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Nanocrystalline Common Mode Inductor Core Application Principle and Example Content Sharing

by:Transmart     2022-12-23

1. Variable-frequency drive inverter (Variable-frequency Drive Device)

The frequency converter is a power control device that uses frequency conversion technology and microelectronics technology to control the AC motor by changing the frequency of the motor's working power supply. The inverter is mainly composed of rectification (AC to DC), filter, inverter (DC to AC), braking unit, drive unit, detection unit, micro-processing unit, etc. The frequency converter adjusts the voltage and frequency of the output power supply by switching off the internal IGBT, and provides the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation. With the continuous improvement of industrial automation, frequency conversion It has also been widely used. The low-permeability nanocrystalline large common-mode inductor core is suitable for low-voltage inverters of ≤1000V, and can effectively suppress the common-mode interference generated by the inverter.

2. Photovoltaic inverter (PV Inverter)

Suitable for 500kW, 1MW high-power centralized photovoltaic inverters. High magnetic permeability and large common mode inductor core is suitable for EMC filtering on the AC side of high-power photovoltaic inverters. Using the high inductance of the iron core can effectively reduce the number of iron cores to achieve a good filtering effect; low magnetic permeability large common mode inductor The iron core is suitable for EMC filtering on the DC side of high-power photovoltaic inverters. This type of iron core has good inductance frequency characteristics, can effectively resist unbalanced DC components, and avoid burning caused by iron core saturation.

3. Wind power converter

Suitable for 1MW, 1.5MW, 2MW, 3MW and other direct drive and double-fed converters. The single-turn choke coil assembled by stacking several nanocrystalline iron cores is an effective solution to the problem of bearing current, and it is also a large current interference (peak value from tens to more than 100 amperes) generated by wind power generation, large-scale variable speed drives and other applications. ) effective solution to the problem of ultra-high common-mode noise caused by These problems usually manifest themselves in the form of high frequency spike currents. The common mold components produced by Antai Technology Co., Ltd. can be easily and safely integrated into these existing fields to solve the problems that arise. Co-molded assemblies can be assembled from two magnetic rings with different inner diameters. Components are custom-designed according to the required saturation current and inductance, allowing a single selection of magnetic rings, or several assemblies (maximum 7).


Nanocrystalline common mode inductors are increasingly used in on-board chargers for pure electric vehicles and hybrid electric vehicles. When the temperature is as high as 180°C, the nanocrystalline iron core can run safely and for a long time; limited by its application temperature range ~100°C, the ferrite iron core cannot meet the use requirements.

5. Gas insulated switchgear

Gas insulated switchgear (GIS) is a very reliable component of power transmission networks. In the past few years, the system voltage reached 1.2 kV. The switching operation of the GIS can cause dangerous transient voltages (VFTO). Concentric installation of nanocrystalline iron cores on the inner conductors as single-turn reactors can effectively suppress these damaging high-frequency (~15 MHz) voltages. Other core materials such as ferrite cannot solve this problem.

6. High energy particle accelerator

Since nanocrystals have a high saturation flux density of at least 1.2 Tesla, a suitable nanocrystal iron core is a solution for synchrocyclotron cavity tuning components. For particle beam deflection clusters or compression clusters in very limited space, by using nanocrystalline cores, the required length can usually be reduced by 50% compared to ferrite cores, but the disadvantage is that the power consumption increases significantly during operation. However, due to their low impedance, nanocrystalline cores also avoid adverse interaction with ion beams, and as a result, nanocrystalline cores are used in several particle beam accelerator facilities around the world.
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