REGULATION OF INDUCTION HEATING PROCESS USING NON-SINUSOIDAL CURRENT
Journal Title: Електромеханічні і енергозберігаючі системи - Year 2017, Vol 4, Issue 40
Abstract
Purpose. The purpose of the paper is to investigate electromagnetic processes that occur in an induction installation when operate under non-sinusoidal current, describe advantages of using such a current when heating machine parts. Methodology. We have decomposed the periodic non-sinusoidal current into its Fourier components, considering how each harmonic influence on the heating process. The dependence between inductor resistance and harmonic frequency is meanwhile taken into account. The problem is solved for an electrothermal installation with a single-ended resonant inverter. Results. We have obtained analytical dependences for calculating heating power and its harmonic components. We have defined inverter modes that show significant differences in operating levels of the harmonics. A method for regulating harmonic components of the heating power, based on changing the repetition rate of supplying gating pulses to thyristor, is proposed. Originality of the solution is affected by controlling the levels of individual harmonic components with an appropriate depth that eddy currents penetrate into a material, which makes it possible to change a heating zone which localize heating sources. Practical value of the research is that controlling the heating process by changing spectral composition and individual harmonics of the current expands the possibilities for forming predetermined temperature picture, and it is important for technologies of surface heating of machine parts.
Authors and Affiliations
Nataliia Dreshpak, Stanislav Vypanasenko, Lеonіd Meshrykov
Keywords
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