Title:
POSITIONING CONTROLLER
Document Type and Number:
Japanese Patent JP3796435
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To make a head position highly accurately follow up a position track and a speed track even for the saturation of a VCM (voice coil motor) current as to the positioning system of a magnetic disk unit.
SOLUTION: Internal models 42 to 44 and a track generation part 40 are structure in a control program and a model control part 41 calculates a 1st operation signal Umf and a 2nd operation signal Ums so that an operation signal for outputting the Ums for a fixed sample time Tu after the Umf outputted for the fixed sample time Tu matches a position track and a speed track where a position Pm and a speed Vm outputted by an internal model 2×Tu second later are formed. When a detector 48 detects the saturation of a voice coil current for head movement, the signal obtained by subtracting a position feedback signal Uh from the detected voice coil current is inputted to the internal model to make the model follow up the controlled system, thereby preventing deterioration in control performance.
Inventors:
Takenori Atami
Masato Kobayashi
Nakagawa Shinsuke
Masato Kobayashi
Nakagawa Shinsuke
Application Number:
JP2001351925A
Publication Date:
July 12, 2006
Filing Date:
November 16, 2001
Export Citation:
Assignee:
Hitachi Global Storage Technologies Co., Ltd.
International Classes:
G11B21/08; G05D3/12; G11B5/55; G11B21/10; (IPC1-7): G11B21/08; G05D3/12; G11B21/10
Domestic Patent References:
| JP2001006304A | ||||
| JP2001283544A | ||||
| JP10228737A | ||||
| JP10214116A | ||||
| JP3272063A |
Attorney, Agent or Firm:
Yoshihiro Takasaki