Torque disturbance precompensation for disk drive spindle motors

Details Torque disturbance precompensation for disk drive spindle motors Torque disturbance precompensation for disk drive spindle motors

1993-07-08

1995-12-05

Wysocki, Jonathan

Electrical generator or motor structure

Dynamoelectric

Rotary

318632, 360 7303, H02P 300

Patent

active

054732301

ABSTRACT:
An apparatus and method for torque disturbance precompensation in a disk drive spindle motor includes an amplifier for providing current to the spindle motor in response to an input signal. A velocity detector determines the velocity of the motor, which is then compared to a predetermined velocity to generate an error signal. Compensator elements of the control loop develop an actuating signal from the error signal. The actuating signal is then summed with a torque correction value provided by a look-up table. The torque correction value precompensates the motor by causing the amplifier to provide an additional incremented current to the motor. The additional current corrects the torque disturbance resulting from the movement of the heads across the disk.

REFERENCES:
patent: 4139811 (1979-02-01), Klinger
patent: 4398227 (1983-08-01), Anderson
patent: 4507592 (1985-03-01), Anderson
patent: 4902949 (1990-02-01), Hirata
patent: 4979055 (1990-12-01), Squires et al.
patent: 5051976 (1991-09-01), Kawano et al.
patent: 5086421 (1992-02-01), Tateishi
patent: 5285378 (1994-02-01), Matsumoto
patent: 5305160 (1994-04-01), Funches et al.

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