Patent ID: 7839046

Claim:
A claw pole motor comprising: a rotatably supported rotor having a magnet arranged on an outer circumferential surface thereof; and a stator including an annular iron core arranged around the outer circumferential surface of the rotor in a facing relationship with the rotor and an annular coil received within the iron core, wherein the iron core includes a yoke portion having a generally C-like cross sectional shape and opened in an inner circumferential surface opposite to the rotor, a plurality of upper claw-shaped magnetic poles arranged along an inner circumferential surface of the annular coil and curved to extend axially downwardly from an upper inner edge of the yoke portion and a plurality of lower claw-shaped magnetic poles arranged along an inner circumferential surface of the annular coil and curved to extend axially upwardly from a lower inner edge of the yoke portion, the upper claw-shaped magnetic poles and the lower claw-shaped magnetic poles being alternately arranged along a circumferential direction of the iron core, the yoke portion having cutout portions formed outside of regions demarcated by straightly interconnecting position-corresponding boundary points of the neighboring claw-shaped magnetic poles along an outer circumferential surface of the yoke portion, and wherein the yoke portion includes a cylindrical sidewall portion covering an outer circumferential surface of the annular coil and a pair of end surface portions, the annular coil being interposed in a vertical direction between the pair of end surface portions, and the cutout portions being formed over the end surface portions and the sidewall portion.