F - Mech Eng,Light,Heat,Weapons – 27 – D
Patent
F - Mech Eng,Light,Heat,Weapons
27
D
F27D 11/08 (2006.01) F27B 3/08 (2006.01) F27D 19/00 (2006.01) H05B 7/156 (2006.01) F27D 99/00 (2010.01) F27D 1/00 (2006.01)
Patent
CA 2057177
A feedback control system for the impedance con- trol of an electric arc furnace comprises at least one elec- trode, a hydraulic electrode actuator for adjusting the elec- trode, which actuator is adapted to be supplied with hydraulic fluid through a control valve, a controller, which is connec- ted to the valve actuator for the control valve, and impedance signal generator for delivering impedance signals to one input of said controller and a setpoint signal generator for deliver- ing a setpoint signal representing a desired impedance to an- other input of said controller. In order to prevent non-per- missible electrode oscillations in such a feedback control sy- stem it is proposed to provide a correcting stage for correcting the controller gain and to provide a correcting signal genera- tor for delivering to said correcting stage a signal which re- presents the controlled-system gain and which causes said cor- recting stage to change the controller gain in a sense which is opposite to a detected change of the controlled-system gain.
Aberl Heinrich
Rubenzucker Franz
Fetherstonhaugh & Co.
Voest-Alpine Industrieanlagenbau Gmbh
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