Patent ID: 7239057

Claim:
A single phase induction motor, comprising: a stator installed in an inner circumferential surface of a motor body, a plurality of coils being wound on the stator; a rotor rotatably installed in a center portion of the stator and provided with a rotation shaft at a center thereof; and a magnet unit freely and rotatably installed between the stator and the rotor, the magnet unit being separated from the stator by a first air gap and from the rotor by a second air gap, wherein the magnet unit comprises a back yoke and a plurality of magnets attached to an outer circumferential surface of the back yoke, said plurality of magnets substantially surrounding the entire outer circumferential surface of the back yoke; and a generally cup-shaped supporter having an open end and a closed end, wherein the open end of the supporter is integrally injection-molded to an axially-facing end of the magnet unit.