Rotary electric machine having stator coil with U-shaped segment

A rotary electric machine comprising:

• a stator core having a plurality of slots circumferentially arranged at given intervals, a circumferential interval of adjacent slots defining a slot pitch;
• and
• a stator coil, the stator coil comprising:
• a plurality of sets of at least first and second segments each having a substantially U-shape, the second segment being larger than the first segment, each of the first and second segments being formed by a single wire conductor having opposing first and second surfaces, the single wire conductor including a pair of straight conductor portions and a turn portion continuously connecting the paired straight conductor portions, one of the paired straight portions of each of the first and second segments of each of the sets being inserted in one of the plurality of slots, the other of the paired straight portions being inserted in another one of the plurality of slots such that the second segment overlays the first segment, the turn portion of the first segment of each of the sets including a pair of slant portions configured to continuously extend from the paired straight portions, and a tip portion continuously joining the paired slant portions, the tip portion including a first crank portion, the first crank portion being configured to radially shift one of the paired slant portions from the other of the paired slant portions by a first length such that:
• the first surface of the single wire conductor, constituting one surface of each of the paired slant portions and the tip portion of the first segment, is arranged to face the stator core, and
• the second surface of the single wire conductor, constituting the other surface of each of the paired slant portions and the tip portion of the first segment, is arranged opposing the first surface,
• the turn portion of the second segment of each of the sets including a pair of slant portions configured to continuously extend from the paired straight portions thereof, and a tip portion continuously joining the paired slant portions thereof, the tip portion including a second crank portion, the second crank portion being configured to radially shift one of the paired slant portions from the other of the paired slant portions by a second length such that:
• the first surface of the single wire conductor, constituting one surface of each of the paired slant portions and the tip portion of the second segment, is arranged to face the stator core,
• the second surface of the single wire conductor, constituting the other surface of each of the paired slant portions and the tip portion of the second segment, is arranged opposing the first surface,
• the first length being substantially equivalent to a radial width of the turn portion of the first segment of each of the sets, the second length being determined to allow the second crank portion of the second segment of each of the sets to substantially overlay the first crank portion of the first segment of each of the sets, and
• wherein the first crank portion of the first segment of each of the sets has a first inclination with respect to a corresponding radial direction of the stator core and the second crank portion of the second segment of each of the sets has a second inclination with respect to a corresponding radial direction of the stator core, the first inclination being identical to the second inclination.