Spindle motor rotational unbalance correction mechanism

摘要

A spindle motor rotational unbalance correction mechanism has a stand onto which the magnetic disk apparatus is placed, a mounting device for fixing the magnetic disk apparatus to the stand, and a base plate onto which the stand is placed, with an intervening resilient material therebetween. An acceleration sensor detects the vibration of the magnetic disk apparatus when it is operated. A vibrator applies a mechanical shock to the magnetic disk apparatus. A control circuit calculates from a detection signal from the acceleration sensor any shift in position of the magnetic recording medium mounted on the magnetic disk apparatus and controls the supply of electrical driving power to the vibrator in order to correct for the position shift of the magnetic recording medium, thereby providing a high-performance magnetic disk apparatus in which the position shift of the magnetic disk is corrected.