COMPENSATING FOR VOICE COIL MOTOR AND MICROACTUATOR DISTURBANCE IN A HARD DRIVE

摘要

In response to positioning a read/write head of a hard drive, a voice coil motor (VCM) input signal is applied to a voice coil motor and a microactuator (PZT) input signal is applied to a microactuator. A position signal is determined in response to positioning the read/write head. A PZT component is decoupled from the position signal to determine an estimated VCM response. The estimated VCM response used to determine an estimated VCM disturbance. A VCM component is decoupled from the position signal to determine an estimated PZT response. The estimated PZT response used to determine an estimated PZT disturbance. The VCM input signal and the PZT input signal are modified respectively to compensate for the estimated VCM disturbance and the estimated PZT disturbance.

主权项

1. A method comprising:
applying a voice coil motor (VCM) input signal to a voice coil motor and a microactuator (PZT) input signal to a microactuator in response to positioning a read/write head of a hard drive; determining a position signal in response to positioning the read/write head; decoupling a PZT component from the position signal to determine an estimated VCM response, the estimated VCM response used to determine an estimated VCM disturbance; decoupling a VCM component from the position signal to determine an estimated PZT response, the estimated PZT response used to determine an estimated PZT disturbance; and modifying the VCM input signal and the PZT input signal respectively to compensate for the estimated VCM disturbance and the estimated PZT disturbance.