DocumentCode
2823396
Title
Active damping in HDD actuator
Author
Fu-Ying Huang ; Semba, T. ; Imaino, W. ; Lee, F.
Author_Institution
IBM Almaden Res. Center, San Jose, CA, USA
fYear
2000
fDate
6-8 Nov. 2000
Abstract
A non-traditional mechanical modification technique to take care of the major servo bandwidth limited resonance mode (butterfly mode) is developed, analyzed, and validated. With an additional sensor on the actuator and an external feedback loop, the butterfly mode can be damped and stiffened such that the gain of the head mechanical transfer function is close to 1/s/sup 2/. Servo improvement is also studied comparing to notch filter approach. It shows that the butterfly mode notch filter can be removed, and the phase margin can be improved by 7 degrees.
Keywords
actuators; damping; disc drives; feedback; hard discs; notch filters; servomotors; transfer functions; HDD actuator; active damping; butterfly mode; feedback loop; gain; magnetic recording head; mechanical transfer function; notch filter; resonance mode; servo bandwidth; Actuators; Bandwidth; Capacitive sensors; Damping; Feedback; Filters; Mechanical sensors; Resonance; Servomechanisms; Transfer functions;
fLanguage
English
Publisher
ieee
Conference_Titel
Asia-Pacific Magnetic Recording Conference, 2000. APMRC 2000
Conference_Location
Tokyo, Japan
Print_ISBN
0-7803-6254-3
Type
conf
DOI
10.1109/APMRC.2000.898912
Filename
898912
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