Stepping motor drive control circuit for a magnetic disk drive

Details Stepping motor drive control circuit for a magnetic disk drive Stepping motor drive control circuit for a magnetic disk drive

1989-09-21

1990-11-20

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, 318701, 318671, 360 7804, 360 7813, H02P 800

Patent

active

049721321

ABSTRACT:
A circuit for controllably and finely driving a stepping motor, which moves a magnetic head over a magnetic disk, by using the combination of current values which are individually approximated to a sine wave and a cosine wave. The circuit allows a magnetic head to move at a high speed across the tracks of a magnetic disk toward a desired track, while after such a movement of the head lowering the remaining oscillation frequency of the stepping motor to allow servo to be applied immediately, thereby enhancing rapid operations of the apparatus.

REFERENCES:
patent: 4779033 (1988-10-01), Morita
patent: 4831471 (1989-05-01), Tsujisawa
patent: 4881161 (1989-11-01), Thompson

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