期刊
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
卷 62, 期 2, 页码 415-423出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2012.2215141
关键词
Cores; extremely low frequency (ELF) measurement; inductor model; transmission lines; vector network analyzer (VNA)
资金
- Ministry of Innovation, Science and Enterprise (Andalusian Regional Government and Central Government) [FQM-32080, TEC2009-13763-C02-02]
- European Union FEDER Program, as part of the Electronics, Communications and Telemedicine, Research Group of the University of Almeria [TIC-019]
Characterization and modeling of high-value inductors (hundreds to thousands of henrys) are complex problems, exacerbated when working in the extremely low frequency (ELF) range. This paper details the measurement and characterization of inductors using a vector network analyzer that has a bottom operating frequency of 5 Hz. Using this device, we establish a strategy for measuring the impedance of high-inductance coils-with or without a high-permeability core-and propose a mathematical model that can explain the behavior of these high-inductance coils, which incorporate long lengths of winding wire, as a function of working frequency. These inductors were constructed as part of a research project on ELF electromagnetic fields. The importance of making a complete characterization derives from the need to exploit the largest possible amount of energy captured by the coil, which acts as a sensor. We propose a mixed model of concentrated and distributed parameters that fits the experimental results with an error of about 2% for the frequency range of 5-500 Hz, as part of the characterization process. The effects of the magnetic core on inductance and winding resistance, as a function of frequency, have been characterized in terms of concentration of the magnetic field.
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