Stretching servo performances on a spin stand

To support a higher track recording density for future generation magnetic recording systems on a conventional spin stand, good servo controllers and high-bandwidth actuators are needed. We add an additional sub-stage piezo actuator with sub-nm resolution to an existing spin stand system. The combin...

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Bibliographic Details
Published in:	2004 American Control Conference Proceedings; Volume 2 of 6 Vol. 2; pp. 1159 - 1164 vol.2
Main Authors:	Feng, Lu, Wong, Waiee, Du, Chunling, Duan, Chang, Guo, Guo Xiao, Chong, Tow Chong, Ye, Weichun
Format:	Conference Proceeding Journal Article
Language:	English
Published:	Piscataway NJ IEEE 01-01-2004 Evanston IL American Automatic Control Council
Subjects:	Actuators Applied sciences Computer science; control theory; systems Control system synthesis Control systems Control theory. Systems Decoding Electronics Exact sciences and technology Feedforward systems Frequency Magnetic recording Miscellaneous Rail to rail outputs Servomechanisms Signal generators Signal resolution Storage and reproduction of information Bandwidth Control synthesis Decoding Feedforward Modeling Servomechanism Differential integral proportional control Actuator Magnetic recording
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Summary:	To support a higher track recording density for future generation magnetic recording systems on a conventional spin stand, good servo controllers and high-bandwidth actuators are needed. We add an additional sub-stage piezo actuator with sub-nm resolution to an existing spin stand system. The combination of a frequency-encoded servo pattern and a simplified decoding scheme is applied to generate the position error signal (PES) by means of an external PC-based servo system. Various servo control techniques, namely, PID control, near-perfect modeling (NPM) low-hump design, low hump H/sub /spl infin// control and feed-forward RRO compensation are designed and implemented on the same platform. Control performance comparison is then made and the experimental results show that PES 3/spl sigma/ is improved by up to 23.7% with the low-hump design together with the feed-forward RRO compensation.
Bibliography:	SourceType-Scholarly Journals-2 ObjectType-Feature-2 ObjectType-Conference Paper-1 content type line 23 SourceType-Conference Papers & Proceedings-1 ObjectType-Article-3
ISBN:	9780780383357 0780383354
ISSN:	0743-1619 2378-5861
DOI:	10.23919/ACC.2004.1386729