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Promising high efficiency technology for the induction heating of aluminium billets

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The paper gives an overview on the results of a joint research program supported by the MIUR (Italian Ministry for University and Research) and developed by the Universities of Bologna, Padua and Rome on a new promising high efficiency technology recently proposed for the induction heating of aluminum billets. Streszczenie. W pracy dokonano przeglądu wyników projektu badawczego wykonanego wspól[...]

Field models of induction heating for industrial applications DOI:10.15199/48.2018.03.01

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In the community of computational electromagnetics, the set of benchmark problems proposed by the TEAM (Testing Electromagnetic Analysis Methods) series of workshop is a reference for testing numerical methods in a comparative way [1]-[2]. Nevertheless, there is a lack of problems specifically focused on induction heating devices, as far as numerical modelling is concerned. More generally, in the past some benchmarks of induction heating was proposed, but the attention was focused rather on the inverse problem [3]-[7] related to the optimal design of the power inductor than on the direct problem of field analysis [8], [9]. In fact, in computational induction heating, analysis problems are challenging because they involve different physical domains; therefore, the development of non-linear coupledfield models and the consequent choice of suitable solvers is mandatory [8]-[10]. Too often numerical solvers, like e.g. finite-element solvers which are commercially available, are used by designers as general-purpose black boxes. Moving from this background, it was proposed to define a benchmark of coupled-field analysis [5]; the problem is taken from industrial applications of induction heating: it deals with the transient thermal analysis of a steel-made cylindrical billet, subject to the changing magnetic field of a multi-turn winding. It is a clear example showing that stiff analysis problem can originate even in the case of very simple geometries. Benchmark description: the device The device under study is composed of an inductor winding and a cylindrical billet; winding and billet are coaxially located. A. Geometry The billet has a radius r and height h. The inductor is made of 20 hollow circular turns, connected in series; each of them has height hc and width wc, while their radial distance from Y axis is rc. The thickness of the copper of each hollow turn is tc. Numerical data about the geometry are summarized in Table [...]

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