Abstract
This chapter is the second introductory chapter of the book. It deals with the basic laws of electromagnetic fields and describes some specific phenomena occurring in electro-heat technologies. In particular, the electromagnetic wave diffusion in a conductive half-space is presented and the basic quantities that characterize the thermal processes based on internal heating sources are given. The penetration depth of the electromagnetic wave is a parameter that characterizes all the relevant phenomena in these applications. A qualitative description is provided of several effects influencing the distribution of the current density and, as a consequence, the heating sources in the heated workpieces: the proximity effect (that occurs between two conductors that carry electrical current), the ring effect (that occurs in bended conductors), the slot effect (that occurs in conductors placed in the slot of a magnetic yoke), and the end and edge effects (that occur due to the finite length of inductor and load and their relative position).
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Lupi, S. (2017). Electromagnetic Fields in Electro-technologies. In: Fundamentals of Electroheat. Springer, Cham. https://doi.org/10.1007/978-3-319-46015-4_2
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DOI: https://doi.org/10.1007/978-3-319-46015-4_2
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