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Application Principle And Example Content Of Nanocrystalline Common Mode Inductor Core

Application Principle And Example Content Of Nanocrystalline Common Mode Inductor Core

2021-09-09

1. Variable frequency drive device


Frequency converter is a power control equipment that uses frequency conversion technology and microelectronics technology to control AC motor by changing the working power frequency of motor. The frequency converter is mainly composed of rectifier (AC to DC), filter, inverter (DC to AC), braking unit, driving unit, detection unit, microprocessor 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, so as to achieve the purpose of energy saving and speed regulation. With the continuous improvement of industrial automation, the frequency converter has also been widely used. Low permeability nanocrystalline large common mode inductance iron core is suitable for low-voltage frequency converter ≤ 1000V, which can effectively suppress the common mode interference generated by the frequency converter.

nanocrystalline core for common mode core

2. PV Inverter


It is applicable to 500kW and 1MW high-power centralized photovoltaic inverter. The iron core with high permeability and large common mode inductance is suitable for EMC filtering at the AC side of high-power photovoltaic inverter. Using the high inductance of the nanocrystalline core can effectively reduce the number of nanocrystalline cores and achieve good filtering effect; High common mode inductance iron core with low permeability is suitable for EMC filtering on DC side of high-power photovoltaic inverter. This kind of iron core has good inductance frequency characteristics, can effectively resist unbalanced DC component and avoid burning caused by iron core saturation.

Nanocrystalline core for high-power transformers

3. Wind power converter


Applicable to 1MW, 1.5MW, 2MW, 3MW direct drive and doubly fed converters. The single turn choke assembled by stacking several nanocrystalline cores is not only an effective solution to the problem of bearing current, but also an effective solution to the problem of ultra-high common mode noise caused by high current interference (peak value from tens to more than 100 amps) generated by wind power generation, large-scale variable speed drive and other applications. These problems usually take the form of high-frequency peak current. The common mode components produced by Aetna Technology Co., Ltd. can be easily and safely integrated into these existing fields to solve the problems. The common mode assembly can be assembled by two magnetic rings with different inner diameters. The components are customized according to the required saturation current and inductance, allowing single selection of magnetic rings or several assembly (up to 7).


4. Electric vehicle / hybrid vehicle


Nanocrystalline common mode inductors are increasingly used in vehicle chargers of pure electric vehicles and hybrid electric vehicles. When the temperature is up to 180 ℃, the nanocrystalline iron core can operate safely and for a long time; Limited by its application temperature range of ~ 100 ℃, ferrite iron core can not meet the use requirements.


5. Gas insulated switchgear


Gas insulated switchgear (GIS) is a very reliable component of power transmission network. In the past few years, the system voltage has reached 1.2KV. Switching operation of GIS may cause dangerous transient voltage (VFTO). Concentric installation of nanocrystalline iron core on the internal conductor as a single turn reactor can effectively suppress these destructive high-frequency (~ 15 MHz) voltages. Other core materials such as ferrite can not solve this problem.


6. High energy particle accelerator


Since nanocrystals have a high saturation flux density of at least 1.2 Tesla, an appropriate nanocrystalline core is the solution for the cavity tuning component of synchrocyclotron. By using nanocrystalline iron core, the required length of particle beam deflection concentrator or compression concentrator in a very limited space can usually be reduced by 50% compared with ferrite iron core, 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. Therefore, nanocrystalline cores are used in several particle beam accelerator facilities around the world.


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