| 1. |
- Frogner, Kenneth, et al.
(författare)
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A new concept of coil design for industrial induction heating
- 2011
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Ingår i: Proceedings of the Swedish Production Symposium 2011, SPS11.
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Konferensbidrag (refereegranskat)abstract
- Abstract in UndeterminedThe demands for energy efficent heating solutions for the manufacturing industry can be met by a new induction heating platform, presented in this article. A new concept and technology to design and manufacture induction heating units is explained, evaluated and tested with successful results. The so called Greenheat technology relies on inductors built on Litz wiring moulded in soft magnetic composite; a flux conducting material produced using rotational casting methods. The aim of the article is to present and verify a hyphotesis of greatly improved induction heating results when modifying a traditional inductor design in four dependent steps. The verification is done using analytic solutions and FEM simulations as well as by experimetal work, clearly showing higher heating efficiency, no requirement for advanced cooling and a higher geometrical flexibility compared to existing heating solutions.
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| 2. |
- Frogner, Kenneth, et al.
(författare)
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Industrial heating using energy efficient induction technology
- 2011
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Ingår i: Proceedings of the 44th CIRP International Conference on Manufacturing Systems.
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Konferensbidrag (refereegranskat)abstract
- Abstract in UndeterminedThe demands for energy efficent heating solutions for the manufacturing industry can be met by a newinduction heating platform, presented in this article. A new concept and technology to design andmanufacture induction heating unit is presented, as well as a prototype induction heater, evaluated and testedin an industrial environment. Improvements compared to existing heating solutions can be clearly shown, e.g.higher heating efficiency, no requirement for advanced cooling, a higher geometrical flexibility and alsoenvironmental gains. The Greenheat platform is built on Litz wiring, SMC flux conductors, and a castingtechnology which is outlined in the article.
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| 3. |
- Frogner, Kenneth, et al.
(författare)
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Towards manufacturing of perfect magnets
- 2010
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Ingår i: Proceeding of the conference on Flexible Automation and Intelligent Manufacturing, FAIM2010.
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Konferensbidrag (refereegranskat)abstract
- Abstract in UndeterminedThe paper describes a magnetizing machine for producing permanent magnets of desired magnetization pattern by use of feedback control. This will in theory mean that an ideal magnetization pattern can be realized, what could be described as a perfect magnet. The machine is to be used for applications requiring high accuracy magnets in terms of the shape of the magnetized area. This is, for example, important for reducing cogging in electrical motors. Results of initial experiments involving use of the machine are presented. The functionality of the machine from a production standpoint and modifications of it that could be useful for mass production purposes, the properties of materials used for magnets, processes involved in manufacturing workpieces that are to be magnetized are discussed. Applications that can benefit from use of a machine of this type are compared with more traditional solutions.
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| 4. |
- Akujärvi, Ville, et al.
(författare)
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Mapping of magnetic properties for simulations of high-Temperature electromagnetic applications
- 2017
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Ingår i: COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering. - 0332-1649. ; 36:2, s. 546-554
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Tidskriftsartikel (refereegranskat)abstract
- Purpose -The purpose of this paper is to investigate the added value of using temperature-dependent electric and magnetic properties in high-Temperature electromagnetic simulations. Design/methodology/approach - In this work, the electromagnetic properties of Domex 420, SSAB, have been characterized as a function of the temperature, from room temperature to 900°C. The measurement of the electric and magnetic properties was performed inside a vacuum furnace at a number of discrete temperature steps, with particularly small intervals around the Curie temperature. A simple transient multi-physics model was used to investigate the impact of the measured properties in three different representations. Findings - In certain intervals, a simplified approximation of the properties produces accurate results, while fully parametric representation is beneficial when heating above the Curie temperature. Originality/value -Temperature-dependent electromagnetic properties are rarely found, especially in an easy-To-use form. Using parameterized temperature-dependent approximation of key properties shows noteworthy differences in the outcome of high-Temperature electromagnetic modeling.
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| 5. |
- Frogner, Kenneth, et al.
(författare)
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A method for fast characterization of power efficiency in induction heating processes
- 2012
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Ingår i: ; , s. 303-309
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Konferensbidrag (refereegranskat)abstract
- A method for fast and precise measurement of effciency in induction heating processes is evaluated and tested. The method, based on thermal imaging is presented with advantages and drawbacks based on results from coupled transient simulations and from experimental results. The experiments are performed using two different induction heating platforms, equipped with high quality measurement equipment, including a thermal camera, capable of streaming 16 bits radiometric data for image recording on a computer. Post-processing of the recorded data, including compensation of camera position and integration of electrical and thermal properties is explained and the results presented with pictures of each step. Also some basic knowledge of radiometric measurement of temperature is described to better understand the possibilities and to avoid unnecessary pitfalls. Guidelines of how to choose the best equipment or setup forms the conclusion of the article, providing a method that can be used also for other applications.
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| 6. |
- Frogner, Kenneth, et al.
(författare)
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Analysis of Current Paths in Induction Heating of flat sheets using single sided Longitudinal Field Inductors
- 2012
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Konferensbidrag (refereegranskat)abstract
- Longitudinal field inductors are frequently used in the industry for heating of flat objects. This paper aims to illustrate the current paths for the inductor design as a function of workpiece geometry using 3d FEA simulations. The results show how different parameters affect the heating pattern, creating guidelines for the optimal design depending on the requirements and applications. The simulation results are verified using experimental data.
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| 7. |
- Frogner, Kenneth, et al.
(författare)
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Induction heating of carbon fiber structures - properties and challenges
- 2014
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Ingår i: [Host publication title missing].
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Konferensbidrag (refereegranskat)abstract
- Carbon fiber reinforced plastic is constantly gaining market shares due to its unique properties. By heating this kind of materials using induction, many new applications occur. The high resistivity and anisotropic properties of carbon fiber composites means there are a number of challenges to overcome. This work emphasizes the key components related to induction heating of complex materials and present ways to characterize the important properties using non-contact methods. Successful experimental results are presented and the work also shows very good agreement between measurements and simulations.
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| 8. |
- Frogner, Kenneth, et al.
(författare)
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Induction heating using a 2-phase travelling wave setup
- 2014
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Ingår i: International Journal of Applied Electromagnetics and Mechanics. - 1383-5416. ; 44:2, s. 217-226
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Tidskriftsartikel (refereegranskat)abstract
- Abstract in UndeterminedA laboratory implementation of a two-phase travelling wave induction heating setup is described. The focus is the development of a versatile power control system for multi-coil experiments and parameter studies.The drive system features high temporal accuracy, full real-time controllability, and integrated measurement technology, analyzed step wise. The performance was tested using a full pitch travelling wave inductor based on litz wire with a flux concentrator from a powder material. Thermographic images from the experiments are presented and the results are compared with simulations. The challenges related to multi-coil configurations are explained, many of which are difficult to predict from simulations.
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| 9. |
- Frogner, Kenneth
(författare)
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Industrial Induction Heating - with a focus on multi coil solutions
- 2014
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Most types of materials and components use heating during the manufacturing process, with a large potential for cost and energy savings. Induction heating is the most energy efficient industrial heating technology for many applications, but so far technical limitations has delayed large scale introduction. The difficulties relate to heating of large flat and curved surfaces, and, perhaps most important of all, the difficulties in achieving a uniform heat distribution. The efficiency of existing industrial induction heating systems on the market is often low, with clear demands for improvement. The first part of this work aims to improve the efficiency and manufacturability of induction heaters. By combining a newly developed core material, a silicon-iron powder composite, with litz wire for high frequency applications, very high efficiency heaters can be manufactured. The powder composite can be molded into any size and shape which allows building large, complex structures with integrated cooling. The results from this work have been commercialized and an increasing number of companies can benefit of substantial economical and energy savings in the production. The second part of the work concerns investigating a type of induction heating based on several coils, in order to achieve uniform heating. The method is called travelling wave and characterized by a fast propagating electromagnetic field that moves along the workpiece. The challenges related to multi-coil solutions are many, because of the interaction between the currents in the coils. The work contains results of the system behavior based on analytical models, simulation results of the heating pattern, and above all, experimental validation of the models. The general accuracy of the analysis of travelling wave systems has been greatly improved. Solutions to the challenges limiting the practical use of travelling wave systems are presented. Combining the new materials and production methods developed for induction heaters, with the technology of multi-coil heating has the potential to greatly improve the output from industrial processes in terms of cycle time, energy efficiency and product quality. For thermal cycling operations, the thermal mass is a huge problem. Given a method to supply uniform heating of thin workpieces provides entirely new conditions for many industrial processes; considerably reduced energy consumption, an increased production rate and products with new and improved properties.
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| 10. |
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