The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 16, 1979
Filed:
Oct. 03, 1977
Sven-Einar Stenkvist, Vesteras, SE;
Bjorn Widell, Vesteras, SE;
ASEA Aktiebolag, Vesteras, SE;
Abstract
A DC arc furnace having one or more arcing electrodes and a melt contact electrode transversely offset from the arcing electrode is provided on the outside of the furnace with control electromagnets which are supplied with DC for the purpose of keeping the arc substantially axially aligned with the arcing electrode. For more positive control of the arc direction, radiation sensing devices are provided and which are arranged to receive more or less radiation from the arc if it wanders away from its desired vertical alignment with the arcing electrode. In turn, these devices are used to control the power supplied to the control electromagnets to alter the strength of their magnetic flux, so that if it wanders from axial alignment with the arcing electrode, the arc is substantially immediately returned to that alignment.