公开(公告)号：JP2001101784A

公开(公告)日：2001-04-13

申请号：JP27332799

申请日：1999-09-27

Applicant: IBM

Inventor： IKEDO MANABU ,  YUZUBA AKINORI ,  KAGAMI NAOYUKI

IPC: G11B21/12 ,  G11B19/28

Abstract: PROBLEM TO BE SOLVED: To provide a load/unload type disk driver that can control motor revolution with high accuracy after a head is loaded in the load/unload type disk driver. SOLUTION: Since a slew rate is switched in cross-reference with loading/ unloading of the head, the operating noise sound of the motor can be reduced at a steady-state rotation and the rotational speed can be controlled with high accuracy on the occurrence of a load fluctuation of the spindle motor due to loading of the head.

公开(公告)号：JP2003316523A

公开(公告)日：2003-11-07

申请号：JP2002110702

申请日：2002-04-12

Applicant: Internatl Business Mach Corp ,  インターナショナル・ビジネス・マシーンズ・コーポレーション

Inventor： NISHINOMIYA HIROMI ,  KAKIHARA TOSHIO ,  YUZUBA AKINORI ,  OYAMA TOMOYUKI

IPC: G06F3/06 ,  G06F12/00 ,  G11B20/10

CPC classification number: G06F3/0659 ,  G06F3/061 ,  G06F3/0674

Abstract: PROBLEM TO BE SOLVED: To provide a method for selecting an execution command capable of improving performance when the depth of a queue is deep.
SOLUTION: An execution standby time D1 of a command C1 exceeds the 1/4 cycle of a reference time CRT. An execution standby time D8 of a command C8 is 8/64 (1/4) cycle, and this fulfills requirements superior to reference time CRT. Also, the execution standby time D8 of the command C8 is not less than a scanning time SCN. Therefore, the command C8 is selected as a command to be selected the next. After this command is selected, the calculation of the execution standby time for any following command posterior to a command C9 is stopped.
COPYRIGHT: (C)2004,JPO

Abstract translation: 要解决的问题：提供一种当队列深度较深时能够提高性能的执行命令的选择方法。 解决方案：命令C1的执行待机时间D1超过参考时间CRT的1/4周期。 命令C8的执行待机时间D8为8/64（1/4）周期，这满足了优于参考时间CRT的要求。 此外，命令C8的执行待机时间D8不小于扫描时间SCN。 因此，命令C8被选择为下一个选择的命令。 选择此命令后，停止对命令C9后面的任何后续命令的执行待机时间的计算。 版权所有（C）2004，JPO

公开(公告)号：JP2002258902A

公开(公告)日：2002-09-13

申请号：JP2001053226

申请日：2001-02-27

Applicant: IBM

Inventor： UCHIDA HIROSHI ,  SENBA TETSUO ,  YUZUBA AKINORI ,  TOKIZONO AKIRA ,  KAGAMI NAOYUKI ,  OKADA KENJI

IPC: G11B21/08 ,  G05B11/32 ,  G05B13/04 ,  G11B5/596

Abstract: PROBLEM TO BE SOLVED: To reduce a modeling error including a control model assumed under model follow-up control to a level in which any practical problem is not generated concerning a gain and a phase. SOLUTION: In a control means having a feed-forward system and a feedback system, a control model for generating reference position data yr from a feed- forward control signal Uff0 is divided into an original control model 22 and a correction filter 23. Also, the gain correction of the feed-forward control signal Uff0 is operated by a gain correcting means 24, and a corrected feed- forward control signal Uff is generated. The reference position data yr are inputted to a feedback controller 25, and a feedback control signal Ufb being the output of the feedback controller 25 and the feed-forward control signal Uff are inputted to an object 26 to be controlled. The coefficients of a correction filter 23 and a gain correcting means 24 are corrected according to a head orbit based on the actual seek operation.