Features: Compared with ferrite, nanocrystalline has higher Curie temperature, wide working temperature range and excellent thermal stability. It has higher magnetic permeability and higher saturation flux density, which can significantly reduce the volume and weight of cores. Therefore, it is more compatible with the development trend of miniaturization and lightweight of electronic products. Typical applications are as below: •  Common Mode Choke Cores (CMC Cores) Nanocrystalline common mode choke core has excellent frequency and impedance characteristics, which makes it the state-of-the-art material for a wide range of applications, e.g. power supply, electric drive and electric control systems for electric vehicles, photovoltaic power inverters, wind power converters, switching power supply for home appliances, as well as EMC solutions of industrial power supplies such as inverter welding machine. •  High Frequency Power Transformer Cores (HFPT Cores) Nanocrystalline Power transformer cores are widely used in various high-frequency industrial power supplies. For example, nanocrystalline toroidal cores are mainly used in inverter welding machine power supply, induction heating equipment power supply, communication power supply, UPS power supply, X-ray machine power supply, laser power supply, variable-frequency power supply, etc. As for nanocrystalline rectangular and C-shape cores, they are mainly used in electric locomotive traction/auxiliary power supplies, DC converters, electrostatic precipitating power supplies, etc. •  Current Transformer Cores (CT Cores) Nanocrystalline current transformer cores are mainly used in electric power transmission, electronic watt hour meters, and leakage protection switches, etc. Craftsmanship 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.