Variable transformer and voltage control system

In a variable transformer having a movable core piece that moves past a pole face, the improvement comprising a controller for controlling the movement of said core piece so that said core piece moves at varying rates depending upon the position of said core piece with respect to said pole face.

A system for automatically controlling output voltage in a system supplied with a varying input voltage comprising a transformer supplied with said input voltage and producing said output voltage and having coils and a movable core structure, the position of said core structure determining the relation between said input and output voltages, said movable core structure including means for locking the position of said movable core structure in any position within a predetermined range, and control means responsive to variation in said output voltage for varying the position of said movable core structure to maintain said output voltage at a predetermined value, in which said transformer includes a boost coil for adding voltage and a buck coil for subtracting voltage, and said movable core structure varies the potential developed by each of said boost and buck coils, said movable core structure includes a core element movable in proximity to said boost and buck coils, and said movable core structure is moved at a rate which decreases as the gap between said core element and one of said boost and buck coils increases.

A system for automatically controlling output voltage in a system supplied with a varying input voltage comprising a transformer supplied with said input voltage and producing said output voltage and having coils and a movable core structure, the position of said core structure determining the relation between said input and output voltages, said movable core structure including means for locking the position of said movable core structure in any position within a predetermined range, and control means responsive to variation in said output voltage for varying the position of said movable core structure to maintain said output voltage at a predetermined value, in which said control means includes microprocessor means monitoring said output voltage and generating output control signals, and servo motor means coupled to said movable core structure to control the position of the latter in response to said output control signal, and said microprocessor means controls said servo motor means to move said movable core structure at a rate that varies in accordance with the position of said movable core structure with respect to said coils.

A system for automatically controlling output voltage in a system supplied with a varying input voltage comprising a transformer supplied with said input voltage and producing said output voltage and having coils and a movable core structure, the position of said core structure determining the relation between said input and output voltages, said movable core structure including means for locking the position of said movable core structure in any position within a predetermined range, and control means responsive to variation in said output voltage for varying the position of said movable core structure to maintain said output voltage at a predetermined value, in which said transformer includes a boost coil for adding voltage and a buck coil for subtracting voltage, and said movable core structure varies the potential developed by each of said boost and buck coils, said movable core structure includes a core element movable in proximity to said boost and buck coils, and said core element is movable along a line, and said control means comprises a drive member pivotable about a pivot axis, a linkage bar pivotally coupled at one end thereof to said drive member at a point spaced from said pivot axis and at another end thereof to said core element, so that arcuate movement of said one bar end about said pivot axis causes movement of said core element along said line.