Deceleration of spindle motor in disk drive

摘要

A spindle motor of a disk drive includes a stator with windings and a rotor configured to rotate a disk of the disk drive. It is determined whether the disk drive is in a falling state while the disk rotates, and when the disk drive is in the falling state, a negative torque is applied to the rotor to reduce an angular velocity of the disk. When the angular velocity of the disk reaches a threshold angular velocity, an electrical short is caused across the windings of the stator to further reduce the angular velocity of the disk.

主权项

1. A disk drive comprising:
a disk for storing data; a head for reading data from and writing data to the disk; a spindle motor including a stator with windings and a rotor configured to rotate the disk; and a controller configured to:
determine whether the disk drive is in a falling state while the disk rotates;when the disk drive is in the falling state, cause a negative torque to be applied to the rotor to reduce an angular velocity of the disk;determine whether the angular velocity of the disk has reached a threshold angular velocity; andwhen the angular velocity of the disk has reached the threshold angular velocity, stop causing the negative torque to be applied and cause an electrical short across the windings of the stator to further reduce the angular velocity of the disk.