Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Patent
1988-03-25
1990-02-27
Heinz, A. J.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
310156, G11B 5016
Patent
active
049051105
ABSTRACT:
An improved spindle motor is provided for rotatably driving one or more memory storage disks in a computer disk drive or the like. The spindle motor comprises a stator shaft having opposite ends anchored to a disk drive housing, and a cylindrical rotor hub supported by bearings from the stator shaft for relatively high speed rotation. The stator shaft carries an armature in magnetically coupled relation with a high strength unitary permanent magnet sleeve carried by the rotor hub, with the number of armature poles and permanent magnet poles being mismatched to achieve low cogging motor operation. The memory disks have central openings therein and are mounted about the rotor hub for rotation during motor operation. Axially elongated resilient shim strips disposed about the rotor hub insure initial disk alignment with their inner diameter edges spaced from direct contact with the rotor hub, thereby permitting the hub and/or disks to accommodate normal thermal gradients during operation without positional shifting of the disks with respect to each other.
REFERENCES:
patent: 4634906 (1987-01-01), Grosjean
patent: 4672253 (1987-06-01), Tajima
patent: 4739427 (1988-04-01), Kilmer
patent: 4754351 (1988-06-01), Wright
patent: 4774428 (1988-09-01), Konecny
patent: 4779165 (1988-10-01), Elsaesser
patent: 4780777 (1988-10-01), Biermeier
Krum Richard G.
Milanes Eddy J.
Moir Michael B.
Heinz A. J.
Magnetic Peripherals Inc.
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