Multirate digital control for high track density magnetic disk drives

Seung Hi Lee, Choo Chung Chung, Sang Min Suh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

As track density increases, higher control bandwidth is required to attain sufficient positioning accuracy while suppressing the effect of high frequency disturbances in disk drive controllers/actuators. This paper presents a computation effective fixed order multirate digital control system. The multirate controller outputs control at each control update instant, while the multirate control scheme is evenly computed every measurement sampling period, thereby eliminating the need for very powerful processors for implementation. As the input multiplicity increases, the control command becomes smoother, without losing phase and gain margins, so as to reduce the chance of the actuator flexible mode excitation that should be avoided in high track density disk drive servos. Application results demonstrate how the proposed multirate digital scheme substantially removes the excitation of the actuator arm/suspension flexible mode dynamics due to the discrete stepwise control input.

Original languageEnglish
Title of host publicationDigest of the Asia-Pacific Magnetic Recording Conference 2002, APMRC 2002
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)0780375092, 9780780375093
DOIs
StatePublished - 2002 Jan 1
EventAsia-Pacific Magnetic Recording Conference 2002, APMRC 2002 - Singapore, Singapore
Duration: 2002 Aug 272002 Aug 29

Other

OtherAsia-Pacific Magnetic Recording Conference 2002, APMRC 2002
CountrySingapore
CitySingapore
Period02/08/2702/08/29

Fingerprint

Actuators
Digital control systems
Servomotors
Controllers
Suspensions
Sampling
Bandwidth

Cite this

Lee, S. H., Chung, C. C., & Suh, S. M. (2002). Multirate digital control for high track density magnetic disk drives. In Digest of the Asia-Pacific Magnetic Recording Conference 2002, APMRC 2002 [1037632] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/APMRC.2002.1037632
Lee, Seung Hi ; Chung, Choo Chung ; Suh, Sang Min. / Multirate digital control for high track density magnetic disk drives. Digest of the Asia-Pacific Magnetic Recording Conference 2002, APMRC 2002. Institute of Electrical and Electronics Engineers Inc., 2002.
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Lee, SH, Chung, CC & Suh, SM 2002, Multirate digital control for high track density magnetic disk drives. in Digest of the Asia-Pacific Magnetic Recording Conference 2002, APMRC 2002., 1037632, Institute of Electrical and Electronics Engineers Inc., Asia-Pacific Magnetic Recording Conference 2002, APMRC 2002, Singapore, Singapore, 02/08/27. https://doi.org/10.1109/APMRC.2002.1037632

Multirate digital control for high track density magnetic disk drives. / Lee, Seung Hi; Chung, Choo Chung; Suh, Sang Min.

Digest of the Asia-Pacific Magnetic Recording Conference 2002, APMRC 2002. Institute of Electrical and Electronics Engineers Inc., 2002. 1037632.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - As track density increases, higher control bandwidth is required to attain sufficient positioning accuracy while suppressing the effect of high frequency disturbances in disk drive controllers/actuators. This paper presents a computation effective fixed order multirate digital control system. The multirate controller outputs control at each control update instant, while the multirate control scheme is evenly computed every measurement sampling period, thereby eliminating the need for very powerful processors for implementation. As the input multiplicity increases, the control command becomes smoother, without losing phase and gain margins, so as to reduce the chance of the actuator flexible mode excitation that should be avoided in high track density disk drive servos. Application results demonstrate how the proposed multirate digital scheme substantially removes the excitation of the actuator arm/suspension flexible mode dynamics due to the discrete stepwise control input.

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Lee SH, Chung CC, Suh SM. Multirate digital control for high track density magnetic disk drives. In Digest of the Asia-Pacific Magnetic Recording Conference 2002, APMRC 2002. Institute of Electrical and Electronics Engineers Inc. 2002. 1037632 https://doi.org/10.1109/APMRC.2002.1037632