| 摘要 |
PURPOSE:To prevent the positional displacement of the center by injection- molding a supporter, which has a section covering an uneven section radially extending and a section burying an inner circumferential section and is made of resin, to a ring-shaped rotor magnet, to the surface thereof the uneven section is formed. CONSTITUTION:A member, the center thereof has a through hole 13 and to one main surface 14 and the other main surface 15 thereof a plurality of the convex sections 16 (or the concave sections) radially extending are each shaped, is used as the rotor magnet 11, the rotor magnet 11 is entered into a die for predetermined injection molding, and the supporter 12 made of synthetic resin is integrally formed to the rotor magnet 11. Here, the supporter 12 buries the inside of the through hole 13 of the rotor magnet 11, and is shaped by a section, the center thereof has a shaft inserting hole 17, and the section covering the convex section 16. Accordingly, displacement from the central position of the shaft inserting hole 17 can be reduced because the direction of shrinkage in case of the curing of resin is forcedly directed to the center. |
