METHOD FOR MANUFACTURING RING-SHAPED MAGNET

PROBLEM TO BE SOLVED: To provide a method or the like for manufacturing a ring-shaped magnet capable of obtaining a long-sized ring-shaped magnet having the excellent degree of orientation in the peripheral direction and the axial direction and the superior uniformity of Br and capable of remarkably improving a productive efficiency and an economical efficiency. SOLUTION: A magnetization process magnetically orientes magnetic powder M housed in a mold 20 partitioning a cylindrical cavity. In the magnetization process, a magnetic orientation is conducted by using mutually adjacent magnetic pole sections 6b and 6c in six magnetic pole sections 6a to 6f in one poles having the same polarity first and using the magnetic pole sections 6e and 6f oppositely arranged to these magnetic pole sections 6b and 6c at 180° as the other poles having a reverse polarity. The combinations of each magnetic pole section of one poles and the other poles are changed next, concretely, one poles are configured from the magnetic pole sections 6d and 6e, the other poles are configured from the magnetic pole sections 6a and 6b and the magnetic orientation is conducted. COPYRIGHT: (C)2009,JPO&INPIT