Disk drive unit having motor components in a compact arrangement

Details Disk drive unit having motor components in a compact arrangement Disk drive unit having motor components in a compact arrangement

1994-05-26

1995-07-11

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

310156, 360 9908, G11B 5016

Patent

active

054326443

ABSTRACT:
A motor has a stator and a rotor, the stator having cores and drive coils which generate magnetic fields for rotating the rotor. The stator also has a yoke surrounding the rotor and the rotor is positioned such that it is closer to one part of the outer periphery of the yoke than another part of the outer periphery of the yoke. Such a motor is particularly suitable for use in a disk drive unit as a spindle motor for rotating the disk. Then an actuator for moving a head may be located adjacent the part of the outer periphery of the yoke which is closest to the rotor. This permits the head to approach closely the axis of rotation of the disk without the spindle motor interferring with the movement of the head. The continuous yoke prevents magnetic flux leakage from the spindle motor interferring with the actuator. The actuator may itself have a yoke integral with the yoke of the spindle motor, and/or other components in common.

REFERENCES:
patent: 4359763 (1982-11-01), Hoffman
patent: 4581667 (1986-04-01), Gerfast
patent: 4600864 (1986-07-01), Sato
patent: 4620301 (1986-10-01), Koide
patent: 4873596 (1989-10-01), Harada
patent: 4883996 (1989-11-01), Aoki
patent: 5063318 (1991-11-01), Anderson
patent: 5140210 (1992-08-01), Shirakawa

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