Investigation of electrical and magnetic properties of ferro-nanofluid on transformers
1 Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan
2 Department of Energy and Refrigerating Air-conditioning Engineering, National Taipei University of Technology, No. 1, Sec. 3, Chung-hsiao E. Rd., Taipei 10608, Taiwan
3 Department of Mechanical and Computer-Aided Engineering, St. John's University, No. 499, Sec. 4, Tam-king Rd., Tamsui, Taipei 25135, Taiwan
Nanoscale Research Letters 2011, 6:264 doi:10.1186/1556-276X-6-264Published: 28 March 2011
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.