Patent ID: 6373154
Filing Date: 2002-04-16
Classification: F16F,G11B,Y10T

Abstract:
A spindle motor incorporating a self-compensating dynamic balancer in a disk player, comprising:a rotational shaft; a motor base having a through hole in which said rotational shaft is rotatably inserted; a stator fixedly installed at said motor base and having a yoke and a coil wound around said yoke; a rotor having a case which is fixed to an end of said rotational shaft and encloses said stator, and a magnet which is fixed inside said case to face said yoke; at least one circular race which is integrally formed concentric with said case and rotates around the center of rotation of said rotational shaft; a mobile unit located inside said race to be capable of moving; and a cover member which is coupled to an opening of said race for sealing an inner space of said race, wherein the center of gravity of said self-compensating dynamic balancer is located opposite to that of a disk with respect to said rotational shaft of said spindle motor by a centrifugal force generated during rotation of the disk by said spindle motor, thereby to compensate for vibrations due to an eccentric center of gravity of the disk.