Patent ID: 6630759
Filing Date: 2003-10-07
Classification: H02K,Y10S

Abstract:
An eccentric rotor comprising:a printed wiring commutator base member having opposed first and second surfaces, a shaft installation hole in the printed wire commutator base member, and a plurality of segment patterns arranged around the shaft installation hole on the first surface; a bearing holder made of resin, including a bearing portion extending through the hole in the printed wire commutator base member, portions of the bearing holder being disposed on each of the first and second sides of the commutator base member; an air-core armature coil position determination guide located at the printed wiring commutator base member farther from the hole in the printed wiring commutator base member than the bearing holder; two air-core armature coils located on the second surface and positioned by the air-core armature coil position determination guide, eccentrically disposed relative to the hole in the printed wiring commutator base member, each air-core armature coil having first and second ends for electrical connection of the coil; end connection portions located at a part of the second surface and to which the first and second ends are connected at positions outside and spaced from perimeters of the air-core armature coils, the first and second surfaces extending at least to the perimeters of the air-core armature coils; and an eccentric weight comprising a resin and a metal and having a specific gravity exceeding 3, extending in a radial direction relative to the hole in the printed wiring commutator base member, between the two air-core armature coils, integral with the bearing holder, and located on the printed wiring commutator base member.