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Performance advantages and applications of nanocrystalline soft magnetic alloys

Nanocrystalline soft magnetic alloy is a new kind of soft magnetic alloy material. Due to its excellent soft magnetic properties, it is gradually replacing the traditional soft magnetic alloy. Today we come to talk about the performance advantages and application range of nanocrystalline soft magnetic alloy.
The nanocrystalline soft magnetic alloy refers to a soft magnetic alloy having a nanocrystalline structure obtained by heat treatment on the basis of an amorphous alloy, and has more excellent soft magnetic properties. Therefore, the manufacturing process and use process of amorphous alloy materials will be energy-saving, and green energy-saving products will be developed in the new century.
Since the United States took the lead in the development of practical amorphous alloy strips, amorphous alloys are gradually replacing traditional soft magnetic materials such as silicon steel, Permalloy, and ferrite due to the efficient preparation process and excellent material properties in electric power and electronics. , communications and other fields have gained more and more applications. In the past decade, traditional soft magnetic materials have been unable to meet the requirements of high-frequency, small-scale and lightweight development of electronic and communication technologies. High-quality amorphous and nanocrystalline alloy ribbons have outstanding advantages compared with their counterparts. Therefore, they have become The important basic functional materials play an important role in promoting the development of high and new technologies and are key materials in the information, biology, energy, environmental protection, space, and high-tech fields in the 21st century.
(1) Widely used in power electronic systems
In the field of power electronics, with the maturation of high-frequency inverter technology, traditional high-power linear power supplies have been largely replaced by high-frequency switching power supplies, and in order to increase efficiency and reduce the volume, the operating frequency of switching power supplies has become higher and higher. On the soft magnetic material put forward higher requirements. Silicon steel high-frequency loss is too large, can not meet the requirements for use; ferrite although high-frequency losses are low, but there are still many problems in high-power conditions, one is low saturation magnetic induction, can not reduce the size of the transformer; second is The Curie temperature is low, and the thermal stability is poor. Third, the production of large-size iron cores has a low yield and high cost. A single transformer with power ferrite does not have a conversion power of more than 20 kW. Nanocrystalline soft magnetic alloy has high saturation magnetic induction and low high-frequency loss at the same time, and has good thermal stability. It is the best choice for soft magnetic materials used in high-power switching power supplies. Transformers with nanocrystalline iron cores can achieve a conversion power of 500 kW and a volume reduction of more than 50% compared to power ferrite transformers. Nanocrystalline alloys have been widely used in inverter welding power supplies, and their application in switching power supplies in areas such as communications, electric vehicles, and electroplating is also actively under development. At present, about 6% of domestic ordinary nanocrystalline strips are used in inverter welding machines.
(2) Widely used in high-frequency electronic information
The nanocrystalline thin strip is mainly used in the high-frequency electronic information field, and its application focuses on various high-quality core materials used in switching power supplies and electromagnetic interference (EMI) filters. Compared with traditional iron cores (such as ferrite cores), nanocrystalline iron cores have become a preferred product because of their high magnetic induction, low loss, and stable performance.
(3) The future will be more applied to new energy
The main application direction of nanocrystalline thin strips is the emerging application fields of emerging industries such as new energy (solar energy, wind power) and electric vehicles. In emerging applications, nanocrystalline thin strips are mainly used as common-mode inductors for high-voltage transformers, solar photovoltaic inverters, electric vehicle-mounted chargers, and high-frequency transformer core materials. With the global energy situation being tense and climate warming seriously threatening economic development and people's health, today, countries around the world are seeking new energy alternative strategies to achieve sustainable development and gain an advantage in the future development. As a clean and renewable new energy industry, solar photovoltaic power generation has received widespread attention and attention from all countries in the world. Many governments are increasing their support for the industry's policies and taking solar photovoltaic and other new energy industries as an important measure to lead the economic development. The grid-connected photovoltaic inverter is the core power adjustment device of the photovoltaic system in order to realize the integration of photovoltaic power generation into the grid and the load. The main electromagnetic components in the grid-connected PV inverter configuration include output filter inductors, common-mode inductors and isolation transformers. Among them, the main function of the output filter inductor is to convert the PWM modulating wave into a sine wave with little distortion, so as to realize the function of feeding a clean sine wave to the grid or the load. The common-mode inductor made of nanocrystalline thin strips and high-frequency transformer cores are characterized by 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.

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