PURPOSE: To reduce the magnetic reluctance of a magnetic path between rotor magnet and stator core to contrive the improvement of efficiency and to contrive to simplify a structure, to reduce the number of parts and to downsize an apparatus by using a stator core having an increased thickness of pole teeth and molded out of soft magnetic metal powder in one piece.
CONSTITUTION: The apparatus has a cylindrical rotor magnet 13 subjected to multipolar magnetization and a structure with coils 6 wound around respective magnetic pole parts of a stator core 4 having a plurality of magnetic pole parts 5, in which tip parts facing the inner periphery of the rotor magnet 13 become pole teeth 8; and the stator core 4 is molded out of soft magnetic metal powder in one piece so that the thickness of the pole tooth 8 is larger than that of the winding part of the magnetic pole part 5 wound by the coil 6.
SUZUKI OTOKICHI
RIYUU SO
YOMOGIDA HIROSHI
