Patent ID: 8653714

Claim:
A stator for an electric rotating machine, the stator comprising: a stator core that includes an annular yoke portion, a plurality of tooth portions and a plurality of slots, each of the tooth portions extending radially inward from a radially inner periphery of the yoke portion, the tooth portions being arranged in a circumferential direction of the yoke portion at predetermined intervals, each of the slots being formed between a circumferentially-adjacent pair of the tooth portions; and a stator coil that is mounted on the stator core so as to have a plurality of in-slot portions each of which is received in a corresponding one of the slots of the stator core, wherein the tooth portions of the stator core are separately formed from and assembled to the yoke portion, the stator core further comprises a plurality of connecting portions each of which circumferentially extends to connect a corresponding circumferentially-adjacent pair of the tooth portions, each of the slots of the stator core is partitioned by a corresponding one of the connecting portions into a radially-outer section and a radially-inner section, and the stator coil is mounted on the stator core so that: in each of the radially-outer and radially-inner sections of the slots, there is received at least one of the in-slot portions of the stator coil, for each of the slots, the at least one in-slot portion received in the radially-outer section of the slot creates a first magnetic field while the at least one in-slot portion received in the radially-inner section of the slot creates a second magnetic field, and the magnitudes of the first and second magnetic fields are equal to each other, but the directions of the first and second magnetic fields are opposite to each other at the corresponding connecting portion by which the slot is partitioned.