Patent ID: 6897579

Claim:
A motor comprising: a rotor having at least one flat surface divided in a rotational direction and alternately magnetized to opposite poles; a coil opposing one of an inner peripheral surface and an outer peripheral surface of said rotor, wherein a central position of the coil matches that of said rotor; first magnetic pole portions opposing the one flat surface of said rotor, formed from a plurality of teeth extending in a radial direction of said rotor, and excited by said coil; second magnetic pole portions formed on an opposite side of said rotor relative to said first magnetic pole portions at positions opposing said first magnetic pole portions; and alignment portions which hold a center of a pole of said rotor at a position shifted from a line which connects a center of said first magnetic pole portions and a center of rotation of said rotor when said coil is not energized, wherein said alignment portions are formed from a plurality of teeth extending in the radial direction of said rotor to be flush with said first magnetic pole portions.