Electronic system with vibration management mechanism and method of operation thereof

• US 9,013,825 B1
• Filed: 06/20/2014
• Issued: 04/21/2015
• Est. Priority Date: 03/24/2014
• Status: Active Grant

• Current Assignee: JP Morgan Chase Bank, N.A. (JP Morgan Chase & Co)
• Original Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Inventors: Chahwan, Alain
• Primary Examiner(s): Neyzari, Ali
• Application Number:
  US14/310,944
• Time in Patent Office: 305 Days
• Field of Search: 360/75, 360/55, 360/51, 360/77.07, 360/77.08, 360/47.28, 714/6.3, 711/112, 369/44.34, 369/44.29, 369/44.35
• US Class Current: 360/75
• CPC Class Codes: G11B 5/5534 Initialisation, calibration, e.g. cylinder "set-up"
• CPC Class Codes: G11B 5/5582 system adaptation for working during or after external perturbation, e.g. in the presence of a mechanical oscillation caused by a shock
• CPC Class Codes: G11B 5/59694 System adaptation for working during or after external perturbation, e.g. in the presence of a mechanical oscillation caused by a shock

Abstract

An apparatus includes: a media; a head assembly over the media; a head actuation motor coupled to the head assembly; control circuitry, coupled to the head actuation motor, configured to position the head assembly; and a microphone, coupled to the control circuitry, configured to generate a signal in response to a vibration; and wherein: the control circuitry is further configured to: generate a compensation value based on the signal; and control the head actuator motor based on the compensation value.

Claims

1. An apparatus comprising:

a media;

a head assembly over the media;

a head actuation motor coupled to the head assembly;

control circuitry, coupled to the head actuation motor, configured to position the head assembly; and

a microphone, coupled to the control circuitry, configured to generate a signal in response to a vibration; and

wherein;

the control circuitry is further configured to;

generate a compensation value based on the signal; and

control the head actuator motor based on the compensation value.

2. The apparatus as claimed in claim 1 further comprising a read channel, coupled to the control circuitry, configured to demodulate servo sectors on the media for estimating a position of the head assembly.

3. The apparatus as claimed in claim 1 wherein the control circuitry is further configured to control the head actuator motor by calculating a head actuation motor control for accelerating the head assembly based on a position error signal and the compensation value.

4. The apparatus as claimed in claim 1 wherein the control circuitry is further configured to calculate a fine-positioner control for adjusting a position of the head within a data track on the media.

5. The apparatus as claimed in claim 1 wherein the control circuitry is further configured to calculate a position error signal from an estimated position and a reference position.

6. The apparatus as claimed in claim 5 wherein the control circuitry is further configured to scale the compensation value based on the position error signal.

7. The apparatus as claimed in claim 5 wherein the compensation value comprises a feed-forward compensation value scaled by the position error signal.

8. The apparatus as claimed in claim 1 wherein the control circuitry further comprises a feed-forward generator configured to generate a feed-forward compensation value, the control circuitry further configured to:

generate a position error signal representing a difference between an estimated position of the head assembly and a reference position; and

adapt the feed-forward generator based on the compensation value and the PES.

9. The apparatus as claimed in claim 1 wherein the control circuitry is further configured to adapt a feed-forward generator during a calibration procedure when the microphone detects a predetermined signal.

10. The apparatus as claimed in claim 1 wherein the microphone comprises an electret microphone.

11. The apparatus as claimed in claim 1 wherein the control circuitry is further configured to monitor the vibration caused by impact between the head assembly, a loading ramp, the media, or a combination thereof.

12. A method of operating an apparatus, the method comprising:

flying a head assembly over a media;

controlling a head actuation motor for positioning the head assembly over the media;

generating a compensation value based on a microphone signal that is generated based on a vibration; and

controlling the head actuation motor based on the compensation value.

13. The method as claimed in claim 12 further comprising demodulating servo sectors on the media for estimating a position of the head assembly.

14. The method as claimed in claim 12 wherein controlling the head actuation motor based on the compensation value further comprises calculating a head actuation motor control for accelerating the head assembly based on a position error signal and the compensation value.

15. The method as claimed in claim 12 further comprising calculating a fine-positioner control for adjusting a position of the head assembly within a data track on the media.

16. The method as claimed in claim 12 further comprising calculating a position error signal from an estimated position and a reference position.

17. The method as claimed in claim 16 wherein the compensation value is scaled based on the position error signal and a reference position.

18. The method as claimed in claim 16 wherein the compensation value comprises a feed-forward compensation value scaled by the position error signal.

19. The method as claimed in claim 12 further comprising:

generating a position error signal representing a difference between an estimated position of the head assembly and a reference position; and

adapting a feed-forward generator based on the compensation value and the PES.

20. The method as claimed in claim 12 further comprising adapting a feed-forward generator during a calibration procedure when the microphone detects a predetermined signal.

21. The method as claimed in claim 12 wherein the microphone includes an electret microphone.

22. The method as claimed in claim 12 further comprising monitoring the vibration caused by impact between the head assembly, a loading ramp, the media, or a combination thereof.