Patent ID: 8513851

Claim:
A stator comprising: a pair of insulators, each insulator including an annular section; a plurality of tooth sections extending radially inward of a radially inner circumferential surface of the annular section and being circumferentially arranged about the annular section, and a plurality of connecting sections connecting the radially inner circumferential surface of the annular section to ends of the tooth sections, each connecting section having a first surface configured to face an end surface of a stator core and a second surface facing in a direction opposite to the first surface, the second surface of each connecting section including a circumferential planar portion extending circumferentially from the end of the corresponding one of the tooth sections, and a radial planar portion extending radially from the end of the corresponding one of the tooth sections, and the annular section having a projecting portion extending in the axial direction thereof in a position abutting the second surface of at least one of the connecting sections, the projecting portion entirely delimiting the at least one connecting section on a radially outer side thereof; a stator core, with the insulators disposed facing respective opposite end surfaces of the stator core that are located in an axial direction of the stator core; and a coil wound around the stator core and the insulators, the stator core including a back yoke section and a plurality of tooth sections protruding radially inward of an inner circumferential surface of the back yoke section and circumferentially arranged about the back yoke section, the tooth sections of the insulators being disposed in locations corresponding to locations of the tooth sections of the stator core, and each connecting section of each of the insulators having an inner surface that roughly coincides with an inner surface of the back yoke section of the stator core, as seen from the axial direction of the stator core, the back yoke section of the stator core including a plurality of first cutout surfaces formed in an outer periphery thereof that is radially outward of the tooth sections of the stator core, with each cutout surface being formed along the axial direction of the stator core, and a plurality of second cutout surfaces formed in an inner periphery thereof that is radially outward of the tooth sections of the stator core, and the inner surfaces of the connecting sections of the insulators roughly coinciding with the second cutout surfaces of the back yoke section of the stator core, as seen from the axial direction of the stator core.