公开(公告)号：DE3009548A1

公开(公告)日：1981-09-24

申请号：DE3009548

申请日：1980-03-13

Applicant: IBM DEUTSCHLAND

Inventor： MATLA ARNO DIPL PHYS ,  ZIMMERMANN VOLKER DIPL ING

IPC: G05D3/12 ,  G11B5/58 ,  G11B5/596 ,  G11B21/10 ,  G11B17/06

Abstract: For the servo track control of magnetic heads over magnetic tracks, in addition to the main servo position signals arranged in offset fashion to the middle of the track, auxiliary servo position signals are provided symmetrically on each side of the middle of the track. These auxiliary servo position signals are offset along the track length relative to each other and are smaller than half the track width. In the determination of the position error signal, they serve to indicate the tilting of the magnetic head relative to the recording track in that they are unequal. If the magnetic head deviates greatly from the middle of the track, these auxiliary servo position signals can be added to the main servo position signals to obtain a stronger position error signal. For determining and compensating uniform disturbance variables, the momentary values of a control signal are measured and a mean value is formed thereof which, at predetermined intervals, is added to a preceding mean value, stored, and entered as an additional control signal to the control path.

公开(公告)号：DE2759066A1

公开(公告)日：1979-07-12

申请号：DE2759066

申请日：1977-12-30

Applicant: IBM DEUTSCHLAND

Inventor： MATLA ARNO DIPL PHYS ,  ZIMMERMANN VOLKER

IPC: G05D3/12 ,  G11B5/55 ,  G11B21/08 ,  G11B21/10 ,  G11B5/012

Abstract: During the access mode of a movable magnetic head in a disk file, a program of position control signals is derived from a simulator, the input of which is clocked at sector time intervals. The position control signals of the simulator are periodically transferred to the summing point of a servo loop which successively is error conditioned, dependent on the subsequent nominal magnetic head positions derived from the simulator. Servo sectors on the data disk are sampled by the magnetic head, evaluated and converted to a digitally coded position error signal. The error signal is summed with a digital position control signal, and the output sum signal in analog form is applied to the motor that drives the head. The track following function is accomplished by means of a closed servo loop, which is also used in the access mode.

公开(公告)号：DE2759065A1

公开(公告)日：1979-07-12

申请号：DE2759065

申请日：1977-12-30

Applicant: IBM DEUTSCHLAND

Inventor： MATLA ARNO DIPL PHYS ,  MATTHAEI HORST DIPL ING ,  ZIMMERMANN VOLKER DIPL ING

IPC: H02K33/18 ,  F16F15/03 ,  G05B19/39 ,  G11B5/55 ,  G11B5/58 ,  H02P25/06 ,  F16F15/02

Abstract: In a signal storage apparatus employing a rotating record disk, the resonant frequency of a head carriage assembly is tuned to the rotational speed of the record disk. The head carriage assembly, in following a record track on the record disk, has to accommodate record disk rotational perturbations; i.e., run out, eccentric mounting, etc. Such variations are better accommodated in the head carriage assembly by electrically tuning the head carriage assembly to the rotation of the record disk. In a voice coil head assembly actuator, a pair of opposing coils carry equal current amplitudes. These equal current amplitudes are adjusted to rotational speed of the record disk to thereby continuously tune the head carriage assembly to the record disk rotation.

公开(公告)号：DE2558359A1

公开(公告)日：1977-07-07

申请号：DE2558359

申请日：1975-12-23

Applicant: IBM DEUTSCHLAND

Inventor： LOUIS HELMUT DIPL ING DR ,  MATLA ARNO DIPL PHYS ,  SCHALLER KARL-H DIPL ING ,  ZIMMERMANN VOLKER DIPL ING

IPC: G11B21/08 ,  G11B5/596 ,  G11B21/10 ,  G11B5/54

Abstract: The surface of a magnetic disk (23) is divided into servo sectors (S1) and data sectors (S2). A selectively positionable magnetic head (24) effects, in predetermined time intervals controlled by clock signals of a clock sensor (26), the transfer of servo and data signals. The servo signals sensed in the servo sectors are used for the track following control of the magnetic head.