Patent ID: 8581467

Claim:
A stator comprising: a stator core having a plurality of slots; and a cage coil formed of a rectangular combined conductor that is wound by a plurality of turns, the combined conductor including: a first conductor formed in a continuous zig-zag pattern; a second conductor formed in a continuous zig-zag pattern, the first and second conductors being combined to overlap one on the other with a displacement of one pitch; conductor in-slot portions overlapped and mounted in each of the slots of the stator core; conductor connecting portions placed circumferentially on the outside of the slots; and conductor stepped portions connecting the conductor in-slot portions and the conductor connecting portions, wherein the first conductor and the second conductor are separately provided, and wherein the cage coil includes a first-phase cage coil, a second-phase cage coil, and a third-phase cage coil that are wound on one another for applying W-phase current, V-phase current, and U-phase current respectively, and the first-phase cage coil includes a radially outward protrusion in each of the connecting portions arranged in both ends in an axial direction of the stator, the protrusions being located at both ends of each conductor in-slot portion in the axial direction, and the second-phase cage coil includes a radially outward protrusion in each of the connecting portions arranged in both ends in the axial direction of the stator, the protrusions being located at both ends of each conductor in-slot portion in the axial direction, and further includes a recess extending continuous to each protrusion and further radially outward to bypass the protrusions formed in each of the connecting portions of the first-phase cage coil.