With the development of automobile industry towards new energy and intelligence, compared with the traditional mechanical driving mode, electric drive has become the main driving mode of new energy vehicles. Therefore, the challenge of the development of new energy vehicles lies in the “three electric systems”, namely battery, electric drive and electronic control. In the three electric systems, a large number of magnetic materials and devices are involved, for example, the monitoring, measurement and protection of batteries in the battery management system, and the magnetic materials directly affect the monitoring and measurement accuracy; in the electric drive system, the performance of magnetic materials directly determines the performance and efficiency of new energy vehicles; the electronic control system involves filtering, energy storage, voltage transformation, measurement, etc. The dynamic performance of magnetic materials is very important for the functional requirements of magnetic materials and devices.
The development of new energy vehicles puts forward higher requirements and challenges for magnetic materials and devices, and also provides opportunities for the development of magnetic materials and devices. The difference of new energy vehicles lies in the competition of power utilization efficiency. In order to improve the conversion and utilization efficiency of electric energy, on the one hand, it is necessary to improve the performance of the motor to achieve high energy density, high frequency and low loss. The material requirements are high saturation magnetic induction and low loss at high frequency. On the other hand, high frequency technology is used to achieve the design goal of high efficiency and miniaturization. In the circuit, the main function of magnetic devices is to achieve filtering, energy storage, voltage transformation, measurement and anti-interference functions. The requirements of magnetic materials are good broadband characteristics to meet the requirements of high and low frequency electric drive; low loss to extend the range; high Curie temperature to improve the temperature Degree stability; common mode high impedance characteristics to meet the demanding requirements of high frequency intelligent EMC.
Amorphous and nanocrystalline alloys are the most ideal soft magnetic materials for electric vehicles
Due to their special structure and excellent comprehensive soft magnetic properties, amorphous and nanocrystalline materials are mainly used to manufacture various medium and high frequency transformers, high-performance inductors and filters, high-precision electromagnetic measurement and sensors, and high-performance electromagnetic shielding and absorbing materials. A large number of magnetic devices are used in electric drive system, electronic control system and charging system of electric vehicles. Amorphous and nanocrystalline alloys are the most ideal soft magnetic materials at present. These soft magnetic materials can provide high-frequency filter inductors, reactors, PFC and other products of electronic control unit for new energy vehicles, and provide EMC overall solutions for charging system. The energy-saving and efficient amorphous motor made of amorphous materials is especially suitable for the use of new energy vehicles, with outstanding advantages such as small current start-up, high-speed torque non attenuation and high-speed energy-saving.
In addition, amorphous and nanocrystalline are widely used in power transmission and distribution, electric power, industrial power, new energy, consumer electronics, aerospace, rail transit and other fields.
The development trend is to manufacture ultra wide and ultra thick amorphous ribbons and ultra wide ultra-thin nanocrystalline ribbons
The amorphous and nanocrystalline alloys adopt advanced rapid solidification technology. The thin strip with thickness of 20-30 μ m is made from molten steel in one step, which represents the shortest process of metallurgical process. As amorphous and nanocrystalline alloys have unique organizational structure, efficient preparation process and excellent material properties, which fully reflect the characteristics of energy saving in manufacturing and using process, so they have wide application in power industry, power electronics industry, electronic information industry, photovoltaic, wind power and electric vehicle and other strategic emerging industries.
The development trend of high-end applications and emerging fields of high-efficiency, energy-saving and miniaturization puts forward higher requirements for amorphous and nanocrystalline materials and devices. In order to meet these requirements and future development, the development trend of amorphous and nanocrystalline basic materials is to manufacture ultra wide and ultra-thin amorphous ribbons and ultra-wide ultra-thin nanoribbons respectively. The development trend of the properties of amorphous and nanocrystalline materials is further It can improve the saturation magnetic induction, reduce the material loss, realize the high performance of the material, the high efficiency of the use and the low emission of the production process.