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High Performance Rotary Actuator

IP.com Disclosure Number: IPCOM000099727D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 70K

Publishing Venue

IBM

Related People

Reidenbach, JR: AUTHOR

Abstract

The figures illustrate a pair of high performance rotary actuators designed for a two-actuator disk drive. Each actuator arm is terminated by a single read/write head/suspension assembly (HSA), thereby allowing the rotating magnetic media (disks) to be stacked closer together than the usual two HSA back-to-back configurations. Each actuator functions independently of the other. Fig. 1 illustrates this side-by-side actuator system. A top surface of a top disk in a stack of rotating disks contains servo seeking/following data; there fore, a top read/write head (servo) of each actuator accesses that same surface. All remaining heads service unique surfaces. Consequently, one actuator is fitted with all down-facing heads, and, except for the top head, the other actuator is fitted with all up-facing heads.

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High Performance Rotary Actuator

       The figures illustrate a pair of high performance rotary
actuators designed for a two-actuator disk drive.  Each actuator arm
is terminated by a single read/write head/suspension assembly (HSA),
thereby allowing the rotating magnetic media (disks) to be stacked
closer together than the usual two HSA back-to-back configurations.
Each actuator functions independently of the other.  Fig. 1
illustrates this side-by-side actuator system.  A top surface of a
top disk in a stack of rotating disks contains servo
seeking/following data; there fore, a top read/write head (servo) of
each actuator accesses that same surface.  All remaining heads
service unique surfaces.  Consequently, one actuator is fitted with
all down-facing heads, and, except for the top head, the other
actuator is fitted with all up-facing heads.

      Each actuator is driven by a voice coil motor (VCM) consisting
of a permanent magnet assembly and a wound coil. Each coil is
integral with a comb assembly that supports a set of HSAs.  Except
for unique flex cables and HSA arrangements, one actuator, when
inverted, satisfies either of the two positions.

      Fig. 2 is an exploded view showing the primary elements of the
actuator assembly.  A magnet housing assembly 1 consists of two
identical halves.  Curved permanent magnets 2 mate with corresponding
curved housing sections, and a copper tubing shorted turn 3 mates
with the housing's curved center sect...