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Induction Heating of Aluminum Billets Using Superconductors

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Induction Heating of Aluminum Billets Using Superconductors

Niklas Magnusson and Magne Runde SINTEF Energy Research, Trondheim

Track: EXTRUSION EQUIPMENT - Induction/Billet Temperature

ABSTRACT --- In conventional induction heating of aluminum extrusion billets large
losses occur in the copper coils and therefore the energy efficiency is poor, only 55-
to-60 percent for modern 1MW class heaters. Two methods are proposed to
improve the efficiency by using high-temperature superconductors (HTS): One
where the copper conductors are simply replaced by HTS and one where the
aluminum billet is rotated in a direct-current magnetic field generated by direct
current in an HTS coil. The first method is tested by building a 5kW model. These
tests show a significant potential for energy savings. The second method includes
an entirely new concept. It takes advantage of that HTS are practically loss-free
under direct current conditions (in contrast to alternating current conditions where
losses occur). Hence, generation of a direct current magnetic field becomes
energetically inexpensive and the efficiency of this second method is determined by
the energy efficiency of the motor rotating the billet.

© Extrusion Technology for Aluminum Profiles Foundation (ET Foundation). All rights reserved. No part of The Proceedings may be reproduced in any form without the express written permission of the ET Foundation.