Method and apparatus to prevent servo instability due to coupling between voice coil motor and feedforward sensor

摘要

A voice coil motor control signal is detected being coupled into a vibration sensor of a hard disk drive. The vibration sensor is used to provide a feedforward signal to a servo control system of the hard disk drive. In response to detecting the coupling, the feedforward signal is modified to prevent instability of the servo control system.

主权项

1. A method comprising:
estimating an electromagnetic coupling of a voice coil motor control signal into a vibration sensor of a hard disk drive, the vibration sensor used to provide a feedforward signal to a servo control system of the hard disk drive; and in response to the estimation, modifying the feedforward signal to prevent instability of the servo control system.