Custom Soft Magnetic Materials and Transformer Core Manufacturers in China

Characteristics of Nanocrystalline Materials

by:Transmart     2022-08-01

1. High magnetic induction: the saturation magnetic induction Bs=1.2T, which is twice that of permalloy and 2.5 times that of ferrite. The power density of the iron core is large, which can reach 15 kW to 20 kW/kg.​​

2. High permeability: The initial static permeability μ0 can be as high as 120,000 to 140,000, which is equivalent to permalloy. The magnetic permeability of the iron core of the power transformer is more than 10 times that of the ferrite, which greatly reduces the excitation power and improves the efficiency of the transformer.​​

3. Low loss: in the frequency range of 20kHz to 50kHz, it is 1/2 to 1/5 of ferrite, which reduces the temperature rise of the iron core.​​

4. High Curie temperature: the Curie temperature of nanocrystalline materials reaches 570℃, and the Curie temperature of ferrite is only 180℃~200℃.​​
Due to the above advantages, the transformer made of nanocrystals is used in the inverter power supply, which has played a great role in improving the reliability of the power supply:
1. The loss is small, the temperature rise of the transformer is low, and the long-term actual use of a large number of users has proved that the temperature rise of the nanocrystalline transformer is far lower than that of the IGBT tube.​​
2. The high magnetic permeability of the iron core reduces the excitation power, reduces the copper loss, and improves the efficiency of the transformer. The primary inductance of the transformer is large, which reduces the impact of the current on the IGBT tube during switching.​​
3. The working magnetic induction is high and the power density is high, which can reach 15Kw/kg. The volume of the iron core is reduced. Especially the high-power inverter power supply, the volume reduction increases the space in the chassis, which is beneficial to the heat dissipation of the IGBT tube.​​
4. The overload capacity of the transformer is strong. Since the working magnetic inductance is selected to be about 40% of the saturation magnetic inductance, when the overload occurs, only the increase of the magnetic inductance will generate heat, and the IGBT tube will not be damaged due to the saturation of the iron core. 5. The Curie temperature of nanocrystalline materials is high. Assuming that the temperature reaches above 100 °C, the ferrite transformer can no longer work, and the nanocrystalline transformer can work normally.​​
6. There are atomic nucleation points on the surface of the nanocrystalline aggregated sphere, which convert the fouling substances dissolved in water into tiny nanocrystals; 7. Once the crystals grow to a certain size on the surface of the nanocrystalline aggregated sphere, they are It will automatically fall off into the water, and the crystal will no longer produce scale.​​

These advantages of nanocrystalline have been recognized and adopted by more and more power supply manufacturers. A number of domestic manufacturers have adopted nanocrystalline iron cores and applied them for many years. More and more manufacturers are beginning to use or try it out. At present, it has been widely used in inverter welding machine, communication power supply, electroplating and electrolytic power supply, induction heating power supply, charging power supply and other fields, and there will be a greater increase in the next few years.
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