Claims
- 1. A method for reducing off-track motion, the method comprising steps of:
(a) sensing movement with a sensor located on a suspension assembly of the storage device; (b) generating a sensor signal based on the sensed movement; and (c) using the sensor signal to reduce off-track motion.
- 2. The method of claim 1 wherein using step (c) comprises:
(c)(1) applying the sensor signal to a feedforward filter to generate a sensor control signal; and (c)(2) applying the sensor control signal to one or more actuators to position the head.
- 3. The method of claim 2 wherein applying the sensor signal to a feedforward filter comprises applying the sensor signal to a feedforward filter that is adaptively modified by a control system.
- 4. The method of claim 3 wherein the control system adaptively modifies the control filter through a gradient algorithm.
- 5. The method of claim 3 wherein the control system adaptively modifies the control filter using a neural network.
- 6. The method of claim 3 wherein the control system adaptively modifies the control filter using a fuzzy logic controller.
- 7. The method of claim 2 where using step (c) further comprises applying the sensor control signal to a feedback loop to reduce the effects of the sensor control signal on the sensor signal.
- 8. A method of dampening resonant modes in a storage device, the method comprising steps of:
(a) sensing movement with a sensor located on a suspension assembly of the storage device; (b) generating a sensor signal based on the sensed movement; and (c) using the sensor signal to dampen at least one resonant mode.
- 9. The method of claim 1 wherein using step (c) comprises:
(c)(1) applying the sensor signal to a feedback controller to generate a feedback control signal; and (c)(2) applying the feedback control signal to one or more actuators to position the head.
- 10. A data storage device for reading from a storage medium, the data storage device comprising:
a head for reading from the storage medium; a suspension assembly that supports the head; at least one actuator that moves the head by moving at least part of the suspension assembly; a sensor mounted on the suspension assembly that generates a sensor signal indicative of movement of the suspension assembly; and a servo circuit that generates a control signal for the at least one actuator based at least in part on the sensor signal.
- 11. The data storage device of claim 10 wherein the servo circuit comprises a feedforward filter that generates a sensor component of the control signal based on the sensor signal.
- 12. The data storage device of claim 11 wherein the servo circuit further comprises an adaptation component that adjusts the parameters of the feedforward filter.
- 13. The data storage device of claim 11 wherein the servo circuit further comprises a stabilizing feedback unit that reduces the affects of the control signal on the sensor signal.
- 14. The data storage device of claim 10 wherein the servo circuit further comprises a sensor feedback control that generates a feedback control signal based on the sensor signal.
- 15. The data storage device of claim 10 wherein the sensor is a MEMS accelerometer.
- 16. The data storage device of claim 10 wherein the sensor is a pressure sensor.
- 17. The data storage device of claim 10 wherein the sensor is a capacitive plate position sensor.
- 18. The data storage device of claim 10 wherein the sensor is a MEMS-based piezo-resistive sensor.
- 19. The data storage device of claim 10 wherein the sensor is a PVDF film sensor.
- 20. A disc drive for reading data from a storage medium, the disc drive comprising:
a suspension assembly for positioning a head over the storage medium, the suspension assembly supporting at least one suspension sensor; and control means coupled to the suspension sensor for utilizing a sensor signal from the suspension sensor to reduce off-track motion of the head.
- 21. The disc drive of claim 20 wherein the control means comprises a feedforward filter.
- 22. The disc drive of claim 21 wherein the control means further comprises an adaptation component that adjusts the parameters of the feedforward filter.
- 23. The disc drive of claim 21 wherein the control means further comprises a feedback loop.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority from U.S. Provisional application Ser. No. 60/239,972, filed Oct. 13, 2000 and entitled SUSPENSION SENSE CAPABILITY FOR WINDAGE CONTROL.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60239972 |
Oct 2000 |
US |