Patent ID: 6339275
Filing Date: 2002-01-15
Classification: G11B,H02K

Abstract:
A rotor comprising:a rotary shaft; a hub having a disk mounting surface, and a central portion from which said rotary shaft extends upright; a rotor case having a cylindrical portion and a first flange portion extending radially outward from one end of said cylindrical portion, said first flange portion being fixed to a back side of said hub opposite from said disk mounting surface, wherein said first flange portion is electrically joined to said hub; and an annular magnet fixed to an inner circumferential surface of said cylindrical portion, wherein said back side of said hub opposite from said disk mounting surface is a flat surface which extends from substantially an outer area of said center portion to an outer edge of said hub, wherein said rotor case is adjustably fixed in a radius direction with respect to the flat surface of said back side of said hub.