Abstract: Stator for a rotary electric machine and having: a magnetic core axially crossed by a plurality of slots; a stator winding comprising a plurality of bars which are arranged inside the slots; a plurality of cooling channels which, in use, are flown through by a cooling fluid and are obtained inside the slots between the bars of the stator winding; and a plurality of covering elements, each of which consists of an electrically insulating plastic material, engages, without clearance, a corresponding slot on all sides of the slot, and centrally has a cavity wherein a series of corresponding bars are arranged and wherein the cooling channels are obtained.

Abstract: A method for building a magnetic core including laminations bound into packs for an electrical machine comprises steps of: stacking a group of laminations one on top of the other to build the core; binding into a pack the group building the core by locking members that axially compress the group with a predetermined clamping force; pre-compressing, before clamping the pack by the locking members, the group by a pre-compression press that is independent and separate from the locking members; measuring an axial length of the group while the group is being compressed by the pre-compression press; initially forming the group with a normally lacking number of laminations to initially have the measured length that is lower than or substantially equal to a desired length; and adding, after having completed pre-compression, an additional number of laminations to the group determined according to a difference between the desired and measured lengths.

Abstract: 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.

Abstract: A method for building a magnetic core including laminations bound into packs for an electrical machine comprises steps of: stacking a group of laminations one on top of the other to build the core; binding into a pack the group building the core by locking members that axially compress the group with a predetermined clamping force; pre-compressing, before clamping the pack by the locking members, the group by a pre-compression press that is independent and separate from the locking members; measuring an axial length of the group while the group is being compressed by the pre-compression press; initially forming the group with a normally lacking number of laminations to initially have the measured length that is lower than or substantially equal to a desired length; and adding, after having completed pre-compression, an additional number of laminations to the group determined according to a difference between the desired and measured lengths.

Abstract: 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.