Title:
SERVO DEVICE FOR SEPARATED RECORDING AND REPRODUCING TYPE MAGNETIC DISK DEVICE, ESTIMATION METHOD FOR FORCE CONSTANT OF ACTUATOR IN DISK DEVICE AND COMPENSATION METHOD THEREFOR
Document Type and Number:
Japanese Patent JP2671780
Kind Code:
B2
Abstract:
PURPOSE: To reduce influence of servo caused by variation of a parameter (force constant) of an actuator.
CONSTITUTION: A driving current detecting signal 17 of an actuator and the number of passing tracks, and a position error signal 41 are taken in an observer 35, a speed estimation value is inputted to a controller 34. The controller 34 outputs a control output signal 64 for an actuator 10 using an input from the observer 35 and the like. A switch 68 of a reference sine wave generator 44 being a part of an estimation mechanism 45 for force constant is connected when estimation of force constant is performed, a reference sine wave 52 is superimposed on the control output signal. A parameter of the actuator 10, that is, force constant is estimated by the estimation mechanism 45 for force constant, and values of a memory 46 and parameter compensator 47, 48 are changed. An anti-aliasing filter 49 is switched so as to eliminate when the speed estimation value of the observer 35 is large. A speed profile generation mechanism 43 outputs a target speed profile 55 in the controller 34 in accordance with a left distance for accessing obtained from the controller 34.
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Inventors:
Toshiro Hattori
Application Number:
JP27570193A
Publication Date:
October 29, 1997
Filing Date:
November 04, 1993
Export Citation:
Assignee:
NEC
International Classes:
G05B13/02; G05D3/12; G11B5/55; G11B21/08; G11B21/10; (IPC1-7): G11B21/08; G05B13/02; G05D3/12; G11B21/10
Domestic Patent References:
| JP4255972A |
Attorney, Agent or Firm:
Shinsuke Honjo