Method and apparatus for controlling a multiple-stage actuator f

Details Method and apparatus for controlling a multiple-stage actuator f Method and apparatus for controlling a multiple-stage actuator f

1995-09-22

1999-07-06

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7803, 360 7805, G11B 5596

Patent

active

059204419

ABSTRACT:
A method and apparatus for controlling a multiple-stage actuator for a disk drive which does not require an additional sensor for measuring the relative position between adjacent actuator stages. In a two-stage actuator system, a position-type secondary actuator (SA) rides piggyback on a primary actuator (PA). The repeatable runout is measured and used as a feedforward signal to the PA. If the PA is a rotary actuator, the feedforward signal is preferably arc corrected for the arc that the head transverses from the inner radius to the outer radius of the disk. Added to the feedforward signal is the moving average of the drive signal applied to the SA. Because the SA is of the position-type having a neutral position, this moving average is proportional to the time cumulative drift present in the two-stage actuator system, and forces the PA in a direction that minimizes deviation of the SA from its neutral position. This minimizes the range requirement for the SA, the main purpose of which is to reduce non-repeatable runout.

REFERENCES:
patent: 3924268 (1975-12-01), McIntosh et al.
patent: 4866687 (1989-09-01), Kasai et al.
patent: 4914725 (1990-04-01), Belser et al.
patent: 5038333 (1991-08-01), Chow et al.
patent: 5060210 (1991-10-01), Fennema et al.
patent: 5063454 (1991-11-01), Hashimoto
patent: 5189578 (1993-02-01), Mori et al.
patent: 5303105 (1994-04-01), Jorgenson
patent: 5325245 (1994-06-01), Shinizu et al.
patent: 5406535 (1995-04-01), Seo et al.
patent: 5477402 (1995-12-01), Elliott et al.
patent: 5510939 (1996-04-01), Lewis
patent: 5521778 (1996-05-01), Boutaghou et al.
patent: 5521891 (1996-05-01), Nakane
L. Fan, IBM TDB, vol. 37, No. 08, Aug. 1994, pp. 401-403.
R.W. Lissner et al., "Disk File Actuator", IBM Technical Disclosure Bulletin, vol. 17, No. 10, Mar. 1975, pp. 3016-3018.
L-S. Fan et al., "Shock-Resistant Rotary Microactuator for Fine Positioning of Recording Heads", IBM Technical Disclosure Bulletin, vol. 37, No. 08, Aug. 1994, pp. 401-403.
L-S. Fan et al., "Batch-Fabricated Area-Efficient Milli-Actuators", Technical Digest of IEEE Solid-State and Actuator Workshop, Helton Head, S.C., Jun. 1994, pp. 38-42.
L-S. Fan et al., "Batch-Fabricated Milli-Actuators", Proceedings of IEEE Micro Electro Mechanical systems, Feb. 1993, pp. 179-183.

Affiliated with

Also associated with

Rating

Method and apparatus for controlling a multiple-stage actuator f does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for controlling a multiple-stage actuator f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for controlling a multiple-stage actuator f will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-903760