This paper presents a new structure of an induction heater for aluminium parallelepiped workpiece. The studied device uses a magnetic field created by a permanent magnets (PM) inductor (Halbach inductor) in which the conducting workpiece is subjected to a linear oscillatory motion with alternating velocity. An analytical electromagnetic model is developed to find the induced heating power in the workpiece. To consider the transverse edge effect, an analytical corrected model is also presented. The most important results obtained by these models are verified experimentally on a prototype. Index Terms-, analytical model, oscillatory linear motion, permanent magnet, transverse edge effect. 0018-9464 (c)

An electromagnetic model is proposed to compute translational motion eddy current in a conductive plate. The eddy currents are due to the movement of the plate in a dc magnetic field created by a PM inductor. Firstly, the magnetic field due to the PMs is computed in 3D where the iron yokes influence is considered thanks to the method of images. Then, the motional eddy currents are computed such that the edge effects are correctly taken into account through an iterative procedure which uses magnetic images. The computations are very fast and the obtained results are close to those issued from 3D FE method and from experiments.

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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.