Disk drive and method for improved disk rotation control

Details Disk drive and method for improved disk rotation control Disk drive and method for improved disk rotation control

2006-05-23

2006-05-23

Wong, K. (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

Reexamination Certificate

active

07050258

ABSTRACT:
The invention relates to a disk drive and related method for improved disk rotation rate control in the presence of seek operations. A spindle motor rotates a spindle, supporting at least one disk with a magnetic recording surface, in response to a motor current. The actuator radially positions a transducer head over the recording surface. The motor is subjected to a torque load component related to the transducer head radial position. The spindle motor controller has a feedback control loop and a feedforward control element. The feedback control loop maintains a relatively constant spindle rotation rate based on a difference error between a predetermined target spindle rotation rate parameter and a measured spindle rotation rate parameter. The feedforward control element, in conjunction with a seek operation, adjusts the motor current based on a target head radial position with respect to an initial head radial position.

REFERENCES:
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patent: 5589996 (1996-12-01), Patrick et al.
patent: 5592345 (1997-01-01), Carobolante et al.
patent: 6097564 (2000-08-01), Hunter
patent: 6388832 (2002-05-01), Dobbek et al.

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