Patent ID: 6998742

Claim:
An axial-air-gap brushless vibration motor, comprising: a stator having air-core armature coils and a shaft disposed thereon efining an axis of the motor; an eccentric rotor having a magnet attached thereto and rotatably supported by the shaft on the stator; and said eccentric rotor including: a rotor yoke formed of a thin magnetic metal sheet having a first side and a second side and comprising a flat annular portion, a first axially extending portion on an outer periphery of the flat annular portion, a flange on an inner diameter side of the flat annular portion, and a second axially extending portion connected at a first axial end thereof to an inner periphery of said flat annular portion and at a second axial end thereof to said flange to form a stepped flange structure; a disk ring-shaped axial-air-gap magnet having a plurality of magnetized magnetic poles attached to the rotor yoke on the first side on said flat annular portion and an inner periphery of said first axially extending portion; an arched eccentric weight attached to an outer periphery of said first axially extending portion; a cylindrical bearing attached to said rotor yoke on the second side on said flange radially inward of said second axially extending portion; and said eccentric rotor being rotatably supported on the shaft of the stator via said cylindrical bearing attached to said flange portion.