International Journal of Applied Electromagnetics and Mechanics - Volume 76, issue 1-2

Authors: Abdi, Ammar | Barakat, Georges | Ouazir, Youcef | Amara, Yacine

Article Type: Research Article

Abstract: In this work, a 3D analytical magnetic model based on hybridation of the sub-domain’s method and the image’s theory to compute magnetic field and translational motion eddy current in the conducting plate of the Halbach permanent magnet induction heater planar topology is developed. The main objective is to remedy the problem of the transverse edge effect, and hence improving the efficiency of analytical model and the accuracy of results. The developed model also allows fast and precise simulations of 3D magnetic phenomena, and presents an important reduction in computation time compared to 3D finite element simulations.

Keywords: Eddy currents, 3D analytical solution, permanent magnet, induction heating, transverse edge effect, Halbach arrangement

DOI: 10.3233/JAE-230256

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 76, no. 1-2, pp. 241-255, 2024

Authors: Negro, Massimo | Galdi, Roberto

Article Type: Review Article

Abstract: The design of industrial rectifier transformers for use in the field of aluminum production requires the evaluation of the effects of current harmonics in the waveforms, in terms of electromagnetic fields interacting with the transformer’s constituent materials. The waveforms of the currents flowing through the windings and high-current output connections of transformers are highly distorted waveforms due to a high presence of harmonics that contribute significantly to the overall losses developed within the system causing overstress of the insulation materials. The evaluation of the electromagnetic effects of these harmonics cannot be approached by means of a time-harmonic steady-state study of …the problem, but a time transient must be simulated for a more accurate evaluation. Show more

Keywords: 3D, finite element method (FEM), transient, thermal, coupled, aluminium, rectifier, harmonics

DOI: 10.3233/JAE-230410

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 76, no. 1-2, pp. 257-269, 2024

Authors: Dahnoun, Larbi | Fontchastagner, Julien | Viguier, Christophe | Takorabet, Noureddine

Article Type: Research Article

Abstract: Electrical machines that can run at high speeds are more and more studied as they can respond to the increasing need of power onboard of aircrafts. However, to allow high-speed operability mechanical handling of the rotating parts need to be insured. In this paper an analytic design process of a novel high-speed induction machine is presented. The analytical magnetic and mechanical models developed are presented and validated with finite element simulations. The magnetic model is based on a classic equivalent electrical diagram of induction machine with a specific adaptation for the rotor leakage inductance as the squirrel cage is buried. …The mechanical model is based on a field displacement approach leading to the stress tensor in all the rotating part. A four degrees of freedom vibration analysis model considering gyroscopic effects based on Euler–Lagrange equation allows to identify the critical speeds of the system. It is shown that some geometrical parameters will have opposed effects on the two physics. Thus, an optimization-based coupling between the different physics allows to design rapidly the desired machine regarding any technical specifications as analytical models are being used. Show more

Keywords: Induction machine, high speed, analytical models, optimization

DOI: 10.3233/JAE-230241

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 76, no. 1-2, pp. 271-286, 2024