ELECTRIC MOTOR WITH BRUSH, AND MAGNETIZATION DEVICE

PROBLEM TO BE SOLVED: To reduce the noise by suppressing resonance of a driven member due to the fundamental frequency components of torque fluctuations. SOLUTION: An electric motor 10 includes: an armature 13 as a rotor, wherein each tooth 14a is provided being tilted in the peripheral direction, with respect to the axis direction of a shaft 16; and magnets 12 as a stator, wherein a magnetic pole angle is so set as to reduce cogging torque by the relation with the tooth width. A cutout 21 as a magnetic pole angle changing means is provided, at a part of both the end parts in the peripheral direction of each magnet 12 for increasing the cogging torque appearing on the shaft 16. By the increased cogging torque, the fundamental frequency components of torque fluctuations in electromagnetic force torque are reduced by the increased cogging torque. COPYRIGHT: (C)2011,JPO&INPIT