NDLI: Solenoidal Bi-2223/Ag induction heater for aluminum and copper billets

Content Provider	IEEE Xplore Digital Library
Author	Hiltunen, I. Korpela, A. Mikkonen, R.
Copyright Year	2002
Abstract	Induction heating is widely used to heat up aluminum and copper billets before extrusion. Resistive induction heating systems, which typically have the total efficiency of 50-60%, are generally used with ac current. By utilizing superconductivity, the total efficiency of induction heating system can be increased to approximately 90%. If the heating power of conventional induction heaters can be reached with a superconducting device, resistive systems could be replaced by superconducting ones, and remarkable savings would develop in the long run. In this paper the feasibility of Bi-2223/Ag induction heater is studied. A solenoidal magnet for induction heating of aluminum and copper billets is designed. Ac losses are a considerable problem in Bi-2223/Ag magnets. Thus, dc current is utilized and the eddy currents are generated by rotating the billets. Coil design aimed to maximize the heating power by maximizing the radial gradient of the magnetic flux density in the heating area. In the design procedure the optimization algorithm Sequential Quadratic Programming was coupled with electromagnetic field computation by means of Finite Element Method. The quench current of the coil was determined based on the stability analysis of conduction-cooled Bi-2223/Ag magnets.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2356
Ending Page	2359
Page Count	4
File Size	242921
File Format	PDF
ISSN	10518223
Volume Number	15
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Aluminum Copper Billets Superconducting magnets Magnetic flux Coils Heating Superconductivity Superconducting devices Eddy currents induction heating Bi-2223/Ag coil optimization
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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