Effects of Temperature on Inductance of Ferrite Toroidal Inductors During Operating Frequencies of 20 Hz–2 MHz

Main Article Content

ศุภวิทย์ บัวบุญ
ชลธี โพธิ์ทอง


Ferrite toroidal inductors are commonly used in electronic circuits due to their simple structure and low electromagnetic interference. However, the ferrite core and copper coils, the main materials of the inductors, are sensitive to ambient temperature. This would effect to inductance of the inductors. This paper presents effects of ambient temperature in the range of 25-100 oC on inductance of ferrite toroidal inductors during electronics operation frequencies (20Hz-2MHz). The experiment results showed that inductance of the inductors increased when ambient temperature increases; especially at high frequencies. The inductors with small size of copper wires had high variation of inductance compared with the larger size, while the inductors with less number of turns of coils had high variation of inductance.

Article Details

บทความวิจัย (Research Article)


[1] Kronsbein J, Schoessow GJ. The magnetic field of a knotted toroidal inductor. Proceedings of the IEEE. 1967; 55(1): 108–109.
[2] Tacca HE. Ferrite Toroidal Inductor Design. IEEE Latin America Transactions. 2009; 7(6). 630–635.
[3] Goldman A. Modern Ferrite Technology. Boston: Springer US; 2006.
[4] Mukherjee P, Goswami S. Ferrite Material for Energy-Meter Current Transformer -T36. India: Epcos; 2006.
[5] Reddy MP, et al. Characterization and Electromagnetic Studies on NiZn and NiCuZn Ferrites Prepared by Microwave Sintering Technique. Materials Sciences and Applications. 2012; 3(9): 628–632.
[6] Leiste H. High frequency permeability with real and imaginary (damping) part using a coplanar measuring head in a frequency range of 30 kHz < f < 6 GHz, Germany: Karlsruhe Institute of

Technology; 2018.
[7] Dorsey P, Vittoria C, Wittenauer M. Novel technique for ferrimagnetic resonance measurement. In: Digests of Intermag. International Magnetics Conference; 1992.
[8] Rudnev V, Loveless D, Cook R, Black M. Handbook of Induction Heating. New York: Marcel Dekker; 2003.
[9] Bockarjova M, Andersson G. Transmission line conductor temperature impact on state estimation accuracy. Power Tech. 2007.
[10] Hubbi W, Wang Y, Zhang W. Effects of inductance variations due to temperature on load-flow results. In: North American Power Symposium (NAPS). Manhattan: KS; 2013. p. 1–4.
[11] Saleem MJ, Bertilsson K. EMI filter design for high frequency power converters. In: 11th International Conference on Environment and Electrical Engineering. Venice; 2012. p. 586–589.
[12] TDK. Mn-Zn Ferrite Material Characteristics. 2019.
[13] สำนักงานมาตรฐานผลิตภัณฑ์อุตสาหกรรม. มอก.82-2551. กระทรวงอุตสาหกรรม; 2552.
[14] Keysight Technologies. E4980A Precision LCR Meter 20 Hz to 2 MHz E4980AL Precision LCR Meter 20 Hz to 300 kHz/500 kHz/1 MHz Datasheet. USA; 2018.