• TITLE: MODEL-BASED STUDY OF LOSSES IN CYLINDRICAL SHAPED INDUCTORS
• AUTHOR(S): D. Grozdanov, N. Hinov, K. Tarnev
• ABSTRACT: Induction heating is a technology known for its highly efficient method of transferring energy from the source to the operated part or area. Inductors performing the conversion of high-frequency electrical energy into electromagnetic field are a major part of this technology. Determining their basic parameters, such as inductance and loss of power at a selected operating frequency, is key in the assessment and design of induction heating processes and systems. The calorimetric method for estimating lost power in the inductor is one of the most accurate. This article explores a variation of this method, which allows the real losses of a real inductor to be evaluated in the laboratory by relatively small power sources. The follow-up experiment is compared to the results achieved by simulating the environment through computer modeling. The main objective of the present study is to achieve the correlation between theoretical modeling and experimental data in order to derive a more general method for estimating the actual loss of power in a given inductor. This would facilitate the design of processes and systems in terms of power requirements by allowing a realistic assessment of the otherwise relatively complex interactions in the inductor between the electric current and the electromagnetic field. The advantages of such an approach are especially striking when working at high frequencies - at the order of 300 kHz, as phenomena such as a skin effect and proximity effect have a significant influence on the resulting electric current, its distribution across the cross section of the conductor, changing its effective cross section.
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