Patent ID: 7990011

Claim:
A rotor for an electric motor, said rotor comprising: a magnet assembly formed into a ring-shaped plate form; an inner periphery holder for holding an inner periphery of the magnet assembly; and a ring-shaped outer periphery holder for holding an outer periphery of the magnet assembly, wherein: the magnet assembly comprises: first and second main magnets having magnetization directions that face a first direction and having orientations that are opposite one another; and first and second submagnets having magnetization directions that face a second direction perpendicular to the first direction and having orientations that are opposite one another, the first and second main magnets each have a wedge-shaped planar part, and the first and second submagnets have a substantially rectangular shape; and the planar parts of the first and second main magnets and first and second submagnets form the same plane of rotation and are arrayed such that the magnetization directions of adjacent magnets are perpendicular to one another.