Induction Heating of Aluminum Billets With Linear Motion in a Strong DC Magnetic Field: Magnetothermal Analysis in Two-Dimensional

Abstract

This paper presents a new structure of an induction heater for aluminium billets. The device consists in using a strong DC magnetic field created by a superconducting inductor in which the conducting billet is actuated by a linear motion at a constant velocity. The analysis, based on the analytical model for the magnetic field in the billet, has been developed, and then the eddy currents and induced heating power have been evaluated. The analytical results are compared to those issued from a finite element software (COMSOL). The magneto thermal analysis shows that the temperature profile in the billet is homogenous.

Five‐phase travelling wave induction heater for continuous heating of flat material

“…Analytical methods are more suitable for the integral parameters calculation and analysis. Also, this method is more convenient for simple geometries calculations and some assumptions or sometimes reduction of dimension may be essential [2, 6]. Whereas, the finite‐element methods (FEMs) are more universal and it's very useful for analysing the induced eddy currents and power distribution if a high accuracy is demand, such as consideration of the both edge‐effects and slots effects of the induction end workpiece.…”

“…These features may be achieved in the best manner by the so‐called travelling wave induction heating, which has concerned from many industrial applications in the field of heating flat materials [5, 6].…”

Closed and quasi‐closed yoke configurations for travelling wave induction heaters

“…For the same reason, salient poles and non‐uniform air‐gap, some of the magnetic flux lines leak out the yoke and diverge out the area faces of the heater, which causes unfocused induced eddy current and reduces heat generation; this is the second drawback of the TW inductor. Those could affect the power is to be transferred efficiently from the coil to the load [6].…”

Development and Test of One Commercial Megawatt Superconducting DC Induction Heater With Extra High Energy Efficiency

“…However, the subsequent efficiency analysis indicated that the overall energy efficiency of this HTS AC induction heater for nonmagnetic metal billets does not exceed 60% and need to be faced with new problems because it is still unavoidable for HTS windings to suffer serious AC losses and the resulting quench of HTS coils from Joule heat. In addition, the problem of low heating depth along radical direction caused by skin effect is also unavoidable in electromagnetic induction heating process [9]- [11]. Reduce the frequency of alternating current (even as low as 3 -7 Hz) to obtain large heat penetration depths may be a solution, but it is difficult to achieve under the premise of high heating efficiency.…”