Segment coil, stator including segment coil, and method of manufacturing segment coil

A segment coil in a stator of a rotating electric machine formed from an annular core and rectangular wire coils of a plurality of phases, segment coils being arranged as aligned in a radial direction in slots of the annular core and coils in adjacent slots being arranged as aligned in a circumferential direction, comprising:

• a straight portion accommodated in said slot;
• and
• a pair of coil end portions protruding outward from said slot,
• a tip end of any one coil end portion of said pair of coil end portions being defined as a tip end portion for joint including a joint surface for joint to another segment coil, and
• said tip end portion for joint being constructed such that the joint surface is in parallel to a radial direction of said annular core when viewed in an axial direction of said annular core, wherein
• said segment coil has a pair of said tip end portions for joint arranged at prescribed positions in the circumferential direction of the annular core, and the pair of tip end portions for joint are arranged such that adjacent tip end portions for joint are displaced between an inner-diameter-side and an outer-diameter-side in the radial direction of said annular core when the segment coils are arranged as aligned in the slots of said annular core,
• among the segment coils accommodated in the same slot, the segment coils adjacent in the radial direction of said annular core are joined at said tip end portions for joint, and
• said pair of tip end portions for joint are formed by twisting end portions of said pair of coil end portions by 90 degrees in the same direction.