Improved short coil correction factor for induction heating of billets
2012 (English)In: 3rd International Symposium on High Temperature Metallurgical Processing, 2012, 373-382 p.Conference paper (Refereed)
To determine the heating rate of billets using 'short coils', an appropriate correction factor must be applied to the theoretical relationship. In 1945, Vaughan and Williamson published a semi-empirically modified Nagaoka coefficient applicable for moderate frequency induction heating processes (10 kHz). Recently it was demonstrated that the method of Vaughan and Williamson gives <10% error in the estimated power when heating aluminum billets at 50 Hz. In the present study, experiments have been conducted on aluminum billets in order to verify an empirical frequency corrected 'short coil' equation. Measurements of electrical conductivity (<± 0.5%), current (± 1%), heat (± 1-3%), and magnetic flux density (± 1-2%) have been performed. The results are compared with 1D analytical calculations, and 2D axial symmetric FEM modeling using COMSOL 4.2®. The frequency corrected equation has proven to provide accurate predictions of power (<4% error) within the frequency range 50 Hz to 500 kHz.
Place, publisher, year, edition, pages
2012. 373-382 p.
Billet, Heating, Induction, Magnetic field, Short coil
IdentifiersURN: urn:nbn:se:kth:diva-89169DOI: 10.1002/9781118364987.ch46ScopusID: 2-s2.0-84860809974ISBN: 978-111829141-2OAI: oai:DiVA.org:kth-89169DiVA: diva2:502771
3rd International Symposium on High-Temperature Metallurgical Processing - TMS 2012 Annual Meeting and Exhibition; Orlando, FL; 11 March 2012 through 15 March 2012
QC 201208032012-02-142012-02-142013-09-11Bibliographically approved