Axial spindle motor for hard disk drive assembly

Details Axial spindle motor for hard disk drive assembly Axial spindle motor for hard disk drive assembly

1996-11-15

1998-03-10

Cao, Allen

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

G11B 1702

Patent

active

057268290

ABSTRACT:
An in-spindle axial-field motor assembly for a disk storage system includes a stationary baseplate and a cover plate secured to the base to form a housing. Disposed about the cover are cylindrical coils which form a motor stator. The motor assembly includes a rotor having inner and outer hubs disposed within the housing. The inner hub is rotatably mounted and supported by a bearing assembly. The outer hub supports an annular, rigid disk which provides a recording medium for storage of information. An axially-magnetized magnet is disposed between the inner and outer hub with the rotor being positioned between the cover and baseplate such that the net axial force acting on the rotor is minimized during motor operation. Ferromagnetic poles are positioned in the center of each coil to enhance the motor's torque generation capability while implementing an axially force-balanced design.

REFERENCES:
patent: 4814652 (1989-03-01), Wright
patent: 4858044 (1989-08-01), Crapo
patent: 5057731 (1991-10-01), Hancock
patent: 5160865 (1992-11-01), Gururangan
patent: 5195002 (1993-03-01), Sakurai
patent: 5396139 (1995-03-01), Surmely et al.

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