Title:
MAGNETIC DISK DEVICE
Document Type and Number:
Japanese Patent JPH03147577
Kind Code:
A
Abstract:
PURPOSE:To automatically adjust the closed loop gain quantity in a closed loop servo-mechanism for positioning a head by providing the closed loop servo- mechanism for positioning the head, and an automatic loop gain adjusting means which can adjust automatically the open loop gain quantity of this closed loop servo-mechanism. CONSTITUTION:A switch 11 is set to a turn-on state, and subsequently, the open loop gain quantity of a head positioning control circuit at the present time point is detected. Next, a microprocessor 15 compares the open loop gain quantity of the present time point and a target value, and executes a gain correction of a loop gain adjusting circuit 12 by outputting a control instruction in accordance with necessity. By repeating them, an optimal open loop gain quantity satisfiable of the target value is obtained finally. Thereafter, by setting the switch 11 to a turn-off state, a regular head positioning control state can be set. In such a way, the open loop gain quantity in a closed loop servo-mechanism being the head positioning control circuit can be adjusted automatically, and high reliability can be obtained.
Inventors:
HASHIMOTO MASAHIRO
Application Number:
JP28294089A
Publication Date:
June 24, 1991
Filing Date:
November 01, 1989
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
G11B21/10; H02P7/00; H02P25/034; H02P25/06; (IPC1-7): G11B21/10; H02P7/00
Attorney, Agent or Firm:
Mitsuteru Soga (5 people outside)