Rotating electrical machine and stator thereof

A stator of a rotating electric machine, the stator including:

• a cylindrical stator core formed by stacking, in an axial direction, electromagnetic steel plates arranged to surround an outer circumference of a rotor, the cylindrical stator core comprising a plurality of stator core blocks aligned with each other in an axial direction;
• stator coils contained in a plurality of slots that are spaced apart along an inner circumference surface of the stator core;
• a plurality of wedges that extend in the axial direction and are inserted into opening portions of the slots in the axial direction and arranged side by side so that the stator coils latch into the slots to remain therein;
• and
• a plurality of inner spacers that are positioned between adjacent stator core blocks of the plurality of stator core blocks so as to be sandwiched between the adjacent stator core blocks, extend radially, and are arranged so as to be spaced apart in a circumferential direction such that ventilation ducts through which cooling gas flows are formed, radially, wherein:
• at least two wedges among a plurality of the wedges are adjacent to each other in the axial direction,
• shoulder portions of the at least two wedges are partially cut to form notches such that the circumferential-direction width of the shoulder portions of the at least two wedges in the circumferential direction, on a rotation direction leading side and a rotation direction delaying side of each of the stator coils at locations corresponding to the ventilation ducts, is substantially equal to the width of the slots,
• each of the at least two wedges that are adjacent to each other in the axial direction has a plurality of notches, and
• a chamfered portion is formed at a corner portion of a wedge positioned at an inner side of the stator core.