| 摘要 |
PURPOSE:To simplify a structure, to effectively utilize a space and to reduce the cost by providing a cylindrical shielding plate on the outer periphery of a ring- shaped rotor magnet and providing a nonmagnetic plate on the bottom of the magnet. CONSTITUTION:A rotor is made of a ring-shaped magnet 17, a magnetic cylinder 18 and a nonmagnetic plate 19. A hole 21 having the same inner diameter as that of the magnet 17 is opened at the plate 19, and a mounting hole 20 is formed at the outside from the diameter of the ring. When the magnet is formed of a resin magnet molding, the hole 21 of the plate 19 is passed through the core of the mold disposed in the bore of the magnet, thereby facilitating the insert molding of the plate 19. |
