Patent ID: 7164216

Claim:
A motor comprising: a stator section with a two-phase structure having first and second stator assemblies; and a rotor section including a rotation shaft, and first and second permanent magnets that are disposed opposite to the first and second stator assemblies, respectively, and affixed to the rotation shaft with a gap provided between the first and second permanent magnets in an axial direction of the rotation shaft, wherein at least one of the first and second permanent magnets has an effective section at an outer circumference thereof having multiple poles alternately magnetized with N poles and S poles, and a protruded section that has a diameter smaller than an outer diameter of the effective section and protrudes in the axial direction, and wherein the at least one of the first and second permanent magnets includes an inner end face that is opposite to the other of the first and second permanent magnets in the axial direction, and the effective section of at least one of the first and second permanent magnets terminates at the inner end face, and the protruded section protrudes from the inner end face in the axial direction.