Characteristics of Nanocrystalline Materials

1. High magnetic induction: The saturation magnetic induction (Bs) of nanocrystalline materialscan reach 1.2T, which is about twice that of Permalloy and 2.5 times that of ferrite. This makes the power density of the core extremely high, reaching 15 kW to 20 kW/kg, significantly improving the performance of the transformer.

2. High magnetic permeability: The static initial magnetic permeability (μ0) of nanocrystalline materials can be as high as 120,000 to 140,000, which is comparable to Permalloy. The magnetic permeability used in power Transformer Cores is more than ten times that of ferrite, which greatly reduces the excitation power and thus improves the overall efficiency of the transformer.

3. Low loss: In the frequency range of 20kHz to 50kHz, the loss of nanocrystalline materials is only 1/2 to 1/5 of that of ferrite, which effectively reduces the temperature rise of the core and improves the stability and reliability of the equipment.

4. High Curie temperature: The Curie temperature of nanocrystalline materials can reach 570°C, while the Curie temperature of ferrite is only 180°C to 200°C. This allows nanocrystalline materials to maintain good performance in high temperature environments.

Due to the above advantages, the application of transformers made of nanocrystalline materials in inverter power supplies significantly improves the reliability of power supply:

1. Low loss and low temperature rise: The temperature rise of nanocrystalline transformers is much lower than that of IGBT tubes. After long-term actual use verification by a large number of users, its superiority in high efficiency has been proved.

2. High magnetic permeability: The high magnetic permeability of nanocrystalline materials reduces the excitation power and copper loss, thereby improving the efficiency of the transformer. At the same time, the primary inductance of the transformer is larger, which reduces the impact of current on the IGBT tube during switching and extends its service life.

3. High working magnetic induction and power density: The working magnetic induction of nanocrystalline materials is high, and the power density can reach 15 kW/kg, which significantly reduces the volume of the core. Especially in high-power inverter power supplies, the reduction in volume provides convenience for increasing the space in the chassis, which is beneficial to the heat dissipation of IGBT tubes.

4. Strong overload capacity: The working magnetic induction of the nanocrystalline transformer is selected to be around 40% of the saturation magnetic induction, which means that when an overload occurs, the heat generated only by the increase in magnetic induction will not cause the core to saturate, thereby protecting the IGBT tube from damage.

5. Advantages of high Curie temperature: When the temperature reaches above 100℃, the ferrite transformer may not work properly, while the nanocrystalline transformer can still maintain stable operation, showing its superior high temperature performance.

6. Scale prevention function: There are atomic-level crystal nuclei on the surface of the nanocrystalline aggregate sphere, which can convert the scaling substances dissolved in the water into tiny nanocrystals.

7. Self-cleaning mechanism: Once these crystals grow to a certain size on the surface of the nanocrystalline aggregate spheres, they will automatically fall off into the water, effectively preventing the formation of scale.

As these advantages of nanocrystalline materials are recognized and adopted by more and more power supply manufacturers, many domestic manufacturers have begun to use nanocrystalline cores and have achieved good results in practical applications. More and more manufacturers are using or trying this material. At present, nanocrystalline materials have been widely used in inverter welding machines, communication power supplies, electroplating and electrolytic power supplies, induction heating power supplies, charging power supplies and other fields, and are expected to grow more significantly in the next few years.