US2015380045A1PendingUtilityA1

Disk drive with improved spin-up control

42
Assignee: WESTERN DIGITAL TECH INCPriority: Apr 24, 2013Filed: Sep 3, 2015Published: Dec 31, 2015
Est. expiryApr 24, 2033(~6.7 yrs left)· nominal 20-yr term from priority
Inventors:Charles J. CalawayWenli YangAshok K. DesaiJinsik KimJianghong Ding
G11B 19/2054G11B 19/28
42
PatentIndex Score
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Claims

Abstract

A disk drive is disclosed comprising a head actuated over a disk, and a spindle motor configured to rotate the disk. The disk drive further comprises control circuitry configured to measure a rotation speed of the spindle motor, generate a feed-forward control based on the measured rotation speed, and spin-up the spindle motor based on the feed-forward control.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A disk drive comprising:
 a head actuated over a disk;   a spindle motor configured to rotate the disk; and   control circuitry configured to:
 measure a rotation speed of the spindle motor; 
 generate a feed-forward control based on the measured rotation speed; and 
 spin-up the spindle motor based on the feed-forward control. 
   
     
     
         2 . The disk drive as recited in  claim 1 , wherein the control circuitry is configured to generate the feed-forward control based on the measured rotation speed and an ambient temperature of the disk drive. 
     
     
         3 . The disk drive as recited in  claim 1 , wherein the control circuitry is configured to generate the feed-forward control proportional to the measured rotation speed. 
     
     
         4 . The disk drive as recited in  claim 3 , wherein the feed-forward control compensates for a back electromotive force of the spindle motor. 
     
     
         5 . The disk drive as recited in  claim 1 , wherein the feed-forward control compensates for a drag torque of the spindle motor. 
     
     
         6 . The disk drive as recited in  claim 5 , wherein the control circuitry is configured to generate the feed-forward control based on the measured rotation speed and an ambient temperature of the disk drive. 
     
     
         7 . A method of operating a disk drive comprising a head actuated over a disk, and a spindle motor configured to rotate the disk, the method comprising:
 measuring a rotation speed of the spindle motor;   generating a feed-forward control based on the measured rotation speed; and   spinning up the spindle motor based on the feed-forward control.   
     
     
         8 . The method as recited in  claim 7 , further comprising generating the feed-forward control based on the measured rotation speed and an ambient temperature of the disk drive. 
     
     
         9 . The method as recited in  claim 7 , further comprising generating the feed-forward control proportional to the measured rotation speed. 
     
     
         10 . The method as recited in  claim 9 , wherein the feed-forward control compensates for a back electromotive force of the spindle motor. 
     
     
         11 . The method as recited in  claim 7 , wherein the feed-forward control compensates for a drag torque of the spindle motor. 
     
     
         12 . The method as recited in  claim 11 , further comprising generating the feed-forward control based on the measured rotation speed and an ambient temperature of the disk drive. 
     
     
         13 . Control circuitry for use in a disk drive comprising a head actuated over a disk, and a spindle motor configured to rotate the disk, wherein the control circuitry is configured to:
 measure a rotation speed of the spindle motor;   generate a feed-forward control based on the measured rotation speed; and   spin-up the spindle motor based on the feed-forward control.   
     
     
         14 . The control circuitry as recited in  claim 13 , wherein the control circuitry is configured to generate the feed-forward control based on the measured rotation speed and an ambient temperature of the disk drive. 
     
     
         15 . The control circuitry as recited in  claim 13 , wherein the control circuitry is configured to generate the feed-forward control proportional to the measured rotation speed. 
     
     
         16 . The control circuitry as recited in  claim 15 , wherein the feed-forward control compensates for a back electromotive force of the spindle motor. 
     
     
         17 . The control circuitry as recited in  claim 13 , wherein the feed-forward control compensates for a drag torque of the spindle motor. 
     
     
         18 . The control circuitry as recited in  claim 17 , wherein the control circuitry is configured to generate the feed-forward control based on the measured rotation speed and an ambient temperature of the disk drive.

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