Multi-coil Induction Research Articles

Analysis of Multi Coil Induction Heating System for Semiconductor Processing

Analysis of Multi Coil Induction Heating System for Semiconductor Processing

Soft-Stop Optimal Trajectory Control for Improved Performance of the Series-Resonant Multiinverter for Domestic Induction Heating Applications

Induction heating technology is leading technical advances in home appliances due to the benefits inherent to the contactless energy transfer including high efficiency, fast heating, safety, cleanness, and accurate control, among others. Recent design trends are focused on developing more versatile cooking appliances for an improved user performance. To achieve such implementations, new multicoil architectures and power converters must be developed. This paper proposes the series-resonant multiinverter as an efficient, versatile, and cost-effective alternative to supply multiinductor systems. One of the main design challenges is the high blocking voltage of power devices, which may compromise the converter performance. This paper proposes an optimized modulation strategy to reduce the maximum device voltage, enabling an optimized converter design with improved reliability and performance. The proposed modulation is analytically studied and tested using a multicoil induction heating converter prototype, proving the feasibility of this proposal.

Finite-element discretisation of the eddy-current term in a 2D solver for radially symmetric models

This paper discusses the discretisation of the eddy-current term of the magnetoquasistatic subset of the Maxwell equations in a 2D setting with radial symmetry. It is shown that dedicated finite element shape functions are needed to make sure that particular distributions of the magnetic flux density and the electric field strength can be resolved exactly. Moreover, the shape functions should obey a partition-of-unity property and should achieve a prescribed convergence order. The 2D solver with radial symmetry is applied to calculate the performance of a multi-coil induction cooking system. Copyright © 2013 John Wiley & Sons, Ltd.

Particle Swarm Optimization of a Multi-Coil Transverse Flux Induction Heating System

In this paper the optimization of a transverse flux induction heating device by means of a parameter-free, self-adaptive particle swarm optimizer is presented. The novelty of this work is represented by the fact that concentric multi-coil induction heaters have never been optimized before in their full three-dimensional complexity. The main technical challenge of the problem consists in designing a single configuration capable of heating strips of different widths while satisfying geometrical, electrical and heating process constraints. It will be shown that a system consisting of three coils can successfully heat strips of widths between 600 mm and 800 mm with the required uniformity.

Lunar Surface and Subsurface Magnetic Susceptibility Instrumentation

Multicoil induction measurements of the lunar surface and subsurface magnetic susceptibility are under study. Major considerations are the improvement of the accuracy and logging ability of various probe configurations. Special boundary conditions of high vacuum, extreme ambient temperature variation, restriction to mechanically passive systems, simple electronics, low power and light weight all contribute to degradation of the accuracy of the instrument. Measurements in the range of 10 to 100,000 micro-oersted/gauss are of interest. Nonsedimentary rocks range from 40 to 1000 ?-oersted/gauss and the presence of nickel-iron meteoritic material may extend the range beyond the present limits of measurement. The determination of the presence or absence of meteoritic material is necessary to validate not only the accuracy of the susceptibility measurement, but also the accuracy of low level magnetometer measurements.