Patent ID: 6979926

Claim:
A sequentially joined-segment stator coil of a rotary electric machine comprising: a stator core having opposed ends and slots formed at given intervals in a circumferential direction of the stator core; and a plurality of conductor segments each including a head portion, a pair of slot-inserted portions, and a pair of end portions, each of the head portions having one of substantially U- and V-shapes, extending in a circumferential direction of said stator core at one of the ends of said stator core, the head portions of the conductor segments defining a segment head-side coil end of the stator coil, the slot-inserted conductor portions of each pair continuing from ends of one of the head portions, inserted into two of the slots formed in said stator core, six of the slot-inserted conductor portions being arrayed in line in a radius direction of said stator core within each of the slots of said stator core, the end portions projecting from the slot-inserted conductor portions outside the other end of said stator core in the axial direction thereof, extending substantially in the circumferential direction of said stator core, the end portions defining a segment end-side coil end of the stator coil, wherein said conductor segments are connected at least through joints each provided between two of tips of the end portions, and wherein said segment head-side coil end includes the head portions which lead to the first and fourth slot-inserted conductor portions as counted from a radial inside of said stator core and have a larger size, the head portions which lead to the second and third slot-inserted conductor portions and have a smaller size, and the head portions which lead to the fifth and sixth slot-inserted conductor portions and have a smaller size.