| 摘要 |
A stator includes a hollow cylindrical stator core and a stator coil comprised of electric wires. Each of the electric wires has n in-slot portions and (n−1) turn portions, where n≧4. The in-slot portions are sequentially received in p slots of the stator core, where p≧n. The turn portions are located outside the slots to connect adjacent pairs of the in-slot portions. The radial distances from the longitudinal axis of the stator core to the first to the nth in-slot portions successively decrease. Each of the electric wires further includes bulges. Each of the bulges is formed, on a surface of a corresponding one of the in-slot portions or a surface of a portion of the electric wire which falls on an imaginary line extending axially from the corresponding in-slot portion, so as to protrude from the corresponding in-slot portion in a radial direction. |
