Patent ID: 8371021

Claim:
A method of manufacturing a rare-earth/iron-based ring magnet, anisotropy of which is controlled in a continuous direction, the method comprising: a first step of, when an angle between a direction of a uniform external magnetic field Hex and an inner/outer circumferential tangent line corresponding to an arbitrary mechanical angle φ of a rotor is Hθ, molding segments having inner/outer circumferential sections, which change the angle Hθ corresponding to the mechanical angle φ, in a magnetic field according to the external magnetic field Hex; and a second step of arranging a plurality of segments on a circumference according to a number of poles, extruding the segments in a ring shape using rheology based on viscous deformation of the segments from one thrust-direction end surface of the segments, and compression molding the segments from both thrust-direction end surfaces so as to control anisotropy in the continuous direction.