Data storage apparatus, rotation control apparatus, and...

Details Data storage apparatus, rotation control apparatus, and... Data storage apparatus, rotation control apparatus, and...

2006-02-28

2006-02-28

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

C318S254100, C318S434000, C388S801000

Reexamination Certificate

active

07006321

ABSTRACT:
The object is to raise controller gain while absorbing magnet position dispersion in a motor, and implement rotation control that is resistant to the influence of disturbance. There are provided a spindle motor3that performs rotational drive of a predetermined drive object, and a controller121that controls rotational drive of this spindle motor3by comparing a pulse time in rotational drive of this spindle motor3with a predetermined target time and performing feedback; and also provided is a peak filter122that compensates control by the controller121by varying the target time dynamically so as to suppress the rotation frequency and higher harmonic components thereof contained in the drive current waveform of the spindle motor3.

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Kisaka, Masashi and Ozawa, Yutaka, “Rejection of Repeatable Error with High Order Harmonics”, Technical Report of IEICE, 1995, p. 53, C-361, IEICE, Japan.

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