Patent ID: 8264115
Filing Date: 2012-09-11
Classification: H02K

Abstract:
1. A stator for an electric rotating machine, the stator comprising: a hollow cylindrical stator core having a longitudinal axis and a plurality of slots that are formed in a radially inner surface of the stator core and spaced in a circumferential direction of the stator core; and a stator coil comprised of a plurality of electric wires that are mounted on the stator core so as to be offset from one another in the circumferential direction of the stator core, wherein each of the electric wires has first, second, . . . , and nth in-slot portions and first, second, . . . , and (n−1)th turn portions, where n is an integer not less than 4, the first to the nth in-slot portions are sequentially received in p of the slots of the stator core, where p is an integer not greater than n, the first to the (n−1)th turn portions are alternately located on opposite axial sides of the stator core outside the slots to connect corresponding adjacent pairs of the first to the nth in-slot portions, and radial distances from the axis of the stator core to the first to the nth in-slot portions successively decrease, and wherein each of the electric wires further includes a plurality of bulges, each of the bulges being formed, on a surface of a corresponding one of the in-slot portions of the electric wire 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 of the stator core.