公开(公告)号：JPH1080171A

公开(公告)日：1998-03-24

申请号：JP19858896

申请日：1996-07-29

Applicant: IBM

Inventor： KISAKA MASASHI ,  TOGA KENJI ,  UCHIIKE HIROSHI

IPC: G11B19/20 ,  G11B19/28 ,  H02P23/16 ,  H02P27/02 ,  H02P27/06 ,  H02P29/00 ,  H02P5/00 ,  H02P5/402 ,  H02P5/41

Abstract: PROBLEM TO BE SOLVED: To provide a motor control apparatus by which a spindle motor at its start or the like can reach quickly a high-speed rotation state that data can be accessed by a method in which the driving force of the spindle motor is controlled on the basis of a difference obtained at a time when a new adjustment target frequency is input to a comparator in a frequency lock loop. SOLUTION: A measuring frequency is input to a frequency comparator 12, and its output is given to a charging pump 14. The output of the charging pump 14 is given to a loop filter 16 so as to be waveform-shaped. Its output is given to a motor driving mechanism 18 so as to control a motor driving current as the output of the motor driving mechanism 18. By the controlled driving current, a spindle motor 20 is turned. The rotational speed of the spindle motor 20 is converted into a frequency by a V/F converter 22 so as to be input to the frequency converter 12 as the measuring frequency. The difference between the measuring frequency obtained from the rotational speed of a motor and a final target frequency is input to a digital filter 30.

公开(公告)号：JP2001291346A

公开(公告)日：2001-10-19

申请号：JP2000093351

申请日：2000-03-30

Applicant: IBM

Inventor： TOGA KENJI ,  OZAWA YUTAKA ,  KISAKA MASASHI

IPC: G11B21/08 ,  G11B5/55 ,  G11B19/28 ,  G11B21/10 ,  G11B19/14 ,  G11B19/247

Abstract: PROBLEM TO BE SOLVED: To control the position of a head section to a prescribed target position even if the position detecting data of the head section by servo information is not obtainable and to downsize a disk device. SOLUTION: This disk device has a disk (1) which is the recording medium of the data, a spindle motor (2) which rotates the disk, disk rotating speed control means (61 and 62) which supply the spindle current (Ispn) for rotating the disk at a constant speed to the spindle morter, a head section 3 which accesses to the disk, an actuator which moves the head section and head position control means (63-66 and 75) which control the position of the head section (3) by driving the actuator. The head position control means described above acquire the value of the spindle current and control the position of the head section in accordance with the spindle current value by utilizing the changing of the spindle current which varies according to the position changing of the head section.

公开(公告)号：JP2001273707A

公开(公告)日：2001-10-05

申请号：JP2000089857

申请日：2000-03-28

Applicant: IBM

Inventor： KISAKA MASASHI ,  OZAWA YUTAKA ,  TOGA KENJI

IPC: G11B19/04 ,  G11B21/12 ,  G11B25/04 ,  G11B33/08 ,  G11B19/02

Abstract: PROBLEM TO BE SOLVED: To obtain superior recording reliability for a rotary storage device that utilizes a high density recording medium under the environment in which shock or vibration exists. SOLUTION: The device has a means which outputs a shock out signal SO when an output from an acceleration sensor exceeds a prescribed threshold value, a latch circuit 21 which outputs a high level latch signal during a prescribed write inhibit interval after the signal SO is inputted, a write gate signal WG which outputs a high level signal when a write approval is given and an AND circuit 23 which generates a write approval signal when a NOT output of the latch signal and the signal WG are inputted.