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| Number | Title | Issue Date |
| 7313160 | Regulation system analysis method A furnace's operating efficiency is improved by simultaneously monitoring various furnace operating parameters such that the monitored values may be collectively examined and correlated to determine if the furnace is sub optimally operating. In particular, the elect... | 12/25/2007 |
| 7257146 | System and method for controlling power across multiple electrodes in a furnace A method and system for stabilizing energy consumption in multiple loads, or in single multi-phase loads. The method and system also compensates for unbalance in multi-phase loads. A central controller monitors variable reactances in the loads and identifies situati... | 08/14/2007 |
| 7212561 | System and method for controlling electrical power across multiple furnaces using variable reactors A method and system for stabilizing energy consumption in multiple loads, or in single multi-phase loads. The method and system also compensates for unbalance in multi-phase loads. A central controller monitors variable reactances in the loads and identifies situati... | 05/01/2007 |
| 7180931 | Electrode immersion depth determination and control in electroslag remelting furnace An apparatus and method for controlling an electroslag remelting furnace comprising adjusting electrode drive speed by an amount proportional to a difference between a metric of electrode immersion and a set point, monitoring impedance or voltage, and calculating th... | 02/20/2007 |
| 6980580 | Electrode arrangement as substitute bottom for an electrothermic slag smelting furnace The electrode arrangement uses vertically oriented electrodes with side wall contacts for an electrothermic smelting furnace for aluminum production. The side wall contacts are radially moveable into the furnace to compensate for wear on the contacts. The side wall ... | 12/27/2005 |
| 6934039 | Method and apparatus for measurement of a consumable electrode A method of measuring the instantaneous parameters of a consumable electrode by: (a) providing a laser measuring device and positioning the laser measuring device in the vicinity of the electrode to be measured; (b) activating the laser measuring device to obtain da... | 08/23/2005 |
| 6614832 | Method of determining electrode length and bath level in an electric arc furnace A method for the continuous determination of the distance between an electrode tip and level of a bath in an electric arc furnace so as to be able to exactly determine electric energy consumption per tonne of scrap actually melted, electrode wear and the ... | 09/02/2003 |
| 6603795 | Power control system for AC electric arc furnace A power control system for an AC electric arc furnace. The control system includes variable reactors located intermediate a furnace power supply and arc electrodes that are height adjustable. The control system monitors operating characteristics of the fu... | 08/05/2003 |
| 6496530 | Control of electrode depth in electroslag remelting A method of and apparatus for controlling an electroslag remelting furnace by driving the electrode at a nominal speed based upon melting rate and geometry while making minor proportional adjustments based on a measured metric of the electrode immersion d... | 12/17/2002 |
| 6411643 | Automatic electrode regulator based on direct power factor regulation and method Disclosed is an electrode control system for an electric arc furnace having a furnace transformer. The electrode control system includes a current transformer for measuring operating current of the electrode and a voltage transformer for measuring operati... | 06/25/2002 |
| 6330270 | Method for weighing electrodes in electric smelting furnaces The present invention relates to a method for weighing an electrode submerged in the charge of an electric smelting furnace. The electrode is moved in vertical direction at least once, whereafter the electrode is lifted and the weight of the electrode is ... | 12/11/2001 |
| 6178191 | Method for determination of the tip position of consumable electrodes used in electric smelting furnaces The present invention relates to a method for determination of the electrode tip position for consumable electrodes in electric smelting furnaces, which electrodes being submerged in the furnace charge. The voltage between two geometrically displaced poin... | 01/23/2001 |
| 6115405 | Method and an arrangement for determining the height position of an electrode An arrangement and method for determining the height position of a vertically movable electrode (2) in an arc furnace (1). The arrangement includes an elongated, flexible element (9), preferably a heavy chain, whose one end is attached to a first attachme... | 09/05/2000 |
| 6115404 | Dynamic control of remelting processes An apparatus and method of controlling a remelting process by providing measured process variable values to a process controller; estimating process variable values using a process model of a remelting process; and outputting estimated process variable va... | 09/05/2000 |
| 5960027 | Apparatus for controlling arc deflection in an arc furnace An arc control apparatus for a DC arc furnace provides an additional magnetic field which prevents a discharged arc from shifting outward at an arc generating point due to the influences of a magnetic field generated by a feeder circuit, thus directing th... | 09/28/1999 |
| 5930284 | Multiple input electrode gap controller A method and apparatus for controlling vacuum arc remelting (VAR) furnaces by estimation of electrode gap based on a plurality of secondary estimates derived from furnace outputs. The estimation is preferably performed by Kalman filter. Adaptive gain tech... | 07/27/1999 |
| 5737355 | Directly induced swing for closed loop control of electroslag remelting furnace An apparatus and method for controlling an electroslag remelting furnace, imposing a periodic fluctuation on electrode drive speed and thereby generating a predictable voltage swing signal. The fluctuation is preferably done by imposition of a sine, squar... | 04/07/1998 |
| 5715273 | Secondary circuit with variable impedance for electric arc furnaces A secondary circuit having a variable impedance for electric arc furnaces of a type working with alternating current, which is associated with a transformer (11) is disclosed. A secondary circuit comprises at least one rigid connection (12) connected to t... | 02/03/1998 |
| 5708677 | Arc voltage distribution skewness as an indicator of electrode gap during vacuum arc remelting The electrode gap of a VAR is monitored by determining the skewness of a distribution of gap voltage measurements. A decrease in skewness indicates an increase in gap and may be used to control the gap.... | 01/13/1998 |
| 5687187 | Process and device for regulating the position of the tip of an electric furnace electrode A process and a device for regulating the position of the tip of an electrode immersed in an electric furnace heated by electric arc or resistance heating. To precisely measure the position of the electrode tip and to position it in operation, a series of... | 11/11/1997 |
| 5627454 | Method for stabilizing a power supply network against reactive load fluctuations, and a power factor compensation device During operation, DC arc furnaces (8) produce undesired reactive load fluctuations which are compensated by means of a power factor compensator (31). An AC power controller (28) of the power factor compensator (31) is controlled as a function of a stabili... | 05/06/1997 |
| 5568506 | Constant voltage electro-slag remelting control A system for controlling electrode gap in an electro-slag remelt furnace has a constant regulated voltage and an eletrode which is fed into the slag pool at a constant rate. The impedance of the circuit through the slag pool is directly proportional to th... | 10/22/1996 |
| 5557631 | Sonic furnace monitoring apparatus Apparatus and method for obtaining accurate sonic input data from a metallurgical furnace, for accomplishing accurate control of a lance injecting oxygen and/or other substances into the melt. A remotely located hydrophone is placed in sonic communication... | 09/17/1996 |
| 5539768 | Electric arc furnace electrode consumption analyzer An electric arc furnace includes at least one electrode projecting into a furnace vessel for containing a charge to be heated and electrode support structure for moving the electrode in a direction along a path towards and away from the charge. An improve... | 07/23/1996 |
| 5533044 | Method of electrode regulation of a DC arc furnace and electrode regulation device DC arc furnaces have a current regulator for maintaining the current of an arc constant and an electrode regulator for affecting the position of an electrode of the arc furnace and thus the length of the are. Adjustment of the position of the electrode ta... | 07/02/1996 |
| 5467366 | Electrode system The invention relates to an electrode system for melting and stirring and also for temperature control in metallurgical vessels. To achieve optimum energy utilization with minimal gas consumption, the electrode system comprises, according to the invention... | 11/14/1995 |
| 5410564 | Direct current electric furnace for melting metal According to the present invention, there is provided a direct current electric furnace for melting metal capable of melting scraps rapidly and also capable of diminishing cold and hot spots formed on the furnace wall, wherein the direct current electric ... | 04/25/1995 |
| 5406581 | Control system for electric arc furnace An improved arc furnace regulator employs neural circuits connected in a multi-layer network configuration with various weighted relationships between the successive layers which are automatically changed over time as a function of an error signal by mean... | 04/11/1995 |
| 5351267 | Process for electrode control of a DC arc furnace, and an electrode control device Direct current arc furnaces (8) have a current regulator (14) for maintaining the current of an arc (10) constant, and an electrode control (18) for affecting the position of an electrode (7) of the arc furnace (8) and thus the length of an arc (10). Cont... | 09/27/1994 |
| 5331661 | Method and apparatus for controlling electroslag remelting Method and apparatus for controlling electrode immersion depth in an electroslag remelting furnace. The phase difference of the alternating current circuit established in the furnace is calculated in real time and employed to more accurately control immer... | 07/19/1994 |
| 5274664 | Method and device to control the force applied to the electrode-bearing arms of an electric arc furnace Method and device to control the force applied to the electrode-bearing arms of an electric arc furnace, the vertical regulation of the electrodes being achieved with an electrohydraulic or electropneumatic system consisting of an operational cylinder act... | 12/28/1993 |
| 5255285 | Feedback control system for the impedance control of an electric arc furnace A feedback control system for the impedance control of an electric arc furnace having at least one electrode, a hydraulic electrode actuator for adjusting the electrode. The actuator is adapted to be supplied with hydraulic fluid through a control valve. ... | 10/19/1993 |
| 5239554 | Direct-arc electric furnace fed with controlled current and method to feed a direct-arc furnace with controlled current Method to feed a three-phase direct-arc electric furnace with controlled current and also a three-phase electric furnace thus fed for the smelting of metals, e.g. iron-based alloys, the furnace comprising means (GI) for regulation of the length of the arc... | 08/24/1993 |
| 5204872 | Control system for electric arc furnace An improved arc furnace regulator employs neural circuits connected in a multi-layer network configuration with various weighted relationships between the successive layers which are automatically changed over time as a function of an error signal by mean... | 04/20/1993 |
| 5189682 | Method for increasing the efficiency of a direct current electric arc furnace The invention provides a direct current electric arc furnace which is composed of a feeding system of direct current to the furnace, a movable electrode at the roof of the furnace, and a bottom electrode attached to the bottom of the furnace at the positi... | 02/23/1993 |
| 5155740 | Flicker compensating apparatus for DC arc furnace A flicker compensating apparatus for compensating for flickering due to a variation in the reactive power generated from a DC arc furnace connected by an AC/DC converter to an AC power system, comprises: a current detector for detecting a DC current flowi... | 10/13/1992 |
| 5138630 | Direct current electric arc furnace A direct current electric arc furnace comprises a main body, a moving electrode attached at the center of a roof of the furnace which generates an arc under the moving electrode, a bottom electrode attached at the center of the bottom, conductors which ar... | 08/11/1992 |
| 5138629 | Direct current electric arc furnace The invention provides a direct current electric arc furnace which is composed of a feeding system of direct current to the furnace, a movable electrode at the roof of the furnace, and a bottom electrode attached to the bottom of the furnace at the positi... | 08/11/1992 |
| 5115447 | Arc furnace electrode control System for controlling the positions of each of the three electrodes of a three phase electric furnace to maintain optimum real power delivered to the furnace in the event of electrode short circuiting or arc extinction due to scrap movement in the furnac... | 05/19/1992 |
| 5081640 | Method of controlling a temperature of a molten metal A method of controlling the course over time of a target temperature of a molten metal in a ladle, for example, in which the required heating power is produced by at least one plasma torch. Determination is made of the variation with time of a target temp... | 01/14/1992 |
