Toroidal hand-held autotransformer assembly

A method of forming a hand-held fluid-cooled toroidal autotransformer assembly, the method comprising:

• arranging a plurality of radially spaced apart longitudinally-oriented, electrically conductive concentric pipes around a longitudinally-oriented axis of symmetry of a toroidal magnetic core in an autotransformer enclosure;
• physically and electrically interconnecting the plurality of radially spaced apart longitudinally-oriented, electrically conductive concentric pipes in series at the opposing ends of each of the plurality of radially spaced apart longitudinally-oriented, electrically conductive concentric pipes to form an autotransformer circuit;
• providing a first electric power supply terminal and a second electric power supply on the autotransformer enclosure and connecting the first and the second electric power supply terminals to the autotransformer circuit;
• serial interconnecting a longitudinally-oriented cooling fluid passage between each of an adjacent one of the plurality of radially spaced apart longitudinally-oriented, electrically conductive concentric pipes to form a serial autotransformer cooling fluid passage;
• providing a cooling fluid supply terminal and a cooling fluid return terminal on the autotransformer enclosure;
• and
• connecting the cooling fluid supply terminal to a first end of the serial autotransformer cooling fluid passage and the cooling fluid return terminal to a second end of the serial autotransformer cooling fluid passage.

A hand-held fluid-cooled toroidal autotransformer assembly comprising:

• an autotransformer enclosure;
• a toroidal magnetic core having a longitudinally-oriented axis of symmetry centrally disposed within the autotransformer enclosure;
• a plurality of longitudinally-oriented, electrically conductive concentric pipes physically and electrically interconnected in series around the longitudinally-oriented axis of symmetry of the toroidal magnetic core within the autotransformer enclosure to form an autotransformer circuit, the plurality of longitudinally-oriented, electrically conductive concentric pipes radially spaced apart from each other to form a longitudinally-oriented cooling fluid passage between each adjacent concentric pipes of the plurality of longitudinally-oriented, electrically conductive concentric pipes, the plurality of longitudinally-oriented, electrically conductive concentric pipes comprising a radially outer array of longitudinally-oriented, electrically conductive concentric pipes and a radially inner array of longitudinally-oriented, electrically conductive concentric pipes, the radially outer array of longitudinally-oriented, electrically conductive concentric pipes disposed radially further away from the longitudinally-oriented axis of symmetry of the toroidal magnetic core than the radially inner array of longitudinally-oriented, electrically conductive concentric pipes, the plurality of the radially outer array of longitudinally-oriented, electrically conductive concentric pipes disposed around the outer perimeter of the toroidal magnetic core and the radially inner array of longitudinally-oriented, electrically conductive concentric pipes disposed within the inner axial opening of the toroidal magnetic core;
• a first electric power supply terminal and a second electric power supply terminal disposed on an exterior of the autotransformer enclosure, the first electric power supply terminal and the second electric power supply terminal configured for connection of the autotransformer circuit to an alternating current power source;
• a first electric load terminal and a second electric load terminal disposed on the exterior of the autotransformer enclosure, the first electric load terminal and the second electric load terminal configured for connection of the autotransformer circuit to an induction work coil circuit;
• a serial autotransformer cooling fluid passage formed from all of the longitudinally-oriented cooling fluid passages connected in series, the serial autotransformer cooling fluid passage having a first end and a second end, the first end comprising a cooling fluid supply terminal disposed on the exterior of the autotransformer enclosure, the cooling fluid supply terminal configured for connection of the serial autotransformer cooling fluid passage to a cooling fluid source, the second end comprising a cooling fluid return terminal disposed on the exterior of the autotransformer enclosure, the cooling fluid return terminal configured for connection of the serial autotransformer cooling fluid passage to the cooling fluid source;
• and
• an induction work coil circuit cooling fluid supply terminal and an induction work coil cooling fluid return terminal, the induction work coil circuit cooling fluid supply terminal and the induction work coil cooling fluid return terminal disposed on the exterior of the autotransformer enclosure, the induction work coil circuit cooling fluid supply terminal and the induction work coil cooling fluid return terminal in fluid communication with the serial autotransformer cooling fluid passage.