Patent ID: 7750776

Claim:
A 4-pole motor anisotropic bonded magnet, wherein: the magnet has a hollow cylindrical shape and a maximum energy product greater than 14 MGOe, formed by molding anisotropic rare-earth magnet powders with resin, wherein, in a cross section perpendicular to an axis of the anisotropic bonded magnet having a main region of a magnetic pole and a transition region in which a direction of the magnetic pole changes, an alignment direction of the anisotropic rare-earth magnet powders is normal to a lateral side of the hollow cylindrical shape in the main region, and the alignment direction gradually points from a normal direction towards a direction tangential to a periphery of the lateral side of the hollow cylindrical shape approaching to a neutral point of the magnetic pole in the transition region, and the alignment direction becomes a direction tangential to the periphery of the lateral side of the hollow cylindrical shape at the neutral point in the transition region, and the alignment direction gradually points from a tangential direction toward a direction normal to the lateral side of the hollow cylindrical shape going away from the neutral point in the transition region, and wherein the anisotropic rare-earth magnet powders align an entirety of the transition region at the degree of alignment greater than 95%, and the 4-pole motor anisotropic bonded magnet in which the alignment direction is formed is magnetized in the alignment direction.