Patent ID: 7221069
Filing Date: 2007-05-22
Classification: H02K

Abstract:
1. 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 at least two pole faces, each of said at least two pole faces including a strong magnetic section and a weak magnetic section, said at least one winding being energizable to make the strong magnetic sections and the weak magnetic sections create stronger alternating magnetic fields and weaker alternating magnetic fields respectively; 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 at least two pole faces of the stator; and at least one magnetically conductive balancing portion mounted on the fixed portion, said at least one magnetically conductive balancing portion including at least two magnetically conductive faces that are respectively aligned with the weak magnetic sections of said at least two magnetic pole faces of the stator and that face at least one face of the annular magnet; wherein when the rotor turns, the annular magnet of the rotor induces the stronger alternating magnetic fields and the weaker alternating magnetic fields respectively created by the strong magnetic sections and the weak magnetic sections of the stator and attracts the magnetically conductive faces facing the weak magnetic sections to thereby maintain starting stability and rotational balance of the rotor.