Yüksek verimli indüktif bobin dizinleri

Inductive heating is widely exploited in industrial operations including metal hardening, forging and brazing. Recently, as a promising alternative to traditional heating, inductive heating has attracted substantial commercial interest for domestic cookers. This is because inductive heating offers fast, precise and efficient heating compared to traditional methods that make use of either convection or conduction as a means of heat transfer. To introduce full flexibility in using the cooking space, a strong demand is currently directed toward all-surface induction ovens, with the capability to heat a vessel placed arbitrarily anywhere on the surface of the induction cook top. For this purpose, inductive coils of tens of mm in diameter are required to be designed and stacked together to form coil arrays. However, this typically comes at the cost of reduced efficiency. To address this problem, this thesis work focuses on high-efficiency coil arrays designed for all-surface induction with optimum ferrite placement. The thesis work proposes and demonstrates unique coil geometry and array stacking that utilizes mutual coupling between the coils for substantially increased efficiency. Here analytical, numerical and experimental electromagnetic analyses of sample coils are performed. Effects of different ferrite placements are investigated and, contrary to the general intuition of placing ferrite bars only under the coil, an effective way of ferrite placement is proposed and shown. These results indicate that the proposed high-efficiency arrays of inductive coils are highly promising for all-surface inductive heating.