Limits...
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 coupling coefficients of transformers with different magnetic cores: (a) measured data; (b) simulated data.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3211327&req=5

Figure 6: The coupling coefficients of transformers with different magnetic cores: (a) measured data; (b) simulated data.

Mentions: Figure 5 shows the inductances of the coils of the transformers with different magnetic cores. Figure 5 illustrates that the inductance grows linearly with the increase of Fe3O4 concentration. At frequencies ranging from 100 kHz to 15 MHz, the inductances decrease rapidly due to the skin effect of coils. At frequencies ranging from 15 to 100 MHz, the inductances increase gradually and approach the maximum inductance at the resonance frequency. Figure 6 shows the measured and simulated results of the coupling coefficients of the transformers with different magnetic cores. The coupling coefficients also increase with the increase of Fe3O4 concentration. It increases rapidly below frequencies of 5 MHz and increases gradually with frequencies over 5 MHz. These results show that the magnetic cores of nanofluids can improve the inductance and coupling coefficients.


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

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

The coupling coefficients of transformers with different magnetic cores: (a) measured data; (b) simulated data.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 6: The coupling coefficients of transformers with different magnetic cores: (a) measured data; (b) simulated data.
Mentions: Figure 5 shows the inductances of the coils of the transformers with different magnetic cores. Figure 5 illustrates that the inductance grows linearly with the increase of Fe3O4 concentration. At frequencies ranging from 100 kHz to 15 MHz, the inductances decrease rapidly due to the skin effect of coils. At frequencies ranging from 15 to 100 MHz, the inductances increase gradually and approach the maximum inductance at the resonance frequency. Figure 6 shows the measured and simulated results of the coupling coefficients of the transformers with different magnetic cores. The coupling coefficients also increase with the increase of Fe3O4 concentration. It increases rapidly below frequencies of 5 MHz and increases gradually with frequencies over 5 MHz. These results show that the magnetic cores of nanofluids can improve the inductance and coupling coefficients.

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.