Browse Prior Art Database

Method of Reducing Torque for Magnetic Disk Files

IP.com Disclosure Number: IPCOM000119442D
Original Publication Date: 1991-Jan-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 1 page(s) / 37K

Publishing Venue

IBM

Related People

Petersen, TS: AUTHOR

Abstract

Disclosed is a method for reducing the torque that is required to start rotating a disk pack when there are multiple heads in contact with the disk surfaces.

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

Method of Reducing Torque for Magnetic Disk Files

      Disclosed is a method for reducing the torque that is required
to start rotating a disk pack when there are multiple heads in
contact with the disk surfaces.

      The required starting torque may be reduced by varying the
stiffness constant of the head/suspension/arm assemblies in the
direction that is tangential to the disk at the point of contact of
the head to the disk.  This will change the distance at which each
head breaks free from the disk, and will change the total starting
torque required to break free the ensemble of head/disk interfaces.

      The stiffness of each of the head/suspension/arm assemblies is
governed by the material properties and shape of each of the
components as well as the properties of the interfaces between these
components.  For example, the stiffness may be varied by changing the
width of the suspension beams, or by adding an elastic medium between
the suspension and arm.

      An alternative way of varying the stiffness in the disk
tangential direction while maintaining high stiffness in the other
directions is shown in the figure.  The dimension, t, of the arm
support can be adjusted by varying the width of the arm cutout.  This
can produce the required range of stiffnesses.

      Disclosed anonymously.