Seek system for sector servo disk drive

Details Seek system for sector servo disk drive Seek system for sector servo disk drive

1991-06-14

1993-10-19

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

318571, 318626, G05B 1101

Patent

active

052549208

ABSTRACT:
A servo system moving a transducer between tracks in a sector servo disk drive generates a velocity profile representing the variation of the desired velocity of the head in moving from a first track to a second track. The velocity profile has an acceleration phase and deceleration phase, with the transition from acceleration phase to deceleration phase identified as a switch point.
The velocity of movement of the head is periodically sampled from the sector servo pattern in a sequence of sample periods during movement of the head. The energization of the head moving element is controlled so that the switch point occurs during one of the sample periods, thereby resulting in improved performance in positioning the head at the desired track. The system accommodates itself to variations, such as mechanical or electrical disturbances, which would otherwise affect the system.

REFERENCES:
patent: 3749996 (1973-07-01), Pomella et al.
patent: 4009428 (1977-02-01), Sawyer
patent: 4297734 (1981-10-01), Laishley et al.
patent: 4914725 (1990-04-01), Belser et al.
patent: 5004968 (1991-04-01), Mizuno et al.

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