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
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;
Conference_Titel :
Asia-Pacific Magnetic Recording Conference, 2000. APMRC 2000
Conference_Location :
Tokyo, Japan
Print_ISBN :
0-7803-6254-3
DOI :
10.1109/APMRC.2000.898912
