Patent ID: 7224095

Claim:
A motor comprising: a fixed portion including a stator, the stator including at least one winding and at least one pole plate, said at least one pole plate extending to form a plurality of pole faces, with a gap being defined between a pair of the pole faces adjacent to each other, said at least one winding being electrically energized and said energized winding magnetically inducting said pole faces for creating alternating magnetic fields; a rotor including a shaft and an annular magnet, the shaft rotatably extending through the fixed portion, the annular magnet being mounted to an inner periphery of the rotor and facing said pole faces of the stator; and at least one balancing plate mounted on the fixed portion, said at least one balancing plate including at least two magnetically conductive faces that are respectively aligned with the gaps of the stator and that are spaced from each other, each said magnetically conductive face having a length not smaller than that of an associated one of the gaps such that no portion of the magnetically conductive face is inserted into the respective gaps, said pole faces facing at least one face of the annular magnet; wherein when the rotor turns, a magnetic field of the annular magnet of the rotor magnetically actuates the alternating magnetic fields created by the stator, and is further attracted to said at least two magnetically conductive faces for inductive cooperation therewith to thereby maintain rotational balance of the rotor.