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The use of noncircular tracks for eliminating the deleterious effect of bearing sticktion in track-following servos for disk recording systems is described.
English (United States)
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Method for Overcoming Adverse Effects of Bearing Sticktion in Disk
The use of noncircular tracks for eliminating the deleterious effect of bearing
sticktion in track-following servos for disk recording systems is described.
Most bearings used in the head/slider carriage in disk recording systems
have a nonlinear velocity vs. force characteristic similar to that shown in Fig. 1.
This characteristic, commonly known as "sticktion," is well known to present
severe problems in accurate servoing in the nonlinear region of velocities
between -b and +b. When using circular tracks in disk recording systems, the
average head carrier velocity is zero, and hence the nonlinear region is included.
Many schemes, such as "dithering" i.e., purposely adding a small signal to move
the velocity back and forth through zero, have been employed to improve the
characteristics of serving.
Recognizing that tracks do not have to be circular, track following throughout
most of a revolution of a disk can be caused to take place in the linear region of
the bearings, for example, at velocities between b and c or -b and -c.
Fig. 2 illustrates, in a greatly exaggerated form, one embodiment of a
noncircular track to illustrate the idea. In this case, the radius See Original Page
2874 The scheme is further illustrated by the following example. Assume: 1)
Disk rotation speed 60 revolutions per second. 2) Two centimeters per second
head velocity is adequate to avoid the "sticktion"...