Patent ID: 8159097

Claim:
A motor, comprising: a stator that is mounted on a substrate and on whose outer circumference a plurality of magnetic poles are arranged at a first predetermined interval; and a rotor that is rotatably disposed around the stator; wherein an inner circumferential face of the rotor is provided with a magnet, main magnetization is performed on a face of the magnet opposing the stator to have opposite polarities at a second predetermined interval in a direction opposing the stator, and FG magnetization is performed on a face of the magnet opposing the substrate to have opposite polarities at a third predetermined interval, each of outer circumferential ends of the plurality of magnetic poles of the stator is provided with a first extended portion that extends from a magnetic pole base to the substrate side, and a second extended portion that extends from the magnetic pole base to a side opposite the substrate side, a face of the substrate opposing the rotor is provided with a FG pattern including a main pattern and a cancellation pattern such that the FG pattern opposes the magnet, the FG pattern is disposed on an outer side in a radial direction of an outer circumferential face of the stator, and in a cross-section along a plane including a central axis of a driving shaft coupled to the rotor, when an angle formed by a straight line connecting a central position in the radial direction of the magnet and a central position in the radial direction of the FG pattern with respect to the central axis of the driving shaft is taken as θ (θ<90 degrees), and an angle formed by a direction of the FG magnetization with respect to the central axis of the driving shaft is taken as A (A<90 degrees), 0 degree<A≦θ is satisfied.