Low profile motor powered disk assembly for a recording/reproduc

Details Low profile motor powered disk assembly for a recording/reproduc Low profile motor powered disk assembly for a recording/reproduc

1994-06-03

1996-06-18

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

360 9807, G11B 1702, G11B 1708

Patent

active

055284361

ABSTRACT:
A low profile memory disk assembly includes a disk spindle motor, which is mounted in a housing, such as a thin, flat memory cassette housing. A hub of the disk spindle motor rotor mounts at least one disk. The hub also has a peripheral surface which mounts a permanent magnet ring. The housing has a recess bounded by thicker housing regions. The recess has a flat base. A salient pole stator for the motor is mounted to the flat base of the recess in a semicircular recess portion of the recess adjacent to the thicker housing sections to be stiffened or reinforced thereby. The motor rotor is journaled to the base within and concentric to the salient pole stator. The peripheral surface of the permanent magnetic ring defines radial gaps with the tips of the radially disposed salient poles of the salient pole stator. Radially magnetized, alternately poled, equally circumferentially spaced, permanent magnet poles in the permanent magnet ring, different in number from the number of salient poles of the salient pole stator, produce permanent magnet fields which interact with the electromagnetic fields of the salient poles to produce rotation of the motor rotor.

REFERENCES:
patent: 4535373 (1985-08-01), Schuh
patent: 4658312 (1987-04-01), Elsasser et al.
patent: 4805054 (1989-02-01), Kamoto et al.
patent: 4990809 (1991-02-01), Artus et al.
patent: 5195002 (1993-03-01), Sakurai
patent: 5251082 (1993-10-01), Elliott et al.
patent: 5296981 (1994-03-01), Ogawa
patent: 5298825 (1994-03-01), Oudet et al.
patent: 5352947 (1994-10-01), MacLeod

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