Abstract
The transverse flux heating (TFH) concept offers very high electrical efficiency in combination with unique technological flexibility. Numerous advantages make this method beyond competition to be applied in e.g. continuous strip production and processing lines. However, all potential advantages of TFH can be realized in practice only by optimal design of the inductor shape and optimal control of the heaters, using numerical modelling and optimization techniques. The paper describes a successive approach to optimal design of a single layer induction coil, which will be used for onesided TFH of moving thin steel strip with constant width. The peculiarity of the design refers to the very slow movement speed of the strip and the target temperature, which is set below Curie.
Highlights
The continuous heating of thin metal strip is an important process step in many industrial production lines
The paper describes a successive approach to optimal design of a single layer induction coil, which will be used for onesided transverse flux heating (TFH) of moving thin steel strip with constant width
Due to the different fields of application of strip heating for a wide variety of materials, the strip temperatures to be achieved are in the range of a few 10 °C for drying and up to 1200 °C for hot-forming
Summary
The continuous heating of thin metal strip is an important process step in many industrial production lines. [2] Today, conventional heaters such as gas or oil fired furnaces are still widely spread All of these installations are working by the principle of heat transfer to the workpiece through the surface. Based on the laws of thermodynamics, the atmosphere in the oven always has to be warmer than the goal temperature of the workpiece This technique ensures homogeneous and through heating of the material, there are a variety of disadvantages and restrictions like the large size of the installations, long heating time, high thermal losses, limited power density and speed of motion, intensive scale formation on the materials surface and environmental pollution. For the heating of continuous moving metal strip, two processes have become established in industry: the longitudinal flux heating (LFH) and the TFH Both methods are based on the same heating method, but differ by the direction of the magnetic flux, which is parallel to the workpiece plane for LFH and normal for TFH.
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