Patent ID: 7307399

Claim:
A system for power transmission in an dragline-mining machine, said system comprising: a first plurality of Active Front End units adapted to be electrically coupled to a first direct current (DC) bus, each of said first plurality of Active Front End units adapted to be electrically coupled to a predetermined distinct winding from a plurality of windings of a first transformer, each of said first plurality of Active Front End units adapted to convert alternating current (AC) to DC, each of said first plurality of Active Front End units adapted to supply DC to said first DC bus, said first DC bus adapted to be electrically coupled to a first plurality of inverters, said first plurality of inverters adapted to be electrically coupled to a synchronous AC motor; and a second plurality of Active Front End units adapted to be electrically coupled to a second direct current (DC) bus, each of said second plurality of Active Front End units adapted to be electrically coupled to a predetermined distinct winding from a plurality of windings of a second transformer, each of said second plurality of Active Front End units adapted to convert alternating current (AC) to DC, each of said second plurality of Active Front End units adapted to supply DC to said second DC bus, said second DC bus adapted to be electrically coupled to a second plurality of inverters, said second plurality of inverters adapted to be electrically coupled to said synchronous AC motor.