Temperature distribution in aluminum billets heated by rotation in static magnetic field produced by superconducting magnets

Fabbri, Massimo; Morandi, Antonio; Negrini, Francesco

doi:10.1108/03321640510571309

Cited by 20 publications

(11 citation statements)

References 5 publications

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“…Several new induction heating techniques have been reported recently. Researchers from the Universities of Bologna, Padua and Roma [13][14][15][16][17][18] used a DC high-temperature superconductive (HTS) winding to produce a high-intensity DC magnetic field, and the billet to be heated was rotated in this field. Figure 2 shows the principle of this induction heating technique.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of a Novel Mechanical to Thermal Energy Converter Based on the Inverse Problem of Electric Machines

et al. 2016

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A novel converter that can directly transform electrical, wind, hydraulic and other types of mechanical energy into thermal energy is presented in this study. First, the thermal energy of the converter is classified and then calculated by a finite element method. The eddy current distribution in the stator of the converter is also discussed. Second, the temperature field of the converter is calculated using a boundary element method. Subsequently, a thermal power-temperature coupled calculation method is presented to calculate the actual thermal power and temperature of the converter. The characteristic curves of the actual thermal power and the increase in water flow temperature are then presented based on the calculation results. Lastly, an experimental system is built, the thermal power and temperature of the converter are measured and the experimental results and the analytical calculations are compared.

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Section: Introductionmentioning

confidence: 99%

“…Lubin [19] applied a two-phase superconductive winding with two operating modes. The first mode is the same as the technique presented in [13][14][15][16][17][18]. In the second mode, the winding is supplied by a two-phase AC current with low frequency, and the billet remains stationary.…”

Section: Introductionmentioning

confidence: 99%

Investigation of a Novel Mechanical to Thermal Energy Converter Based on the Inverse Problem of Electric Machines

et al. 2016

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“…In order to analyze the heating process of the aluminum billet, the heating process will be discretized into a series of fine time steps. In each time interval, the physical parameters of the aluminum billet can be assumed to be constant because the temperature change can be negligible, which hardly affects the induced current density distribution in the aluminum billet [1], [11]. Therefore, the electromagnetic analysis process is a steady-state, and the physical parameters of the aluminum billet keep constant in each time interval.…”

Section: Methodsmentioning

confidence: 99%

“…1) The power supply system provides the energy needed during the heating process for the whole system; 2) The DC magnetic field system generates the DC magnetic field in the two airgaps of E-shaped iron core by utilizing the HTS magnet excited by DC; 3) The motor drive system drives the aluminum billet to rotate in the DC magnetic field. And in order to solve the large torque appearing at a low rotation speed, the motor drive system adopts an auxiliary motor system except for the main motor system [11]. The iron core guides the magnetic field to the billets and shields other rotating metal components from both being exposed to the magnetic field and thereby being heated.…”

Section: Mw Hts DC Induction Heatermentioning

confidence: 99%

Electromagnetic and Thermal Analysis of Cylindrical Aluminum Billet Heated by 1MW HTS DC Induction Heater

Yan

Dai

2020

IEEE Access

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In order to improve the efficiency of the conventional AC induction heater, an HTS DC induction heating technology has been proposed. A 1 MW HTS DC induction heater has been developed, and the efficiency of the HTS DC induction heater can be more than 80% due to the HTS DC magnet with no AC loss. The electromagnetic and thermal analysis of the HTS DC induction heater is necessary for further optimization of the 1 MW HTS DC induction heater. A 3D finite element simulation model for the coupling analysis of electromagnetic and thermal has been built based on the actual 1 MW HTS DC induction heater and optimized for accelerating the computing speed by using permanent magnet instead of the HTS magnet. The heating process of the cylindrical aluminum billet has also been simulated and compared with the experimental results. The results show that the simulation results can be in line with the experimental results. What is more, the optimized simulation model can be used to further optimize the device parameters for different workpiece temperature distributions, or design and evaluate the new HTS DC induction heater in the future. INDEX TERMS Induction heating, high temperature superconductor (HTS), aluminum, direct current (DC), electromagnetic and thermal analysis.

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“…These devices are applications of Lenz's Law and Joule Effect. The conducting object can be exposed to a variable magnetic field produced by AC winding (V. Rudnev & al., 2003;Lubin & al., 2009), or moved in a static magnetic field (Messadi & al., 2016;Fabbri & al., 2005;Mach & al., 2014).…”

Section: Introductionmentioning

confidence: 99%

Improved 3D electromagnetic analytical model for planar induction heater with consideration of transverse edge effects

Messadi

Hadjout

Ouazir

et al. 2020

COMPEL

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Purpose This paper aims to propose a new 3D electromagnetic model to compute translational motion eddy current in the conducting plate of a novel linear permanent magnet (PM) induction heater. The movement of the plate in a DC magnetic field created by a PM inductor generates induced currents that are at the origin of a heating power by Joule effect. These topologies have strong magnetic end effects. The analytical model developed in this work takes into account the finite length extremity effects of the conducting plate and the reaction field because of induced currents. Design/methodology/approach The developed model is based on the combination of the sub-domain’s method and the image’s theory. First, the magnetic field expressions because of the PMs are obtained by solving the three-dimensional Maxwell equations by the method of separation of variables, using a magnetic scalar potential formulation and a magnetic field strength formulation. Then, the motional eddy currents are computed using the Ampere law, and the finite length extremity effects of the conducting plate are taken into account using the image’s method. To analyze the accuracy of the proposed model, the obtained results are compared to those obtained from 3D finite element model (FEM) and from experimental tests performed on a prototype. Findings The results show that the developed analytical model is very accurate, even for geometries where the edge effects are very strong. It allows directly taking into account the finite length extremity effects (the transverse edge effects) of the conducting plate and the reaction field because of induced currents without the need of any correction factor. The proposed model also presents an important reduction in computation time compared to 3D finite element simulation, allowing fast analysis of linear PM induction heater. Practical implications The proposed electromagnetic analytical model can be used as a quick and accurate design tool for translational motion PM induction heater devices. Originality/value A new 3D analytical electromagnetic model, to find the induced power in the conducting plate of a novel translational motion induction heater has been developed. The studied heating device has a finite length and a finite width, which create edge effects that are not easily considered in calculation. The novelty of the presented method is the accurate 3D analytical model, which allows finding the real power heating and real distribution of the induced currents in the conducting plate without the need to use correction factor. The proposed model also takes into account the reaction field because of induced currents. In addition, the developed model improves an important reduction in the computation time compared with 3D FEM simulation.

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Temperature distribution in aluminum billets heated by rotation in static magnetic field produced by superconducting magnets

Cited by 20 publications

References 5 publications

Investigation of a Novel Mechanical to Thermal Energy Converter Based on the Inverse Problem of Electric Machines

Investigation of a Novel Mechanical to Thermal Energy Converter Based on the Inverse Problem of Electric Machines

Electromagnetic and Thermal Analysis of Cylindrical Aluminum Billet Heated by 1MW HTS DC Induction Heater

Improved 3D electromagnetic analytical model for planar induction heater with consideration of transverse edge effects

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