Method and apparatus for preventing an over-velocity error condi

Details Method and apparatus for preventing an over-velocity error condi Method and apparatus for preventing an over-velocity error condi

1988-11-02

1990-10-30

Faber, Alan

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 75, 369 32, 388806, 388815, G11B 555

Patent

active

049672916

ABSTRACT:
An apparatus for detecting an over-velocity error condition of a head actuator driven by a voice coil motor in a hard disk drive system includes an integrator for providing an integrated value of the current flowing through the voice coil motor and a detector for detecting when the integrated value exceeds a threshold value. In response to this detection, the supply of current through the voice coil motor is interrupted. To prevent false detections, the integrator is inhibited until the motor current reaches a level indicative of a track access operation.

REFERENCES:
patent: 3568059 (1971-03-01), Sordello
patent: 3883894 (1975-05-01), Johnson
patent: 4246536 (1981-01-01), Bradley et al.
patent: 4263627 (1981-04-01), Rose et al.
patent: 4321517 (1982-03-01), Touchton et al.
patent: 4622516 (1986-11-01), Hearn et al.
Jacob Millman, Microelectronics, 1979, McGraw-Hill Inc., pp. 579-580.

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