US 2010/0142086 A1 · METHOD AND APPARATUS FOR CONTROLLING THE EFFECTS OF SEEK-INDUCED VIBRATION OF A COMPONENT PART IN A HARD-DISK DRIVE

Abstract

A method for controlling the effects of seek-induced vibration of a component part in a hard-disk drive. The method includes determining a resonant frequency of seek-induced vibration of the component part and a reference amplitude of a frequency-component in a first voice-coil-motor signal (VCMS) at the resonant frequency. The method also includes synthesizing a second VCMS with an amplitude of a frequency-component attenuated below the reference amplitude of the frequency-component in the first VCMS at a frequency in a resonance-band bracketing the resonant frequency. The method also includes driving a voice-coil of a voice-coil motor with the second VCMS to reduce an amplitude of a frequency-component at the resonant frequency in a second PES of the seek of the data track associated with the second VCMS below a reference amplitude of a frequency-component at the resonant frequency in the first PES associated with the first VCMS.

Claims23

Dependent claims

A method for controlling the effects of seek-induced vibration of a component part in a hard-disk drive, said method comprising:

determining a resonant frequency of said seek-induced vibration of said component part and a reference amplitude of a frequency-component in a first position-error signal of a seek of a data track at said resonant frequency and a reference amplitude of a frequency-component in a first voice-coil-motor signal associated with said first position-error signal at said resonant frequency;
synthesizing a second voice-coil-motor signal with an amplitude of a frequency-component attenuated below said reference amplitude of said frequency-component in said first voice-coil-motor signal at a frequency in a resonance-band bracketing said resonant frequency;
and
driving a voice-coil of a voice-coil motor with said second voice-coil-motor signal to reduce an amplitude of a frequency-component at said resonant frequency in a second position-error signal of said seek of said data track associated with said second voice-coil-motor signal below said reference amplitude of said frequency-component in said first position-error signal associated with said first voice-coil-motor signal.

1 more element

A voice-coil-motor circuit configured to control the effects of seek-induced vibration of a component part in a hard-disk drive, said voice-coil-motor circuit comprising:

a voice-coil-motor-signal synthesizer configured to generate a second voice-coil-motor signal for a seek of a data track with an amplitude attenuated below a reference amplitude of a frequency-component of a first voice-coil-motor signal for said seek of said data track at a frequency in a resonance-band bracketing a resonant frequency of said seek-induced vibration of said component part;
and
a voice-coil motor electrically coupled to said voice-coil-motor-signal synthesizer and configured to be driven with said second voice-coil-motor signal to reduce an amplitude of a frequency-component at said resonant frequency in a second position-error signal associated with said second voice-coil-motor signal of said seek of said data track below a reference amplitude of a frequency-component in a first position-error signal associated with said first voice-coil-motor signal of said seek of said data track.

A hard-disk drive configured to control the effects of seek-induced vibration of a component part in said hard-disk drive, said hard-disk drive comprising:

an enclosure;
a head-arm assembly comprising:
a head-gimbal assembly comprising:
a magnetic-recording head;
a lead suspension attached to said magnetic-recording head;
and
a load beam attached at a gimbal portion of said load beam to a slider including said magnetic-recording head;
and
an arm attached to said head-gimbal assembly;
said magnetic-recording disk rotatably mounted on a spindle;
a drive motor mounted in said enclosure, said drive motor having a motor shaft attached to said spindle for rotating said magnetic-recording disk;
a voice-coil motor comprising:
an armature including a voice-coil attached to said arm;
and
a stator including a voice-coil magnet mounted in said enclosure;
wherein said armature of said voice-coil motor is attached to said arm and is configured to move said head-arm assembly to access portions of said magnetic-recording disk;
and
a voice-coil-motor circuit comprising:
a voice-coil-motor-signal synthesizer configured to generate a second voice-coil-motor signal for a seek of a data track with an amplitude attenuated below a reference amplitude of a frequency-component of a first voice-coil-motor signal for said seek of said data track at a frequency in a resonance-band bracketing a resonant frequency of said seek-induced vibration of said component part;
and
wherein said voice-coil motor is electrically coupled to said voice-coil-motor-signal synthesizer and is configured to be driven with said second voice-coil-motor signal to reduce an amplitude of a frequency-component at said resonant frequency in a second position-error signal of said seek of said data track associated with said second voice-coil-motor signal below a reference amplitude of a frequency-component in a first position-error signal of said seek of said data track associated with said first voice-coil-motor signal.

18 more elements

Dependencies are inferred from the claim text.

Method and apparatus for controlling the effects of seek-induced vibration of a component part in a hard-disk drive

Life of this patent

Method and apparatus for controlling the effects of seek-induced vibration of a component part in a hard-disk drive

Life of this patent

Abstract

Claims23