| 摘要 |
An automatic balancing system of a spindle motor is provided to suppress the vibration of the spindle motor by moving balls from a lower cover of a turntable to an opposite direction of eccentricity. A turntable(150) includes a table(151) on which a disk is loaded, an external sidewall(153) having a gradient, and an internal sidewall(155) extended from a bottom face of the table to a bottom side. A lower cover(160) is coupled with the external sidewall and a bottom face of the internal sidewall. A plurality of balls(170) are provided in a space which is formed by the external sidewall, the internal sidewall, and the lower cover. The lower cover includes a supporting plate(161) for supporting the balls, a first side plate(163) for supporting the balls in a rotating state of the turntable, and a second side plate coupled with the table.
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