Abstract
The planar induction heating possesses more difficulties in industry application compared with traditional spiral induction coils in mostly heat treatment processes. Numerical approaches are adopted in the power distribution and temperature prediction during the induction heating process, which has a relatively low computational efficiency. In this work, an analytical calculation model of the planar induction heating with magnetic flux concentrator is investigated based on the uniform moving heating source. In this model, the power density in the surface of the workpiece induced by coils is calculated and applied into the analytical model of the temperature calculation using a uniform moving heat source. Planar induction heating tests are conducted under various induction coil parameters and the corresponding temperature evolution is obtained by the infrared imaging device NEC R300W2-NNU and the thermocouples. The final surface temperature prediction is compared to the finite element simulation results and experimental data. The analytical results show a good match with the finite element simulation and the experimental results, and the errors are in reasonable range and acceptable. The analytical model can compute the temperature distribution directly and the computational time is much less than the finite element method. Therefore, the temperature prediction method in this work has the advantage of less experimental and computational complexity, which can extend the analytical modeling methodology in induction heating to a broader application.
Highlights
Induction heating usually is applied as the main heating means in various heat treatment processes [1,2], for example, induction hardening, tempering, stress relieving
The coil required for the planar induction heating is significantly different from the traditional spiral coils, in which the magnetic field distribution is difficult to effectively concentrated, the air impedance of the system loop is too large and the heating temperature is not uniform and difficult to control accurately [5,6,7]
The and induction coils analysis are made rectangular tube with low electric-magnetic field variables the generation of the eddy power density are calculated by the induction heating process is respectively conducted
Summary
Induction heating usually is applied as the main heating means in various heat treatment processes [1,2], for example, induction hardening, tempering, stress relieving. [14] focuses on the modeling and design of the induction coils in a brazing process by finite element method. Numerical simulation based on the finite element method made in the induction heating process. [19] uses a multi-physics mathematical precision in the analytical modeling of the induction heating process should be made more progress, model to analysis the electromagnetic and thermal fields in axial symmetric inductor system. In order to verify the temperature profile, experimental methods usually are used during the heating process should be made more progress, especially in the planar inductor system. Authors present an analytical model to calculate the temperature profile during the planar induction heating process with magnetic flux concentrator.
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