Nanocrystalline soft magnetic alloy

Power electronic system applications

In the field of power electronics, with the maturity of high-frequency inverter technology, traditional high-power linear power supplies have begun to be replaced by high-frequency switching power supplies in Efficiency, volume reduction, and higher and higher operating frequency of switching power supply, which put forward higher requirements for the soft magnetic materials. The high frequency loss of silicon steel is too large to meet the requirements of use; although the high frequency loss of ferrite is low, there are still many problems under high power conditions. One is the low saturation magnetic inductance, which cannot reduce the volume of the transformer; The Curie temperature is low and the thermal stability is poor; the third is the low yield and high cost of making large-size iron cores. The conversion power of a single transformer using power ferrite does not exceed 20kW. Nanocrystalline soft magnetic alloy has both high saturation magnetic induction and low high frequency loss, and good thermal stability. It is the best choice for soft magnetic materials for high-power switching power supplies. The conversion power of transformers using nanocrystalline iron cores can reach 500kW, and the volume is reduced by more than 50% compared with power ferrite transformers. Nanocrystalline alloys have been widely used in inverter welding machine power supplies, and applications in switching power supplies in communications, electric vehicles, electrolytic plating and other fields are also being actively developed. About 6% of domestic ordinary nanocrystalline strips are used in the field of inverter welding machines.

Application in the field of high-frequency electronic information

Nanocrystalline thin strips are mainly used in the field of high-frequency electronic information. Class high-quality core material. Compared with traditional iron cores (such as ferrite iron cores), nanocrystalline iron cores have high magnetic induction, low loss and stable performance, and have become the preferred product.

Application in the field of new energy

The main application direction of nanocrystalline thin ribbon in the future is the emergence of new applications such as new energy (solar energy, wind energy), electric vehicles and other emerging industries. In emerging applications, nanocrystalline ribbons are mainly used as common mode inductors for solar photovoltaic inverters, electric vehicle on-board chargers, and high-frequency transformer core materials, and the market has increased tremendously. Today, when the global energy situation is tense and climate warming is seriously threatening economic development and people’s health of life, countries all over the world are seeking new energy alternative strategies in order to achieve sustainable development and gain an advantageous position in future development. As a clean and renewable new energy industry, solar photovoltaic power generation has received widespread attention and attention from countries all over the world. Many governments are increasing their policy support for the industry, taking solar photovoltaics and other new energy industries as important measures to lead economic development. Grid-connected photovoltaic inverter is the core power regulation device of photovoltaic system to realize photovoltaic power generation access to the grid and load. The main electromagnetic components in the grid-connected photovoltaic inverter structure are output filter inductance, common mode inductance and isolation transformer. Among them, the main function of the output filter inductor is to convert the PWM modulation wave into a sine wave with little distortion, so as to realize the function of feeding a clean sine wave to the grid or load. Common-mode inductors and high-frequency transformer cores made of nanocrystalline thin strips have the characteristics of small size, light weight, and energy saving.

In addition, with the full deployment of smart grids, smart meters will gradually replace traditional mechanical meters. Precision current transformers are key components in smart meters. With the construction of smart grids, nanocrystalline shear bands will also usher in new growth demands.

Development status

Since the United States took the lead in developing practical amorphous alloy strips, due to the efficient preparation process and excellent material properties, amorphous alloys are gradually replacing silicon steel, glass Traditional soft magnetic materials such as Mo alloys and ferrites are being used more and more in the fields of electric power, electronics, and communications. In the past ten years, traditional soft magnetic materials have been difficult to meet the requirements of electronic and communication technologies for high-frequency, small-scale and lightweight development. High-quality amorphous and nanocrystalline alloy ribbons have outstanding advantages compared with them. Therefore, they have become It is an important basic functional material, which plays an important role in promoting and supporting the development of high and new technology. It is a key material in the 21st century in the fields of information, biology, energy, environmental protection, space and high technology.

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