Patent ID: 8866425

Claim:
A system for driving mechanisms in narrow remote locations, like downhole, in a well ( 40 ), pipeline or a tunnel, supplied with DC voltage via a long cable ( 42 ), comprising: a power & control electronics unit ( 11 ) comprising a control system ( 13 ) operatively connected to a power line communication module ( 12 ), a DC/DC buck converter ( 15 ), and at least one of a plurality of DC/AC inverters ( 16 a - 16 b ), wherein the power line communication module is configured to deliver power from a source to the electronics unit ( 11 ) and is electrically connected to the DC/DC buck converter ( 15 ) which is electrically connected to each of the plurality of DC/AC inverters via a common DC bus ( 14 ), and an electromechanical unit ( 20 ) comprising: a plurality of electric rotating motors ( 21 a - d ) each having a shaft, said motors axially aligned and mounted mechanically in series by connecting first and second ends of said shafts by means of a coupling ( 23 ), wherein said power and control electronics unit ( 11 ) and said electromechanical unit ( 20 ) are connected by power and control cables extending between said DC/AC inverters ( 16 a - b ) and said motors ( 21 a - d ), said motors ( 21 a - d ) being divided into a plurality of groups ( 24 , 25 ) of a plurality of motors with each respective group being connected to a single DC/AC inverter ( 16 a - b ) such that each inverter ( 16 a - b ) runs at least two motors ( 21 a - d ), and windings of motors ( 21 a - d ) in each respective group ( 24 , 25 ) are connected in series such that said windings of only a single motor ( 21 a - b ) in each group is directly connected to the respective DC/AC inverter.