Abstract: A system and device for providing AC signal. The system includes: an AC generator that outputs an AC output signal and includes an AC rotor that communicates with a shaft that is rotated at a rotation speed; a speed sensor for sensing the rotation speed; and a controller for controlling a magnetic field of the AC generator in response to the rotation speed; wherein the controller comprises a Field Exciter for providing a current to the AC generator so as to control the magnetic field of the AC generator.

Abstract: A device, system and method for self orientation determining a current location, based on measurement of the location of at least one random landscape object, such as any type of landscape feature.

Abstract: A system and device for providing AC signal. The system includes: an AC generator that outputs an AC output signal and includes an AC rotor that communicates with a shaft that is rotated at a rotation speed; a speed sensor for sensing the rotation speed; and a controller for controlling a magnetic field of the AC generator in response to the rotation speed; wherein the controller comprises a Field Exciter for providing a current to the AC generator so as to control the magnetic field of the AC generator.

Abstract: An apparatus (10) and a method for reducing inclusions, shrinkage blowholes, porosity and segregation in metal castings during the casting process, and for improving the grain structure, mechanical properties and yield of ingots and other castings. The apparatus (10) comprises: At least one electrode (14) for forming a moving electric arc (16) over the upper surface (18) of a metallic casting (12) being cast and a stand (20) for suspending the electric arc electrode (14) over the upper surface (18) of the metallic casting (12) during or after pouring and a second electrode (24) attachable to a metallic surface (26) of the mold (28) being used for casting, for completion of an electric circuit (30) including the electric arc (16) and electronic controls (32) connected between the apparatus (10) and a power supply (34).

Abstract: An apparatus (10) and a method for reducing inclusions, shrinkage blowholes, porosity and segregation in metal castings during the casting process, and for improving the grain structure, mechanical properties and yield of ingots and other castings. The apparatus (10) comprises: At least one electrode (14) for forming a moving electric arc (16) over the upper surface (18) of a metallic casting (12) being cast and a stand (20) for suspending the electric arc electrode (14) over the upper surface (18) of the metallic casting (12) during or after pouring and a second electrode (24) attachable to a metallic surface (26) of the mold (28) being used for casting, for completion of an electric circuit (30) including the electric arc (16) and electronic controls (32) connected between the apparatus (10) and a power supply (34).

Abstract: A method and apparatus for stirring and treating continuous and semi-continuous casting of metallic rods (12). The apparatus comprising: a stand (30) for suspending at least one electric arc electrode (24) over the upper surface of a metallic casting (14) after or during pouring, at least one electrode (24) for forming a moving electric arc (38) over the upper surface of the mettalic casting being cast, a second electrode, being the liquid metal (14), for completion of an electric circuit including said electric arc (38) and the liquid metal (14); and control means (34), connected between said apparatus and a power supply (36) and arranged to supply power to the plasma arc electrodes (14, 24), for monitoring the parameters of the electric arc (38). The invention also provides a method for casting the metallic rods (12) by using the above described apparatus.

Abstract: The invention invention provides an apparatus (10) and a method for reducing the volume of risers, and for the possibility of reducing shrinkage blowhole and porosity in shaped gravity casting. The invention provides an apparatus (10) for producing metal flow/stir in the liquid metal (31), the apparatus (10) comprising at least one electrode (16) for forming a continuously-moving plasma arc (34) over the upper surface of selected riser(s) (12) in metallic casting being cast, a stand (26) for suspending said plasma arc electrode (16) over the upper surface of said risers (12) during the casting process, a second electrode (28) attachable to the liquid metal (31) or the metal being used for casting and a power supply (36) for completion of an electric circuit including said plasma arc (34); and control means (38) connected between said apparatus (10) and said power supply (36).