Patent ID: 7994681

Claim:
A motor comprising: a rotor; and a stator that houses the rotor in a rotatable manner, wherein one of the rotor and the stator comprises at least one permanent magnet, the other of the rotor and the stator comprises at least one core that faces the permanent magnet and a plurality of coils that excite the core, the core comprises a plurality of poles that are defined by a plurality of grooves arranged in a circumferential direction of the rotor, wherein a corresponding one of the coils is wound on each pole through the grooves, each pole of the core comprises at least one extension plate that is formed on at least one end face of the pole, and each extension plate extends parallel to a rotation axis of the rotor from the end face of the pole while facing the permanent magnet, and has a magnetic anisotropy whose axis of easy magnetization is substantially parallel to the rotation axis of the rotor.