Electric machine having a stator winding with rigid bars, and related method of construction

An electric machine includes a stator having a magnetic core crossed longitudinally by a stator slot and stator winding having a phase and series of rigid, U-shaped bars inserted through the slot. The slot defines "entry" and "exit" sides in which cusps and legs of the bars are placed. The legs coming out the "exit" side are twisted through relative double folds each of which defines internal and external folds in opposite directions. Ends of the legs are electrically connected to each other to form electrical paths of the winding. A width of the cusps is identical for the bars. The ends of a pair in a part of the winding are initially not adjacent to each other and folded toward each other to be arranged parallel to each other in a circumferential direction so that the ends touch each other to allow an electrical connection between the ends.