Disk drive spindle motor start up using an additional motor wind

Details Disk drive spindle motor start up using an additional motor wind Disk drive spindle motor start up using an additional motor wind

1995-09-08

1997-07-22

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 75, 318101, G11B 1920

Patent

active

056508867

ABSTRACT:
A disk drive system for use in limited power applications is disclosed. The disk drive includes a spindle motor having two or more windings, along with a spindle motor driver which can drive the spindle motor in any of a unipolar, bipolar or tripolar mode. The bipolar or tripolar mode is used to start the disk drive and then the unipolar mode is used to operate the disk drive while data is being retrieved. By combining the three drive modes a large start current reduction and higher rotation velocities are achieved. Current consumption is further minimized by adaptively transitioning from bipolar to unipolar modes of operation. The disclosure also includes a general methodology for optimal motor K.sub.E and K.sub.M parameter selection.

REFERENCES:
patent: 4458273 (1984-07-01), Johnson
patent: 4755892 (1988-07-01), Carteau et al.
patent: 4970610 (1990-11-01), Knappe
patent: 5134332 (1992-07-01), Nakamura et al.
patent: 5170299 (1992-12-01), Moon
patent: 5210474 (1993-05-01), Oswald
patent: 5225759 (1993-07-01), Endo et al.
patent: 5412809 (1995-05-01), Tam et al.

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