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Investigation of electrical and magnetic properties of ferro-nanofluid on transformers.

Tsai TH, Chen PH, Lee DS, Yang CT - Nanoscale Res Lett (2011)

Bottom Line: The ferro-nanofluid was fabricated by a chemical co-precipitation method.The experimental results indicated that the inductance and coupling coefficient of coils grew with the increment of the ferro-nanofluid concentration.The presence of ferro-nanofluid increased resistance, yielding to the decrement of the quality factor, owing to the phase lag between the external magnetic field and the magnetization of the material.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical Engineering, National Taiwan University, No, 1, Sec, 4, Roosevelt Rd,, Taipei 10617, Taiwan. phchen@ntu.edu.tw.

ABSTRACT
This study investigated a simple model of transformers that have liquid magnetic cores with different concentrations of ferro-nanofluids. The simple model was built on a capillary by enamel-insulated wires and with ferro-nanofluid loaded in the capillary. The ferro-nanofluid was fabricated by a chemical co-precipitation method. The performances of the transformers with either air core or ferro-nanofluid at different concentrations of nanoparticles of 0.25, 0.5, 0.75, and 1 M were measured and simulated at frequencies ranging from 100 kHz to 100 MHz. The experimental results indicated that the inductance and coupling coefficient of coils grew with the increment of the ferro-nanofluid concentration. The presence of ferro-nanofluid increased resistance, yielding to the decrement of the quality factor, owing to the phase lag between the external magnetic field and the magnetization of the material.

No MeSH data available.


The resistances of coils of transformers with different magnetic cores.
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Figure 7: The resistances of coils of transformers with different magnetic cores.

Mentions: Figure 7 shows that the resistance increases with the increase of Fe3O4 concentration, and it increases as a function of frequency. At 100 MHz, the resistances with the magnetic core of 0.25 and 1 M Fe3O4 nanofluids were two and five times the resistance as the air core. It is speculated that this is because of the phase lag on the material magnetization behind the external magnetic field at high frequencies. When the relaxation times cannot keep up the alternate time of the magnetic field, the resistance of the coils will grow rapidly [10,22]. At high frequencies, the permeability should be regarded as a complex number. Rearranging complex permeability and the inductance of a solenoid-type inductor, the impedance equation is obtained as follows:(1)


Investigation of electrical and magnetic properties of ferro-nanofluid on transformers.

Tsai TH, Chen PH, Lee DS, Yang CT - Nanoscale Res Lett (2011)

The resistances of coils of transformers with different magnetic cores.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211327&req=5

Figure 7: The resistances of coils of transformers with different magnetic cores.
Mentions: Figure 7 shows that the resistance increases with the increase of Fe3O4 concentration, and it increases as a function of frequency. At 100 MHz, the resistances with the magnetic core of 0.25 and 1 M Fe3O4 nanofluids were two and five times the resistance as the air core. It is speculated that this is because of the phase lag on the material magnetization behind the external magnetic field at high frequencies. When the relaxation times cannot keep up the alternate time of the magnetic field, the resistance of the coils will grow rapidly [10,22]. At high frequencies, the permeability should be regarded as a complex number. Rearranging complex permeability and the inductance of a solenoid-type inductor, the impedance equation is obtained as follows:(1)

Bottom Line: The ferro-nanofluid was fabricated by a chemical co-precipitation method.The experimental results indicated that the inductance and coupling coefficient of coils grew with the increment of the ferro-nanofluid concentration.The presence of ferro-nanofluid increased resistance, yielding to the decrement of the quality factor, owing to the phase lag between the external magnetic field and the magnetization of the material.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical Engineering, National Taiwan University, No, 1, Sec, 4, Roosevelt Rd,, Taipei 10617, Taiwan. phchen@ntu.edu.tw.

ABSTRACT
This study investigated a simple model of transformers that have liquid magnetic cores with different concentrations of ferro-nanofluids. The simple model was built on a capillary by enamel-insulated wires and with ferro-nanofluid loaded in the capillary. The ferro-nanofluid was fabricated by a chemical co-precipitation method. The performances of the transformers with either air core or ferro-nanofluid at different concentrations of nanoparticles of 0.25, 0.5, 0.75, and 1 M were measured and simulated at frequencies ranging from 100 kHz to 100 MHz. The experimental results indicated that the inductance and coupling coefficient of coils grew with the increment of the ferro-nanofluid concentration. The presence of ferro-nanofluid increased resistance, yielding to the decrement of the quality factor, owing to the phase lag between the external magnetic field and the magnetization of the material.

No MeSH data available.