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Leinì, Italy

Dughiero F.,University of Padua | Forzan M.,University of Padua | Sieni E.,Inova Laboratory Srl
COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering | Year: 2010

Purpose: The purpose of this paper is to describe how numerical models of human body have been applied for the evaluation ofcurrent density induced by strong magnetic field, toverify the respect of the basic restriction proposed by International Committee Non Ionizing Radiation Protection (ICNIRP) guidelines. Design/methodology/approach: Finite element method has been used in order to compute the induced current density in a suitable human body model and a simplified model-a homogeneous cylinder-due to a time-varying magnetic field. Findings: In the practical case of a resistance welding equipment, the implemented computational technique has been used in order to evaluate both the magnetic flux density and the induced current density in different tissues. Their values have been also compared with the ones obtained in a homogeneous cylinder. Practical implications: The proposed method can be used in order to evaluate the compliance of the magnetic field produced by resistance welding equipments with ICNIRP limits. Originality/value: A realistic model of human body has been used. In the paper, the difference on magnetic flux density and corresponding current density values is pointed out for various source positions using a heterogeneous tetrahedral human body model. © Emerald Group Publishing Limited. Source


Dughiero F.,University of Padua | Forzan M.,University of Padua | Lupi S.,University of Padua | Nicoletti F.,University of Padua | Zerbetto M.,Inova Laboratory Srl
COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering | Year: 2011

Purpose - Low electrical resistivity metal billets can be heated by the currents induced by the rotation of the billet itself inside a transverse DC magnetic field produced by a superconductive coil. The main drawback of this approach is related to cost of installation that requires an adequate refrigerating system. The purpose of this paper is to propose a more convenient solution, which allows the same high efficiency to be achieved at lower cost. In this solution, the billet is kept still and a series of permanent magnets, positioned in the inner part of a ferromagnetic frame, is rotated. Design/methodology/approach - Some results of the new induction system are shown. These results are obtained applying for the electromagnetic solution both an FE commercial code and an analytical method. The analytical code is developed because several parameters of the system need to be optimized. Findings - The performance of the solution presented is comparable with those of the system with superconductive coils. The results of the two methods applied are in good agreement; thus the analytical code is validated. Originality/value - A new solution for the induction heating of aluminum billets is presented. The analytical code developed requires a very short computational time, also because it gives directly the steady-state condition of the system and, for this reason, it can be conveniently applied to an automatic design process. © 2011 Emerald Group Publishing Limited. All rights reserved. Source


Dughiero F.,University of Padua | Forzan M.,University of Padua | Garbin M.,University of Padua | Pozza C.,University of Padua | Sieni E.,Inova Laboratory Srl
COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering | Year: 2011

Purpose - The purpose of this paper is to present two simulation strategies for tube induction welding process. Coupled electromagnetic and thermal problem is solved by applying 3D FEM models. The resulting power density and temperature distribution are compared. Design/methodology/approach - FE analysis has been used in order to compute the magnetic and thermal field in a suitable 3D model. Findings - Two strategies for coupled magnetic and thermal simulation with movement are proposed. Practical implications - Reported strategies can be used to design tube induction welding devices and to verify the influence of the main parameters of the process, i.e. welding velocity, frequency, specific and total power. Originality/value - The paper summarizes two different simulation strategies taking into account the movement of the tube through the inductor. In the first strategy, the tube heating is simulated by providing the mean power absorbed by a tube section crossing the inductor. In the second strategy, a spatial translation of the material properties is implemented. © 2011 Emerald Group Publishing Limited. All rights reserved. Source


Dughiero F.,University of Padua | Forzan M.,University of Padua | Zerbetto M.,Inova Laboratory Srl
Proceedings, IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society | Year: 2014

Permanent Magnet Heaters, PMH, have been recently proposed as a possible high efficiency solution for the heating of high conductive metals. The optimal design of a Permanent Magnet Heater is presented with reference to a real industrial case. The design has been carried out by means of transient magnetic and thermal 2D and 3D Finite Element Models coupled with multiobjective optimization algorithms. © 2014 IEEE. Source


Zerbetto M.,Inova Laboratory Srl | Forzan M.,University of Padua | Dughiero F.,University of Padua
Materials Today: Proceedings | Year: 2015

Aluminum billets are heated at a prescribed temperature before hot working in gas or induction or resistance furnaces. Temperature distribution variable along the billet axis, or 'taper profile' with the initial section hotter than the final part of the billet, improves the extrusion process (isothermal extrusion). Taper temperature distribution is typically realized in induction heater thanks to the accurate control that this technology allows in thermal processing. Permanent Magnet Heaters, PMH, have been recently proposed as a high efficiency solution for the heating of electrically conductive materials. The optimal design of a Permanent Magnet Heater is presented with reference to a real industrial case. The design has been carried out by means of transient magnetic and thermal 2D and 3D Finite Element Models coupled with multiobjective optimization algorithms. © 2015 The Authors. Source

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