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| Number | Title | Issue Date |
| 8077754 | Pool power control in remelting systems An apparatus for and method of controlling a remelting furnace comprising adjusting current supplied to an electrode based upon a predetermined pool power reference value and adjusting the electrode drive speed based upon the predetermined pool power reference value... | 12/13/2011 |
| 7991039 | Electric arc furnace monitoring system and method A system and method for monitoring the operating parameters of an electric arc furnace having a primary electrical circuit comprising a primary current transformer. The method includes monitoring the furnace's primary current transformer; collecting data therefrom; ... | 08/02/2011 |
| 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 |
| 7295593 | System and method of minimizing loss of electrical conduction during input of feed material to a furnace The described methods and systems may be applied to electric arc furnace installations. In this context, the method and system provide an electrode position controller coupled to the feed rate controller so as to predictively anticipate the introduction of new sourc... | 11/13/2007 |
| 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 |
| 7256511 | Turbine-generator equipment and installation method thereof Installation method of turbine-generator equipment controlling a turbine-generator is described. The method includes manufacturing a thyristor excitation equipment as a package including a circuit breaker, an excitation transformer, a power rectifier coupled with th... | 08/14/2007 |
| 7212562 | System and method for controlling total electrical power across multiple furnaces using electrode positioning A method and system for stabilizing energy consumption in multiple loads, or in single multi-phase loads. A central controller monitors variable reactances in the loads and identifies situations of power and/or current fluctuation and/or unbalance. The central contr... | 05/01/2007 |
| 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 |
| 6956188 | Induction heating coil with integrated resonant capacitor and method of fabrication thereof, and induction heating system employing the same An induction heating coil with integrated resonant capacitor is provided, along with methods of fabrication thereof, and induction heating systems employing the same. The induction heating coil includes a cable having a first conductor and a second conductor separat... | 10/18/2005 |
| 6937455 | Spark management method and device A spark management device includes a high voltage power source and a detector configured to monitor a parameter of an electric current provided to a load device. In response to the parameter, a pre-spark condition is identified. A switching circuit is responsive to ... | 08/30/2005 |
| 6758902 | Heater arrangement for crystal growth furnace A furnace for growing a high volume of crystals includes a plurality of individual growth stations and first and second heater matrixes. Each individual growth station has a crucible and an insulating container generally surrounding the crucible and thermally isolat... | 07/06/2004 |
| 6687284 | Method and apparatus to facilitate restriking in an arc-furnace To re-ignite efficiently an arc-furnace arc extending between an electrode and a material to be melt, a second energy supply is provided to maintain a plasma link between the electrode and the melting material when the arc-furnace arc is interrupted The e... | 02/03/2004 |
| 6608857 | Method of controlling the output voltage of a furnace A new control method is used to regulate the reactive power consumption of an electric arc furnace. Active and reactive power values are used space vector variables and serve as control parameter of the power source, which consists of a furnace transforme... | 08/19/2003 |
| 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 |
| 6421366 | Method and device for supplying an electric arc melting furnace with current The invention pertains to a process and to a device for supplying current to an electric-arc melting unit for melting and heating metal, especially steel, with a three-phase a.c. source, which sends the current via devices for producing direct current or ... | 07/16/2002 |
| 6226313 | Power source circuit and its control for three-phase electric arc furnace to reduce flicker A power source for an arc furnace having an intermediate circuit transformer including a magnetic decoupled booster transformer and an AC main-driven converter. Such a power source comprises a current controller and a zero voltage switch. The current cont... | 05/01/2001 |
| 6211495 | Temperature control system for a thermal reactor A temperature control system for a thermal reactor is disclosed that addresses many of the problems in the art. In accordance with one aspect of the disclosed control system, a plurality of temperature controllers are employed. Each temperature controller... | 04/03/2001 |
| 6157666 | Controlled current feed device for electric arc furnace Controlled current feed device for electric arc furnace employed to melt metals, wherein the feed line comprises at least a medium tension bar (13), a feed control device and a transformer (17) serving the furnace, the feed control device (16) being arran... | 12/05/2000 |
| 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 |
| 6104744 | Regulation or control of a fusion process in a three-phase current arc furnace A method for regulation or control of the melting process in a three-phase arc furnace having at least three electrodes whose height is adjustable individually and independently of one another. Each phase of the three-phase current which feeds the three-p... | 08/15/2000 |
| 6064687 | Mobile furnace facility The present invention is a multi-faceted mobile furnace apparatus. The apparatus has a furnace system, an electrical system, a positioning system and a control unit. The furnace system has a set of movable electrodes, and at least two pour configurations,... | 05/16/2000 |
| 5987052 | Method to control the power supply for electric arc furnaces Method to control the power supply for electric arc furnaces, whether they be fed with AC or DC, the furnaces including a melting cycle which includes the loading of the scrap carried out at time T0, an initial step of pre-melting the scrap wit... | 11/16/1999 |
| 5870423 | Individual heating element power control for a furnace During a heating process in a three-phase, electric furnace, power can be controlled by dividing the heating process into intervals and then controlling the average power generated during each of these intervals, and by individually controlling the power ... | 02/09/1999 |
| 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 |
| 5677925 | Power converter device for direct current power supply to an electric arc furnace A power converter device for supplying direct current to an electric arc furnace comprises at least one transformer with its primary fed with a three-phase alternating current and delivering to at least one secondary a three-phase current applied to a rec... | 10/14/1997 |
| 5617447 | Method of stabilizing a power supply network against reactive load fluctuations, and a reactive power compensation device When operating, DC arc furnaces generate undesired reactive load fluctuations which are compensated without special compensation reactance by a reactive power controller. As compensation reactance, use is made of inductors, which are always present and vi... | 04/01/1997 |
| 5610937 | Regulation method for a DC arc furnace In operation, DC arc furnaces produce reactive load fluctuations which lead to undesirable flickering phenomena especially in a frequency range from 2 Hz-20 Hz. In order to reduce these flickering phenomena, comparatively fast reactive power regulation is... | 03/11/1997 |
| 5593608 | Temperature control method and apparatus for use in thermal processing equipment A method for controlling temperature in thermal processing equipment having a processing chamber containing members to be processed. The method comprises the steps of heating a plurality of zones of the processing chamber by heaters provided in the zones,... | 01/14/1997 |
| 5583883 | Electric arc-furnace stabilization using voltage pulse injection An arc furnace (1) has an electrode (13) and connection members (14) for connection to a power-supply network (20) for supplying an arc (16) at the electrode with current. The furnace is provided with a voltage-pulse generating member (3) adapted, in conn... | 12/10/1996 |
| 5504306 | Microprocessor controlled tankless water heater system The present invention is an apparatus for controlling a water delivery system utilizing an instant flow tankless water heater. It includes a programmable microprocessor with support circuitry to achieve control of the outlet temperature of a varying flow ... | 04/02/1996 |
| 5463653 | Power converter device for direct current power supply to an electric arc furnace A power converter device for supplying direct current to an electric arc furnace comprises at least one transformer with its primary fed with a three-phase alternating current and delivering to at least one secondary a three-phase current applied to a rec... | 10/31/1995 |
| 5438588 | Direct current-electric arc furnace system The direct current-electric arc furnace system includes a furnace vessel 8, one or more electric arc electrode 7 connected as a cathode, a bottom contact 12 connected as an anode, a furnace transformer 2 and a rectifier assembly 5 for feeding the furnace,... | 08/01/1995 |
| 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 |
| 5317591 | Direct-current arc furnace In a direct-current arc furnace having a bottom contact (3) which has a large area, electromagnetically produced bath agitations are influenced by an electromagnet (9) disposed underneath the vessel bottom (4) such that the natural flow in the melt bath, ... | 05/31/1994 |
| 5292109 | Device for coupling the current feed to a metallurgical vessel A device for coupling a flexible current feed (50) to a bottom electrode of a metallurgical vessel (10) having a first electrical coupling (20), including a second electrical coupling (30) for operatively engaging the first coupling (20), being connected ... | 03/08/1994 |
| 5274663 | Direct-current arc furnace plant In direct-current arc furnace the arc is deflected in a direction away from the current supply means (19) through the action of the high-current lines (18) extending under the furnace vessel. This leads to the thermal overloading of a part of the furnace ... | 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 |
