Electrode positioning control
AssigneeLectromelt Corporation
InventorJames R. Bello
Life of this patent
Estimating the term…
Abstract
An electrode positioning control for electric arc furnaces includes a first circuit for producing an electric error signal functionally related in magnitude and sense to the electrical parameters in the electrode. The error signal is used to control the firing angle of an electronic switching device coupled between an electrode positioning motor and its power source. In addition, a signal generator is coupled to the motor for providing a velocity feedback signal functionally related to motor speed and direction for further modulating the firing angle.
Claims13
An electric arc furnace having at lease one electrode,
- drive means for positioning said electrode relative to a furnace charge,
- an energy source coupled to said drive means for operating the same,
- error detection circuit means coupled to said electrode for generating an error signal functionally related to the magnitude of electrode current,
- electrical energy flow control means coupled to said energy source and said drive means, controller means coupled to said error detection circuit means and to flow control means, said controller means being responsive to said error signal for controlling the flow of electrical energy through said flow control means to said drive means whereby said electrode will be positioned relative to said furnace charge in accordance with electrical conditions in said electrode.
An electric arc furnace having at least one electrode,
- drive means for positioning said electrode relative to a furnace charge,
- an energy source coupled to said drive means for operating the same, said drive means being operative to raise said electrode when the magnitude of electrical energy received exceeds a predetermined value and is incapable of sustaining said electrode when the magnitude of said energy is less than a predetermined value whereby the electrode moves toward the furnace charge,
- error detection circuit means coupled to said electrode for generating an error signal functionally related in magnitude and sense to the deviations of the current and voltage in said electrode from preselected values,
- electrical energy flow control means coupled to said energy source and to said drive means, controller means coupled to said error detection circuit means and to said energy flow control means, said controller means being responsive to said error signal to control the energy delivered to said drive means in relation to the magnitude and sense of said error signal, whereby said drive means will be energized sufficiently to sustain said electrode relative to said furnace charge when said error signal is equal to a predetermined value, said energization being sufficient to elevate said electrode when said error signal deviates from said value in a first sense and said energization being insufficient to sustain said electrode when said error signal deviates from said value in a second sense.
Dependencies are inferred from the claim text.