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Browse Prior Art Database

Torque Amplification with Bias Current for Stiction

IP.com Disclosure Number: IPCOM000117928D
Original Publication Date: 1996-Jul-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Ohta, M: AUTHOR [+3]

Abstract

Hard Disk Drive (HDD) fails to spin up due to excessive stiction between a slider and a disk. 'Torque Amplification' is a microcode based procedure that is executed when the HDD fails to start up normally. The HDD is excited by a pulsating force achieved by turning the motor on/off (max/zero) repeatedly, that is to drive the spindle motor so as to amplify the available torque via mechanical resonances to break free the stuck sliders.

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This is the abbreviated version, containing approximately 100% of the total text.

Torque Amplification with Bias Current for Stiction

      Hard Disk Drive (HDD) fails to spin up due to excessive
stiction between a slider and a disk.  'Torque Amplification' is a
microcode based procedure that is executed when the HDD fails to
start up normally.  The HDD is excited by a pulsating force achieved
by turning the motor on/off (max/zero) repeatedly, that is to drive
the spindle motor so as to amplify the available torque via
mechanical resonances to break free the stuck sliders.

      There is one issue that causes serious problems...the present
torque amplification process cannot get sufficient torque.  For
solving this problem, a new method to get enough torque is provided
by this invention.  According to this new method, a little current
(bias current) is input in the process of supplying the current
pulse.  With this method, the total torque can be larger than the
conventional method.